Help! I seem to have killed my telly!

[Roger Mills]

I turned on my Pamasonic TX-L26X 10B TV last night and, as often
happens, it reported that new stations had been found. I usually press
Exit at this stage in order to watch the existing channels but, for some
reason, I pressed OK to add the new stations.

This seemed to invoke an automatic tuning operation, where it went
through all the channels starting at 21, and listing what it had found.
All the muxes here are in the 20s and 30s. After 37 it scanned more
radidly until it got to 68. Then the screen went blank, and the green
status light under the screen was flashing quite fast.

After quite a while, I turned it off at the mains and started again -
but still nothing. It just sits there with a blank screen and no sound.
There's an occasional click from an internal relay and a slightly less
dark flash on the screen.

It doesn't respond to any buttons on the remote. I can't get a menu - so
I can't reset it to factory conditions, which is perhaps what it needs.

Anyone got any ideas - other than a trip to the tip?
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.

[Jeff Layman]

Depends on how much you want to bother with a 10+ years old TV. You
could open it up and have a look at the power supply, and perhaps check
for bulging capacitors (not usually a problem with Panasonic). But it it
isn't something simple and obviously fixable. It looks like a trip to
the tip is on the cards.

--

Jeff

[Roger Mills]

You're probably right! But why would a re-tune have caused this?

[Jeff Layman]

It was probably coincidence. Or the power supply chip was on its last
legs, and the stress caused by a retune rewriting the new station
arrangement to memory pushed it over the edge.

--

Jeff

[Brian Gaff (Sofa)]

I don't know that vintage, is this the one with a sat tuner as well?
Does any specialist forums exist for tvs? Back in the days of paper mags,
Television magazine used to have a lot of things about weird faults and how
to fix them, Normally as sets got more modern such fixes were more hold this
down for x seconds then tap this key on the remote then etc etc type things
as bugs always seem to exist in software.

Brian

--

This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
bri...@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"Roger Mills" <watt....@gmail.com> wrote in message
news:in9h3l...@mid.individual.net...

[alan_m]

On 08/08/2021 08:23, Roger Mills wrote:

> Anyone got any ideas - other than a trip to the tip?

Turn it off at the mains switch for more than a couple of minutes before
switching back on. The time will give all the internal power supplies a
chance to fully discharge.


--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

[John Hall]

In message <in9f36...@mid.individual.net>, Roger Mills
<watt....@gmail.com> writes

Do you have a user guide? If so, does it have anything helpful? Might
there perhaps be a button hidden away somewhere on the set for resetting
it to factory conditions?

You could try a web search to see if anyone else has had this problem
and resolved it. There might even be a technical manual available on
Pansonic's site which might help.
--
John Hall "Hard work often pays off after time, but laziness always
pays off now." Anon

[Andy Burns]

John Hall wrote:

> Might there perhaps be a button hidden away somewhere on the set for
> resetting it to factory conditions?

This is for another Panasonic, but might be worth a try

<https://www.hardreset.info/devices/panasonic/panasonic-tx-50cx680/hardreset-second-method/>

Or a different method using buttons on the TV instead of remote

<https://factory-reset.com/wiki/Panasonic_TV_Factory_Reset>

probably worth searching for other panasonic combinations, before taking
it to the skip.

[Paul]

The manual says there are six buttons on the side.

F Volume/Contrast/Brightness/Colour/Sharpness
Tint(NTSCmode)/Bass/Treble/Balance/AutoSetup (page 35)

+/^ Up/down controls for things that
-/v need a slider adjustment

TV \__ Input mode selection
AV /

Power

It's probably not the TV/AV selection, because if there
was no signal on the AV inputs, the OSD would say "No signal"
rather than just bobbling along with various shades of black.

Firmware is loadable via SD, but you'd most likely need
menu sanity for that to kick off.

https://av.jpn.support.panasonic.com/support/global/cs/tv/download/fw/europe/down_eux21.html

"Model Number

LCD model ... TX-L26X10B ...

Update Version Ver. 1.014
Update File Name / Size

P091_1014.zip / 7,535,616 bytes <== "SDDL.SEC" file inside

Update Date Aug 31, 2012"

PDF manual download, is just below the page image.

https://manuall.co.uk/panasonic-tx-l26x10b-viera-lcd-television/

Apparently, if you start the AutoSetup, you're supposed to be
able to stop it, then manually program channels. But that was some
other UK website that had the info.

Summary: I would fiddle with those side buttons, just to get a
menu on it. I don't really know what the best operation to
try on it would be, after that. If you get the menu to
appear, a visual check of the PSU board would not hurt.

Paul

[Andy Burns]

Roger Mills wrote:

> You're probably right! But why would a re-tune have caused this?

Maybe storing the new channels to FLASH memory was the final write that
wore the chip out?

[Theo]

In uk.d-i-y Paul <nos...@needed.invalid> wrote:
> Summary: I would fiddle with those side buttons, just to get a
> menu on it. I don't really know what the best operation to
> try on it would be, after that. If you get the menu to
> appear, a visual check of the PSU board would not hurt.

I'd also try plugging in an HDMI source (eg DVD player) and seeing if it
manages to detect that. That'll allow you to check three things:

- whether it's working enough to detect and display the external source
- possibly wake it up enough to access the menus from where you can select a
factory reset
- whether a fallback plan of using an external STB / PVR / streaming stick
would be feasible if you don't find a way to reset the tuner

Theo

[Java Jive]

On 08/08/2021 09:38, alan_m wrote:
> On 08/08/2021 08:23, Roger Mills wrote:
>
>> Anyone got any ideas - other than a trip to the tip?
>
> Turn it off at the mains switch for more than a couple of minutes before
> switching back on.  The time will give all the internal power supplies a
> chance to fully discharge.

+1, disconnect it from the mains completely for as much as 24hrs or so
before trying again.

--

Fake news kills!

I may be contacted via the contact address given on my website:
www.macfh.co.uk

[Fredxx]

It may have used the microcontroller's own flash memory. I might wonder
if some corruption during the write process caused this.

Some TVs are on eBay for parts. They don't go for a lot with a cracked
screen if you are willing to swap parts.

Otherwise it's either tip or even eBay?

[Roger Mills]

On 08/08/2021 09:38, alan_m wrote:

> On 08/08/2021 08:23, Roger Mills wrote:
>
>> Anyone got any ideas - other than a trip to the tip?
>
> Turn it off at the mains switch for more than a couple of minutes before
> switching back on.  The time will give all the internal power supplies a
> chance to fully discharge.
>
>

I turned it off for several hours when transporting it from A to B.
Still no joy!
--
Cheers,
Roger

[Roger Mills]

I have a user guide (but not a repair manual). The only thing I can find
is via the menu - but I can't display the menu!
--
Cheers,
Roger

[Roger Mills]

Thanks. I've tried all the button combinations in these and similar
articles - but no joy so far.
--
Cheers,
Roger

[SH]

What you describe sounds like:

PSU dried out Capacitors
Back light failure
Backlight protection circuit has kicked in.

S.

[Roger Mills]

Thanks. I'd *love* to get a menu on it, but it won't display *anything*!

I've got the printed manual but, as far as I can see, you need the OSD
in order to apply a firmware update.
--
Cheers,
Roger

[Roger Mills]

I've had an Amazon fire stick connected, but it can't see that. I think
it's more than the tuner because it won't display *anything* - no menu,
no OSD.
--
Cheers,
Roger

[Roger Mills]

On 08/08/2021 12:58, Java Jive wrote:
> On 08/08/2021 09:38, alan_m wrote:
>> On 08/08/2021 08:23, Roger Mills wrote:
>>
>>> Anyone got any ideas - other than a trip to the tip?
>>
>> Turn it off at the mains switch for more than a couple of minutes
>> before switching back on.  The time will give all the internal power
>> supplies a chance to fully discharge.
>
> +1, disconnect it from the mains completely for as much as 24hrs or so
> before trying again.
>

Well yes, there's no harm in doing that. Powering it down for several
hours didn't do anything though. Even longer just *might* I suppose.
--
Cheers,
Roger

[Norman Wells]

First, check the aerial cable works OK with another TV.

Disconnect everything from the failed TV apart from the mains lead and
the aerial cable which should go directly to it and not loop through
anything else like a video recorder.

With the TV turned on, are there any visible lights to show the power is
getting through?

Does the screen get brighter (or less dark) if you manually increase the
brightness to max on the TV? That should indicate whether the backlight
is working. Leave the remote out of it.

Is your remote control actually working? Either replace the batteries
with new, or point it at a digital camera when it should show up when
pressed in the camera viewing screen.

Does the manual indicate any way of resetting the TV manually using its
own controls? Sometimes keeping the on/off button depressed for a few
seconds does that. Otherwise, this may give you a steer:

http://eng-ca.faq.panasonic.com/app/answers/detail/a_id/20638/~/how-to-reset-the-tv-to-the-factory-default-settings.

[Paul]

Time to look at the power board, for leaking caps.

Especially with the sound of a relay clicking.

Sometimes you can find a Service Manual. Example of a
Panasonic, here. Just not the OPs one.

https://www.manualslib.com/manual/991120/Panasonic-Tx-L32s10b.html?page=9#manual

I wouldn't know where to start. There are only a few components
there suited to leak-checking. I was expecting to see more
electrolytics on it.

Paul

[Rod Speed]

Norman Wells <h...@unseen.ac.am> wrote

It wont be that that’s stopping the OSD.

> Disconnect everything from the failed TV apart from the mains lead and the
> aerial cable which should go directly to it and not loop through anything
> else like a video recorder.

You don’t need any aerial cable to get an OSD.

> With the TV turned on, are there any visible lights to show the power is
> getting through?

> Does the screen get brighter (or less dark) if you manually increase the
> brightness to max on the TV? That should indicate whether the backlight
> is working. Leave the remote out of it.

> Is your remote control actually working?

You should be able to get an OSD without any remote.

[Theo]

In uk.d-i-y Paul <nos...@needed.invalid> wrote:

> Time to look at the power board, for leaking caps.

https://www.ebay.co.uk/itm/224278672631

Although the whole telly is on sale for £30, so may not be worth investing
very much.

> Sometimes you can find a Service Manual. Example of a
> Panasonic, here. Just not the OPs one.

Here's the service manual PDF (no need to speak Russian):
https://tel-spb.ru/files/Panasonic_TX-L26X10B_GLP24.rar

which has a 'Power LED blinking timing chart' which should indicate what's
wrong.

Theo

[Woody]

The answer is simple - as already commented - the backlight has failed.
The easiest test is to get in the room in the dark at night with no
other lighting present and switch it on. If the backlight <is> working
you will still see a change in the screen brightness just after the
front panel LED stops flashing even though it is black. You should also
be able to see the effect/source of the backlighting if you get close to
the TV and look across the screen at one edge from the opposite edge -
there will be a slight glow on one edge if the backlighting is working
so you need to look at all four edges.
Per the relay clicking, with a Panny (I have one behind me as I type)
you know of course that the remote power button has to be held for a
second or two to power on - at which point the LED changes from flashing
red to flashing green coincident with a single relay click just before
the colour change.
We had a Samsung in our lounge that was my late fil's set vintage about
2006 and he died in Jan 2019. I was watching it one night, changed
channel and the screen went blank. I too went through every check I
could think of but couldn't get anything to work so wrote it down to
experience and binned it.
One thing I do notice: the HD ready panel on the Panny (also 15+ years
old) is significantly better then either of the two Samsungs that we now
have one of which is full HD.

[David Woolley]

On 09/08/2021 08:31, Woody wrote:
> Per the relay clicking, with a Panny (I have one behind me as I type)

A 26 inch will almost certainly be brand engineered, not a Panasonic
design. I think the Viera, in the service manual name quoted,
represents the real manufacturer.

[Peeler]

On Mon, 9 Aug 2021 08:59:18 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

<FLUSH the trolling senile asshole's latest trollshit unread>

--
Sqwertz to Rodent Speed:
"This is just a hunch, but I'm betting you're kinda an argumentative
asshole.
MID: <ev1p6ml7ywd5$.d...@sqwertz.com>

[charles]

In article <seqpm2$pga$1...@dont-email.me>,

Viera is Panasonic's name for its interconnection with externals

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle

[David Woolley]

On 09/08/2021 10:19, charles wrote:
>> A 26 inch will almost certainly be brand engineered, not a Panasonic
>> design. I think the Viera, in the service manual name quoted,
>> represents the real manufacturer.

> Viera is Panasonic's name for its interconnection with externals

The name I was trying to remember was Vestel.

[Theo]

Viera is Panasonic's TV brand, like 'Sony Trinitron' back in the day.

Looking at the schematic I posted, the parts look solidly Japanese. The main
controller IC is a Panasonic (GenX8). So in this case it seems to be a
Panasonic original.

Theo

[Roger Mills]

On 09/08/2021 08:31, Woody wrote:

I haven't looked at it in total darkness, but there's *some* light on
the screen. There is sometimes a lighter black flicker, often associated
with a relay click.

I'm aware, of course, that - when it's working normally - you need to
hold down the ON button on the remote until the light goes to flashing
green and then solid green. But the odd thing under this fault condition
is that, when I turn it on with the switch on the side of the set, the
red standby light comes on for a few seconds and then starts flashing
green without me touching the remote. It then doesn't respond to
*anything* on the remote so I can't turn it back to standby. [I'm
satisfied that the remote is working because I can see red flashes when
pointing my phone camera at it].
--
Cheers,
Roger

[Brian Gaff (Sofa)]

As ibn Virgins? As fare as I know most makers use off the shelf bits, but
since Panasonic recent designs all have talking software, I suspect that
this must be developed in house.
Brian

--

This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...
bri...@blueyonder.co.uk
Blind user, so no pictures please
Note this Signature is meaningless.!
"David Woolley" <da...@ex.djwhome.demon.invalid> wrote in message
news:seqsjs$kl7$1...@dont-email.me...

[Dave]

On 09/08/2021 13:53, Roger Mills wrote:

> I'm aware, of course, that - when it's working normally - you need to
> hold down the ON button on the remote until the light goes to flashing
> green and then solid green. But the odd thing under this fault condition
> is that, when I turn it on with the switch on the side of the set, the
> red standby light comes on for a few seconds and then starts flashing
> green without me touching the remote. It then doesn't respond to
> *anything* on the remote so I can't turn it back to standby. [I'm
> satisfied that the remote is working because I can see red flashes when
> pointing my phone camera at it].

Searching for "panasonic tv flashing green led" brings up lots of
information, some more useful than others. Some claim that there is a
code in the number of flashes from the power LED that will help to
diagnose the problem.
--
Dave

[Tony Gamble]

On 09/08/2021 14:52, Dave wrote:
> panasonic tv flashing green led

That was a good suggestion Dave.

Near the top was this:-
https://www.avforums.com/threads/panasonic-plasma-just-a-green-light.2083436/

Lots of things to try there.

[Woody]

....except that this TV is LCD?

[Roger Mills]

Indeed. But holding V- and pressing 0 (zero) on the remote 3 times
*does* do something.

It brings up a line of text on the screen saying "Start Adjustment Menu"
- whatever that means. I can't then get it to do anything else but at
least the screen can't be entirely dead.

--
Cheers,
Roger

[The Natural Philosopher]

On 08/08/2021 08:23, Roger Mills wrote:
> I turned on my Pamasonic TX-L26X 10B TV last night and, as often
> happens, it reported that new stations had been found. I usually press
> Exit at this stage in order to watch the existing channels but, for some
> reason, I pressed OK to add the new stations.
>
> This seemed to invoke an automatic tuning operation, where it went
> through all the channels starting at 21, and listing what it had found.
> All the muxes here are in the 20s and 30s. After 37 it scanned more
> radidly until it got to 68. Then the screen went blank, and the green
> status light under the screen was flashing quite fast.
>
> After quite a while, I turned it off at the mains and started again -
> but still nothing. It just sits there with a blank screen and no sound.
> There's an occasional click from an internal relay and a slightly less
> dark flash on the screen.
>
> It doesn't respond to any buttons on the remote. I can't get a menu - so
> I can't reset it to factory conditions, which is perhaps what it needs.
>
> Anyone got any ideas - other than a trip to the tip?

I had one did something like that from new. got it replaced. Is it in
warranty?


--
There is nothing a fleet of dispatchable nuclear power plants cannot do
that cannot be done worse and more expensively and with higher carbon
emissions and more adverse environmental impact by adding intermittent
renewable energy.

[billy bookcase]

"Roger Mills" <watt....@gmail.com> wrote in message
news:in9f36...@mid.individual.net...

>
> It doesn't respond to any buttons on the remote. I can't get a menu - so I can't reset
> it to factory conditions, which is perhaps what it needs.

While this wouldn't explain why the TV would halt mid task, have you considered
the possibility there is a fault with the remote ?

" Strangely, my remote stopped working today as well. Mine was just unresponsive all
of a sudden. I looked online, and the solution I found was to take the batteries out,
hold
down the power button on the remote for over a minute, then push lots of remote, just
loads of them one after another for a while, and then put the batteries back in. It
sounds
crazy and simple, and I was sure it wouldn't work, but it did. I think the 'science'
behind it
involves depleting it of charge, so it can reset itself. Try that! Its worth a shot."

https://www.avforums.com/threads/panasonic-tv-remote-not-working.2312473/

bb

[Tony Gamble]

>
> It brings up a line of text on the screen saying "Start Adjustment Menu"
> - whatever that means. I can't then get it to do anything else but at
> least the screen can't be entirely dead.
>

That sounds optimistic.

I have not been through the whole of this thread but have you googled
for a service manual. I know this is not the precise model that you own
but it may offer some starter suggestions.

https://www.manualslib.com/manual/1905110/Panasonic-Tx-40ds500b.html?page=2#manual

It did refer to the keys you used on your remote so it might not be too
different for the next step.

[John Rumm]

On 09/08/2021 08:31, Woody wrote:

That does not really seem to fit the evidence though...

Roger mentioned that he could see a change in the screen brightness.

Also there is no audio. If it were just a backlight failure, you might
expect other TV functions to still work, and you would possibly be able
to still see an image on screen when you shine a bright torch on it.

IME Traditional LCDs with CFL backlight will normally keep running even
if the inverter driving the backlight has failed. (More modern LED
backlit ones will often cause the PSU to shutdown altogether if one of
the backlight LEDs fails short).

I too suspect the PSU board is the first thing to investigate. Quite
often the output connector will have a silkscreen on the board with the
expected voltages, so that can be an easy test.

Testing for ~700V on the output of the backlight inverter is also
possible, but from the description it sounds like that is probably
working ok.



--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/

[Roger Mills]

On 10/08/2021 00:54, The Natural Philosopher wrote:
> On 08/08/2021 08:23, Roger Mills wrote:
>> I turned on my Pamasonic TX-L26X 10B TV last night and, as often
>> happens, it reported that new stations had been found. I usually press
>> Exit at this stage in order to watch the existing channels but, for
>> some reason, I pressed OK to add the new stations.
>>
>> This seemed to invoke an automatic tuning operation, where it went
>> through all the channels starting at 21, and listing what it had
>> found. All the muxes here are in the 20s and 30s. After 37 it scanned
>> more radidly until it got to 68. Then the screen went blank, and the
>> green status light under the screen was flashing quite fast.
>>
>> After quite a while, I turned it off at the mains and started again -
>> but still nothing. It just sits there with a blank screen and no
>> sound. There's an occasional click from an internal relay and a
>> slightly less dark flash on the screen.
>>
>> It doesn't respond to any buttons on the remote. I can't get a menu -
>> so I can't reset it to factory conditions, which is perhaps what it
>> needs.
>>
>> Anyone got any ideas - other than a trip to the tip?
>
> I had one did something like that from new. got it replaced. Is it in
> warranty?
>
>

No - it's 11 years old!

--
Cheers,
Roger

[Roger Mills]

Thanks for the suggestion, but I'm pretty sure it's not that. I can see
that the remote is sending something by pointing it at my phone's camera.

But when the set is stitched on, the power light goes from red to
flashing green without using the remote. It shouldn't do that!
--
Cheers,
Roger

[Roger Mills]

Yes, I've downloaded the correct service manual - but it seems to assume
that the OSD is working - which it ain't, apart from this single line of
text "Start Adjustment Menu"
--
Cheers,
Roger

[charles]

In article <0YqdnWvNJcVvpo_8...@brightview.co.uk>,
John Rumm <see.my.s...@nowhere.null> wrote:

[Snip]

> That does not really seem to fit the evidence though...

> Roger mentioned that he could see a change in the screen brightness.

> Also there is no audio. If it were just a backlight failure, you might
> expect other TV functions to still work, and you would possibly be able
> to still see an image on screen when you shine a bright torch on it.

> IME Traditional LCDs with CFL backlight will normally keep running even
> if the inverter driving the backlight has failed. (More modern LED
> backlit ones will often cause the PSU to shutdown altogether if one of
> the backlight LEDs fails short).

> I too suspect the PSU board is the first thing to investigate

In the absense of any obvious other thing, the Power Supply is always the
first thing to check. A lesson from over 50 years ago - and it's stood me
in good stead.

[Ian Jackson]

In message <ineueq...@mid.individual.net>, Roger Mills
<watt....@gmail.com> writes

Does the set have a usable video output - something that could be looked
at (by whatever means) on something external?
--
Ian

[R D S]

On 08/08/2021 08:23, Roger Mills wrote:
> Anyone got any ideas - other than a trip to the tip?

I like our albeit humble telly so when it went bang I took a board out
and sent it to a guy on ebay, paid about 30 quid and it's been fine
since. If you're interested i'll look at my history and see where it went.

[Jeff Layman]

Anything here of use:
<https://www.avforums.com/threads/panasonics-usage-hours.2108058/#post-28237633>

Or here:
<http://www.hdtv.com.pl/forum/panasonic/108631-vt60-menu-serwisowe-problem.html?__cf_chl_managed_tk__=pmd_2a2969d48ec4c5f35411d0e0599725c559156d6c-1628590283-0-gqNtZGzNAzijcnBszQMO>
(You will need to get through a Captcha, and need Google Translate for
anything other than the first post in the thread).

--

Jeff

[R. Mark Clayton]

Mine is a Toshiba, it does do that, then the light goes solid green and it starts. Despite software updates, the set still gets stuck from time to time with a blank screen and the green light flashing, resolved by power cycling.

[Roger Mills]

On 10/08/2021 11:14, Jeff Layman wrote:
> On 09/08/2021 23:48, Roger Mills wrote:
>> On 09/08/2021 18:32, Woody wrote:
>>> On Mon 09/08/2021 17:44, Tony Gamble wrote:
>>>> On 09/08/2021 14:52, Dave wrote:
>>>>> panasonic tv flashing green led
>>>>
>>>> That was a good suggestion Dave.
>>>>
>>>> Near the top was this:-
>>>> https://www.avforums.com/threads/panasonic-plasma-just-a-green-light.2083436/
>>>>
>>>>
>>>>
>>>> Lots of things to try there.
>>>>
>>>>
>>>>
>>>
>>> ....except that this TV is LCD?
>>
>> Indeed. But holding V- and pressing 0 (zero) on the remote 3 times
>> *does* do something.
>>
>> It brings up a line of text on the screen saying "Start Adjustment Menu"
>> - whatever that means. I can't then get it to do anything else but at
>> least the screen can't be entirely dead.
>
> Anything here of use:
> <https://www.avforums.com/threads/panasonics-usage-hours.2108058/#post-28237633>
>

'Fraid not. When the Start Adjustment Menu disappears, the screen goes
black rather than grey, and doesn't respond to 2 or mute being pressed.

>
> Or here:
> <http://www.hdtv.com.pl/forum/panasonic/108631-vt60-menu-serwisowe-problem.html?__cf_chl_managed_tk__=pmd_2a2969d48ec4c5f35411d0e0599725c559156d6c-1628590283-0-gqNtZGzNAzijcnBszQMO>
>
> (You will need to get through a Captcha, and need Google Translate for
> anything other than the first post in the thread).
>

Sadly no. That seems to be for a plasma set anyway, but I can't get any
actual menu to appear after the Start Adjustment Menu heading.
--
Cheers,
Roger

[Roger Mills]

Do you mean via Scart or HDMI etc.? It does potentially have these but I
wouldn't expect to see anything on them because it hasn't properly got
past the power on stage.
--
Cheers,
Roger

[David Woolley]

On 10/08/2021 11:46, R. Mark Clayton wrote:
> Mine is a Toshiba, it does do that, then the light goes solid green and it starts. Despite software updates, the set still gets stuck from time to time with a blank screen and the green light flashing, resolved by power cycling.

Same for my Toshiba branded Vestel.

(Maybe it it is something to do with global warming as the weather app
reports hypersonic winds and extreme barometric pressures :-).)

[Ian Jackson]

In message <inf5le...@mid.individual.net>, Roger Mills

<watt....@gmail.com> writes
>On 10/08/2021 10:49, Ian Jackson wrote:
>> In message <ineueq...@mid.individual.net>, Roger Mills
>><watt....@gmail.com> writes
>>> On 10/08/2021 09:13, Tony Gamble wrote:
>>>>
>>>>>
>>>>> It brings up a line of text on the screen saying "Start Adjustment
>>>>>Menu" - whatever that means. I can't then get it to do anything
>>>>>else but at least the screen can't be entirely dead.
>>>>>
>>>>  That sounds optimistic.
>>>>  I have not been through the whole of this thread but have you
>>>>googled  for a service manual. I know this is not the precise model
>>>>that you own  but it may offer some starter suggestions.
>>>>
>>>> https://www.manualslib.com/manual/1905110/Panasonic-Tx-40ds500b.html?pa
>>>> ge=2#manual    It did refer to the keys you used on your remote so
>>>>it might not be too  different for the next step.
>>>
>>> Yes, I've downloaded the correct service manual - but it seems to
>>>assume that the OSD is working - which it ain't, apart from this
>>>single line of text "Start Adjustment Menu"
>> Does the set have a usable video output - something that could be
>>looked at (by whatever means) on something external?
>
>Do you mean via Scart or HDMI etc.?

Anything you could use.

> It does potentially have these but I wouldn't expect to see anything
>on them because it hasn't properly got past the power on stage.

It was just a suggestion in case the set WAS actually working, but not
displaying on its own screen.
--
Ian

[Roger Mills]

I've lost count of how many times I've power cycled mine - all to no avail!
--
Cheers,
Roger

[Roger Mills]

No I'm pretty sure it's not. There's no sound, either.
--
Cheers,
Roger

[Paul]

I tried a Google on the string, with quotes...

This item is for a plasma set, so should not be used
for an LCD exactly.

http://www.controlcal.com/forum/showthread.php?t=1006

"
"Start Adjustment Menu" message will be displayed
followed by the Service Menu after few seconds.

You should see this as your display:

ADJUST {Picture Adjustment}
WB-ADJUST {White Balance Adjustment}
OPTION {Option Setting}
V-SUS {V-SUS Adjustment}
AGING
SRV-TOOL {Service Tool}
"1" & "2" buttons move through options
"

That appears to be the entry point of the Service Menu.
If a person was servicing the set (TV Repair), then
they would attempt to get there. Your service menu
is not rendering to screen.

There is a second reference here. Last post.

https://www.hifivision.com/threads/solution-to-find-out-panasonic-lcd-usage-hours.32728/

"You have to keep the {Channel -} button on the TV panel and
keep it pressed (do not release). While the above button is
pressed, press {INFO} button 3 times. <=== [Info button on Remote?]

At this point {Channel -} can be released."

[And press Exit to come out of Service Menu]

Another example here, of a Service Menu.

https://lcd-television-repair.com/newsletter/Panasonic_TV_Service_Menu.html

So far, no suggestions for why the Service Menu won't paint.

Paul

[Theo]

In uk.d-i-y Roger Mills <watt....@gmail.com> wrote:
> Indeed. But holding V- and pressing 0 (zero) on the remote 3 times
> *does* do something.
>
> It brings up a line of text on the screen saying "Start Adjustment Menu"
> - whatever that means. I can't then get it to do anything else but at
> least the screen can't be entirely dead.

Service mode is operated through the number keys:

Press the 3/4 button to change the adjustment values or function.
Press the 1/2 button to step up/down through the functions and adjustments
Press the numerical button VOLUME (+/-) to change option item.
Press the OK button after each adjustment has been made to store the
required values.



Does this work:

Self Check
Self-check is used to automatically check the bus lines and hexadecimal code
of the TV set. To enter Self-Check mode, keep
pressing the down (-/v) button on the TV set and press the STATUS [i]
button on the remote control. To exit Self Check,
switch off the TV set at the power button.


and you should check the power LED blinking sequence:

Power LED blinking timing chart
1. Subject
Information of LED Flashing timing chart.
2. Contents
When abnormality has occurred the unit, the protection circuit operates and
reset to the stand by mode. At this time, the defective block can be
identified by number of blinking of the Power LED on the front panel of the
unit.

It flashes the LED N times, and then goes off, then N flashes, etc. How
many flashes are there? All point to the main board except where noted:

1=INVERTER_SOS (inverter board)
2=FAN_SOS
3=SOS
4=SUB_F_12V
5=MAIN9V
6=SUB5V (remote receiver board)
7=SUB3.3V
8=MAIN3.3V
9=SOUND_SOS
10=EMERGENCY_SOS

Theo

[Roger Mills]

On 10/08/2021 15:08, Theo wrote:
> In uk.d-i-y Roger Mills <watt....@gmail.com> wrote:
>> Indeed. But holding V- and pressing 0 (zero) on the remote 3 times
>> *does* do something.
>>
>> It brings up a line of text on the screen saying "Start Adjustment Menu"
>> - whatever that means. I can't then get it to do anything else but at
>> least the screen can't be entirely dead.
>
> Service mode is operated through the number keys:
>
> Press the 3/4 button to change the adjustment values or function.
> Press the 1/2 button to step up/down through the functions and adjustments
> Press the numerical button VOLUME (+/-) to change option item.
> Press the OK button after each adjustment has been made to store the
> required values.
>

That presupposes that some options are displayed - they aint!

>
>
> Does this work:
>
> Self Check
> Self-check is used to automatically check the bus lines and hexadecimal code
> of the TV set. To enter Self-Check mode, keep
> pressing the down (-/v) button on the TV set and press the STATUS [i]
> button on the remote control. To exit Self Check,
> switch off the TV set at the power button.
>
>

Ditto, can't get there either.

> and you should check the power LED blinking sequence:
>
> Power LED blinking timing chart
> 1. Subject
> Information of LED Flashing timing chart.
> 2. Contents
> When abnormality has occurred the unit, the protection circuit operates and
> reset to the stand by mode. At this time, the defective block can be
> identified by number of blinking of the Power LED on the front panel of the
> unit.
>
> It flashes the LED N times, and then goes off, then N flashes, etc. How
> many flashes are there? All point to the main board except where noted:
>
> 1=INVERTER_SOS (inverter board)
> 2=FAN_SOS
> 3=SOS
> 4=SUB_F_12V
> 5=MAIN9V
> 6=SUB5V (remote receiver board)
> 7=SUB3.3V
> 8=MAIN3.3V
> 9=SOUND_SOS
> 10=EMERGENCY_SOS
>
> Theo
>

The light flashes continuously quite fast, with no pauses. I assume that
means EMERGENCY_SOS - whatever that is!

Incidentally, on P10 of the service manual there is a table of voltages
to check on the A-board. Each one is referenced by a TP No. such as
TP2765. But I can't see anything that obviously looks like test points,
and most of the text on the board is too small to read. How do I find
these points?
--
Cheers,
Roger

[Roger Mills]

No, sadly, I can't get anything other than the heading. I'm not sure how
useful it would be to know the total running time and number of starts.
Although it's 11 years old it hasn't been used very much. It was at my
holiday flat, which is occupied 25% of the time at the most. [I've now
got it back at my main home to try to fix it].
--
Cheers,
Roger

[Brian Gregory]

On 10/08/2021 15:51, Roger Mills wrote:
> No, sadly, I can't get anything other than the heading. I'm not sure how
> useful it would be to know the total running time and number of starts.
> Although it's 11 years old it hasn't been used very much. It was at my
> holiday flat, which is occupied 25% of the time at the most. [I've now
> got it back at my main home to try to fix it].

The service menu may also be where you calibrate the colour response of
the screen. So you don't really want to randomly mess with bits of it
you don't understand if you ever get it to appear.

--
Brian Gregory (in England).

[Roger Mills]

Agreed!
--
Cheers,
Roger

[John Rumm]

If you can find a model number of the board, you could try searching for
that along with "board view". There may be a PDF layout of the board, or
even a proper board view file designed to be loaded into board view
software.

Failing that, a big illuminated magnifier!

[Theo]

In uk.d-i-y Roger Mills <watt....@gmail.com> wrote:
> On 10/08/2021 15:08, Theo wrote:
> The light flashes continuously quite fast, with no pauses. I assume that
> means EMERGENCY_SOS - whatever that is!

Not sure - EMERGENCY_SOS is down as 13 flashes (not 10) rather than a
continuous flash.

> Incidentally, on P10 of the service manual there is a table of voltages
> to check on the A-board. Each one is referenced by a TP No. such as
> TP2765. But I can't see anything that obviously looks like test points,
> and most of the text on the board is too small to read. How do I find
> these points?

You might have to trace them from the nearest IC that is labelled. For
example TP5405 (SUB5V) is from pin 3 of IC5405, which the Conductor Views
section shows labelled in quadrant 1D of the A-board.

Theo

[%%]

Roger Mills <watt....@gmail.com> wrote

Take a photo of the board and blow it up.

[Peeler]

On Wed, 11 Aug 2021 08:11:39 +1000, %%, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:

<FLUSH the abnormal trolling senile cretin's latest trollshit unread>

--
Website (from 2007) dedicated to the 87-year-old senile Australian
cretin's pathological trolling:
https://www.pcreview.co.uk/threads/rod-speed-faq.2973853/

[SH]

That will certainly render it beyound all feasible repair........

[John Hall]

In message <sevv7a$165i$2...@gioia.aioe.org>, SH <i.lov...@spam.com>
writes

>On 10/08/2021 23:11, %% wrote:
>> Take a photo of the board and blow it up.
>
>That will certainly render it beyound all feasible repair........

LOL!
--
John Hall "Hard work often pays off after time, but laziness always
pays off now." Anon

[Roger Mills]

> That will certainly render it beyond all feasible repair........

I've now found all but one of the testpoints (without any explosions!)
and will tabulate the results below. They're not marked on the board,
but they are shown on a schematic in the repair manual, so I was able to
reference them to specific pins of connectors.

Not sure how this will tabulate, but what I found was:

Description Expected Value Measured value
5VS 5.6v +/- 0.25v 5.72v
SUB_TNR_6V 5.6v +/- 0.25v 5.72v
GND 0 0.1mv
INVERTER_SOS 0 78mv
P17V 17v +/- 1v 18.35v
SUB_F_12V 12v +/- 1v 11.98v
INV_ON 2.85v +/- 2% 3.20v

The one I can't find is TV_SOS (which may possibly be the most
significant one). It only seems to be on a pin of IC5480, which is on
the *underside* of the board and not accessible with the board in place.

Any comments on these voltages?
--
Cheers,
Roger

[The Natural Philosopher]

On 11/08/2021 10:42, Roger Mills wrote:
> escription    Expected Value        Measured value
> 5VS        5.6v ± 0.25v        5.72v
> SUB_TNR_6V    5.6v ± 0.25v        5.72v

> GND        0            0.1mv
> INVERTER_SOS    0            78mv

> P17V        17v ± 1v        18.35v
> SUB_F_12V    12v ± 1v        11.98v
> INV_ON        2.85v ± 2%        3.20v

>
> The one I can't find is TV_SOS (which may possibly be the most
> significant one). It only seems to be on a pin of IC5480, which is on
> the *underside* of the board and not accessible with the board in place.
>
> Any comments on these voltages?

It looks to me like something isn't drawing any current when it should
be hence the high 17V. and the INV_ON is surely wrong.

One possible approach is to change every single electrolytic capacitor
in the vicinity of the power supply.

(I have memories as a trained electronic engineer of being highly
impressed as to how totally unskilled girls were repairing blown audio
power amplifiers. They removed *all* the power transistor and power
resistors and replaced them. These were placed in a bin and then tested
by a technician on a transistor tester - good ones went back to the
repair line as spares. Any boards that didn't work were placed in a box
for the technician to diagnose)

--
I would rather have questions that cannot be answered...
...than to have answers that cannot be questioned

Richard Feynman