Sony Bravia solarized image

[Miguel Giménez]

I'm repairing a friend's Sony Bravia (KDL-37V5500). The first minute
after powering up the image is OK, but after the first minute the image
gets solarized (whites go saturated, some parts become yellow, there is
a faint red border around bright parts).

The power supply and the backlight look OK, so I suspected about the
T-CON and used freeze spray over it. No changes until the local power
supply IC (ROHM BD8160EFV) died in short.

A new IC is on the way, but I have two questions:
- Where is the original fault?
- Is freeze spray so dangerous (it goes to -19 ºC, and the IC is
specified to -40 ºC)?. I have used it many times without damages.

TIA

--
Saludos
Miguel Giménez

[Rob]

Miguel Giménez <m...@privacy.net> wrote:
> - Is freeze spray so dangerous (it goes to -19 ºC, and the IC is
> specified to -40 ºC)?. I have used it many times without damages.

Freeze spray can cause condensation of water, and may cause conductive
paths to appear where they previously weren't (like when getting water
damage in your laptop or phone).

That can blow up things, yes.

Freezing a powersupply IC or circuit is also dangerous in that it may
cause the voltage to shift, and thus the powered circuits to be
blown up.

[ohg...@gmail.com]

Your original fault is most like the AS15 IC. There are several variants and some of them are all plastic while some have a metal belly pan for ground and heatsink. If yours has the belly pan, you must use hot air to get it out. What I do is put chipquik on the IC, if it floats off the board, replace with a plastic version. If it won't budge, break out the hot air to flow the solder under the chip. Replace with a metal back version.

As to why the other IC failed, are you sure it shorted? If the AS chip shorts, it will put the power converter IC into shutdown. Try removing the AS15 and see if the power IC outputs properly with no load.

[Miguel Giménez]

Thank you both for your answers.

I have a SMT air station for chip removal, and the IC has a bottom pad
for heat sinking. I will desolder it when the replacement arrive.
Soldering the bottom pad will be difficult, though.

The BD8160 has the inner boost FET shorted (pins 4 and 5 are shorted to
ground), so the 12 V input is shorted to ground through the boost coil.
There is a 1206 fuse, but it is OK.

The AS15 is after the boost diode and a series MOSFET switch, so I know
the short is not in it (I have the T-CON schematic). If the board comes
back to life I will check the AS15, it is easy to test because it is
just an array of analog buffers.

--
Saludos
Miguel Giménez

[ohg...@gmail.com]

A trick to remove the original AS15 is to *carefully* grind down the expoxy on top of the chip to expose the internal die. I use a Dremel with a small stone wheel. With the die exposed, it's much easier to melt the solder under the IC from the top with hot air. I use solder paste with lead (still available) to install the new chip and it has a lower melting point than the original solder, so installing it will take less heat/time than if you used lead-free.

You have a schematic for the TCON??? Wow, it's nearly impossible around here to get a schematic much less a block diagram.

[Miguel Giménez]

El 13/08/2021 a las 19:49, ohg...@gmail.com escribió:
> You have a schematic for the TCON???

Yes. The TV set is Sony, but this particular TCON is made by Samsung,
and the schematic was easy to find (IIRC it is from Elektrotanya)

--
Saludos
Miguel Giménez

[ohg...@gmail.com]

Sony never made an LCD screen for TVs as far as I've ever seen. Since the TCONs are shipped with the display, they would match the vendor for the display screen.

As far as schematics or datasheets, I've had some luck on Russian websites where they didn't seem available on the web, Elektrotanya included.. Just run a page through Google Translate.

Also, for reasons I don't understand, I find that sometimes Elektrotanya's own search will return nothing, but if I use the Google Advanced Search and put Elektrotanya's web address in the site box and then put in my search parameters, I can often find a manual there.

[Jeff Liebermann]

On Tue, 17 Aug 2021 06:48:18 -0700 (PDT), "ohg...@gmail.com"
<ohg...@gmail.com> wrote:

>Sony never made an LCD screen for TVs as far as I've ever seen.

True. Not for consumer TV's. The Sony, Hitachi and Toshiba LCD panel
divisions, were merged into Japan Display in 2011:
<https://www.j-display.com/english/>
The industrical displays are sold under the KOE name:
<http://www.koe.j-display.com>
<http://www.koe.j-display.com/index.php?option=newproduct&task=showpage&id=43>
Japan Display makes smartphone, tablet, laptop and medical LCD
displays but no consumer TV displays.

--
Jeff Liebermann je...@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558

[Chris K-Man]

________

I have an interesting question for all of you:

What do you think of the quality/characteristics of the picture
you see on new TVs on display in stores?

[None]

On Sun, 22 Aug 2021 04:12:34 -0700, Theckmah Dumbfuck < thekma @
shortbus.edu > drooled:

> I have an interesting question for all of you:

Your obsession with in-store displays, and your absurd fantasy that you
know something about video calibration, are only "interesting" to you and
other retards.

> What do you think of the quality/characteristics of the picture
> you see on new TVs on display in stores?

Theckmah rides his hobby horse. He's hoping someone will agree with his
retarded gibbering. He's been laughed out of other froups, and outright
banned from most moderated forums he's posted to, for being a drooling
moron with his bizarre obsessions. What a fucking shit-for-brains (and
that's an inuslt to shit).

[Peter W.]

None: One more idiot in search of a village.

Peter Wieck
Melrose Park, PA

[ohg...@gmail.com]

They're cartoonishly inaccurate - but intentionally so. When there are 50 displays on the wall all running at the same time, the one with most bizarre colors and brightness is the one most people will pick as the best picture.

When setting up a new TV for home, most have a "home" or "store" or "demo" option. The home setting sets the LED array brightness to 100% by default. The store or demo mode sets it for 110 plus percent for the same reason.

I remember the time my softball team was at a bar after a game, and they had a Sharp Aquos 60" in default settings. The grass on the infield of the game we were watching that was on was a weird fluorescent green, the blacks were dark blue, and it was overly bright. One of the guys was impressed with that mess of a picture and asked if I could adjust his Sony to look like that. I said I could try, but wasn't sure if I could get his Sony to look that bad on purpose. He of course was shocked but when I asked if he ever saw grass that color, the light went off.

[Chris K-Man]

_______

Good call - with the grass that is!

So how can I, among many people, help turn the tide against public
acceptance of such a garish factory image - be it Home or Store mode?

I would estimate, since the mid-2000s, that millions of consumers
automatically associate such overblown settings with HD and or 4K.
How to educate them otherwise?

[None]

On Wed, 25 Aug 2021 12:09:38 -0700, thekma # shortbus.edu

> Good call -
Someone finally bit at your troll bait. You must be so prou

> So how can I, among many people, help turn the tide against
> public acceptance of such a garish factory image - be it Home or
> Store mode?

Maybe by obsessive trolling on Usenet, getting maybe a single hit every
three or four years? That's not a smart way to achieve your goal, but
you're not a very smart retard.

> How to educate them otherwise?

Definitely by ko0k-dansing on a usenet hobby horse. Yeah, that's the
ticket! That's the way to reach the masses! At least usenet trolling won't
get you kicked out of restaurants and TV stores for being an obsessive
douche bag.

[ohg...@gmail.com]

Dude, you need help, and I mean bad. The best advice would be to just let your hate go. Not only is that guy living rent free in your head, he's using your utilities at no charge. I'm serious. The only reaction you're getting with your trolling rants is either laughter or pity. Think about it

[ohg...@gmail.com]

On Wednesday, August 25, 2021 at 3:09:41 PM UTC-4, Chris K-Man wrote:

> > >
> > > I have an interesting question for all of you:
> > >
> > > What do you think of the quality/characteristics of the picture
> > > you see on new TVs on display in stores?
> > They're cartoonishly inaccurate - but intentionally so. When there are 50 displays on the wall all running at the same time, the one with most bizarre colors and brightness is the one most people will pick as the best picture.
> >
> > When setting up a new TV for home, most have a "home" or "store" or "demo" option. The home setting sets the LED array brightness to 100% by default. The store or demo mode sets it for 110 plus percent for the same reason.
> >
> > I remember the time my softball team was at a bar after a game, and they had a Sharp Aquos 60" in default settings. The grass on the infield of the game we were watching that was on was a weird fluorescent green, the blacks were dark blue, and it was overly bright. One of the guys was impressed with that mess of a picture and asked if I could adjust his Sony to look like that. I said I could try, but wasn't sure if I could get his Sony to look that bad on purpose. He of course was shocked but when I asked if he ever saw grass that color, the light went off.
> _______
>
> Good call - with the grass that is!
>
> So how can I, among many people, help turn the tide against public
> acceptance of such a garish factory image - be it Home or Store mode?
>
> I would estimate, since the mid-2000s, that millions of consumers
> automatically associate such overblown settings with HD and or 4K.
> How to educate them otherwise?

Why? They're happy with those crappy settings. Ignorance is bliss - let them be I say. Those settings are hard for me to watch, but I don't think anyone who likes cartoonishly bad video would listen to me, you, or anyone anyway. It was the same with the "sizzle and boom" smiley face audio graphic equalizer settings.

[Chris K-Man]

___________
And the thing is, I've done so many CRT and flat screens with the
patterns on DVE Blu Ray, that I've noticed a commonality in where
the basic settings (Contrast, Brightness, Color, etc) end up via those
patterns, that I could get almost any other TV too look the same
way by memory! It's not rocket science.

It's undoing bad attitudes toward basic adjustment and calibration
that's difficult - not doing the actual process.