Zenith System3 SY2738RK Lost Red Color
jrz...@comcast.home
I have A Zenith System3 model SY2738RK TV.
It wasin a rental property and I received a work order stating no
picture.
Actually, it was all snowy, barely perceptible picture.
An authorized Zenith repair shop replaced a transformer and I took the
set back to the rental.
However, the color did not look as sharp no mater what I did to adjust
via the onscreen menus.
Now, all the red is gone. Blue is great. Yellow is not quite right.
I was advised by more than one repair facility that a new picture tube
was the solution. Zenith sold me a replacement for $128 including
shiping.
I installed it and the red is still gone. No change whatsoever.
Does anyone have any idea what the problem is or what I can do to
debug it ?
Where can I get manuals ?
I can get just about any part I need from online stores I have found.
Or, is this a lost cause ?
TIA
Glenn
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Laserhelper
>Does anyone have any idea what the problem is or what I can do to
>debug it ?
Yeah.
Ditch the Zenith and go Sony or Toshiba.
Zenith is notoriously unreliable. - Reinhart
Laserhelper
>was the solution. Zenith sold me a replacement for $128 including
>shiping.
>I installed it and the red is still gone. No change whatsoever.
Ah, didn't catch this bit of info.
Did you check the internal color adjustments, usually located on the circuit
board that connects to the end pins of the picture tube?
There could also be marginal components on this board as well, or possibly even
cracked solder joints. - Reinhart
Bubba
Bill Jr
board.
Can't remember the location/part numbers right now, am at home and the
prints are at the shop.
If I remember correctly the subs won't work, need the original Zenith part
numbers for this.
It'll be Monday before I can come up with this info, unless someone else
here remembers.
Good Luck,
Bill Jr
<jrz...@comcast.home> wrote in message
news:7is4vus15eian11f4...@4ax.com...
Arthur Jernberg
on the main pcb. Should be 3 of them together in a row, the voltages should
be almost identical r,b,g.
"Bill Jr" <bi...@nospam.usa2net.net> wrote in message
news:0qyI9.318931$fa.61...@twister.tampabay.rr.com...
jrz...@comcast.net
Thx for the info.
I would appreciate it if you could get the extra info when you get bck
to the shop.
For a do-it-yourselfer, is it better to get the who;e board ?
I have a feeling there may have been a power surge or some other
unnatural forces(spillage from water) involved.
Also, does the main module board come with all the "other"
modules(tuner HOT, CRT Board) attached. Do I need to do any oldering
to install a main board ?
Thx for the help
Glenn
On Sun, 08 Dec 2002 02:48:28 GMT, "Bill Jr" <bi...@nospam.usa2net.net>
wrote:
leeppp
I AGREE!!!!!!!!!!!!!!!!!!!!!!!!! LEE
John Del
>From: laser...@aol.com (Laserhelper)
>Yeah.
>
>Ditch the Zenith and go Sony or Toshiba.
>
>Zenith is notoriously unreliable. - Reinhart
>
>
That's really unfair. He already has a new CRT in it, and the Zenith's with
bad CRTs usually have reliable chassis. Once fixed, he's good to go. It's
unfortunate the color problem was misdiagnosed, although it's possible the
failing red gun may have arced on flameout and took out the red kine output as
well.
BTW, I took in a 1995 Sony 35 and a Toshiba 35 (a year older maybe) on trade
Saturday. The Sony has the infamous IK flash and poor pix, and the Toshiba had
a shorted K to ground. We blasted out the short, but now there's no red. Both
heading for the landfill.
John
Sam Goldwasser
> That's really unfair. He already has a new CRT in it, and the Zenith's with
> bad CRTs usually have reliable chassis. Once fixed, he's good to go. It's
> unfortunate the color problem was misdiagnosed, although it's possible the
> failing red gun may have arced on flameout and took out the red kine output
> as well.
Yeah, like the Zenith, may have been a System III, I pulled off the curb
about 5 years ago. Had H-K short in red gun. Isolated it. Still working,
in a house with 3 young kids, used several hours a day.
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Laserhelper
>Saturday. The Sony has the infamous IK flash and poor pix, and the Toshiba
>had
>a shorted K to ground. We blasted out the short, but now there's no red.
>Both
>heading for the landfill.
Crap happens. No one make will have completely perfect yields and how they're
used over the years will determine its outcome in the future. However, there's
no sensible reason to buy American electronics anymore. They seem generally
lower in quality. Then again, that's an oxymoron, considering that some of the
well-known American brands are mainly owned by foreign interests. In the case
of GE, however, even though they are not owned by a foreign entity, they do
have their TVs made by the French government (Thomson) for them.
Why bother with American TVs anymore? They're junk in comparison to Japanese
sets.
As for my bias with Sony, seeing them in use nonstop for professional
production, even consumer grade sets, sort of makes you opinionated with the
brand. Also having some professionals outright praise Sony and bash Panasonic
will do that to you, too. - Reinhart
Laserhelper
>
>
>Ditch the Zenith and go Sony or Toshiba.
>
There is merit to that, you know.
Although, I didn't catch the little bit about the tube already being replaced.
With that much money tied into it, he might as well get the problem fixed.
I just hope for him that the flyback isn't worn. - Reinhart
Michael A. Terrell
What "American" TV?
--
Michael A. Terrell
Central Florida
Tom MacIntyre
wrote:
But was that a Zenith, or a ZENITH? :-)
Tom
David Harris
Why did you not take it back to the Zenith servicer and
have the job completed?
Now to the fix.
Replace Q2204 on the main board. If it is shorted, it will
kill the red. It is PNP, and an ECG 159 will work. Less likely would
be Q5103 on the CRT socket. The OEM number is 121-1291-01. Do not
use a sub.
David, on the Illinois prairie.
jrz...@comcast.net
Thx for the Info.
To answer your question.
by the time I realised it was not working, over three months had
passed. My fault, should have known better and checked more
thoroughly.
The red degraded over time after that. I t was used in a rental and I
get there only a few times a year. When I realised the red was gone,
the original shop was no longer a certified Zenith repair shop.
Anyway, more info on the problem. The resistor for the red, on the CRT
board shows no voltage when set is powered on. Wen off, resistance
matches the blue an green.
I do not have a diagram or schematic, but I am looking for the parts
you suggested.
Thanks for the help
On 9 Dec 2002 14:30:25 -0800, dhar...@my-deja.com (David Harris)
wrote:
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jrz...@comcast.net
call :-). The advice to go to Sony is not without merit.
However, this is becoming a personal issue now :-) Ineed to win.
I tested the resistor on the CRT board for the red gun and it shows no
voltage when running. Without power, it shows a normal
resistance(compared to the resistors fo blue and green)
I am trying to locate and test the parts Dave suggested.
Plug and play is good.
Any further help is greatly appreciated
Thanks again
Glenn Brooks
Tom MacIntyre
>I would like to thank all the people who have replied to my distress
>call :-). The advice to go to Sony is not without merit.
>However, this is becoming a personal issue now :-) Ineed to win.
>
>I tested the resistor on the CRT board for the red gun and it shows no
>voltage when running. Without power, it shows a normal
>resistance(compared to the resistors fo blue and green)
>I am trying to locate and test the parts Dave suggested.
>Plug and play is good.
>Any further help is greatly appreciated
>
>Thanks again
>Glenn Brooks
Just after shutting off the set, check the red resistor and see if it
is very much hotter than the other two. If so, check the red drive
transistor.
Tom