I have an RCA g35302wk that has been a great TV for a number of years.
Recently it started doing this funky thing where the picture would
collapse and you are left with a thin horizontal line all the way across
the screen. The line is very bright, and the television still has audio
when this happens. At first if you turned the TV off for a few minutes
then back on the picture would clear up and it would be ok for a random
amount of time, between about 1/2 hour and 2 hours. One morning though it
went into the collapsed state and has been stuck there ever since. I found
very little repair infor for this TV on the internet, one page said to
replace U3101 (210736), U3200 (209956) and microprocessor. But I dont
think that is causing this issue. Can anyone give me any tips on anything
else that may be causing this picture collapse? I did replace the power
supply about 2 years ago. I am skilled in electronics and do have
experience with HV systems, I just do not know where to being looking. I
know the NEW HD world is coming up, but I would love to keep this TV going
if it can be fixed without much trouble.

Thanks in Advance,
Bill

Bill wrote:
I have an RCA g35302wk that has been a great TV for a number of years.
Recently it started doing this funky thing where the picture would
collapse and you are left with a thin horizontal line all the way across
the screen. The line is very bright, and the television still has audio
when this happens. At first if you turned the TV off for a few minutes
then back on the picture would clear up and it would be ok for a random
amount of time, between about 1/2 hour and 2 hours. One morning though it
went into the collapsed state and has been stuck there ever since. I found
very little repair infor for this TV on the internet, one page said to
replace U3101 (210736), U3200 (209956) and microprocessor. But I dont
think that is causing this issue. Can anyone give me any tips on anything
else that may be causing this picture collapse? I did replace the power
supply about 2 years ago. I am skilled in electronics and do have
experience with HV systems, I just do not know where to being looking. I
know the NEW HD world is coming up, but I would love to keep this TV going
if it can be fixed without much trouble.

Thanks in Advance,
Bill




This is simple, you've got a cracked solder joint in the vertical output
section, possibly a bad vertical output driver but usually it's just the
soldering. Don't run it like that, it'll burn the phosphors in the tube.
If you've got any electronics skills at all this should be a really easy
fix. It's easier to do it when the problem is still intermittent as you
can tap stuff with the set running to narrow it down.

On Mon, 12 May 2008 18:40:09 +0000, James Sweet wrote:


Bill wrote:
I have an RCA g35302wk that has been a great TV for a number of years.
Recently it started doing this funky thing where the picture would
collapse and you are left with a thin horizontal line all the way across
the screen. The line is very bright, and the television still has audio
when this happens. At first if you turned the TV off for a few minutes
then back on the picture would clear up and it would be ok for a random
amount of time, between about 1/2 hour and 2 hours. One morning though
it went into the collapsed state and has been stuck there ever since. I
found very little repair infor for this TV on the internet, one page
said to replace U3101 (210736), U3200 (209956) and microprocessor. But I
dont think that is causing this issue. Can anyone give me any tips on
anything else that may be causing this picture collapse? I did replace
the power supply about 2 years ago. I am skilled in electronics and do
have experience with HV systems, I just do not know where to being
looking. I know the NEW HD world is coming up, but I would love to keep
this TV going if it can be fixed without much trouble.

Thanks in Advance,
Bill




This is simple, you've got a cracked solder joint in the vertical output
section, possibly a bad vertical output driver but usually it's just the
soldering. Don't run it like that, it'll burn the phosphors in the tube.
If you've got any electronics skills at all this should be a really easy
fix. It's easier to do it when the problem is still intermittent as you
can tap stuff with the set running to narrow it down.

I have not been running it this way. Currently I have a litte 20" sitting
on top of that one so I can atleast watch the news. I thought it might be
a cracked solder joint. But I wanted to see if there was any info on the
internet first, thats where I came up on the replacement of the components
listed above. But when I looked at the schematic and it listed one of
those as an EEPROM I figured I would try to find the info somewhere else.
I will check for the cracked solder joints and let the group know the
outcome.

Thanks A Ton,
Bill

Bill wrote:
On Mon, 12 May 2008 18:40:09 +0000, James Sweet wrote:

Bill wrote:
I have an RCA g35302wk that has been a great TV for a number of years.
Recently it started doing this funky thing where the picture would
collapse and you are left with a thin horizontal line all the way across
the screen. The line is very bright, and the television still has audio
when this happens. At first if you turned the TV off for a few minutes
then back on the picture would clear up and it would be ok for a random
amount of time, between about 1/2 hour and 2 hours. One morning though
it went into the collapsed state and has been stuck there ever since. I
found very little repair infor for this TV on the internet, one page
said to replace U3101 (210736), U3200 (209956) and microprocessor. But I
dont think that is causing this issue. Can anyone give me any tips on
anything else that may be causing this picture collapse? I did replace
the power supply about 2 years ago. I am skilled in electronics and do
have experience with HV systems, I just do not know where to being
looking. I know the NEW HD world is coming up, but I would love to keep
this TV going if it can be fixed without much trouble.

Thanks in Advance,
Bill



This is simple, you've got a cracked solder joint in the vertical output
section, possibly a bad vertical output driver but usually it's just the
soldering. Don't run it like that, it'll burn the phosphors in the tube.
If you've got any electronics skills at all this should be a really easy
fix. It's easier to do it when the problem is still intermittent as you
can tap stuff with the set running to narrow it down.

I have not been running it this way. Currently I have a litte 20" sitting
on top of that one so I can atleast watch the news. I thought it might be
a cracked solder joint. But I wanted to see if there was any info on the
internet first, thats where I came up on the replacement of the components
listed above. But when I looked at the schematic and it listed one of
those as an EEPROM I figured I would try to find the info somewhere else.
I will check for the cracked solder joints and let the group know the
outcome.

Thanks A Ton,
Bill



The EEPROM is probably still fine. I forgot to mention, while you're in
there you should resolder the tuner shield grounds if this is one of the
sets affected by that. It'll prevent future issues.

Bill wrote in
news
I have an RCA g35302wk that has been a great TV for a number of years.
Recently it started doing this funky thing where the picture would
collapse and you are left with a thin horizontal line all the way
across the screen.

AKA "vertical collapse"


The line is very bright, and the television still
has audio when this happens. At first if you turned the TV off for a
few minutes then back on the picture would clear up and it would be ok
for a random amount of time, between about 1/2 hour and 2 hours.

Possible indication of a thermal problem.

morning though it went into the collapsed state and has been stuck
there ever since. I found very little repair infor for this TV on the
internet, one page said to replace U3101 (210736), U3200 (209956) and
microprocessor. But I dont think that is causing this issue. Can
anyone give me any tips on anything else that may be causing this
picture collapse? I did replace the power supply about 2 years ago. I
am skilled in electronics and do have experience with HV systems, I
just do not know where to being looking. I know the NEW HD world is
coming up, but I would love to keep this TV going if it can be fixed
without much trouble.


Certainly no expert here but I just fixed my RCA Home Theater (model
#F31224GG made in 1993) with exactly the same problem you are
experiencing. Turns out it was a bad solder joint for a resistor in the
vertical section; one leg of the resistor had come completely free from
the board's solder pad.

As the previous poster mentioned, try tapping the circuit board with an
insulated none-metallic implement of destruction (grin).....in my case,
the video began jumping more the closer I got to the defective joint.
Also try moving the legs of the various components where they attach to
their pads....usually the bad leg connection will move freely with
little effort.

If after trying this method nothing is readily apparent, then you might
have a cracked circuit board trace.....use previously mentioned
implement of destruction to put pressure on the board itself to see if
the trace will join itself back together. Giving the board an eyeball
over with a magnifying glass is another method to try.

If none of the above works out, then it's time to start looking for
failed components with various pieces of testing equipment and
troubleshooting methods.....which for the most part I will leave up to
more knowledgable participants in this newsgroup to share their wisdom
with you.

Good luck.....hopefully you will be able to track down the source of the
problem. :-)

Greetings Bill..

Regarding:
"I am skilled in electronics and do have experience with HV systems, I
just do not know where to being looking...."

I suspect that you meant BEGIN looking..

First and foremost, this has nothing to do with an EEPROM or a
microprocessor.

Interesting.. One of the first things almost any school teaches (trade
school, 2 year junior colleges or even the universities) is about
video systems. In regards to electrical circuits and theory, it's a
good place to learn about oscillators, amplifiers, deflection both
vertical and horizontal, power supplies etc. Even though our video
sets are changing, the theory behind the above circuits still
applies..

As illustrated in many a fix-it-yourself softbound books still on the
shelf regarding TV repair, this is a vertical oscillator/amplifier
issue. Now days, both are usually in an integrated circuit with
polarized electrolytic capacitors hanging off the IC. Since the IC
tends to get rather hot in many installations, an initial inspection
of the IC is a good idea. I've recently fixed a JVC with intermittent
vertical deflection issues by merely sucking up the old solder
(Soldapullt) and re-soldering it with a clean soldering job on all
pins, then removing the residual flux with alcohol. The TV is still
working years later now.

In addition, I've got a 25" stereo color TV that was given to me by
someone at work with the same symptoms that you describe, bright
horizontal line (in the middle of the CRT) with no vertical
deflection - sound is A-OK. It seems that the previous families kids
liked to push all the front panel buttons real quick - including the
on/off button - unfortunately.. The first thing I did was call
Thompson and order the schematics for the TV. Sure enough, the
vertical oscillator/amplifier IC was shot. Once replaced, the video
folded over at the top of the now full deflected video image. Why the
folded over image, defective polarized electrolytic capacitors. As I
seem to recall, there's usually a 33ufd capacitor (amongst a few
others) that are highly suspect. How to determine for sure, an ESR
(Equivalent Series Resistance) checker will determine in two shakes
which electrolytics are bad. Since the electrolytics are relatively
inexpensive, you can always shotgun with about 5 or 6 around the IC,
but - obviously, measuring for the defective component(s) is always
preferred. Once the IC and the capacitors were replaced, I've been
enjoying that free stereo TV ever since. The picture is now beautiful
and, prior to doing the 'fix,' I cleaned out the cabinet completely
and got rid of the dust & spiders. They had put it in the garage on
the floor..

Cheers,
Mr. Mentor



"Bill" wrote in message
news |I have an RCA g35302wk that has been a great TV for a number of
years.
| Recently it started doing this funky thing where the picture would
| collapse and you are left with a thin horizontal line all the way
across
| the screen. The line is very bright, and the television still has
audio
| when this happens. At first if you turned the TV off for a few
minutes
| then back on the picture would clear up and it would be ok for a
random
| amount of time, between about 1/2 hour and 2 hours. One morning
though it
| went into the collapsed state and has been stuck there ever since. I
found
| very little repair infor for this TV on the internet, one page said
to
| replace U3101 (210736), U3200 (209956) and microprocessor. But I
dont
| think that is causing this issue. Can anyone give me any tips on
anything
| else that may be causing this picture collapse? I did replace the
power
| supply about 2 years ago. I am skilled in electronics and do have
| experience with HV systems, I just do not know where to being
looking. I
| know the NEW HD world is coming up, but I would love to keep this TV
going
| if it can be fixed without much trouble.
|
| Thanks in Advance,
| Bill
|
|