Riddled TV Repair Forum

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I Have this TV that I get sound but no picture. and no picture means I get no light at all from the screen. I have worked on the old CRT TV's and thought a plasma would be a little similar as in a flyback or transformer that would give high voltage to run the plasma tube. on the main power supply board there is a green led. It lights and stays on solid. I noticed it has a blink code silk screened on the board going from 1 to 15 but this led is not blinking. as I look into the back of this TV i have noticed that there is an led also on the back side of what looks to be the main video board. and it just blinks constant. That LED is also green. What I am thinking is that there is something that is not allowing power to get somewhere else. if someone has an idea I am open to try anything. thanks..

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dicepackage · Joined: 14 Sep 2009 Posts: 40 Location: Detroit

It sounds to me like you most likely have a bad y-sustain board as I have had this issue on several tvs. I'd recommend taking the voltages going into the y-sustain and x-sustain board and see if the match what the power supply should be putting out. If you can find a service manual for your TV you might be able to get a better meaning of the LEDs.

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

Where would I find the Y and X sustain board?

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

The "originals:" Inside your TV.
The "replacements:" Somewhere online.

Careful, there are many defective boards that are "pulled from service" (broken screen set) that places will gladly sell you. Make sure they have a good DOA exchange or return/refund policy. Cool

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

is it possible to do board level repair. or do you think the parts are micro chips?
if it was a diode or scr I would like to try to replace the part?
what do you think?

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ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

so I get power up. the set turns on and I can hear audio from the input (dvd movie) playing through the TV. I am wondering how I can pin point which board to replace.

JTS1957 · Joined: 21 Jan 2009 Posts: 2395 Location: Far, Far Away

The service literature should at least allow you to pinpoint the board(s) at fault.

ntehicks · Joined: 25 Mar 2009 Posts: 162 Location: Herriman, Utah

I was reading on here about feeling the heatsinks and found that one on the upper Y buffer was getting hot. I then removed the upper buffer and now I get a half screen of lines. my question is if I get a new top buffer will these lines go away? even though there is only half of the screen working should it be a visable picture or does it need both upper and lower buffers to give a good picture.