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Sanyo DP42746 Plasma 42" TV no picture    
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ntehicks



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

PostPosted: Tue Dec 22, 2009 9:47 pm    Post subject: Sanyo DP42746 Plasma 42" TV no picture Reply with quote

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

PostPosted: Mon Dec 28, 2009 4:08 pm    Post subject: Reply with quote

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

PostPosted: Sat Jan 02, 2010 1:29 am    Post subject: Reply with quote

Where would I find the Y and X sustain board?
JTS1957



Joined: 21 Jan 2009
Posts: 2305
Location: Far, Far Away

PostPosted: Sat Jan 02, 2010 6:42 am    Post subject: Reply with quote

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

PostPosted: Tue Jan 05, 2010 12:39 pm    Post subject: Reply with quote

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

PostPosted: Sat Jan 23, 2010 10:46 pm    Post subject: Reply with quote

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: 2305
Location: Far, Far Away

PostPosted: Sat Jan 23, 2010 11:57 pm    Post subject: Reply with quote

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

PostPosted: Fri Feb 05, 2010 11:24 pm    Post subject: Reply with quote

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.
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