samsung plasma tv no pic but sound

[terry504]

i got a 50inch model number s50hw-ybo1. i learned a trick on youtube on how you could heat tha back of the tv to temporarily restore some bad capacitors. i did it and it worked. the set came on and looked great. i just couldnt find out which board was bad, so i bought a power supply board and the set still didnt come back on, bought a sub power board and still nothing. someone said it had to be the x'main or the ysus board, replaced both of them and still no pic but sound. i'm lost and slowly buying this tv as if its brand new. i'm still suspecting it to be the ysus board cause i had a ton of problems out of the company i bought it from so i would like to find somewhere to have it checked out before i go any further. any suggestions would be great. and i really dont believe my upper and lower buffers are bad at the same time when it came on when i simply heated the back up

[sweetguy66]

it could still be one of the buffer boards, one way to check this is to switch boards if it comeon then yopu have a bad upper or lower buffer board, try it, carl
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i am a retired oerson, i have been in electronics for about 35 years,i have always found thayt a chellange to do something is alway a good motervater,

[train123]

Terry. You just need to carry the heating trick one step further. If the set comes back on every time you warm up the back, the next step is to use something like a hair dryer and just heat up each board separately. Once you've isolated the bad board, you can then carefully heat up a small area of the board at a time and you'll find the component causing your problem. If you want to take this one step further, you can take a can of cold spray (usually available at electronic parts stores) and spray the suspected part. The bad part will then fail again as you cool it. If you can't find cold spray, you can take canned air and spray it when the can is upside down and get the same result.

[train123]

Oh, I almost forgot, this trick will also find a cracked solder connection so remember that you could have a bad solder joint instead of a bad part.