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Re: my tv suxxx
I'm assuming this is a projection set given the size. Sony TV's have circuits to monitor picture tube operation and cut off video when something isn't within limits. It's very likely your set has one or more bad tubes (there are 3, for red, green and blue), troubles on the circuit boards connecting to them, or problems with the set's control circuits. This set should be serviced by a professional if you want to keep it.
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common problem on samsung. bad DMD BOARD. these are modules located on light-engine. there very proud of this little jewel. usually parts cost 400-500.00 dollars for the shop. after mark-up & labor don't be shocked at 600.00-700.00 repair bill. this is of coarse for dmd replacement. 85-90%. if logic board, est. 400-500.00 repair. mch
the problem there is a loose connection on the board,you said that you smacked the right side of the tv and it goes normal.there are parts that should be resolder on the board in order to back into normal operation.
This should be a quick fix. Try resoldering the vertical IC. This is a small flat IC attached to a heat sink with about 11 pins. It should be marked LA7837 or something similar. That should resolve the problem.
The most common problem (I have fixed lots) is the Vertical amplifier has developed a loose connection. It probably just needs resoldering. As things expand it makes and looses connection you picture goes in and out. The vertical chip is a large black chip that gets hot, over time it degrades the solder until a connection is damaged. Most newer sets have a protection circuit that senses the lack of height, and shuts down the picture tube to save it. When the picture dropped to a line on older TVs and left that way too long it would burn a line into the face of the picture tube. You then had to have the picture tube replaced along with the vertical amp. it's kinda like a screensaver for your TV.
This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.