SOURCE: R4252 No picture, sound OK Y-Drive buffers overheating
Try to replace the Logic Board, about 50% chance to fix the problem.
SOURCE: x-sus board replaced year later same pop of death
test the main board next to it- the are usually replaced together sometimes called the scan board-you can check for blown fuses on the x sus and put the back of your hand to the heat sinks- see if they warm up or not (be careful) if they stay cold with set on for several minutes then its dead
SOURCE: ps-42s5h plasma goes black when warmed up.
we ( technicians ) call it a cold solder or burnt solder , just need to open the tv and give a VISUAL look thru the entire PC Board , good luck , AJ
SOURCE: HPT5054 50 in. HDTV-Ready Plasma Television: Samsung HPT5054X/XAA - No picture, Sound OK, Have ...
It's not the x main. 90% of the time it's a y buffer that goes out. It's usually the top buffer. 3/4 of the time the buffer takes out the y main board too. You cannot just replace the y-main or buffer because it will just burn out the other within seconds. Also about 1/4 of the time it'll take out the top transformer on the power supply too. The solution? First disconnect the power to the y main board. turn on the television and check the voltages coming off of it. Careful it's high voltage 208V! Remember it's DC too. Then disconnect the buffers from the y main board. You can try powering the y-main up to see if the little LED lights up. This does not indicate it's working though but it'll tell you if it is possible to fix. The fixes for these boards is only for electronics guys. It usually involves replacing 1-3 capacitors and 1-4 FET's. Since a bad buffer can take out a good y main in seconds it's usually recommended that one replace all 3 boards at the same time. It's a $250 fix. How do I know all this? I've now repaired 5 of these televisions. I owned one and spent close to 600 repairing it. I bought misc parts and broken sets online for months before I had 2 different repair guys walk me through the process of repairing them. I had so much cash tied up in parts that I bought 3 more dead sets and repaired them to justify all my spending. I've never had an x board fail. I've had EVERY top buffer fail. I've had all but 1 y-mains fail. and 1 lower buffer fail. I've also had the y buffer fry it's top chip, blow a capacitor and FET on the y-main, and fry the top transformer on the power supply before my eyes. It only took 5 seconds. Replacement of the 3 y boards will almost always fix the sound but no picture problem. Hope this helps!
SOURCE: Hello, I have a Hitachi
The power supply board has been known to cause the problem you describe, available at www.discount-merchant.com part# MPF7718 price $129.95 the cause is in the regulator capacitors going low in value.
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