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Problem for HP PL4260N 42 in. HDTV Plasma Television

I hve a hp 42 inch pasma it comes on but no

By mushufan2 on Nov 07, 2009

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i hve a hp 42 inch pasma it comes on but no picture what do u think is wrong with it

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Best Solution

posted on Nov 07, 2009

freetek

Rank: Wiz

Expert
Rating: 85%, 1856 votes

If you have sound but no picture, the power supply for the plasma display, which is a device requiring high voltage has failed. This may be a separate board in your unit so I am pasting my suggested path below:
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If the display is failing to turn on, but sound is still present, the high voltage power supply is probably at fault and without some technical background and a couple of test instruments, you will not be able to do the repair yourself.

What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for one or possibly two separate boards with mostly larger components on it; they will have a ferrite core (no laminations as with a line-frequency part) transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.

Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.

If you see signs of overheating such as discoloration of the board material, the PSU may not be repairable but if you can find a part number on the board, you might be able to buy the power supply from the mfr. and install it yourself but it will likely have the same problem eventually unless they have altered the design or improved component quality.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
The main power supply still may be at fault since most are capable of switching on and off if a downstream problem is causing an overload.

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