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MY TV MODEL AV-48P776 WILLNOT COME ON MADE A LOUD POP

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  • secondsight Apr 03, 2009

    Ours did the same thing. It made a pop, then went off. We shut the power off and it went back on. About 20 minutes later, it did it again. Now the light that lets us know the TV is on, was flashing. But the picture won't come up. It is making a hissing noise, like when you are trying to light a stove burner, then shuts off. I am hoping we can fix it....with the economy, don't know if we can afford another TV...Please help!!! Thanks

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That loud pop might come from two different sources-

- The catastrophic failure of an electrolytic capacitor (not exactly rare) and is frequently accompanied by a fairly strong odor.
- The failure of a high power semiconductor such as a larger transistor or diode.

If you are adventurous, pull the plug from the wall, expose the innards and look closely at the bigger components you see.
Electrolytic capacitors are mostly cylindrical in shape and the ones likely to fail ludly are mounted perpendicular to the board.
Look for any with distended (bulging) tops or even split open.
Sometimes the electrolyte with form deposits around the case.

Power transistors and diodes are nearly always black epoxy cases with fairly thick leads extending through the board.
Transistors that work hard will be mounted on aluminum structures called 'heat sinks' that attempt to carry off the heat produced by the part.
Either of these may blow a hole in the epoxy case that is quite visible.

Locating the part is only a first step.
If you plan on doing this yourself, you will have to search for service info to find the part numbers of the failed parts and even if you replace those obviously defective, they may fail again because of undiagnosed problems elsewhere.

If you do find any, an honest tech will know why they probably failed and to look for the reason before replacing anything.

Posted on Jul 13, 2008

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