I have owned the jvc av-28r4sk for almost 3 years. There is a buzzing/fizzing sound coming from the back of the TV. It increases and decreases as the picture colour changes or as the picture transfers from scene to scene.Even with the sound at mute I can still hear the noise coming from the back of the TV. Can anyone help?
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A common cause are failure of decopling capacitors in the audio section, and or the circuit board power distribution that feeds the audio board. Most of the capacitors are surface mount components. The standard fix is to start by changing the circuit boards that have the defective parts.
If the set is under warranty, call for warranty service. Out of warranty service is expensive for these TV sets.
is the fizzing noise when the screen is really bright? if so the scan coils on the tube have come loose and need glueing down with nail varnish i know it sounds strange but it really works
if the fizzing is coming from the tv then you have whats called dry joints
and this will need to be resoldered or the tv will shut down if you can do this yourself then the best way to find them is to remove the back and turn the tv on its side turn on the tv and turn off the light you will be able to see the dry joints sparking on the baord
Below is an image of rear side of your TV, Sony KDL-40W5500 Top right corner is marked there and possible cause of noise seems back light inverter board, there are high voltage going to CCFL inside LCD panel and seems high voltage leakage causing that buzzing/ fuzzing noise.
Replace back light inverter board upon voltage leakage confirmation. Thanks.
try and listen where the fizzing sound is coming from. go to the fuse box where the relays are.put your hand on the relays when the key is turned and identify the one making the noise. sounds like the start relay is faulty. needs changing. hope this helps.
Yes I believe you have a hardware failure in your audio amp IC. In some cases, a speaker will cause all the audio to distort, but its very rare for a speaker to cause this issue. If you just got it, you can return for a quick resolution, or contact a local repair center for a new main board replacement.
I'm thinking the buzz is from the deflection coil (yoke) on the neck of the tube or the power supply. Probably not the high voltage as you can hear the "buzz". If it's really that annoying, you can take a length of rubber tubing (no metal) and listen to the buzz coming from the chassis kind of like a stethoscope. STAY AWAY FROM THE HIGH VOLTAGE, please.
The yellow picture sounds like a blue chroma failure. A tube can be rejuvinated if need be but that's a job for a pro. Hope this helps.