Hissing noise will be from high voltage regulator, i would suggest to do following:
1. switch tv off
2. remove plug from the wall
3. using air blower (compressor attachment - not leaf one!) blow the dust, especially from high voltage box section
4. connect the tv and switch on
if tv still issue hissing noise - follow 1 and 2 then:
3. remove back cover
4. use air blower again...
5. re-install back cover
6. reconnect tv and switch on
if hissing noise persist - check for blown capacitors on high voltage, replace if necessary, they have nasty tendency to pop if they are too long in storage, especially if tehy were overheated or frozen.
hope this will help you solve the problem, do not forget to vote...
SOURCE: my 5 year old samsung flat tv will not turn on
probably the power supply and could also be the L-main board
SOURCE: sylvania 42" flat screen won't turn on
First you should check the fuse and the wiring in your tv by removing the back cover. Make sure no wires are bare or touching. If there are any, wrap them with electrical tape.
If you cannot see anything wrong by looking, then it is probably the set has a bad transformer (high voltage)
SOURCE: Flat screen TV has a leak inside, I think. At the
The display is broken, this isn't a cost effective fix either, try and find another tv, same model number, with a good lcd module or just scrap it for parts. If the break is low enough you may be able to live with it. Sorry to be the harbinger of doom and gloom....
SOURCE: buzzing/fizzing noise from back of sony flat screen tv
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.
Testimonial: "Thank you very much for the very prompt reply. This seems a very likely cause. My TV is only a week old so I will contact the supplier. Thanks again."
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