Question about Sony FD Trinitron WEGA KV-27FS100 27" TV

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Squeeling/hissing sound squeelin sound

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You are losing high voltage; if you sniff around the top or back of the set, you may smell ozone.
Pull the AC plug on the set overnight, remove the few screws holding the rear housing on, use a CLEAN (or new cheap) paint brush and if you have a vacuum with a hose, bring it along too. The CRT (picture tube) will be nasty, full of dust that is picking up moisture and creating a path for the high voltage to discharge and you need to clean it with the brush and it's better if you hold the vacuum hose close by so you can **** up the dust loosened by the brush. 
If you clean it well (dry, not wet), the problem should be gone.   

Posted on May 11, 2009

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Hissing sound from a Panasonic old TV...Sound and picture are OK. The hissing sound even continues when the MUTE on the Box is ON. The hissing only stops when the MUTE on the TV is ON. I am using the...


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Hello!
Try the audio out. Run the audio to a receiver to see if the audio is there. If it is, then I'd leave it hooked up to the receiver and save yourself some money. If there is not any low level audio out then I'd fix the set. The only Sony set I've ever seen that was not worth fixing was a 32" model from the early 1990's that had bad picture tubes after only 5 years. I am a Sony factory trained tech. Good Luck!

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Oct 13, 2008 | Sony KV-32FS13 TV

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RCA TV


Don't mistake hissing sound with a possible high pitched squeal. You probably have a shorted horizontal output transistor. Take it to a service center to be looked at by a professional.

C-Dog

Feb 12, 2008 | RCA F31317 31" TV

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It's probably the audio amp Ic, which in that unit is a LA7612n...
Replace that and esr the caps locally and you should be good as new.. Otherwise the hissing will eventually be heard on all channels...
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Dec 07, 2007 | GE 32GT740 32" TV

1 Answer

Hissing Sound


A hissing sound that comes from the back of the set (not from the speaker) usually indicates a high voltage leak, most likely around the "suction cup" at the top of the picture tube or around the flyback transformer. Remove the back of the set and turn it on, and when you hear the hissing sound, shut off all the lights in the room and you should be able to see a purple-ish or white-ish glow from the spot that is hissing. Shut the set off, discharge the high voltage and clean and seal the problem area. Of course this should be done by someone experienced with stopping high voltage leaks.

Jun 22, 2007 | Durabrand DU1901 TV

1 Answer

Noise


There is a coil in the set with a magnet glued to it, called the horizontal linearity coil. Sometimes the coil "sings", making a squeeling sound. I have seen this many times, and there really isnt anything actually electrically wrong with the set. To stop the squeeling the coil should be replaced.

Jun 06, 2007 | Zenith A36B41W 36" TV

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Sony KV-20FS120


It's normal for new sets, especially Sonys to do that due to some sort of gas build-up in the new tube. My set still gets a high-pitched buzz after power on and lasts for a minute or two before silencing. If the hissing continues when the TV is turned off return it to the shop ASAP. It could be a problem with the power supply, something getting ready to blow up. Good luck

May 30, 2006 | Sony FD Trinitron WEGA KV-20FS120 20" TV

1 Answer

Sanyo TV DS32224


Is the hissing or static sound comming from the speakers or from the back of the set itself?? Need more info please.

Mar 23, 2006 | Sanyo DS27910 27" TV

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