Sony kp-41s3u 50" hissing sound

A suggestion here: Carefully remove back cover and plug set back in and turn on---DO NOT STICK YOUR HANDS INSIDE!---Try to locate where the sound is coming from---the 5 blinks is an error code--If model is correct as listed here I or you can GOOGLE the model number with "5 blinks" to see what that code means--clearly related to the hiss you hear.

My money would be a high voltage issue but correct model number needs to be confirmed.

If you locate the audio board, check for dried up electrolytic capacitors and dry joints around the output IC itself.
That should fix your fault.

That model set was known for Chinese capacitors that failed, replace the power supply or look for bulged caps and replace them if your able to

Ur high voltage is dying,the FBT,the flyback transformer is the prob.the big block of plastic with a red wire a with a cap hook to the CRT(crt tv).

I found out that if I manually turn the speakers down on the tv and then turn it up with the remote control the hissing sound goes away

If you disconnect or power off the converter box does the hiss go away?
If you connect a VCR or DVD player does it still have the hiss? We
need to isolate what source is causing the hiss if it is from the set or
if it is from the converter box.
When you turn the volume control down on the set, does the hiss
reduce in level? If mute stops it, it should reduce in level as you
turn the volume down. Then turn up the sound level control on
the converter box whether its a manual control or by remote. If you
can get a combination that minimizes the hiss and gets higher sound
level from the programming that may cure it.
I am not familiar with the converter box you are using. Are you using
Audio/Video cables from it to the set or is it coming out with coaxial cable
and used on a channel? If you are using a very old set with a tuner input
perhaps the fine tuning is out of adjustment.

I have the Sony Bravia KDL-46S4100. The high-picthed hiss drives me insane. I have a work around but not a fix. Go into your TV's menu and find BACKLIGHT. Adjust it from 1-9 with the house quiet and find what frequency of the hiss is the least annoying.


Sony Bravia high pitch hiss hissing sound high frequency

Replace the lamp. In rare cases, the lamp power supply or lamp ballast may also need replacing. But, replace the lamp first, and use an original Sony lamp not a cheap aftermarket replacement. If this helps, please be sure to rate the fix! Thanks!

I have a sony kp-41T65 burnt capacitor C514. need specs. Help please. Thanks

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.