Sound Issue There is a high pitched noise coming from my television. It only occurs when the TV is on and goes away when it is on mute. It is less noticeable if headphones are plugged in, but it is still there. The noise volume is consistent, in other words it does not change regardless of the TV volume level.

Steve Allison

• 5569 Answers
• Posted on Dec 18, 2009

SOURCE: High pitched hum from LNT5265FX when powered off

What may be doing this a a type of transformer used in switching power supplies with a ferrite core. It is rare but, if the transformer and its windings are not well secured with lacquer or epoxy, the core or windings can vibrate at a frequency related to its operating frequency which is normally beyond the range of human hearing; typically, 50,000 cycles or higher. This lower frequency is called a subharmonic. When the set is running, the electrical loading of this transformer may be causing the singing to cease because of the changes in the strength of the magnetic field (higher current) until turned off again.

Bud Martin

• 11361 Answers
• Posted on Dec 22, 2009

SOURCE: loud buzzing noise on vizio tv

It sound like you may have sound processor problem which is part of the main board, I would also look at the 12vdc from power supply to make sure it is clean DC.
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http://en.wikipedia.org/wiki/Capacitor_plague

SOURCE: High Pitch Sound when TV is turned on.

problem with capacitors in a power supply. if you 're a pro, poke she set open, by taking away 3 screws at the bottomof plastic grill, right above in/out plugs. slide grill down, make sure take screws completely out. another big screw in a miggle of grill must go out. after you manage to get plastic out, you'll get metal shieild off, by taking another 3 scews at the bottom. pry it open and lift it up, then slide it out of the assembly(looks like a rectangular box. then, expose the electronics: power supply is at the top of the module, trace power cord to that. disconnect power from the unit and look for bloated elecrolytic capacitors.found the ones, replace with exact value.
good luck.

SOURCE: when turning on TV sound volume is too high

HI check the menu setings under the sound menu. there may be a power on volume setting in there

SOURCE: Philips widescreen flat TV model #50PF9966-37 50"

From what I'm seeing online, the bulbs in the Ambilight may be the culprit. I also read that a firmware upgrade could fix the issue too. There was also a recall of some TV's with that issue, so I would check with Philips about your model and serial number and see if your TV was included in the recall. If you raise enough cain and threaten to never buy from them again, they may get your set fixed for you... even if the warranty is up!

Good luck and please post feedback!

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