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High pitched noise coming from TV hooked up to PC

post #1 of 8
Thread Starter 
Have a Westinghouse 1080p TV that I purchased used that has an obnoxious high pitched noise that generally only happens while it is powered off and plugged in. Not sure why but it has not done it while its on until recently I discovered something. When I open a very large photo in browser and zoom in it immediately activates that noise. I can zoom back out and its off. It is louder if it is a larger image and quieter the smaller the image.

http://sinhardware.com/images/vrmlist.png

The VRM list here is what I noticed it on and it is fairly loud. It is unbelievably annoying when it is off as well. It does not happen during gaming but I would like to fix it so I do not have to deal with it while looking at large pixel images and especially when it is off. Any ideas what could be causing the issue and if it is something I might be able to fix? This is a fairly large TV I think it is a LCD, model is: TX-47F430S

PC specs in signature. Hooked to TV through HDMI.
Edited by dmfree88 - 6/19/16 at 12:04am
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post #2 of 8
Does it whine without the PC attached?

I have seen shoddy PC PSU's cause electronic noise to bleed over the grounding shield. ESPECIALLY in laptops. Friends ROG does this with any high gain analog audio equipment or TV.
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post #3 of 8
Thread Starter 
Yes it does it with no PC attached when it is off as well. This is the first time I have really heard it while it is on though. Thought it was strange that it did it while viewing high res photos. Not sure whether it is a separate noise or not though. Could be 2 different issues causing a similar noise.
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post #4 of 8
If its a CCFL unit, its possible that the CCFL drivers are responding to vdroop when driving the LCD to light/dark levels. This is also possible for PWM driven LED backlights. Try a full black screen vs a full white screen.
Edited by KarathKasun - 6/19/16 at 4:14pm
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post #5 of 8
Thread Starter 
hmm yeah only seems to be with the white photos. I guess it is not a big deal, just seems strange. Not sure why it does it when it is powered off either that is what is really annoying. Mostly because if I leave it on standby then the "No device connected" square at the top is burnt into the screen. I either have to leave it on screen saver or completely off with that high pitched squeel.
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post #6 of 8
Are you sure its an LCD? Does the screen have a substantial glow when its off?

Regardless. the power supply is probably just total crap. You could disassemble and debug the circuit, perhaps glue could fix it if its a coil. It would be a major pain to fix unless you are an EE.
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post #7 of 8
Thread Starter 
Not exactly sure, no glow. I thought it was plasma since the screen burns in images so easily. I really dont know for sure but the information I can find on the model says LCD:

http://www.crutchfield.com/S-D0iEOu167FU/p_647TX47430/Westinghouse-TX-47F430S.html

I would suppose it is probably not worth the effort. The screen has a little bit of damage and there is a dark section running down it. Not exactly the best quality hardware. Just cant afford an upgrade and it is ridiculously huge so it makes up for the somewhat poor picture quality. Backlight is rated at 17 years though so maybe if it gets worse I might crack it open to attempt a repair but for now I guess I will deal with it.
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post #8 of 8
Its LCD then and one of the CCFL's is damaged or burnt out. That is where the whine is coming from while it is on. The other whine when powered off is probably caused by a shoddy standby circuit.
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