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Loud whinning, high pitch noise coming from TV when turned on.
We have an RCA HDTV, Model .... HD50LPW42YX2.....when you turn it on it whines, screams whatever you want to call it. We have clear picture and sound, but the noise just goes on an on. Is this the capacitor?
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Most whining sets have a problem in the power supply. A transistor under abnormal load or frequency can whine. I would turn it off, and if you are not inclined to fix such stuff, haul it to a shop. If inclined, search for a service manual, or remove the back and find the board with the power cord socket, get the numbers and search ebay and the web for a replacement board. You can also search for hints using the model number.
The whine is not good, and will eat the transistor if left in that condition. Most bad capacitors will bulge at the top when failed and you can replace with low ESR capacitors 105C rated of the same volts/farads/dimension and maybe fix the supply yourself.
This is a coil, now a NOISY coil.. It is a common problem, and happens often. The whine is caused by current passing thru the copper windings and making them vibrate! A commonly accepted repair for this situation is to squirt some regular old super glue into the copper windings and let it harden for a few minutes..Viola! no more whine!
If it weren't for the high pitch whining noise. I would say it probably is an internal fuse inside the chasis. It is rated at 1.5 to 2.0 amps. With the whining noise it sounds like a trouble shooting bench
job. Problems occur when a electrical/electronics device is turned on and turned off. Inrush voltage,
when it is turned on, can go up to three times more than normal. This also happens at turn off. Solid state components usually fail at this time. I don't feel that this is a problem that can be fixed in the home.---BBB
the high pitch noise is from the HV. arcing acrss each other.
( the screen comes up at a pop).
I suggest get a better one. ( sorry! no domastic brand).
Ok maybe this may help .... there is a coil LL08 I believe... somtimes it creates a high pitch whine like you describe.. its stands up on the deflection board..it basicaly a large coil of copper wire....you can take silcon and put on the coil...in effect damping the ocillations...hope that might help
The color wheel can make a whinning sound for sure, However it should not continue to whine after shutting it off. That sounds more like the fan used to cool the lamp, as that will continue to run after the set is shut off. How soon does the whinning start when you push power? Let me know I should be able to help you out. DLPs are my specialty
there has been a few cases of a coil in the cuircit whinning. and there is a simple fix...applying some silicone onto the coil to dampen it. the coil is ll037 on deflectin board. location m2 a black compnent with coil of copper wire wrap around it. thats my initale thought. it may be more. since you still have a picture.. any questions email me at [email protected]
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