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Rca 27" flat screen has a high pitched whine when i plug it in and it will not turn on

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Power supply is out

Posted on Aug 31, 2008

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Do some research as this model is also prone to the color wheel going bad---the high pitched whine or even fan like sound points to it.

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The whine is a short somewhere---+ and - are marked on the board for each cap if it is polarized---usually the - will have a shaded white mark on top of board--if you got one in backwards it can explode......

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That could be either the color wheel or one of the fans. try listening to which area of the set its coming from.

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Check the color wheel and any fans running on the unit. The color wheels make a high pitch whin right before they quit as well as the cooling fans.

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I have a Hitachi Ultra Vison 57S700 2004 model, the TV has had a slight high piched whine for a couple of weeks and today the screen went green then black and the sound was gone. When it is turned on the...


This tv is under five years old?Yes,it is worth fixing.Over five,i would compare the prices for a new LCD tv and the quote priced from the Tv Tech.for the old tv.This tv have high voltage problems around the Deflection circuitries area.Could be any things burn in this area.The high pitched whine sound,i'm sure it is from the FBT-the high voltages flyback transformer,high voltages current have no where to go.Must hire a tv tech. to troubleshoots and replace parts on the Deflection circuitries area.Also the FBT could be dead too,because HV Current bounces back forth and have no where else to go.The prices to troubleshoot unknown problems is about $400 bucks and plus cost of replacement of parts.

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1 Answer

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The power supply on this model will whine when it is shorted or overloaded - the set would have to be brought in to determine exact cause.

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Sounds like a coil is vibrating or a component is bad causing the transformer to whine. Could possibly just need soldering.

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I haven't worked on an RCA DLP but have on Samsung DLP, based on your description it sounds like the color wheel is bad. Take the back off and turn on TV make sure its not a fan making the noise ,but most likely its the "wheel" it is inside the light engine probably right next to where the lamp is plugged in. If the whine comes from this area definitely the wheel.

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1 Answer

High pitched whine


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

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solder around flyback pins ,also these sets are having major problems with flyback transfromers/high voltage tripplers.let know how you come out after soldering HV transfromer.

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