RCA F31672ET No Power only a whining noise when plugged in Please help
I'm checking out an RCA F31672ET for a friend of mine.
The TV was working fine untill she left it one night while we out for a few hours. When we returned the tv appeared to be off but there was a whistling/whining noise coming from it. The power button was non responsive so I unplugged it. The sound did not end abruptly but instead faded away within a few seconds.
I have some experience repairing video game monitors & chassis & I'm fairly handy with my solder station but I have no expertise whatsoever in trouble shooting.
If any of you out there have some idea of what this could be, I would truly appreciated your input.
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Re: RCA F31672ET No Power only a whining noise when...
Most likely you have a bad flyback transformer and shorted horizontal output transistor. The whistling sound that you hear is the power supply telling you that it has a short in one of the circuits it powers. Most likely the circuit mentioned above.
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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