Question about RCA P52921 52" Rear Projection Television
My RCA P52920BL 52" projection doen't turn on. For a couple of days the set would turn, and I would see an arc on the screen. Next the tv would turn on, but after a minute it would shut off for a couple of seconds then turn on. The set would do this 4 or 5 times then stay on. Then it wouldn't turn on at all. I can here it trying to turn on through the speakers, but it doesn't. I am a tech, and know the problem is in the power supply, but don't have a service manual... Henry
The RCA P52920BL uses the PTK195 series chassis. The most common reason for the set not turning on is a shorted flyback transformer. To check this, measure the B+ when the set is plugged in - it should be around 145 volts. When you turn the set on, see if the B+ drops down at all. If the flyback is shorted, the set will try to start but the flyback draws too much current. The microprocessor senses this and immediately shuts the set back off. To confirm, unsolder the jumper wire bringing B+ to the flyback and put a 100 Watt bulb in its place. Turn the set on and if the flyback is shorted, the set will now stay on but the bulb will glow as bright as if it was plugged into the wall. If this is the case, replace the flyback. Let me know what you find and we will take it from there.
Posted on Aug 25, 2007
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Posted on Jan 02, 2017
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