Question about RCA D52W20 52" Rear Projection HDTV-Ready Television

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Rca hdtv model r52wh74 turns off after 25mins and wont turn back on. I have to leave it unplugged for a while for it to turn back on. I also had the convergence problem, switched the fuse, and it fixed it. But the tv shut off after 25mins and the convergence problem came back. please help???

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  • elise42290 May 17, 2009

    you dont think if I replace the diode on the main power supply then the same fuse again and resolder the joints on the flyback it would fix the problem?

  • Anonymous May 17, 2009

    turns off and wont turn back on for a period of time

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  • 431 Answers

Hi I am Vortash sorry to say you have an engineers nightmare fault an intermittent or slow to show .. this requires bench testing to catch the fault as it happens .. it will probably need an oscilloscope to monitor the psu and an MMM and a multimeter .. not the type of stuff most people have around the house unless you are an electronics engineer sorry to say but this is one for the man with the van .... Regards Vortash

Posted on May 17, 2009

  • clive pearson
    clive pearson May 17, 2009

    there is the possibility that dry joints are your problem and yes it may even be an intermittent bridge rectifier diode assembly but it is more likely to be an opto ic or a voltage regulator transistor with the fault you describe .. it may even be the fly-back transistor as you say .. but it may also be the fly-back transformer and if this is the set I am thinking about with three cathode projection tubes then the fault could be on either one .. one way of testing it safely as you say it comes on again after 25 minutes is run it till it goes off then disconnect from supply and get a tin of freeze spray and gently spray each component one at a time till set comes back on do not do it with the set live the spray is wet based and will blow other components till it freezes.. and you will have found your faulty component .. this is an easier way to try it if you do not have engineering training .. wear a pair of household rubber gloves whilst doing this as the can sometimes touches things you don't want it to and they will protect you .. I have to repeat unqualified personnel should never attempt to repair electronic mains powered equipment for risk of death or injury ... Regards vortash .. PS stay away from the tube anode cap the wire going to the transformer it can carry up to 19,000 volts ..

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