Question about LG RU-52SZ51D 52" Rear Projection HDTV-Ready Television

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46" RCA, CTC169PA, pulsating power supply.

I have a RCA 46" rear projection set that I hear pulsating when plug up. I measure the 5v standby voltage it pulsate between 0 and 3v. The primary power regulator transistor is ok and horz-output transistor is too. I replaced main regulator caps., IC, and transformer. Can anyone help.

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HV Splitter!

Posted on Feb 19, 2008

  • Neil Bowman Feb 19, 2008

    Hi voltage splitter.



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Technosonic LCD3251 TV remains in standby

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My mitsubishi ws65807 remote stopped working and also the front console buttons would not work, couldn't even turn unit off. Unplugged tv and plugged back in. Green light blinked 2-3 times and then...


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Also, inside the front, view the PC boards for CRT fluid leakage. The fluid is (originally) clear and is slightly thicker than water. Any fluid whatsoever, even a drop, can cause damage to the PC board. The fluid will cause any dust in the set to discolor; this may make it easier to spot (please look very carefully).

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If all these are good, then the next step is voltage measurement of the standby power supply. I will pause here and wait to hear your results.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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More than likely it has bad solder connections on the circuit board. You could try tapping lightly on power supply/deflection boards to see if it makes contact. Usually I find bad solder on those right under where the power cord plugs in, on the bottom of the board. If you have a soldering iron and solder you could save a few hundred dollars in repair costs, but use caution and make sure all power to set is disconnected. Maybe mark each plug as you disconnect them. Hope this helps. Good luck, Russmann.

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1 Answer

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This looks like a problem with the High Voltage or switching power supply section of the TV set. What you need to do is to measure the voltage from the HV transformer to the Anodes of the CRTs with a high voltage probe, and check the voltage output of the switching power supply. What may have happened is a component may have shorted out causing an over-current condition with is triggering the shutdown circuit (These are the relays you are hearing). I would check the Horizontal Output transistor, and the components in that section of the TV.

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I hope this helps,
Thank you,

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1 Answer

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