Question about LG 62SX4D 62" Television

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My lg 62sx4d-ub will not turn on. You push the power button, the ballast clicks, then the leds begin scrolling white. Eventually the lamp led flashes red and it shuts back down. I've changed the bulb already, that didn't help. Ballast? Power Supply?

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I just had the same problem. Came down to a bad cap on the main power supply board C871. This is the first filter cap after the diode on the 6V supply. Funny,, the schematic calls for a 25V part,, however this one was rated at 16V :-)

Replaced with a new one,,, all is good to go!

Jer in Hayden

Posted on Oct 26, 2010

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  • Jonny Boy84 Oct 28, 2010

    Jerlong, I am having the same issues. How did you check the C871? Mine seems to be testing okay, yet the transitor D871 has dead shorts with the OHM meter.

  • Jerlong Oct 28, 2010

    Jonny Boy84, I do not have a capacitance meter,,, so I just replaced it. The symptoms were pointing to this cap,,, so therefore the change. As far as your transistor,, if it is a true bipolar transistor, it looks like you have found your culprit (if it actually checks bad out of circuit). Some FET transistor measure shorted though (depletion mode FETS) so be wise.

    Jer

  • Jonny Boy84 Oct 29, 2010

    Jer- C871 was bad. Replaced now everything is good to go!

  • db554 Feb 08, 2011

    how did you change this part and where do you purchase it? Thanks for any help.

  • Jerlong Feb 09, 2011

    Soldering iron to de-solder with solder ******. New one I found in a failed computer power supply :-) You can buy new ones though, I would imagine that Radio Shack would have one that would work. Just be sure the voltage rating is at least 50% more than the supply voltage.

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