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Sharp LC52D64U Support Question

Sharp LC52D64U Support Question

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Question posted by donallamerican on June 5th, 2012

Sharp Tv Lc-52sb57u Tv Won't Turn On But Opc Green Flashing Lights.

Service guy said its "probably" the (backlight) Main board. Can I order this and replace myself?

Current Answers

Answer #1: Posted by TVDan on June 5th, 2012 8:35 PM
This answer was accepted by the poster of the original question.
TVDan

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DUNTKE833FM05   MAIN UNIT

 

RUNTKA528WJN1

  INVERTER UNIT 1 (top half of screen)

 

RUNTKA529WJN1

  INVERTER UNIT 2 (bottom section)

 

RUNTKA530WJZZ

  INVERTER GND UNIT 1 (not likely the problem)

 

RUNTKA531WJZZ

 

INVERTER GND UNIT 2 (not likely the problem)

 

those are the part numbers for the inverters and the main.

If you are getting the "power LED" blinking once green, pauses and repeats, then you have a back light error. This could be one of the four inverter boards above or one of the many back lights (florescent tubes) inside the LCD panel (this requires a ew LCD panel, and it's too expensive to fix).

Sharp as a feature that when the back lights fail you can turn it back on until the count reaches 5 time, then the set will not turn back on. To allow the tech to test it, there is a back door way to restart it. Unplg the AC cord, press and hold the [volume down] and the [input] buttons on the TV keyboard. Plus the Ac cord back in and once the "power LED" turns green then release the buttons.

Although the troubleshooting procedures are not easy without proper electronic test equipment, you can do this in a dark room and watchin the screen to see if there is any of the lamps light up (these are horizontally mounted in a grid behind the glass LCD display). If one of these fails to light up there will be a band (darker area) across the picture. This will either be the bad lamp or the output stage of one of the inverter board. If it's on the top or bottom can narrow down which inverter board might have the problem.

I recommend a tech check it out for a estimate.


TV Dan

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