Question about Sharp Aquos LC-37G4U 37 in. HD-Ready LCD Television

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LC-37G4U Power Light Is blinking on front of TV will not power up. Control Modual and TV have been unplugged and re-plugged in after 5 min and still no solution.

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  • ryan_grennes Sep 04, 2009

    When I hit the power on the remote the TV power light will stay lit for 4 seconds and then starts to blink red continuously.

  • ryan_grennes Sep 04, 2009

    When you say unplug all internal components what do you mean.

  • ryan_grennes Sep 04, 2009

    i was told to do a hard reset by unplugging all external and internal components, what internally would i need to unplug? or any other suggestions

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3 Answers

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The power supply should be tested with voltmeter to see if it is working correctly. The capacitors in the power supply nowdays have extremely high failure rates due to cheaper parts.
You can purchase a service manual and a capacitor tester to test

Posted on Sep 04, 2009

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LC-37G4U seems have either bad power supply or defective back light inverter board that causing no power problem.
In my opinion qualified TV tech is required to identify is it either power supply or back light inverter board by testing output volts of power supply board that goes to back light inverter board (approx 24 DC volt)

I would recommend to download service manual copy for small fee from HERE if you are trying to fix it by yourself and Power Supply and Back Light Inverter boards are available in Shop Jimmy.
Click on above links to get price info.
Thanks.

Posted on Sep 04, 2009

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Have you tried a hard reset. In a hard reset, you have to de-attach every part which is attchable ( internal and external ). This will solve any hardware issue. Also check the internal wiring.

Posted on Sep 04, 2009

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1 Answer

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1 Answer

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Ok This is how to troubleshoot the TV, there are lights on the front and you are mainly concerned with two of these lights (the power light and the OPC light). I) If non of the lights come on then this is a AC Power failure (There is a loose connection or you need to check the Power/Inverter unit or the Main unit) II) If the power light is blinking at a rate of one blink per min and the OPC light is off (then there is a CCFL backlight problem) III) If the power light is blinking at a rate of two times per min and the OPC light blinks at a rate of one time per min (13V/UR10V failure you need to check the Power/inverter board or the main board). IV) If the power light is blinking at a rate or two times per min and the OPC light blinks at a rate of two times per min (3.3V Main Failure check power/inverter board or Main board). V) If the power light is blinking at a rate or two times per min and the OPC light blinks at a rate of three times per min (UR6V failure check power/inverter board or Main board). VI) If the power light is blinking at a rate or two times per min and the OPC light blinks at a rate of Five times per min (Panel 5V failure check LCD control unit or control panel).

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2 Answers

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It can be the power supply is sensing short circuits in the power supply itself or in the backlight inverter board, those are the two areas you need to inspect.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

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1 Answer

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This same thing happened to me, but not until I fiddled with all of my remotes, trying to see if it was an input issue, battery issue, etc. I finally unplugged the tv from the wall and plugged it back in. Nothing. Then I went to take 5 minute ****. When I finished, the Power & OPC lights were blinking, and out of sync. I pressed the power button at the top of my TV and got a picture.

Word.

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