Question about Sharp Aquos LC-45GD4U 45 in. LCD HDTV

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Aquos LC37D40U Blinking light and won't turn on

I was reading some of the others, and someone mentioned doing a reset by holding down a button while plugging it in.. how do you do that reset exactly? My TV won't do anything right now except blink that stupid power light.

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  • fosterr Jun 08, 2008

    I have the same problem and did the diagnosis as described. I am getting constant flashing of power light at 1 sec intervals. No "K" came on but the power did and then shut off again with a "click".

    How difficult/espensive a repair am I in for?

  • playa2126 Mar 03, 2009

    How much the board cost?

    The lights blinking and won't turn on LC37D40U

  • mrenteria007
    mrenteria007 Sep 19, 2013

    I had to replace the Main board of the TV, just be sure to get the correct one for your set, take the back cover off and look at the label affixed to the board and google it, I have found the one that I needed on Ebay that worked for me. After replacing the board Voolaa I now have a picture.


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  • 53 Answers

The power light is an error code that tells me exactly what is wrong with the TV. Count how many times the POWER led flashes per second? (Dont worry about the OPC led)

1x per second (constant steady blink) = bad inverters/lamps
2x per second = bad power supply
3x per second = bad main board

If its 1x per second, try doing the factory initialization to get the TV back on to confirm a bad lamp/inverter.


  1. unplug tv
  2. press and hold at the same time “Vol –“ and “input” button on the TV set.
  3. while holding those buttons, plug the tv back in
  4. the tv should turn on by itself, keep holding the buttons until the letter “K” appears. Then let go.
Once the TV turns on, take a look at the screen. Does it flicker then shut off? Or do you hear a buzzing noise from the right edge of the TV? If so, then you have bad inverters or lamps. Once youre done, unplug the tv to get it out of the service menu.

If it is 2x per second or 3x per second, then those boards are just bad and they need to be replaced. There isnt anything you can do right now to fix it.

Posted on Mar 28, 2008

  • mrenteria007
    mrenteria007 Jul 24, 2012

    Hey Jedikn1te, I tried you solution and could not get the TV to come on line, the TV just blinks continuiously, any Idea's Please advise when you can, thanks.


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  • 18 Answers

Replace the Main board corrected the problem........

Posted on Sep 19, 2013

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There are probably ways of really messing up your set if you do the wrong thing from the service menus, so do this at your own risk:

To enter service menu, make sure the set is plugged in but turned off at the power button on the top of the tv,
then while holding both input button and volume down button, push the power button. Within about 5 seconds, the set will power up keep holding the input and volume down buttons until a small "K" appears in a box on the left side of the screen. Then press and hold the channel down and vol down buttons at the same time to enter the service menu.

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Not sure wether the grey background settings apply, but for entering the service menu it does.

I think to get out of service mode you have to disconnect the TV from the mains and wait about 30 seconds.

it's some time since I used the service menu on the Sharp Aquos but I do remember you can do a full reset to factory settings as well as turn on, off and reset certain system settings too you will just have to experiment with the remote keys, I think the colour fastext key access different menu levels etc but as I said I am unsure, at least this procedure will get you there so you can try for yourself.

Hope this helps

Please come back to let me know if the service menu procedure works for you.

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