Question about Sharp AQUOS LC-45D40U 45 in. LCD Television

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Sharp LC-45D40U Won't Power On! Need Help!

When I plug it in,I can hear the two relays on the mainboard click,and the power light flashes green for a split second only once.Nothing else.No other colors on the power light,or a hint of a picture,or backlight lighting up.When I unplug the TV,the two relays click again.I have tested all of the capacitors on the main power board with an ESR meter,and they all seem alright.The power button board seems to tests alright as well.Nothing looks burned,or broken.What I think will help me get started beyond what I have already tested is the following.Am I supose to get more then 120V on the wires that go from the line filter board to the main power board?What does the line filter board do?And are the two relays on the mainboard supose to make a single click when the power cord is plugged in,and a single click when unpluged,or are they only supose to click when the TV is turned on,and off?Are there any know problems with this TV?I have already tried another IR board,but that didn't help any.I was thinking about getting another power button board,but everything seems to test alright on the one I have.Any help is greatly appreciated.Thank You very much!


Tyler

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  • Anonymous Apr 17, 2008

    At times the TV powers on instantly and other times we hear a series of clicks and the green light flashes, may take hours to get it up and going, have unplugged and replugged, cannot shut power off on the side of the TV. HELP, this TV is only 10 days old. thanks John

  • jhtriplett Aug 25, 2008

    I am having the same problem with a Sharp LC32SB24U. Has anyone found the solution?

  • Tyler Bearor Sep 29, 2008

    I did end up getting mine fixed.I had to replace the mainboard.Being only 10 days old,wouldn't yours still be under warranty?Couldn't you just exchange it at the place you bought it from?How many times does the light flash?I hope this helps.Thank You very much!

    Tyler

  • creative40 Feb 17, 2009

    My television doesnot come on.However the green power indicator light keeps on continuously flashing steadily.
    It is like it is some sort of sleep mode.
    Please help

    creativeconcrete_84@hotmail.com

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Problem main power board,voltage aut ,not good.But problem transistors short.I am change transistors. But hundayi plazma not working.

Posted on Nov 04, 2013

CHECK THE FUSE NUMPTY

Posted on Aug 12, 2008

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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
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If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

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No picture, when powering up the light will turn yellow, them the t.v powers up and can hear sound but no picture, and then hear a click and light flashes green.


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Sharp LC-45D40U Won't Power On! Need Help!


If doesn't give error code most probably is something wrong with 5 and 3.3 volts lines. Check first the power supply and try to start the tv with all connectors removed. Let only the one between main pcb and power supply. Look for shorted voltages lines.

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