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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

Posted by Anonymous on

  • Anonymous Apr 11, 2008

    How do I turn it on with all of the wires unhooked but the main wire?That,and how do I look for shorted voltage lines?What am I looking for?Nothing looks burned.I was thinking,where I don't get an error code from the power light,that maybe there is nothing wrong with the main boards,and the button board could be bad?Is the power light supose to flash green for a split second when the power cord is plugged in?What about the single click when the power cord is plugged in,and out?When the TV is working properly,does it click when it is turned on,and off ?What about only getting 120V on the wires from on the line filter board to the mainboard?Am I supose to get more?Any help is greatly appreciated.Thank You very much!



    Tyler

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1 Answer

Eduard P

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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.

Posted on Apr 10, 2008

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