Question about Samsung LA40R81BDX 40 in. LCD TV

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My Samsung LCD TV la40r81bd wont switch on. I have replaced batts in remote. All that happens is that there is a sound (like a popping switching on sound), but no picture or other sound. The bottom power light on the bottom right hand corner is flashing red...I have tried without the remote too. Also tried leaving it off, for hours then reconnecting. While I leave it I can hear the switching on sound intermittently...almost as if it is trying to switch itself on...Was working fine yesterday mrning!

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  • raynel Oct 02, 2010



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If there is a flashing red , it means that the protection circuits

have been activated,

There could be a communication error on the boards or

possible faulty components .

If you feel you can DIY , have the tools and equipment

here are initial things to do:


you will be checking for Power supply DC outs ( many )

just to insure each have enough to supply to other

stages on the board.

sample image ( not like yours but similar )

center is your sample power supply

Additional guide:


How to test MOSFET


I will post for more should you feel you need

more further assistance or clarifications

Posted on Oct 02, 2010


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If you want to DIY this TV you need to open the back cover of your TV 9BE SURE TO UNPLUG THE UNIT BEFORE SERVICING) Examine first the power supply section.using a voltage tester measure the output of it.
5v for the CPU board
12v for the sound amplifier
24 v for the inverter board/backlight.
if one of this voltage is missing then you need to repair first the power supply.measure first this voltages and post a message for further assistance.

Posted on Oct 02, 2010

  • Danilo Baraquiel
    Danilo Baraquiel Oct 02, 2010

    yes sir! It would be better to bring your TV to the service center because that problem requires a technical knowlege to do it.thank you for using fixya!good day!


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