Question about Sharp Aquos LC-20B4U-S 20 in. LCD EDTV

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Wont power up

The power went off in my house for a few minutes. Everything is working fine except for my Sharp Aquos. Checked the power supply cord with a mulitmeter and that seems fine. I wanted to open the back and see if it's a fuse, but since I don't know anything about Televisions, I'm afraid I'll touch something and electrocute myself. Any idea or advice? Can I safely open the back of the Lcd without killing myself?
Thanks!

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  • Chris M
    Chris M May 11, 2010

    Contrary to popular belief, the new LCD's are much simpler and much easier to work on than the old TV's, they're also much less dangerous. There should be a few screws on the back and pressure clips on the perimeter of the screen. That should free the back cover and you can take a look inside. There should be a 120VAC fuse right off the cord and a few fuses on the boards themselves.

    There really should be only 3/4 parts in there:
    Power supply Board
    Tuner/sound/amplifier/speaker
    LVDS/Display board
    Inverter (runs the backlights, this is the only place to be worried about high voltage, it will discharge extremely quickly after disconnecting it, just watch out when it's powered on)

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  • Sharp Master
  • 1,667 Answers

If you open the TV set and find that the fuse is blown, it is possible that there is a defect in one of the power supplies. It is possible that the fault is the main power supply or a backplane supply.

When replacing the fuse and if it blows again, this means that there is a short. The cause of the short must be serviced to return the set to normal operation.

Jerry G.

Posted on Apr 12, 2008

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