Question about Sharp LC-20AV4U Television

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My sharp LC-20AV4U tv did not turn on when i plugged it in

I moved the TV from the bedroom to the living room, so I needed to plug it back in along with the DVD player. I plugged the TV in first and when I plugged it in – I was behind the TV at the time - I thought I noticed a flash, not sure where it came from exactly on the TV – but must’ve been the screen. I didn’t think much about it at the time as it didn’t seem that big and I thought it might’ve just been a flash from the outlet when the plug entered.

I then tried to turn on the TV – but nothing happened – no sound, no click, no pop. Nothing. Tried unplugging it, and replugging it, moving to another outlet etc – still nothing. I then read online that sometimes as a safety feature, the TV will shut itself off - and if you leave your set off and unplugged for 6-8 hours it will reset – allowing you to turn it on again. So I waited until the next morning and then plugged it back in and tried it again – still nothing.

So I took off the back of the TV and found that the little 4W 125V fuse was blown. I didn’t see any other noticeable damage, so I picked a few new fuses up at Radioshack and replaced it, then plugged it back in. As I plugged it back in – I heard the fuse blow – sizzle,pop. I tried the power button – again nothing.

So I guess something is causing the power to come in at the wrong wattage/voltage and thus cause fuse to blow – powerpack, voltage regulator or whatever.

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  • idil578 Dec 18, 2008

    many thanks. i will try to get a multi meter & do as you suggest. will let you know the results. thanks!

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The fuse is blowning because most likely when you plugged it it, it took a power surge. And the power surge blow a proection diode. As long as you opened it up... in the power section you will see a bunch of diodes. Get a multi meter and check these diodes out. Besides the diodes... you will see a transformer.... if you are looking at the unit with the fuse to the left... then look to the right of the transformer... you will see a transistor on a metal heat sink... that could have blown also.. if that did... then you should also check the diodes just on the other side of the heatsink too.

Good luck

Posted on Dec 18, 2008

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