Sharp LC-52LE640U Error Code & Voltages

[Baldrick]

Hi, I've got a Sharp LC-52LE640U that has a black screen and the symbol is flashing 5-fast & 2-slow. According to the service manual, it's a "DET_PNL12V failure". I've read that this may not be a problem with the power supply, but with the main board.

When I plug it in, I'm getting 5V on pin 15 of the 24-pin connector. If I hold the VOL-DOWN & Input buttons when I plug it in, I get this (I can only get to the odd numbered contacts since I need to leave the 24-pin connector plugged in):

Pin 1 - 12V
Pin 5 - 13.1V
Pin 7 - 13.1V
Pin 13 - 3.3V
Pin 15 - 5V

After about 15 seconds, the LED starts to flash the code again and I lose the voltages.

Does this - as I'm thinking - tell me that the P/S is okay and the main board is bringing it down? Would it be worth it to buy a used main board for $75?

Any ideas?

Thanks!

[munirutech]

Re: Sharp LC-52LE640U Error Code & Voltages

send the image of the psu and let see how it look like

[Baldrick]

Re: Sharp LC-52LE640U Error Code & Voltages

Here's a pic I grabbed off the web. It's the same board.

[Baldrick]

Re: Sharp LC-52LE640U Error Code & Voltages

I just wanted to bump this back up to see if anyone had some ideas...

Thanks.

[truep]

Re: Sharp LC-52LE640U Error Code & Voltages

12V panel fail is usually either no 12V to tcon or a blown tcon fuse, the voltages look good. Check the voltage on both sides of the TCON and report back.