Re: SHARP motherboard version compatabilaty T-con

Thanks for the reply but I already have tried everything to adapt the board to the tv. I populated all the components on the other plug but it didn't like it (backlight powered on but after a few seconds the power led started flashing 2 long a and 5 short witch is the error for T-con) I even changed the firmware chip to the one of the old board but then it flashed 3 times and one short. I think this is because the ram and arm chip are different to the old ones so the firmware didn't run correctly. But now I changed everything...

Hi, I recently replaced my motherboard with one that had the exact same part number QPWBXF733WJN2 but it was version 2.03. The problem is that when I connect the board with the T-con I noticed that the connector is placed differently and the TV (sharp aquos lc-60le635e 60) will light up but not show any picture. The T-con version is 1.00. Does anyone know how to fix this?

Re: SHARP LC-60E635E no backlight and picture

I think the problem is with the Motherboard so I will try to get a cheap one with broken HDMI ports and try that.

Re: SHARP LC-60E635E no backlight and picture

I have measured the voltage on PS_ON (2.85v) and PNL_POW (1.random). The PNL_POW is a input from the Mainboard and seems to vary a lot, and the PS_ON appears to be to low i don't know for sure but in the other thread the PSU used the 5v to power on, the opto cuplers seem to run pritty low too 1-0.8v and i think they turn on with the PS_ON voltage.

Re: SHARP LC-60E635E no backlight and picture

I traced the switch to the PNL-POW pin of the PSU and its supposed to power on the regulator. I found a similar problem in this thread: ([url]https://www.badcaps.net/forum/showthread.php?t=49341[/url]).Re: SHARP LC-60E635E no backlight an...=49341[/url]).Re: SHARP LC-60E635E no backlight and picture

I traced the

Re: SHARP LC-60E635E no backlight and picture

Yes I meant open circuit thanks for saving me the disassembly of the panel, but it doesn't make a difference in voltage if I disconnect the LEDs its always something like 0.5-0.1 falling because of capacitance in the circuit. I found out something new in the manual by pressing the menu button the flashing LED gets more specific to whats the problem. Its 3 times long then one short flash. This apparently means: [COLOR="Sienna"]"Initial communication from the main CPU is not received.
(Request for the monitor...

Re: SHARP LC-60E635E no backlight and picture

I have tested the input voltage and it's at 13.17v seems to be fine but I just checked the resistance of the led connector for all 4 pairs in both ways and I get absolutely 0 resistance for what i am measuring the backlight circuit is completely open and the driver chips have open circuit protection. Is this maybe the problem? Also the TV does exactly the same thing if i unplug the LEDs but it doesn't care much about the absent Tcon ether if i unplug it . I don't want to take the panel apart unless I relay have to, any suggestions?...

Re: SHARP LC-60E635E no backlight and picture

Thanks for the quick response , I think I will measure the vcc next. But I don't think it will be a problem as the chips are connected to the 63v rail through a series of resisters, that lower the voltage to the ic's needed voltage. Is 63v a usual voltage for LED's? It might be to low which means the controllers wouldn't get enough voltage too but I already checked most of the components in the dam supply and it seems pretty steady.

Hello, I recently got a 60" LED Sharp TV. The problem is that every time I power it on it will just switch on the power LED and try to powerup 3 times (LED stays on for long switches off and then on again) after that it will flash the LED 3 times pause and flash 3 times again until I pull the plug. I opened the thing and took out the PSU, witch on this TV is a LED backlight circuit / PSU combo. Btw. I have also looked at the panel with a powerful touch to see if anything is displayed but its not. I have checked all caps, mosfets (main supply), optocuplers and diodes for defects all are working...

Re: New Members - please post your introductions here

Hello, this is Ed, love playing with all kinds of electronic gadgets . Hope I can help out in the BADCAPS Forum . Okay! One, two, three, four-or. Ed's gonna score more!