Sunday I decide I need to take care of this and stop stalling. I order the part from MCM and held my breath. It came on Tuesday. I opened up the AVC and took out the old part. It does have a brown discoloration on the underside but it looks more like a stain than a burn. Anyway, I replace the part (that is tremendously easy, btw) and plugged it back into the TV. Back alive it came. Tremendous joy filled me, as if it hadn't turned on I was stuck.
One other note, there is another ebay auction for the AVC:
I'm guessing it doesn't work and the guy can't test it, but if someone is stuck and the board replacement didn't work, it might be worth getting this one (as discounted as possible) and trying the board in it.
Anyway, great thread, you saved me from having to junk my not quite working TV for a fraction of the cost of a new TV. Thank you.
My AVC died about 1 year ago...nothing happens when I hit the power switch, so I think I have a different problem than the WSOD. At the time I orderd a new board and it didn't make a difference. I got another AVC off of eBay that the seller said was working, but when I plugged it in and powered it on it gave me the same results as my original AVC...nothing happened. In both cases I didn't have the AVC hooked up to the panel. Does it need to be connected to turn on?
I posted this in another spot on the forum recently, but am posting it here as well in case anyone here can help.
My Sharp Aquos LC-45gx6u stopped working and the power light, which we all know is usually blue, is now blinking red. Just 2 red blinks. The system tries to start when I press the power button, but the panel never quite comes on. I do not get the white screen, just a dark screen.
Since I've replaced the DC/DC converter board in the AVC before, I just decided to try that trick again hoping that was the issue. No luck. Still 2 blinking red lights. From what I remember from the last time, the blinking lights were a more complex pattern.
So, I checked the service repair manual and discovered that it's most likely a power supply issue. The troubleshooting chart indicates to check IC4804 and IC4807. After wading through the numerous wiring diagrams in the manual, I located IC4804 and IC4807 in the top LCD controller PWB which is in the panel itself, not the AVC box. So, I replaced the top LCD controller board PWB which contains both IC4804 and IC4807, but no luck. Still, 2 red blinks from the power light.
Here's the part I can't understand. The whole thing works in "technician mode." I hold input and volume down on the panel while pressing the power button and it works normally except for the "K" displayed in a box on the left side of the screen. I can get rid of that by pressing the reset button on the front of the AVC. That button must reset the system without disrupting the power, because the whole system will work normally, until I turn the power off. Then I've got to start in "technician mode" again and press the reset button again.
Since I can get the picture and sound to work normally using the steps above, I think there must be some sort of complex start up sequence between the AVC and the panel which is reporting an error which causes the whole thing to shut down. The "technician mode" must bypass some part of that sequence. If I knew what that was I could possibly isolate the problem.
Can anyone help me figure out what to try next?
BTW, here's a link to the service manual...
Purchased the PS board from MCM Electronics for about $150 shipped, 15 screws and about 30 minutes later I'm back in business. Panel now fires right up without issues.
By the way, my old PS board showed no hot spots nor burn marks.
Thanks to everyone who posted here, saved me a few hundred $$$ not having to purchase a new panel.