1 
1 60" Sharp Aquos Problem - Won't turn on!
My son brought me his Sharp Aquos (Model LC-60LE644U) TV that wouldn't turn on (he said, previously, it would work for a couple of days and, then, wouldn't turn on again, for several days. Now, it doesn't turn on, at all). The red LED is lit. From his symptoms and checking other posts, I thought it was a bad Power Board, so I ordered a replacement. It didn't work... and it's doing exactly what it did with the previous Power Board: Doesn't turn on, at all... BUT, when I UNplug the cord, the panel's backlight flashes for a second. Those symptoms don't point to the T-Con or FRC boards, but lead me to believe it's the Main Board or the panel, itself. I could use a second opinion
crwdns2934109:0crwdne2934109:0
crwdns2889612:0crwdne2889612:0
1
2,4crwdns2936485:0crwdne2936485:0 
crwdns2947414:01crwdne2947414:0
THANK YOU for generously taking time to answer my question and guide me through the diagnosis. The schematics were invaluable.
As it turned out, I found two voltage issues on the Main Board... probably caused by loose soldered connections. Because the soldering points were so small and close together, I chose to replace the board.
That did the trick. The TV is now working and the picture looks like new.
Thanks for your help.
crwdns2934271:0crwdnd2934271:0 Philip Samuels crwdne2934271:0