View previous topic :: View next topic |
Author |
Message |
Guest
|
Posted: Thu Sep 17, 2009 4:02 am Post subject: Sharp LCD tv: LC42D72u |
|
|
It has the green opc/power flashing light problem. The power and opc light flash 2x together (1 second) and then the opc by itself for 3 flashes. Looking it up online suggests it's a power board problem. When the unit is plugged in it immediately clicks and about 2 seconds later it does it again.
If I press the channel- and volume+ (service mode) I can see the backlight for the screen but no main display (no letters or text at all). When I do this the main board has a solid and a flashing red light (didn't look up the board or light).
I replaced the ps-board (LC605-4001CC,RDENCA184WJQZ) and the issue is still happening with the replacement board. Both original and replacement boards look good, no bulging caps, no cold soldier joints (re-tinned the ends of the original just to check). If my eyes were what they were years ago I'd check the etches better... but they all look good as they do against a bright light looking through them. My thought is this would be inverters since I can get the backlighting in service mode, but no more. Without knowing what the outputs should be I really can only guess. |
|
Back to top |
|
|
Dan the Tv man Guest
|
Posted: Sat Oct 03, 2009 4:51 pm Post subject: LCD/no pic |
|
|
If the inverters were bad you would probably have sound.I would say that the panel is overheating and shutting the power supply down. |
|
Back to top |
|
|
minnie
Joined: 18 Aug 2005 Posts: 2880 Location: Hell
|
Posted: Sun Oct 04, 2009 4:12 pm Post subject: |
|
|
Pull the inverters off and find out which contact is bad. It's plastic tabs that stick up with a metal strip in it the strip carbons up and shuts the set down. Sand paper of a fiber pen cleans the strip. I just did one where the contact was so bad it ate through the inverter board! |
|
Back to top |
|
|
|
|
|
You can post new topics in this forum You can reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
eServiceInfo on FB -
Service Manuals Free Download -
Service Diagrams
Free TV Schematics Download -
HARDW.net -
Pinout Master -
Jabse Service Manual Search -
Jabse.InK -
onTap.bg
SnimkiOt.com -
Poblizo.com : пътешествия
Latest Service Manuals :
KX-TD290 PANASONIC • bd677a Inchange Semiconductor • Aspire 5100 acer • 3-1-5-300 Rolsen • VVX2000 DE`LONGHI • Archicad Graphisoft • Adj EP4000 023 Minolta • Whirlpool AMW 755 IXL 858775501911 en151 • 5991-3196EN Gauging Temperature Accuracy • GPF12DE TX-P42U10B TX-P42U10E panasonic •
|