Sanyo DP42848 No Backlights

[landyboy]

Picked up a Sanyo DP42848. Set turns om and has sound. I can see a picture with the flashlight test. So it appears the backlights are not coming on. I have tested the PS and here is what I have:
24V 23.89vdc
SGND 0
12v 12.09vdc
SGND 0
5v 4.99vdc
SGND 0
PSON 4.88

Also have 23.87 volts on the 24v pins where the inverter board connects to the PS

I noticed two very slightly bulged caps on the main board.

[capkid]

Re: Sanyo DP42848 No Backlights

I don't see the bulging caps on the main board. These TVs are notorious for bad CCFLs; I picked up one of these for free myself awhile back. I wouldn't touch Sanyo LCD TVs: https://www.badcaps.net/forum/showthread.php?t=23280

[kevinm34232]

Re: Sanyo DP42848 No Backlights

Did you check 2 white 4A fuses on inverter board yet?

Not sure if you can bypass a bad bulb in this design like in the this video, maybe someone else would know..

https://www.youtube.com/watch?v=oE6K4xBVweA

[landyboy]

Re: Sanyo DP42848 No Backlights

Kept searching the forum after I posted and found another thread. I thought I checked all the fuses but missed one on the main inverter board that was bad. Replaced and now it works!!

[landyboy]

Re: Sanyo DP42848 No Backlights

Kevin it was actually the small fuse marked 15 on the main inverter board.

[kevinm34232]

Re: Sanyo DP42848 No Backlights

OK, now run it for awhile before you put it back together to make sure no other underlying problem..

[landyboy]

Re: Sanyo DP42848 No Backlights

Will do thanks!

[budm]

Re: Sanyo DP42848 No Backlights

Very common failure for the CMO inverter board, the fuse is for powering the PWM IC.