Re: Sanyo DP42848 sound but no picture

It looks like my biggest problem now is finding where all the screws to this thing are. It seems that the package of screws to hold the case together and the base to the case have come up missing. Lovely.

Re: Sanyo DP42848 sound but no picture

Yeah, I already did that. It spikes about 50mA when powered on and stays about 5mA when running. I don't have the exact numbers in front of me.

Re: Sanyo DP42848 sound but no picture

Alright guys, I got it! On the main inverter board, look at the power in socket. Directly below it is an SMD fuse that I missed, which showed no continuity (I was testing the large fuses next to the connector, which were good).

24v on the input, 0.00 on the output. I grabbed a scrap piece of CAT5, stripped a single wire to make a jumper and powered on the TV. With the fuse jumped, the backlights power on and stay on. I'm going to see if we have on of those fuses in stock, or if I can solder a different style (same rating) in it's...

Re: Sanyo DP42848 sound but no picture

From what I've read, everyone that's experienced the 2-seconds then black issue has had burnt bulbs, and disconnecting K8L keeps the backlights on (K8L is the error sensing circuit I think I read?).

The backlight on this never powers on at all, even when K8L is disconnected. What should I see coming out of the inverter boards? I'm sure we have meters here capable of high voltage.

Re: Sanyo DP42848 sound but no picture



I checked those posts regarding the K8L connector, I do have the service manual from that link.



No, they don't....

Re: Sanyo DP42848 sound but no picture

I forgot to list my ohm readings across the inverter board transformers, tested on 20k setting.

Primary PCB:
Inboard transformer testing to pin 10:
1: open
2-7: 8.88
8: .02

Inboard transformer testing to pin 9:
1 & 8: open
2-7: 8.85
8: .02

Outboard transformer testing to pin 9 & 10:
1: open
2-7: 8.88
8: .02 to pin 10. Open to pin 9


Secondary PCB:
Inboard transformer testing to pin 9 & 10:
1: open...

Re: Sanyo DP42848 sound but no picture

Yeah, I've gone through a bunch but not all. The ones I've read everyone experienced a couple seconds, then black. This one doesn't do that.

I've repaired three TVs in the past year by myself by replacing the bulging/leaking capacitors, but this one seems to be a bit beyond that.

I have a Sanyo DP42848 TV that I purchased for $50 because the display does not power on. This is a backlight or inverter problem from what I can tell. It turns on, you have sound, everything works but you can only see the picture with a flashlight. The inverter PCBs are getting 24v from the power PCB. I've checked the fuses on the inverter boards and they are good.

I've read a few threads concerning this model TV here on the...