Sanyo DP42849 - No Power At All

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Actually, I can see it better in the pictures. That's definitely an "IC" there before the 800. I just can't see it so well without the magnification.

Also, while looking at the flow chart again, I see that at least 5V Stby voltage is expected before PFC is activated. I don't have that (that I can tell), but surely I must be checking it wrong if the green light is coming on.

Starting on page 35 there's a breakdown of the pins on that IC800 chip, for a different model chassis, anyway.

Pulled the main board out last night and checked the back of it. Looks brand new. Smells fine.

[tom66]

Re: Sanyo DP42849 - No Power At All

Yes, you have 5V standby, or you would not have power light.

So, what pin(s) do you want to check of IC800?

What is main board code (e.g. N7AF, N8AE...)

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

N7AE

I'm not really sure. I wanted to try and follow the directions on page 5, but I'm not sure what to do exactly. Or even if my IC800 is the same as in this SM.

*It's the same.

[tom66]

Re: Sanyo DP42849 - No Power At All

I will try and find schematic of your main board and check it is those pins.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Pin Info

[tom66]

Re: Sanyo DP42849 - No Power At All

Is that list for YOUR board?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

No, it's for the 00 chassis. I have 01.

According to ShopJimmy tho, if I'm reading correctly, they use the same main board, but not same power board.

http://www.shopjimmy.com/sanyo-n7ae-...-p42849-00.htm

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Main board in service manual for DP42849-00 matches up to my main board. I guess I just assumed that since the power board is different, the main board would be too.

[tom66]

Re: Sanyo DP42849 - No Power At All

OK, I'd check pin 48 (>3.6V if OK, <3.6V if error) and pin 23 (similar.) Do you need those pins highlighted?

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

OK, I'd check pin 48 (>3.6V if OK, <3.6V if error) and pin 23 (similar.) Do you need those pins highlighted?

These? (See photo).

How do I check? Norcal never shows it, he just does it. Do I put black to a ground and red to pin?

What should I set my meter to, DCV 20?

TV on? Plugged in?

[tom66]

Re: Sanyo DP42849 - No Power At All

Yes, that looks correct.
TV powered on, test while green light is lit.
DC 20V is fine.
Black probe on chassis.

[vinceroger69]

Re: Sanyo DP42849 - No Power At All

did you read this post 6 says it a main board fault too so hopefully your on the right tracks.
https://www.badcaps.net/forum/showth...=Sanyo+DP42849

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Okay, with black probe in a little hole in the chassis and red probe to pin 23:
0.69 when TV plugged in
0.69 when power button pressed

Pin 48:
0.46 when TV plugged in
0.78 when power button pressed

did you read this post 6 says it a main board fault too so hopefully your on the right tracks.
https://www.badcaps.net/forum/showth...=Sanyo+DP42849

Thanks. Yes, I've seen him post that in a few places. Hopefully he's right.

[tom66]

Re: Sanyo DP42849 - No Power At All

So, you have POWER DET fail. Need to look at main board schematic and come up with a list of check points.

[tom66]

Re: Sanyo DP42849 - No Power At All

OK, pictures of the following chips would be useful:

IC1660 - 12/15V to 9V - small 5 pin chip
IC1630 - 4V/5V to 3.3V - larger 5 pin regulator IC
Q1651 - local 5V - small 6 pin MOSFET
IC1670 (if present) - audio power - larger 5 pin switcher IC

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

I couldn't find an IC1670. Hope these are clear enough.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Well I found IC1670 on the board, but there's nothing there.

Weird. According to the schematic, it should be there. The board listed for my chassis has it missing, but the actual board I have has it there.

[tom66]

Re: Sanyo DP42849 - No Power At All

Can you check:
pin 5 of IC1660 = should be 9V
pin 3 of IC1630 = should be 3.3V
pin 1 of Q1651 = should be 5V
voltage across R1684 (may or may not be present: if omitted, test voltage across pads) near IC001. See attached.

[NihonNoir]

Re: Sanyo DP42849 - No Power At All

Can you check:
pin 5 of IC1660 = should be 9V
pin 3 of IC1630 = should be 3.3V
pin 1 of Q1651 = should be 5V
voltage across R1684 (may or may not be present: if omitted, test voltage across pads) near IC001. See attached.

With TV plugged in and power button pressed?

[tom66]

Re: Sanyo DP42849 - No Power At All

Yes.