Sanyo DP42840-01 Dead No Standby

[kevinm34232]

I can't figure out what's wrong with this board. There is no 5VSTBY. I have 170VDC on the main caps. No VCC to IC601. Replaced IC601 and IC602, still dead. Checked all the resistors and diodes in the area that I can find. Any help?

[kevinm34232]

Re: Sanyo DP42840-01 Dead No Standby

This one opto D607 that is reversed, is part of a AC DETECT circuit?

[CapLeaker]

Re: Sanyo DP42840-01 Dead No Standby

So you got no 5v on that ribbon connector on the bottom right? Can we have a pic of that (pinouts)?

[CapLeaker]

Re: Sanyo DP42840-01 Dead No Standby

pictures are to blurry to read anything off.

[kevinm34232]

Re: Sanyo DP42840-01 Dead No Standby

Here you go

I also found this older thread. But again, no VCC on pin 5 of IC601.

https://www.badcaps.net/forum/showth...ht=sanyo+ic601

[kevinm34232]

Re: Sanyo DP42840-01 Dead No Standby

BTW SM is available here with power schematic on page 47

[cliff_hootarski]

Re: Sanyo DP42840-01 Dead No Standby

Check R606,623,624,625 for proper resistance.

[kevinm34232]

Re: Sanyo DP42840-01 Dead No Standby

R606 reads about 1.4 ohms
R623,624,625 each read about 540k ohms

The 170V is getting to pin 1 of T601. But no VCC. Should I have voltage on the FB pin?

[budm]

Re: Sanyo DP42840-01 Dead No Standby

What Voltage do you have on pin 2 (Brown out protection)?
Notes: Negative leg of the main filter cap is the GND for your meter.
Also check those 1M resistors R607, 608, 609.
The startup Voltage on VCC (pin 5) is 15.3V but it will not startup if the Brown out is detected.

[kevinm34232]

Re: Sanyo DP42840-01 Dead No Standby

The voltage is 6.3V on the BR pin.