820-00165 No SLP

[bjf]

Okay, here are those measurements:

1. .584
2. .497
3. .565
4. 0
5. .526
6. .526
7. .575
8 .413

 

[dukefawks]

If this is with chip removed that all seems fine. I am out of ideas on this one. Maybe corrosion under SMC or CPU?

 

[bjf]

Yes, that was with the chip off. Thanks, I'll keep digging. Could this just be a bad ROM chip or bad programming? And do you know if the fan would spin up without an SPI ROM chip on it?

 

[dukefawks]

Without ROM it will power cycle on/off. I doubt the ROM will be bad <1%. Corrosion somewhere......

 

[bjf]

Ok, got it, thanks. I'll work with that and see what I can find.

 

[bjf]

Ok, so I had decided to let this one go, but then when I was using it as a diode-measurement reference for another 00165 board I noticed that U1950 was mangled and had some bad diode measurements. I replaced it and now my 3V42 line is at about 7V. Any thoughts about this? The diode measurements on U1950 all match a good board now.

 

[dukefawks]

U1950 cannot affect 3V42. No idea what is going on.

 

[bjf]

It had no 3V42 problem before I switched that. I replaced U7090 and it's still at 7V. I guess I'll give up on this again. No time for extended battles.

 

[dukefawks]

The original board in this thread had 3V42 or it would have been totally dead. No idea what board this is then....

 

[bjf]

It did have 3V42. It's the same board. It was fine until I switched out U1950. Something changed in the 3V42 line when I did that. Either way, moving on.