820-4924 - Slow, SMC was replaced.

[bjf]

I have a board that works normally except it's really slow and gives these errors:
"There may be an issue with the System Management Controller (SMC) Reference Code: PFM006"
"There may be an issue with the power management system. Reference Code: PPN001."

The SMC was definitely replaced. Any ideas what might be happening? Is this the result of an incorrect SMC being installed? Wrong year maybe?

 

[dukefawks]

Verify if both voltage sensors are working Q5480/90. Check SMC version in "about this mac"

 

[aprendiz]

Check te version of the SMC firmware.....

 

[aprendiz]

Ups! you beat me Duco... lol

 

[bjf]

2.28f7

Seems like the right version from what I can tell.

Q5480 and Q5490 are both passing 12.6V through and the voltage is being dropped down properly to 2V for the SMC.

 

[dukefawks]

See if iStat menus picks up a sensor that reports weird values. Was BIOS ever touched?

 

[bjf]

Yes, definitely. Someone replaced the SMC, or at least did extensive work on it. No issue with iStat. Everything normal.

 

[dukefawks]

Make sure to visually inspect all current sensors (INA21*) and after that I would first put a known good SMC on there.