[SOLVED]820-2850 weird charging problem - Shorts DC_IN when batt is connected.

[dukefawks]

PPBUS voltage?

 

[george-a]

with magsafe only: 16.4 to 16.5V
with battery only: 11.9 to 12.0V measured at F7040

 

[george-a]

PPDCIN at F6905 is 16.8V, then PPBUS_G3H is 16.4-16.6V at F7040. What do you mean?

 

[george-a]

thats what happens when you miss the basics.. thank you dude. problem solved. note that I missed two things. one the ppbus_g3h correct value and also the short at Q7030 which I measured. need a holiday.

 

[jadao]

Glad you fixed it. What was tricky I think in your case, is that the board worked with ppdcin on ppbus_g3h. Usually when the fan spins we don't give a shit about PPBUS_G3H
So I learned that a board at least 820-2850 could work with PPDCIN shorted to PPBUS without battery.
Hope your battery and sense resistors are still ok.

 

[george-a]

yes and I think that is the reason I oversaw the PPBUS_G3H value - my brain played a dirty game on me. Everything is great so far. thank you again buddy.