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820-00165 no power

K

Kyle93

Active member
Water damaged. Arrived with no light on charger. Replaced U7100 U5110. Reballed original SMC but no change. Also replaced SMC from donar but still no change. SMC_RESET_L 3.3V. There was no water damage in SMC area

PPBUS_G3H 8.22V
SMC_RESET_L 3.3V.
PP3V42_G3H 3.42v

Should SMC be replaced again from another donar or should something else be checked first?
 
2informaticos

2informaticos

Administrator
Staff member
Post diode mode and voltage on SCL/SDA lines of battery bus.
Check if R7100 is good.
Did you try SMC bypass mode?
3V3_S5/SUS present?
 
K

Kyle93

Active member
Second SMC replacement was no change

0.490 490 SCL SDA lines 3.4V 3.4V

r7100 good

have not tried SMC bypass since there is no light on charger

3V3_S5 3.3V

3v3_sus 0.108V
 
K

Kyle93

Active member
Yes SMC_RESEL_L is a steady 3.4V

Replaced SMC again from another donar but still no change.

Replaced again once again after that (4th SMC now) but this time from a board that had other issues but still gave a green light. STILL no change or light. Something else must be causing SMC not to function.

Any other ideas?
 
2informaticos

2informaticos

Administrator
Staff member
Check the 4 SMC_Txx lines on page 37.
Also check PP1V2_S5_SMC_VDDC presence.
Diode mode to ground at SMC_PM_G2_EN?
 
K

Kyle93

Active member
Removed SMC and continiuity to SMC_PM_G2_EN and U7501 is good. Soldered SMC back but same results.
 
2informaticos

2informaticos

Administrator
Staff member
Remove R8140 and check again SMC_PM_G2_EN voltage.
Did you try to start in SMC bypass mode?

Be sure not short on 3V3/5V_S5, or other rail.
Is SMC detects a problem, can pull dowsn SMC_PM_G2_EN for protection reason.
Check for pulse on it (and also 3V3/5V_S5) when you connect the charger.
 
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