820-00840 - No power. PPBUS_G3H 3.76V

[macRepairAmb]

Have this board that originally wasn't switch from 5v to 20v on PPDCIN_G3H. Troubleshot it down to U7000, replaced and PPDCIN_G3H now goes to 20v but no current draw. PPBUS_G3H is reading 3.76v. Any suggestions on where to go next?

 

[2informaticos]

Remove F7000 and check C7050 voltage.

 

[macRepairAmb]

C7050 - 2.7v
F7000(2) - 3,75v

 

[2informaticos]

Post U7000's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_VR1, SMC_RST*, AUX_OK, A/BMON.

 

[macRepairAmb]

P_IN - 20.5v
AUX_DET - 5.1v
SMC_RST_IN - 0.0v
VDDA - 5.1v
VDDP - 5.1v
EN_VR1 - 5.1v
SMC_RST* - 3.4v
AUX_OK - 3.4v
AMON - 0.0v (battery not connected)
BMON - 0.0v (battery not connected)

 

[2informaticos]

Check diode mode and voltage on SCL/SDA lines of battery bus.

Any history available?

 

[macRepairAmb]

SMBUS_BATT_SCL - 0.484/3.3v
SMBUS_BATT_SDA - 0.609/3.3v

Only info give was it failed due to static electricity. From what i guard, they may have been trying to replace the ssd card when this occurred.

 

[2informaticos]

Seems to have a problem with SCL line.
Remove D6950 and check again.

 

[macRepairAmb]

Same measurement. Though, D6950 did appear blown, has a hole through it. Went ahead and replaced it. Wondering if the smc was affected as well?

 

[2informaticos]

SMC, or U7000.
You must get same readings on both lines.