820-01598 5v

Kyle93

Active member
Arrived with liquid damage primarily in U6903 area. Replaced U6903 PPBUS_G3H 12.30V Meter is cycling on and off to 5v 0.25

PP3v3_G3H_RTC 3.3v

PP3v3_UPC_XA_LDO 3.3v

PP3v3_UPC_XB_LDO 3.3V

PP1V5_UPC_XB_LDO_CORE 1.5V

PP1V5_UPC_XA_LDO_CORE 1.5V

PP1V8_SLPS2R 1.8V

Checked on another mac and its currently not in DFU mode. No liquid damage anywhere around U3200/U3100
 

2informaticos

Administrator
Staff member
USB-C ampmeter goes on/off, or just current indication varies 0-0.25A?

Check if all AWAKE and SLPS2R voltages are present; the small coils around U7800.
If yes, it should go into DFU.

G3S and SSD voltages come on?
 

Kyle93

Active member
USB-C ampmeter goes on/off

all AWAKE and SLPS2R voltages are present

0V G3s and SSD voltages
 

2informaticos

Administrator
Staff member
The mentioned onboard voltages fluctuates at same time with USB-C ampmeter?
Check what happens connecting charged battery.
 

Kyle93

Active member
Yes, onboard voltages fluctuates at same time with USB-C ampmeter.

When a battery is connected, the meter does not come on at all, if it does its only for 1-2 seconds. Meter is on around 10 seconds without battery.
 

2informaticos

Administrator
Staff member
There must be something more affected by corrosion.
You can't enter DFU mode if USB-C voltage cycles on/off.

What voltages do you get connecting a charged battery?
 

Kyle93

Active member
I do not have a spare charged battery for this model. Any other suggestions or just order a battery for this repair?
 
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