820-01598 No Power

[bls951]

This is a warranty repair that initially had liquid damage around Q8100, the rest of the board was clean. After cleaning up that area every worked great until recently. It did have a bad U7800 when it came back a second time. U7800 was causing all the slp, wake, g3h to jump, and caused pp5v_g3s and p3v3man_pgood to being missing all together. After changing it I get the voltages below now. It is stuck at 20v 0.03A. I have tried a revive and restore in DFU mode but both give an error of code 9.

PPBUS_G3H = 12.63V
PP3v3_G3H = 3.29V
PP1V8_SLPS2R = 1.8V
PP1V8_AWAKE = 1.8V
PP1V1_SLPS2R = 1.1V
PP0V8_SLPS2R = 0.79V
PP3V3_AWAKE = 3.29V
PP1V2_AWAKE = 1.19V
PMU_PVDDMAIN_EN = 3.3V
P3V3MAIN_PGOOD = 3.26V
PP3V_G3H_RTC = 3.0V
PCH_RTC_RESET_L = 3.0V
P5VG3S_EN = 1.8 V
PP5V_G3S = 5.109V
PP2V5_NAND_SSD0 = 2.5V
PP0V9_SSD0 = .9V
PPVCCQ_ANI_SSD0 = 1.8V

Any suggestions? Thanks in advanced.

 

[2informaticos]

Did you follow all the advices from DFU tutorial?
Post a picture of the error message you get.

If you can't complete DFU, there can be a problem with SSD, or T2 itself.
Possibly accumulated crap underneath.

 

[bls951]

I have tried multiple cables, multiple macbooks with different versions of macOS installed.

I'm going to look over the board again to see if there's anything obvious that I'm missing.

Thanks.

 

[2informaticos]

Corrosion always advances in time.
May have problems under T2, or U7800.

Can you access the machine in Target Disk mode?