A bit of history before we start
Liquid damage around the SMC and a few other areas. After repairing all the visible damage and traces it was still not turning on. I decided to replace the SMC and it turned out it had quite a bit of corrosion underneath, however, didn't turn on after the new SMC. I left it for the day after and when i tested again it turned on (booted OS just fine). I cleaned the board in ultrasonic and it stopped working again after that. (missing pm_slp_s5_l)
I took a working board with a faulty CPU and started taking known good parts to replace. All of the following i replaced are known good working parts.
SMC - Didn't work
U7100 - Didn't work
U5110 - Didn't work
U1900 - Worked
So, I said to myself, perfect, it was the clock. I cleaned the board and boom doesn't work again.
All the measurements are taken after this point.
PPBUS_G3H - 12.47V
PPVRTC_G3H - 3.31V
EDITED: PM_SLP_S5_L - 1.49V
PM_SLP_SUS_L - 0V
S5_PWR_EN - 3.3V
CHGR_A/BMON - 0.03V/0.07V
SMC_BC_ACOK - 3.1V
PP5V_S5 - 4.98V
PP3V3_S5 - 3.31V
PP3V42_G3H - 3.41V
PP3V3_S5_SMC_VDDA - 3.41V
PP3V3_S5_AVREF_SMC - 3.27V
SMC_PBUS_VSENSE - 0V
There was no damage around u7100 nor around u1900. The damage was heavy in and around the SMC (all fixed) and U8330 (fixed as well)
TLDR:
The board didn't work after fixing all the visible damage but turned on fine after 12 hours of sitting.
It stopped working again after cleaning and started working after replacing the clock chip.
It stopped working again after cleaning and I have no clue why. I cleaned 3 other boards today without any issues.
It might be worth mentioning that both pins 67 and 68 under the SMC were completely gone due to corrosion but both are saying not connected.
Using OEM 85W charger for all tests.
Liquid damage around the SMC and a few other areas. After repairing all the visible damage and traces it was still not turning on. I decided to replace the SMC and it turned out it had quite a bit of corrosion underneath, however, didn't turn on after the new SMC. I left it for the day after and when i tested again it turned on (booted OS just fine). I cleaned the board in ultrasonic and it stopped working again after that. (missing pm_slp_s5_l)
I took a working board with a faulty CPU and started taking known good parts to replace. All of the following i replaced are known good working parts.
SMC - Didn't work
U7100 - Didn't work
U5110 - Didn't work
U1900 - Worked
So, I said to myself, perfect, it was the clock. I cleaned the board and boom doesn't work again.
All the measurements are taken after this point.
PPBUS_G3H - 12.47V
PPVRTC_G3H - 3.31V
EDITED: PM_SLP_S5_L - 1.49V
PM_SLP_SUS_L - 0V
S5_PWR_EN - 3.3V
CHGR_A/BMON - 0.03V/0.07V
SMC_BC_ACOK - 3.1V
PP5V_S5 - 4.98V
PP3V3_S5 - 3.31V
PP3V42_G3H - 3.41V
PP3V3_S5_SMC_VDDA - 3.41V
PP3V3_S5_AVREF_SMC - 3.27V
SMC_PBUS_VSENSE - 0V
There was no damage around u7100 nor around u1900. The damage was heavy in and around the SMC (all fixed) and U8330 (fixed as well)
TLDR:
The board didn't work after fixing all the visible damage but turned on fine after 12 hours of sitting.
It stopped working again after cleaning and started working after replacing the clock chip.
It stopped working again after cleaning and I have no clue why. I cleaned 3 other boards today without any issues.
It might be worth mentioning that both pins 67 and 68 under the SMC were completely gone due to corrosion but both are saying not connected.
Using OEM 85W charger for all tests.
Last edited: