820-02016-A 5v - 0.07- 0.18 amp

[ronaldo]

Hi, I have this A2337 with liquid damage to the audio board and to the keyboard connector (PPBUS_AON_IPD_FLT - 3 pins completely gone on the FPC connector).
I removed UC850 and replaced but still had abnormal reading on this line, so the IC wasn't the issue.
PP1V8_AWAKE had a short due to damage on audio board, we removed U8100 but the short was still there so issue wasn't the PMIC. We removed it initially because there was a small glow on the thermal camera. Other than that injecting voltage does not give any glow under the camera.

PPVBUS_USBC0 - 5.18v
PP3V3_S2_UPC - cycling very rapidly between 0v and 0.12v, diode mode reading is OK
PP1V5_UPC0_LD0_CORE- 1.58v
PP3v3_UPC0_LDO- 3.4v
PP1V25_S2- 0V
UPC0_SS- 0V
PPVBUS_USBC1- 5.2v
PPBUS_AON - Very rapid cycling, 0 to ~9v to 12.8v
PP3v8_AON_VDDMAIN- cycling, 2.7 to 3.7v

 

[2informaticos]

I suspect damaged M1 CPU, as it has lines connected to audio connector.

 

[ronaldo]

Thanks for your reply. After removing PMIC again and checking yes CPU is shorted, I forgot to mention that PP1V8_S2 was short to ground, I suspect due to corrosion on the JF202.... Removed the WiFi IC and the short is gone... So board is a write off Thanks for your time