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820-01521 5V 0A

A

ajdoc

Member
Board with heavy liquid damage for data recovery.
Every couple of seconds there is tiny amp spike on charger.

U3100/200 LDOs have correct voltages.

PPBUS 12.26V
PP3V3_G3H 3.30V

U7000:
P_IN 5.14V
AUX_DET 1.28V
SMC_RST_IN 0.0V (0.586 in diode mode)
VDDA 5.12V
VDDP 5.12V
AMON 0V
BMON 0V

PPOV8_SLPS2R 0V (0.110 in diode mode)
PP1V1_SLPS2R 0V (0.120 in diode mode)
PP1V25_SLPS2R_SMC_AVREF 0.17V (0.644 in diode mode)
PP1V8_SLPS2R 0V (0.12 in diode mode)

PP1V8_AWAKE 0V (0.320 in diode mode)
PP1V2_AWAKE 0V (0.173 in diode mode)
PPVDDCPU_AWAKE 0V (0.10 in diode mode)

Any idea?
 
A

ajdoc

Member
Changed U7800 twice, and same issue.
All voltage did not change.

My another idea was to re-flash U2890.
When shield was removed there saw bad corrosion on U2890.
Re-flashed it and same issue.
Replaced and re-flashed another U2890 and still the same issue.

There is tiny hot spot on U7800 every a few seconds, and it was before I replaces U7800 as well.
Checked in diode mode all line which go to U7800 and found short to ground (0.001 in diode mode) on P0V8SLPDDR_SW1.
Injected low voltage and only T2 get warm.

It is game over?
 
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