820-4924-A Doesnt turn ON

MaxFix

Member
Hi there,

Was water damage but not too bad. After ultrasonic clean:

PPBUS_G3HOT -12.5V
PP3V42_G3H - 3.5V
PP5V_S3 - 0V
PP5V_S0 - 0.3V
S5_PWRGD -3.4V
SMC_ADAPTER_EN - 0V
PM_SLP_S4_L - 0V
PP5V_S5 - 0V
PP3V3_S4 - 0V
PP3V3_SUS - 0V

Corrosion was on:
U5110
C5120
C5127
R5127

Please advice how to proceed. Thanks!
 

MaxFix

Member
No light on Magsafe. No ADAPTER_EN, no SMC_RESET.
U5110 pin 1 - 3.42V.
Using good old apple magsafe 1 85W with dual output: 18.5V 4.6A and 16.5V 3.6A but also tried with 60W Magsafe just in case ;)
 

smiba

New member
SMC_ONOFF_L high? SMC_MANUAL_RST_L high? R5100 within specification?

If yes to all, I'd say replace U5110
 

dukefawks

Administrator
If SMC_RESET is not high then PPBUS can never be 12.5V, it will be 12.3V. Also you have no green light so why did you even measure anything after that?
U5110 issue, R5100 corroded or crap under SMC.
 

MaxFix

Member
Correct. PPBUS is 12.3V.
Replaced U5110. One leg was corroded.
Got orange light on MAgsafe but still no SMC_RESET or Adapter_EN.
Put contact cleaner under SMC. Then ultrasonic it. Then pressure air. Dry. Test. No Luck. Reflow with flux. No luck. No more orange on Magsafe.
SMC_ONOFF_L high
SMC_MANUAL_RST_L low
R5100 replaced because was off but now in right value.
SMC?
 
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