(347) 552-2258 help@rossmanngroup.com

[help]Macbook Air 820-3437 Dead

P

phantom

Member
PPBUS at 8.6V
No Fan Spin
I get Magsafe light (green than orange with or without battery)


motherboard water spill (cleaned from another techician)

3V3_S5 present
3V3_Sus not present
P3V3SUS_EN 0v
PM_SLP_SUS_L 0v (no short)


PM_PWRBTN_L 0,3v
SPIROM_USE_MLB 0v
S5_PWRGD 0v

PCH_DSWVRMEN - 3,1 3v
PM_BATLOW_L - 3.4v
SMC_ADAPTER_EN - 0v
RTC_RESET_L 3,3
PCH_SRTCRST_L 3,3
PCH_INTRUDER_L 2,5 and PCH_INTVRMEN 3v
 
Last edited:
P

phantom

Member
r8141 (same value) and u7501 changed ,,,,still 0v

STILL 0V EVEN WITH 10K RESISTOR
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
You've said to have 3V3_S5 when I asked you.
If the voltage is not correct, power good is kept down by U7501.
Check the feedback network, R7560/1/3.
 
P

phantom

Member
i'm going crazy..i think i will commit suicide....pleas 2informaticos...forgive me for all this chaos....


i have soldered a BRAND NEW U7501...now i miss some voltages...help :(


3V3_S5 not present
3V3_Sus not present
P3V3SUS_EN 0v
PM_SLP_SUS_L 0v (no short)


PM_PWRBTN_L 0 v
SPIROM_USE_MLB 0v
S5_PWRGD 0v

PCH_DSWVRMEN - 3,28
PM_BATLOW_L - 0v
SMC_ADAPTER_EN - 0v
RTC_RESET_L 3,4
PCH_SRTCRST_L 3,3
PCH_INTRUDER_L 2,5 and PCH_INTVRMEN 3,2v
 
2informaticos

2informaticos

Administrator
Staff member
Post U7501 basic voltages; 23, 22, 12, 13, 29, 21.

"r7560/1 1,4v
r7563 2,8v"
I meant to check their OHM values...
 
2informaticos

2informaticos

Administrator
Staff member
You can play with their values, to adjust 3V3_S5.
Now the problem is missing it completely...
 
Last edited:
You must log in or register to reply here.
Top