Macbook air A1466 no power

madjid

New member
820-00165 green orange light, no fan, no boot
at first it did not turn on with battery, so I changed the smc but since no more starting
no short, no liquid damage

PP5V_S5 5v
pp3v42_G3H 3,42v
ppbus_g3h 8,6v
p3v3_s5 3,3v

PP3V3_S4SW_SNS 0v
SMC_SENSOR_PWR_EN 0v
pm_pwrbtn_l 3,42v

I changed several times smc but same result
 
Last edited:

2informaticos

Administrator
Staff member
Don't change components without reason.
Put logic in the repair process.

Do you get 3V3_SUS?
If yes, trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).
 

2informaticos

Administrator
Staff member
Then you have a PCH related problem.
Check first its basic requirments; PM_DSW_PWRGD, PCH_DSWVRMEN, PM_BATLOW_L, SMC_ADAPTER_EN and the 4 RTC (DC) signals.
 

madjid

New member
PM_DSW_PWRGD 3,42v
PCH_DSWVRMEN 3,16v
PM_BATLOW_L 0v
SMC_ADAPTER_EN 3,42v
RTC_RESET_L 3,31v
PPVRTC_G3H 3,32V
PP3V42_G3H 3,42
PP3V3_S5RS3RS0_SYSCLKGEN 3,32v
PP1V2_CAM_XTALPCIEVDD 0v
PP3V3_TBTLC 0v
SYSCLK_CLK25M_X2_R 0v
SYSCLK_CLK25M_X1 0,32v
PCH_CLK32K_RTCX1 0,48v
 

2informaticos

Administrator
Staff member
"PM_BATLOW_L 0v"
PCH can't start power on sequence then.
Are you using original Magsafe 2 charger?

BTW, apart of RTC_RESET_L, I don't see other RTC DC signal listed.
Are not there 3 other lines EXACTLY near it on the same PCH RTC block?
I didn't ask for power, nor RTC clock.
 

madjid

New member
PCH_CLK32K_RTCX1 0,43
SYSCLK_CLK25M_CAMERA 0v
SYSCLK_CLK25M_TBT 0v
PCH_INTRUDER_L 2,90v
PCH_INTVRMEN 3,20v

yes with original charger, same with other charger same result, can you give me the signals you need? Sorry I'm still harmful compared to you

when I took the voltage on PCH_INTVRMEN, the motherboad turned and the fan turned hard and the processor heated normally, it's like I had woken it up I think maybe I touched RTC_RESET_L at the same time without do it on purpose between r1302 and r1303

I took the charger out and put it back in but it won't start.

sorry for my English I am French
 

madjid

New member
I still managed to make it start by touching PM_RSMRST_L with the multimeter, I already changed three smc for the same result : s
 

madjid

New member
oui PM_BATLOW_L 0v, R1410 dessoudé 10kohms, R1410 soudé 2,5kohms
R1410 pin 1 : 3,3, pin 2 : 0v, the resistor alone is 10k, but 2k when soldered, mode diod pin 2: 2,2 it's a short?
 
Last edited:
Top