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820-3437

I

iFix

Member
Hi guys.

I have this 820-3437 green light no power.

3v & 5V present created from U7501
PPBUS_G3H - 8.6v
SMC_ONOFF_L Triggers

I found that i'm missing P5VS0_EN which comes from S0 Enables and i don't have voltage even from R1462 and the resistor is fine 100K but it shows when measured on board 36.4k.

PP3V3_S5 i get3.3v on U8180. I tried to solder together pins 4 and 5 on U8180 to get the voltage but still no power.

On U1930 pin 6 i have 3.3v but also normally ALL_SYS_PWRGD is missing.

Any ideas?
 
I

iFix

Member
PM_DSW_PWRGD - 0v
PCH_DSWVRMEN - 2.4v
PM_BATLOW_L - 0v
SMC_ADAPTER_EN - 0v

I remeasured and re-soldering the SMC and i don't have 5 and 3v on coils but i get green and then orange light no power
 
I

iFix

Member
I got back the 3 and 5v there was a broken line near U7501.

Now i have:
PM_DSW_PWRGD - 1.05v
PCH_DSWVRMEN - 2.4v
PM_BATLOW_L - 3.4v
SMC_ADAPTER_EN - 3.4v
 
2informaticos

2informaticos

Administrator
Staff member
Post again all above mentioned signals.
Also check the 4 PCH's RTC signals.

3V3_SUS must appear before pressing power button.
 
I

iFix

Member
PM_DSW_PWRGD - 3.4v at first but after some time drops to 1.05v
PCH_DSWVRMEN - 2.7v
PM_BATLOW_L - 3.3v
SMC_ADAPTER_EN - 3.4v then sometimes drops to 1v

The only place that shows heat on the thermal camera is U7100 but the temperature is below 30
 
I

iFix

Member
PCH_INTRUDER_L - 3v
PCH_INTVRMEN - 3.2v
PCH_SRTCRST_L - 0v
RTC_RESET_L - 3.3v

I bridged PCH_SRTCRST_L and RTC_RESET_L and got 3v and a fan spin and power on. I really don't know why PCH_SRTCRST_L was stuck
 
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