820-00165 2 quarter fan spin

Bouba148

New member
WD, passed in the UC

2 Quarter Fan Spin
No green Light
PPBUS_G3H: 8.19V U7100 not talking to SMC
PP3V42: 3.415V
PPVRTC_GH: 3.328V
PP5V_S5: 4.987V
PP5V_S4RS3: 0V
CPUVCore, Pins 7 & 3 of U1950 twice too

Able to read SPI Rom, and doesn't look corrupted.
Checked all SPI Bus Series Termination resistors and traces: OK

R17/18: 3.4 Ohms
R27/28: 20.5 Ohms
SMC_TDI and SMC_TCK shorted to GND under SMC

reflowed SMC: fan was spinning at full speed then stopped after 2-3 minutes but still SMC_TDI and SMC_TCK shorted to GND.
Waited turned off and on then came back to 2 quarter fan spin.
When I put my probe on PM_DSW_PWRGD at R1451 the fan does a quarter spin, this rail is directely connected to the SMC

Before removing SMC for reballing any suggestion?
 

Bouba148

New member
Reballed SMC :
Short to GND for SMC_TDI and SMC_TCK GONE both: 3.414V
Goes in S3 State
Fan Spin at ful speed around few minutes then stops
NO Green Led
PPBUS_G3H: 8.19V
SMC_ADAPTER_EN: 0V
SMC_S4_WAKESRC_EN: 0V

All symptoms looks like SMC Dead or pb in reballing ( I'm not an expert in reballing: took few hours to reball this one and some ball smaller that the others )
 

Bouba148

New member
I reballed the SMC again.
Now I'm almost sure my reballing job is ok.
Unfortunately The board reacts the exact same way: DEAD SMC
00165 are compatible with 00164 right?
 

Bouba148

New member
OK thanks
Just to let you know that I reballed it again ( 100% sure ) exact same issue.
Will try to get a 00165 SMC
 
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