820-3115-B No Green light.

[Dewanbd]

This unit was liquid damaged, green light turn off after 10 seconds.
SMC_ADAPTER_EN=3.4v

Pp3v42_g3h= 3.4v
SMC_BC_ACOK= 3.3v

ADAPTER_SENSE =2.9v
sys_onewire= 2.9v
Ppbus_g3h =12.5 volt
CHRG_acin=3.9v
Any help please??

 

[2informaticos]

Post U6900/01 voltages.
Did you try another DCIN board?
Does the board start?

 

[Dewanbd]

U6900/01=3.47v
tried another known good DCIN board.
the board never start.

 

[2informaticos]

"U6900/01=3.47v"
What should I understand?
Each one has 5 pins...

 

[Dewanbd]

U6900: P1 SMC_BC_ACOK_VCC=3.47V
P4, SYS_ONEWIRE=2.9V
P5, ADAPTER_SENSE=2.9V

U6901: P1,2 , SMC_BC_ACOK=2.8v
p5, PP3V42_G3H=3.47v
p4, SMC_BC_ACOK_VCC=3.47v

 

[2informaticos]

SYS_ONEWIRE is a bit low; looks like SMC issue.
Where was the liquid spill?
Put good flux and reflow SMC...

 

[Dewanbd]

Liquid was around smc and bios. i reflow it, 200C tem and good flux, bought it from you guys.still it shows SYS_ONEWIRE=2.9V and no luck.

 

[2informaticos]

Reball SMC.
Next, check all SPI Bus Serie Termination resistors and trace/solders for U6100.

 

[Dewanbd]

Reball SMC and check all SPI termination resisters and tested ok. Unit works great. Thanks.