820-2330 PP5V_S3 missing

[ajdoc]

Tested with genuine 85W charger.
Cant find any liquid on board but trackpad is damaged by liquid which is powered by PP5V_S3_TPAD and I think thats why 5V rail is missing.

Got light on charger and was checking list of power rails and PP5V_S3 is missing.
There is no short to ground when there is no power on the board, but when charger is connected got short to ground on PP5V_S3.

Don?t know much about 5V / 3.3V Power Supply but thats what I got.

U7201/16 @12.62V
U7201/3 @2.001V

L7260 @3.33V on both sides
L7220 @0.0V on both sides

Q7210/3 @3.40V
Q7210/5 @0.0V

PM_SLP_S4_L @0.0V

Thanks in advance

 

[JohnB8812]

Are you shorting the power pads to try and turn it on? If so, what is your resistance to ground on PP3v42_G3H?

 

[2informaticos]

"when charger is connected got short to ground on PP5V_S3"
You are not the first, but I recommend you STOP to check continuity on a powered board!!!

Trigger SMC_ONOFF_L signal and see if PM_SLP_S4_L pulses at least.
Did you try to start in SMC bypass mode?

 

[ajdoc]

JohnB8812
When shorting power pads nothing happen.
Resistance to ground on PP3v42_G3H is 3.030 kOhm


2informaticos
"You are not the first, but I recommend you STOP to check continuity on a powered board!!!"
Thanks, will not doing that anymore

"Trigger SMC_ONOFF_L signal and see if PM_SLP_S4_L pulses at least."
No pulse.

SMC bypass - still dead

 

[2informaticos]

"Resistance to ground on PP3v42_G3H is 3.030 kOhm"
Too low, MCP is dead almost sure.
You must get more than 30K there...

 

[JohnB8812]

Yeah 3Kohms is too low dead MCP waste of time

 

[ajdoc]

Thanks guys