820-3462 SMC_ONOFF_L low voltage

[macfix]

Hello Everybody

I'm working on A1425, first problem was PP3V42_G3H create problem. it solved after R6905 ,R6920 changed but now SMC_ONOFF_L voltage is too low (1.5V) . PP3V42_G3H line to SMC_ONOFF_L resistance is 30ohm but it must 8.5-9K around ( i checked with known good board)

Also changed R5070 and removed U5010 nothing changed, only when removed SMC resistance is ok ..

Replaced 5th SMC but same resistance and 1.5V is same soo no green light or no power.

Where can i check next step ...

 

[dukefawks]

What is resistance to GND now, are you measuring this without power and keyboard connected?

 

[macfix]

30ohm is resistance at ground. (disconnected power and keyboard )

 

[dukefawks]

C5710 or corrosion in KB connector?
Also U5010 must be present, board will not work without.

 

[macfix]

Thanks Duke suggestion

Removed C5710 and R5710 but same resistance Double time checked keyboard connector but looking good...

 

[dukefawks]

What SMC are you using to replace it?

 

[macfix]

Duke replaced from same code donor boards SMC.

 

[dukefawks]

30 ohm makes no sense. I see in your other thread you are measuring ohms with battery plugged in, you can't do that!
It makes no sense that multiple SMC give the same problem. It can only be shit around U5110 as there is nothing else connected besides SMC, U5110 and C5710, R5710.