820-3662 no green light

[daniel_andrei1996]

Board is clean, no signs of liquid damage, PP3V42 is present
PPBUS_G3H was at 4V, no green light on charger
R7121, R7122 both blown
I've replaced both resistors and U7100
Now PPBUS_G3H is 12.6V as normal but I still don't have a light on the charger and board won't start. Board seems to start in SMC bypass mode
SYS_ONEWIRE is 0.7v. I've tried replacing U7000 but no change.
Also tried reballing SMC, still no change.

Anything else I should try before I replace the SMC?
Thanks

 

[2informaticos]

Post all U7000 voltages.
Did you try known good DCIN board?

 

[daniel_andrei1996]

Hi, sorry just got back around to this board now. I've got the following at U7000

1	SMC_BC_ACOK_VCC	3.416v
2	GND	0v
3	NC	0v
4	SYS_ONEWIRE	0.773V
5	ADAPTER_SENSE	0.716V
	r7029 1.98KOHM

I don't have another DC-board on hand for this model but I think the one I have is good. All the inductors/resistors seem to measure ok/low resistance and the little chip marked P7 doesn't seem blown (I've seen them burn up before)

 

[2informaticos]

If you are sure about DCIN board, change SMC.

I first recommend to try removing TVS diode from DCIN board.
You cannot correctly diagnose a diode with the eye!

 

[daniel_andrei1996]

you're right, I got a new DC-board from Amazon and boom, green light.

Sorry for wasting time, and thanks for the help