820-3332 Green light no start

rlowe215

Member
Im working on a 820-3332 and cant really understand whats going on.

With keyboard attached its starts up, but no green light and fans going full speed. Cant find ssd but boots into efi and pass.

Without keyboard I get green light but no fan spin


Measurements without keyboard

PPBUS_G3H 12.3v


PP5V_S5 5v

PP5V_S4 0v


PP3V3_S5 3.3v

PP3V3_S4 0.140v

P3v3s3_s4 3.3v
 

2informaticos

Administrator
Staff member
"PPBUS_G3H 12.3v"
Incorrect communication between SMC and ISL6259.

Test the board alone, no battery, no keyboard, nor other accessories.
It should start automatically with original 85W charger.
If not, post PPBUS_G3H, SMC_ADAPTER_EN, PM_BATLOW_L, S5_PWRGD, PM_DSW_PWRGD, PCH_DSWVRMEN, PM_SLP_SUS_L, 3V3_SUS.
 

rlowe215

Member
Measurements earlier was with board alone,
PPBUS_G3H 12.3v
SMC_ADAPTER_EN 3.3v
PM_BATLOW_L 0v
S5_PWRGD 3.3v
PM_DSW_PWRGD 3.3v
PCH_DSWVRMEN 3.22v
PM_SLP_SUS_L 3.3v
3V3_SUS 0v
 

JohnB8812

New member
I suspect crap under the SMC if PPBUS is 12.3. Is SMC_RESET_L 3.3 volts? If so, reflow SMC. If no change either bad ISL or SMC likely
 

2informaticos

Administrator
Staff member
"PM_SLP_SUS_L 3.3v
3V3_SUS 0v"
3V3_SUS shorted to ground?
If not, post volatges for Q7802/20.
Be sure to use 85W charger!
 

rlowe215

Member
3V3_SUS 0.382v in diode mode

Q7802
Pin 1 0v
2 0v
3 3.3v
4 0v
5 0v
6 3.3v

Q7820
not sure about pin positions, boardview dont show correct
1 0v
2 0v
3 3.3v
4 3.3v
5
6
7

Using PSU to power board
 

2informaticos

Administrator
Staff member
Does it always start with keyboard AND trackpad connected?
PM_BATLOW_L level in such case?
Can you run ASD EFI test?
 

rlowe215

Member
Thats what makes me confused YES it starts all the time with keyboard but dont get green light when it starts. as soon as i disconect keyboard I get green light but no start. no charging when starts. as mentioned in start of post I can get into efi and it pass =( that why I dont understand anything about this board.

Something must have happened with the keyboard, when I plug in a brand new keyboard it dont start but get green light. So it just start with the keyboard it came in with
 

2informaticos

Administrator
Staff member
Remove any keyboard.
Use R5015/16 to simulate power button.
Tell us if starts then.

You didn't reply about PM_BATLOW_L level with that "bad" keyboard connected...
 

rlowe215

Member
do you mean short r5016 to ground?

With bad keyboard PM_BATLOW_L at first 0 after 2 sec 3.3v and starts

changed smc and ppbus now 12.6v all other the same
 

2informaticos

Administrator
Staff member
"do you mean short r5016 to ground?"
Or R5015, which one you want.
In fact, solder a tiny wire to SMC_ONOFF_L and momentary touch the ground with it.
Did you start it on charger only, or battery connected too?
Do the tests without battery.
Try to start in SMC bypass, if doesn't start in normal way.
 
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