820-3662 not turning on

iClub

Member
Good morning, this mac had 1V on the PPBUS, I checked the u7100 terminals 27/28 had high resistance, then I changed the resistors and the u7100, the PPbus is now 12.56V, but the mac won't turn on.


Voltage:
PPBUS 12,56V
PP3V42_G3h 3,39V
PLT_RST_L 0,021V
PM_SYSRST_L 0V;
PM_PCH_PWROK 0V, pulse 100mV
PM_PCH_SYS_PWROK 0V, no pulse.
 

2informaticos

Administrator
Staff member
Do you get 3V3_S5?
Be aware, this board only turns on with 85W charger, if no battery connected.
Check PM_BATLOW_L level.
 

iClub

Member
PP3V3_SUS gets 3,34V only when SMC_ONOFF_L is triggered.

Sometimes it turns on when it is tested on battery.
 

iClub

Member
[QUOTE = "2informaticos, post: 77014, membro: 682"]
"PP3V3_S5 3,34V"
[/CITAR]
DESCULPE.
L7195 5,5v
L7520 0v, SEM PULSO QUANDO ACIONA SMC_ON0FF
L7560 3,34v
L7310, L7320, L7320, L7870, L7630 0V, SEM PULSO QUANDO ACIONA SMC_ON0FF
L7130 12,47v
 

iClub

Member
PM_RSMRST_L 0V, no pulse when SMC_ONOFF is triggered.

PM_PWRBTN_L starts high at 3.39V, when triggering the SMC_ONOFF drops 0.127V.
 

iClub

Member
I replaced the SMC, in tests it showed the image, but when I turned the mac off and on again, it didn't turn on again. I would try a Bios, when I applied voltage to the PP3v3_SUS, it was shorted.
P1V05S0_LL shows 0.002 Ohm. The PCH gets hot when I apply voltage to PP3v3_SUS
 
Top