Macbook Pro A1990-820-01814 Dead

hani

Member
usb c Amp meter shows 20v - 0.05 to 20v-0.26 then 20v-0.01 mA efter 2 sec
PPbus_G3H 12.6 Volt
PP5_G3s 5V
PP3V3_G3h 3.3 Volt
PP3V3_G3H_RTC_X 3.3 Volt
Voltage on L8410/D8410 0 Volt
PP3V3_S5 0 Volt
Voltage On L7030 changed quickly up and down
Resistance to ground on L7030 423 ohm
L7701 137 ohm
L8410 980 ohm
LB700 157 ohm
L7660 403 ohm
L7600 374 ohm
 

2informaticos

Administrator
Staff member
"PP3V3_S5 0 Volt"
Nor even pulsing?

Did you really check ohm scale, or diode mode?
Remember, ALWAYS check in diode mode, red probe connected at ground!
ONLY switch to ohm scale for very low values, below 010 (diode mode reading) for example...
 

hani

Member
i check all the coil resistance again , its the same with the first post.
what is the procedure to generate PP3V3S5
 

hani

Member
update
i remove the heat sink and i found coffee by microscope , cleaned from somebody before
the cofee was on u7410/20 , U7210/20/30 , all the capestors inside R7210/20/30 (20 shorted Cap)
 

2informaticos

Administrator
Staff member
You assume to have short on all caps around CPU, but you didn't post exact (ohm) value.
CPU core and iGPU have very low values as normal.
However, coffee spilled on the CPU power supplies can mean dead CPU now!
 
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