820-01958-a 20v no display

MarcinRdm

Member
Hi. MacBook looks perfect, no water, no drop, nothing bad on motherboard. I've tried DFU, no luck (Dfu starts up but doesn't help). Processor heats up.

L9060 - 2.5v
L7670 - 5.1v
L7690 - 3.3v
L7030 - 12.6v
L7400 - 1.8v
L7230 - 0v, 0.3 ohm
L7220 - 0v, 0.3 ohm
L7210 - 0v, 0.3 ohm
L8100 - 1.1v
L8410 - 0v 270 kohm
 
Last edited:

2informaticos

Administrator
Staff member
Compare resistance to ground on CPU coils with good board.

Check L7701 voltage and all outputs from page 66 too.
 

MarcinRdm

Member
Unfortunately, I don't have the same motherboard.

L7701 - 1.8v
P3V3_G3H 3.3v
P3V3G3S_EN 1.7v
PP3V3_G3S 3.3V
PP1V8_G3S - 1.8v
P1V05_VCCST_EN - 3.3 v
PP1V05_PCH_CPU - 0.98v
PP1V05_S0_VCCSTG - 1v
VCCST_EN_C 3.3v
PP1V05_PCH_CPU - 1v
VCCST_OVERRIDE_3V3 - 3.3
PP1V1_S0SW_CPU_VCCPLL_OC 1v
PP1V8_S0SW_CPU 1.8v
PP1V8_S3_FET_R - 1.8v
P1V1_S3_EN 3.3v
PP3V3_G3SSW_SNS 0v
P3V3SEN_SS 0v
SENSOR_PWR_EN - 0v
 
Last edited:

MarcinRdm

Member
Tried revive 2x. Seems to complete, there is no error message, a reboot and a lock symbol on the bad device's DFU icon. CPU still no volt.
P1V8SSD_SW0 1.8V
P0V9SSD_SW0 0.9v
PPVCC_NAND_SSD0 2.5v
PPVCCQ_ANI_SSD0 1.8v
 
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