Macbook 820-000239 no power

Dany1

New member
Hello friends I have this computer that when connecting the usb c the fans rotate at full speed, but it does not turn on, check these voltages:
PPBUS_G3H 13.01

PPBUS_HS_CPU13.01

PPBUS_HS_OTH5V 13.01

PPBUS_HS_OTH3V3 13.01

PPBUS_S4_HS_TPAD 13.01

PPDCIN_G3H 20.23

PP3V3_G3H 3.4

PP3V3_G3H_SMC_ISNS 3.4

PP3V0_G3H

PP1V0_SUS 1.0

PP1V0_SUSSW

PP1V0_S3

PP1V0_S0SW 0.996

PPVCC_S0_CPU 1.0

PPVCCSA_S0_CPU 1.0

PPVCCGT_S0_CPU 0 / 3.1 ohms

PPVCCIO_S0_CPU 0.954

PPVCCPRIMCORE_SUS_PCH 1v

PP1V2_S3 1.2v

PP1V2_S3_CPUDDR 1.2

PP1V8_S4 1.8

PP1V8_S3 1.8

PP1V8_S3_MEM 1.8

PP1V8_S0 1.8

PP5V_S5 5.1

PP5V_S4 5.1

PP5V_S0_T139 5.1

PP5V_S4SW 0

PP5V_S4SW_ISNS 0

PP5V_S0 5.1

PP5V_S0_KBD 5.1

PP3V3_S5 3.3

PP3V3_SUS 3.3

PP3V3_S4 3.3

PP3V3_2V7_NAND_VCC 0..

PPVCCGT_S0_CPU line has 0v verify in diode mode and resistance with reference to ground
Diode: 0.007
Cpu is dead?
Resistance: 3.0 ohm
 

2informaticos

Administrator
Staff member
"PP5V_S4SW 0"
Did you check for short?

No idea about other voltages where you posted names, without values!

Post U8213 voltages.
 

Dany1

New member
U8213 is not factory installed

Check voltage on the pads:
Pp5v_s4 5.1v
Smc_sensor_pwr_en: 3.3v
P5v_s4sw_sns_fet_ramp: It ranges from 1v to 600mv
Pp5v_s4sw: now It ranges from 1v to 600mv
 

Dany1

New member
Now the list is complete:
PPBUS_G3H 13.01

PPBUS_HS_CPU13.01

PPBUS_HS_OTH5V 13.01

PPBUS_HS_OTH3V3 13.01

PPBUS_S4_HS_TPAD 13.01

PPDCIN_G3H 20.23

PP3V3_G3H 3.4

PP3V3_G3H_SMC_ISNS 3.4

PP3V0_G3H 3.0

PP1V0_SUS 1.0

PP1V0_SUSSW 0.994

PP1V0_S3 0.998

PP1V0_S0SW 0.996

PPVCC_S0_CPU 1.0

PPVCCSA_S0_CPU 1.0

PPVCCGT_S0_CPU 0 / 3.1 ohms

PPVCCIO_S0_CPU 0.954

PPVCCEDRAM_S0_CPU 0

PPVCCPRIMCORE_SUS_PCH 1v

PP1V2_S3 1.2v

PP1V2_S3_CPUDDR 1.2

PP1V2_S0SW 1.2

PP1V8_SUS 1.792

PP1V8_S4 1.8

PP1V8_S3 1.8

PP1V8_S3_MEM 1.8

PP1V8_S0 1.8

PP5V_S5 5.1

PP5V_S4 5.1

PP5V_S0_T139 5.1

PP5V_S4SW 0

PP5V_S4SW_ISNS 0

PP5V_S0 5.1

PP5V_S0_KBD 5.1

PP3V3_S5 3.3

PP3V3_SUS 3.3

PP3V3_S4 3.3

PP3V3_2V7_NAND_VCC 0
 

2informaticos

Administrator
Staff member
"U8213 is not factory installed"
Then PP5V_S4SW is not required.

Really no need to measure PPBUS in 5 points!

VCCGT only appears under high graphics load; no short there.

"PP3V3_2V7_NAND_VCC 0"
This is a problem.
Check diode mode to ground first.
If no short, post U9400 voltages; pins 19, 20, 15.
 
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