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MacBook Pro A1707 820-01814 No Power

G

GeniusPlace

New member
Hello community!

here I have a problem with a 15 inch MBP A1707, which does not turn on.
I checked the voltage, and it's stuck at 5v 0.02 amps for all charging ports.

So my question is: how can I be sure it's the CD3215 chip? And which of the 4 chips is faulty ?

There is no liquid damage, it just happened overnight.

Awaiting your reply,
best regards and thanks !
 
2informaticos

2informaticos

Administrator
Staff member
We need some more readings, like PPBUS_G3H, 3V3_G3H_RTC, AWAKE and SLPS2R voltages.

Compare diode mode to ground and voltage on LDOs of all CD3215 chips.
 
2informaticos

2informaticos

Administrator
Staff member
Low Drop Output rails of CD3215 chips.
You will undertsand looking isnide of their block schematics.
 
G

GeniusPlace

New member
Hello,
Here are the tension and diode mode requested:

PPBUS_G3H : 12,3V 407 ohm
3V3_G3H_RTC_X : 3,3V 093 ohm
PP1V8_AWAKE : 1.79V 387 ohm
PP3V3_AWAKE : 3.37V 634 ohm
PP1V2_AWAKE : 1.19V 524 ohm
PPVDDCPU_AWAKE : 0.7V 014 ohm
PPVDDCPUSRAM_AWAKE : 0.79V 090 ohm
PP1V8_SLPS2R : 1.79V 380 ohm
PP1V1_SLPS2R : 1.09V 140 ohm


LDO from U3100
PP3V3_UPC_XA_LDO : 3.3V 468 ohm
PP1V8_UPC_XA_LDOA : 1.78V 530 ohm
PP1V8_UPC_XA_LDOD : 1.78V OL
PP1V1_UPC_XA_LDO_BMC : 0V 489 ohm (1.1v if I connect the charger on the right port XA).

LDOs from U3200
PP3V3_UPC_XB_LDO : 3.36V 504 ohm
PP1V8_UPC_XB_LDOA : 1.78V 471 ohm
PP1V8_UPC_XB_LDOD : 1.79V 480 ohm
PP1V1_UPC_XB_LDO_BMC : 0V 504 ohm (1.1v if I connect the charger on the right port XB).

LDOs from UB300
PP3V3_UPC_TA_LDO : 3.36V 470 ohm
PP1V8_UPC_TA_LDOA : 1.8V 528 ohm
PP1V8_UPC_TA_LDOD : 1.79V 482 ohm
PP1V1_UPC_TA_LDO_BMC : 0V 508 ohm (1.1v if I connect the charger on the right port TA).


LDOs from UB400
PP3V3_UPC_TB_LDO : 3.35V 467 ohm
PP1V8_UPC_TB_LDOA : 1.8V 528 ohm
PP1V8_UPC_TB_LDOD : 1.79V 483 ohm
PP1V1_UPC_TB_LDO_BMC : 0V 514 ohm (1.1v if I connect the charger on the right port TB).


What do you think about it ?
 
2informaticos

2informaticos

Administrator
Staff member
Looks more like SMC communication problem.
What shows USB-C meter if connect the battery?
Trigger SMC_ONOFF_L and see if tries to start, with battery connected.
 
G

GeniusPlace

New member
When the battery is connected to the motherboard, the USB-C meter shows me 5.2V , 0.084 A and 0.44W.

I tried to find the SMC_ONOFF_L on the schematic, but I can't find it. Could you please explain to me what it is and what exactly I should do with it ?
 
G

GeniusPlace

New member
So if I understood your query correctly, you want me to inject 20V on the PMU_ONOFF_L line to see if it tries to turn on. For example on R8015. That's right ?
 
G

GeniusPlace

New member
No, I didn't do that.
How can I use this pad if it is under the motherboard when I put it back in the case to connect the battery?
Can I use the R8015 component to do this test?
 
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