A1990 - 820-01041-A - U3000 blown - short on PIN2 USB_SOC_TYPEC_N

[samstown]

Hello

For data recovery only, does 820-01041-A need U3000 to start ?
U3000 blown, I removed it, pads 6 & 7 gone. I see a short on PIN2 USB_SOC_TYPEC_N. It goes to UE010 on schematic but the board is a little bit different. If I remove UE010 would Mac start ?

Thanks

 

[2informaticos]

Board should start without U3000 (USB redriver); hoping the voltage spike didn't pass over UE010 to T2.

 

[samstown]

So I can try to remove UE010 ?

 

[2informaticos]

Try without U3000 first...

 

[samstown]

I did, I get 20V,, 0.7 Amp but it doesn' start

 

[2informaticos]

Test again removing UE010.

 

[samstown]

Sorry for my ignorance but boardview show a chip but there's nothig on the motherboard

 

[2informaticos]

Then RE006/7 are used instead.
Remove them and check for short to ground at USB_SOC_P/N.

 

[samstown]

U3000 looks ok, no short on USB_SOC_P/N but Mac doesn't start. It goes up to 0.5 amp and drop to 0.1

there's 4 USB-C.
Top left port USB-C - nothing, USB-C multimeter stay black
Mid left port USB-C - 20V - up to 0.5 amp and drop to 0.1
Top right port USB-C - 20V - up to 0.5 amp and drop to 0.1
Mid left port USB-C - 5V stay at 5V 0.17 amp

Looking at SSD
SNS_P3V3_G3W_SSD0_N Diode mode .431 Voltage 3.36V
SNS_P3V3_G3W_SSD0_P Diode mode .431 Voltage 3.36V
SNS_PPBUS_MAIN_SSD0_P Diode mode .412 Voltage 12.24V
SNS_PPBUS_MAIN_SSD0_P Diode mode .412 Voltage 12.24V

 

[2informaticos]

"Top left port USB-C - nothing, USB-C multimeter stay black!
Very likely dead CD3215 chip.
Compare its diode mode readings with other channels; pay atention to CC1/2 lines.

 

[samstown]

DB529 is blown. USBC_TA_USB_TOP_ N was shorted. I remove it, now diode mode is .556 (What component are DB ?) Still not booting.

UB300 - USBC_TA_CC2 diode mode = .550
UB300 - USBC_TA_CC2 diode mode = .550

UB400 - USBC_TB_CC1 diode mode = .548
UB400 - USBC_TB_CC2 diode mode = .552

U3100 - USBC_XA_CC1 diode mode = .584
U3100 - USBC_XA_CC1 diode mode = .588

U3200 - USBC_XB_CC1 diode mode = .53
U3200 - USBC_XB_CC2 diode mode = .124

Should I remove U3200 ? Macbook won't boot if one CD3215 is faulty ?

 

[2informaticos]

"U3200 - USBC_XB_CC2 diode mode = .124"
Usually points to bad CD3215 chip.

However, check first diode mode at USBC_XB_CC2_CONN; may have luck and just bad DZ3351.

 

[samstown]

DZ3351 - diode mode .539 - USBC_XB_CC2_CONN
Need to replace U3200 ? removing is not enough ?

 

[2informaticos]

MLB doesn't boot with missing CD3215 chip...

 

[samstown]

ok, I will replace it, hope it will work

 

[samstown]

CanI use CD3217 ? I don't have any CD3215

 

[2informaticos]

Did you even look at both chips layout???

 

[samstown]

Ok, I have my answer