820-01041 - 20v 0.02a

[Palhano]

With the battery connected, I have 20V, it starts pulling 0.6A, 0.7A, and then drops to 0, looping. Without the battery, it stays stuck at 20V and 0.02A (stable).

- I use an original 87W charger.
- All CD3215s have perfect LDO lines
- Same behavior on all ports
- I tried to restore in DFU, but it gives an error.
- C7020 - 4.7 ohms / C7023 - 4 ohms
- Without the F7000/1, the C7050 has 12.3V
- I didn't find any shorts.

Any help?

 

[Palhano]

I forgot the measurements of the u7000. I forgot the measurements of the u7000. With the F7000/1 in place
P_IN - 20v


AUX_DET - 4.1v
SMC_RST_IN - 0
VDDA - 5v
VDDP - 5v
EN_MVR - 5v
SMC_RST* - 1.8v
AUX_OK - NC
AMON - 0
BMON 0

 

[2informaticos]

Any history available?
Do you get all G3S and SSD voltages?

Check diode mode on all secondary power rails.

BTW, SMC_RST* is not used.

 

[Palhano]

My Mac stopped working overnight.

I took it apart and it was very dirty. I thought it was a typical short on the SSD's 2.5V line, but there were no shorts.

I have G3S voltages, and on the SSD, I only have 12.6V PPBus. I don't have 2.5V.

Regarding SMC_RST*, my notes showed NC for the 9240 chip, but the schematic for this board shows a test point, and I have 1.8V. I found that very strange!

 

[2informaticos]

SSD may have internal NAND failure.
These chips have life time limited by years (5-10), or writen bytes.
Sometime die without any reason...

 

[Palhano]

Do you think it's worth trying to change the SSD controller or is it a waste of time?

 

[Palhano]

I discovered that I do not have the PP3v3_s5, even with the battery connected, which stays at 20v and pulling 0.7a and restarting. There is no short in the line, diode mode 0.330

 

[2informaticos]

Intel side power sequence starts after SSD gets voltages.
T2 needs to run its boot software from SSD.