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820-00850 - does not charge battery

Palhano

Palhano

Member
The device turns on normally with the battery charged, but the Mac does not recognize the charger in any port.
With the battery, I have 20v 0a. Without the battery, the Mac does not turn on, I have 5.13v 0.23a.

I have 12v on the PPBus. In the CD3215 tests I noticed that at times I have, in diode mode, 0.140 on the PP3v3_G3h lines. But with the charger, I have 3.3v.

The measurements of the u7000
P_IN - 5v
AUX_DET - 1v
SMC_RST_IN - 0
VDDA - 5v
VDDP - 5v
EN_MVR - 5v
SMC_RST* - NC
AUX_OK - NC
AMON - 0
BMON - 0
 
2informaticos

2informaticos

Administrator
Staff member
Any history available?

"in diode mode, 0.140 on the PP3v3_G3h"
Do you mean 3V3_G3H_RTC?

Inject 3.3V there and check with thermal camera if any CD3215 heats a bit more than other.
 
Palhano

Palhano

Member
No history. The board is very well preserved, without oxidation or liquid marks.

Sorry! Yes, it was the 3V3_G3H_RTC line. After a while without use, the board showed 0.380 when measured in diode mode, but when I put the charger in and took it out, it went to 0.120, 0.140!

I injected 3.3v, the power supply pulled 0.050a and nothing got hot.
 
2informaticos

2informaticos

Administrator
Staff member
Then is no problem there.
Always allow 10-15s before checking in diode mode, once power is removed.

Do you get all expected LDOs for all CD3215 chips?
 
Last edited:
Palhano

Palhano

Member
I've never done this procedure. I need to look for the socket for this chip. Does the ROM have any specific files for this model?
 
Palhano

Palhano

Member
It didn't work. It still doesn't charge the battery. I checked all the resistors near the CD3215, and I didn't find anything wrong.

Any other tips?
 
Palhano

Palhano

Member
The situation has worsened.

I no longer have 20V with the battery and the Mac no longer turns on with the battery.

With and without the battery, I have 5V and 0.23A on all ports

The LDOs are perfect. PPBus 12.2V. I tested the ports with the S-UEM2 and it did not show any problems.
 
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