820-02020 5V only with battery connected

[No-Clean]

Clean board, when first came in one port had 20V and the other had 5V with battery connected, when checking the bad port PPVBUS_USBC0 had 0.5V when I as connected to the other port, after replacing UF400 that went away and now I have 20V on both ports but only with battery connected but 0A and obviously Mac is not charging, Mac boots because the battery still has charge, without battery I only get 5V 0.200A on both ports.

RF4/5xx are all fine.

PP5V_S2, PPHV_INT0_AONSW, PPVBUS_USBC0, PP3V3_S2_UPC, PP1V25_S2, PP3V3_UPC0_LDO, PP1V8_S2, USBC0_3V3LDO_EN, PP1V5_UPC0_LDO_CORE, PPVBUS_USBC0, PPHV_INT0_AONSW, USBC0_CC1 all measure correctly.

Tried reviving Mac in DFU and it did it just fine but same charging problem, I have not tried restoring it in DFU yet.

Not sure what to do, this is a first for me.

 

[2informaticos]

Check UPC_I2C_INT_L and UPC_SMC_I2C_INT_L signals.
Low levels denote problems on USB-C area.
Also check voltage and diode mode on corresponding SCL/SDA lines.

 

[No-Clean]

UPC_SMC_I2C_INT_L and UPC_SMC_I2C_INT_L diode mode good, both after connecting power are 0V while board is at 5V

I2C_SMC_UPC_SCL 0.8V RD210 OK Diode read on par with good board.

I2C_SMC_UPC_SDA 0.9V RD211 OK Diode read on par with good board.

Both UF500 and UF400 were replaced and the result is the same.

 

[2informaticos]

What about UF280 SCL/SDA lines?

 

[No-Clean]

I2C_UPC_SCL and I2C_UPC_SDA 1.8V

 

[2informaticos]

Their diode mode readings also good?

The interruption signals from USB-C area should be high.
Low level denotes problems there.

Save data and try DFU restore.
If still the same, check all resistors/traces around UF400/500.

 

[No-Clean]

I2C_UPC_SCL and I2C_UPC_SDA diode reading are fine.

Are I2C_SMC_UPC_SCL 0.8V and I2C_SMC_UPC_SDA 0.9 voltage should be 1.2V compared to good board are this lines bad?

Just in case USB-C data works fine, just no charge.

Battery currently has some charge and all else works fine.

Erased/restored and same thing.

 

[2informaticos]

UF280 has two pairs of SCL/SDA; checked all?
Replace the chip, just in case.

 

[No-Clean]

At the end I measured a lot of the related 5-20V circuits and all measured fine, the one sign that I could see was PPBUS at 12V even and not 12.6V.

One thing I could see was that I2C_UPC_SCL and I2C_UPC_SDA was 1.2V but no data was going thru when looking with oscilloscope I did the same with a good board and I could see clock and data that is why I decided to replace the CD3217 chips again.