820-01700-05 Top ports 5V, Bottom Ports 0V. Replaced blown CD3217. Now 5V on each port. Still no power

[CGid]

I have an 820-01700-05 that came in for now power. Upon checking the ports, the top 2 ports would get 5V ~200-300mA current draw. Bottom ports would give 0V.

After opening it up, we found the bottom ports' corresponding CD3217 ICs were blown. (PP3V3_G3H_RTC_X shorted on both with visible hole in the ICs)
I replaced both chips from a donor. Same location, same IC, same board number.

Now I get 5V on each port with around a ~250mA current draw.

PPBUS - 12.29V
PP3V3_G3H - 3.3V
PP1V8_SLPS2R - 1.8V

I attempted forcing the system to DFU via an external button. The device goes into DFU mode (1.8V measured on SOC_DFU_STATUS to confirm) , but is not detected by Apple Configurator.

Any thoughts on what to do next?

 

[2informaticos]

Try reflashing U2890 and UB090.

 

[CGid]

Reflashed both ICs. I now get 20V on all ports but hover around a 62mA power draw. Only chip getting warm under thermal is T2.

I can still go into DFU mode and get 1.8V on STATUS to verify. However, I still can't see the system connected via Configurator.

 

[2informaticos]

Are you using 96/140W charger?

 

[CGid]

Using a known good 96W charger

 

[2informaticos]

Try different connection cable for DFU.
Better to use one previously tested with other machine; for DFU communication.

 

[CGid]

The DFU cable I'm using I've used for at least four other Macs prior to this one. And it's still in quite good condition. I'll try it out though

 

[CGid]

Still no change with confirmed good charger AND confirmed good dfu cable.