820-01814 not getting to S5 state

[Dusten04]

Good morning,

I have a 820-01814 that is not getting into the S5 state


Device history:
Liquid damage near USB C connector area. Hole burned into the board under connector. Shorting PP20V_USBC_XB_VBUS. No matter how much I dug, i was not able to relieve this short. So, instead of continuing to dig into this board, I decided to bypass this line. What I did was remove the corresponding CD, mask the 4 pads under the CD for this line, then ran jumper from PP20V_USBC_XB_VBUS under the CD.

This got me to 20v.

Current state:
Currently the device is drawing 20v at about 100mA.

Power Rails:
PP5V_G3S: 5v
PP3V3_G3S: 3.3v
PP1V8_G3S: 1.8
PP2V5_NAND_SSD0: 2.5v
PMU_ONOFF_L: 3.3v
PP3V3_S5: 0v
PP1V8_S5: 0v
PP5v_S5_LDO: 5v

So, it looks like U7800, is this correct? Also, are there other prerequisites for the s5 rails to come alive?

Thanks for the advice

 

[2informaticos]

Possibly data lines damaged on the burnt area.

Check first if machine is at least detected in DFU mode...

 

[Dusten04]

It is not detected in DFU.

 

[piernov]

2W of power when off sounds high. Maybe still a short to ground on some power rail.
T2 is at least partially working if USB-PD at 20V is negotiated, should be enough to get DFU.

 

[2informaticos]

If cannot get into DFU, should be a problem with T2 chip then.
Not worth to waste time.
You cannot get into S5, if T2 doesn't properly work.
Try to follow the exact steps in the DFU tutorials linked on the forum.

 

[Dusten04]

Okay, thank you guys