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SMC reset does not seem to fix it, but randomly it will boot to the SSD if I keep turning it on and off.

I double checked and yes it is 3.27v when the board boots to the internal SSD and then 0v when it boots to flashing folder icon. SSD_RESET_LB_L is 3.27v steady also and it has the _L on the end. I ran diagnostics and it only reports error PPF004, there may be an issue with the fan, but the fans...

Yea 13v went to the CPU from the shorted U7410, so the CPU is dead.

I have this board that was severely liquid damaged around U7800 and the trackpad connector was burnt. I replaced U7800 and the components around it and also had to dig out a short on PPBUS in the board by the trackpad connector. I cleared the short and replaced the trackpad connector and ran...

I have started working on these again and tried replacing U3900 from a donor board, but I still have the same issue. I do not have any A1708 or A1706 boards that work right now, but I do have a working A1989. I checked the values on that board and CPU vcore does drop to 0.6v and...

I do not have a good board right now, but I am pretty sure it is supposed to drop to 0.6v when it boots. I tried with another external SSD connected and the light turns on but does not flash, so I guess I just have power no activity. Doesn't the CPU need PPVCCEDRAM_S0_CPU before it will fully boot?

I actually have 2 of these 820-00923 boards that have the same issue. Both had the same initial damage, liquid damage on J4402 and pins 22 and 20 melted and damaged the board in that area and the touchbar cable. The rest of board looks completely clean. I checked and there is no short on either...

Liquid damage on LCD connector damaged the CPU, so its most likely not fixable without replacing the CPU. You can check diode mode on EDP_INT_AUX_N to see if it is shorted. Most likely is, because that is the pin that is right next to the LCD backlight

I changed U7000, but still the same issue

Diode mode values seem to match another board. With both battery and charger connected, SMBUS_3V3_BATT_SCL is 3.3v, but pulses down to 3.2v. SMBUS_3V3_BATT_SDA is 3.3v, but pulses down to about 2.7v. With just the battery connected, they both seem to be steady 3.3v. I can try and replace U7000...

I tried with a known good battery and PPBUS pulses from 11.6v to 12.3v, with the charger connected. Without the charger and just the battery connected, PPBUS seems to be steady 11.2v.

3V3_G3H stays steady at 3.3v the whole time and the meter shows 20v still but the amps do drop down at little when PPBUS drops.

Update on this one. I still have this board so decided to take another look at this. Found that MESA_INT_CONN was shorted to ground, only when the power button was connected, so the short was coming from the touchID button itself. The pad on the power button flex cable for that signal was burnt...

I checked diode mode to ground on all the SSD rails and they all match against my working board, so not convinced its a SSD issue. My previous post was incorrect when I said I have steady voltages up until S5. I now noticed that all my AWAKE and SLPS2R voltages still pulse, but they stay steady...

With just charger it is 12.32v

I have a 820-01041 board that has minor liquid damage on the U3200/U3100 side of the board. I was getting only 5v on the charger and 450ma, which is high. I replaced U3200 and U3100, but still had 5v 450ma. I checked the board on thermal, and saw U9580 was getting hot. Replaced U9580 and got...

Yea I can get it into DFU. I tried a T2 restore twice, once with the battery and once without. When I tried it without a battery connected, it takes like 10-15 minutes and then it just gives me that 4005 error and it does not turn on. When I try with the battery connected, it actually appears to...

The A1708 does not have a touchbar, but the A1706 does so I assume you mean that. Yes the touchbars should be compatible between the 2 models. Your issue is the connection to PP5V_G3S on J5100. Run a wire and it should fix it.

Yes battery data cable is connected. Board takes 20v 0.09a with just the charger, no battery. With charger and battery, 20v 0.01. I also notice with just the charger, PPBUS is 12.3v and then with both charger and the battery connected, PPBUS is only 11.3v.

Yea you were right. The trace for PMU_ONOFF_L had no connection to pin 4 on U4901. I ran a wire to fix this and power button does work now. When I reassembled the board in the case, I connected a charged battery to it this time and now it takes 20v 0.01amps with both the battery and charger...