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This board had some pretty bad liquid damage and partial short on PP3V8_AON. Almost every component on the board had some level of corrosion on it. The worst areas were around the ISL9240, the 3v8_AON MOSFETs and the speaker amps. I had to replace the ISL and almost all the caps and resistors...

I checked diode mode values on all of the pads for U9300 with a donor board and it seems I have a broken trace on pin 19 of U9300, S3X_PFN. That pad is .456 on a donor board, but OL on this board, so it not connected to U8600. That was the only issue I found. Would that signal cause U9300 to not...

I am sure I soldered it properly. PP3V3_2V7_NAND_VCC - .336 PP0V9_SSD_FIXED - .296 PP0V9_SSD_REG - .245 PP1V2_SSD_HOT - .307 PP1V2_SSD_COLD - .279 PP1V8_SSD_COLD - .294 PP1V8_SSD_HOT - .370

Now I started to get intermittent voltages on the SSD power rails. I removed U9300 and found some dirt/corrosion under it. I replaced it twice with chips from donor boards, and both times I get 0v on all the SSD rails now. It appears U9300 is being enabled, but not sure what could be the issue...

Those values were with the SSD not working. I went to check them without the battery and all of a sudden the board was stuck at 5v again. Found UB300 died, so I had to replace that to get 20v back. After replacing UB300, the board turns on again, but now I get flashing folder all the time, with...

ISNS_PICCOLO_IOUT - 0.002v SMC_PICCOLO_ISENSE - 1.2mv ISNS_SSDNAND_IOUT - 0.005v SMC_SSDNAND_ISENSE - 2mv

If I try and start from USB MacOS with battery, it gives me the critical software update error, since the SSD is not detected. If I boot in safe mode, it will boot to the OS and the internal SSD is not shown in disk utility at all.

Without Battery: PPBUS is 13.04v and the computer turns on and boots to the OS every time. I tested it, and it appears to be fully functional without the battery. When I run diagnostic, the only error is that the battery was not detected. With Battery: PPBUS is 11.19v and I get a flashing...

I got a 820-00923 that originally did not turn on at all. PP3V3_G3H was shorted to ground and I found corrosion on CB300. I removed CB300 and the short was gone. Replaced CB300 and now diode mode was around .360 on pp3v3_g3h and it turned on. I originally tested it without the battery and it...

According to this it should be compatible. https://logi.wiki/index.php/MacBook_LCD_Screen_Compatibility#MacBook_Pro_USB_C

I got another TLV70733PDQN and replaced UT390. Now I got 3.3v on PP3V3_S2_IPD, but the keyboard and trackpad still did not work. The trackpad does not even click, so it seemed like its not getting power at all. I checked all the traces and they seemed fine, so I suspected the trackpad was bad...

U2800 could also cause the this board to be stuck at 5v. I had one with the same issue as you, and did not get 20v until I replaced U2800_X and U2800_T.

Yea its still 0v without the trackpad connected. I do not have anymore TLV70733PDQN chips to replace UT390 with. Can I use another chip, like the NCP160AMX180 from older boards?

I have a 2021 16" 820-02100 board that is liquid damaged. It only had some light corrosion around UD102 area and pin 32 on the keyboard connector, which was for PP3V3_AON_KBD_CONN. I cleaned the corrosion and replaced some resistors and caps. The mac turns on and makes the chime nosie and I can...

I tried another trackpad from an A1708 because I was not sure if the trackpad I was testing with was actually good or not. With the A1708 trackpad, it works in the boot menu, but then does not work in the OS or recovery mode.

No the trackpad does not work even in boot menu. I did what you said, but still same thing. No keyboard or trackpad

I got a 820-01598 that was liquid damaged around the trackpad connector and did not turn on. Trackpad connector was burned on PPVIN_S4_TPAD_FUSE. I cleaned the area and replaced the trackpad connector with a new one. All diode mode readings on the trackpad connector seemed to match a good board...

Change U9850

Please let us know if you have any success fixing this issue by replacing the GPU. I have a board with similar kernel panic error.

This is solved now. See below for what I did to fix it. Hopefully it helps someone else. I tried multiple different CD3217's from multiple different donor boards, and none of them seemed to work. I was always getting 5v 0.27a on all 4 ports using just the charger, but it turns on using...