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PP5V_S4SW_ISNS is 0v but there isnt anything there.. PP3V3_S4SW_SNS is slightly low at - 2.925v PPBUS_G3H - 12.6v PPBUS_HS_CPU - 12.6v PPVIN_G3H_P5VG3S - 12.6v PPVIN_G3H_P3V3G3H - 12.6v PPVIN_G3H_P3V3G3HRTC - 12.6v PPDCIN_G3H - 20v PP5V_G3S - 5.135v PP5V_S4SW - 5.135v PP5V_S4SW_ISNS - 0v...

R7677/78/79 are all good. Applied power - 5v .25a then 19v .08a up to .21a then back to .08a. This time it doesn't short and when plugged back in it does the same thing. 5.135v on 5V_G3S

replaced: R7609/65 C7609 U7600 U7650 Short was on U8400 again. When testing the board I use naked board out of case with only one charging port attached. Should I go ahead and apply power again or test something else prior? Any chance charging chips are somehow frying this line? R7678...

fried PP5V_G3S again.. same as before. What could keep shorting things out on this line?

u8400 got hot. Replaced and board is no longer pulling amps from psu. pin 1 of L7600 is only up to 0.084v to ground. Edit - now its at .340v... going to test the board.

pin 1

R/C7609 are good, same with traces. Short on PP5V_G3S is 0.6 ohms..

Replaced disp connector - no change. Any ideas why the OS isnt recognizing the display??

Plugged in and fried PP5V_G3S again... 5v, 40amps then 19v 0amps. unplugged and plugged again - 5v 0amps. PP5V_G3S - .02v to ground. (not u8110 this time). pp5v_usbc - no short. Stopping on this until I get a reply... Please help

If I remove u8110 the short goes to .7v. Poking around I found a short on pp5v_usbc. If I also remove rb706, rb701, r3506, and r3501 - then my short on pp5v_g3s goes away. Pulled a replacement for u8110 from an 820-3787. Is this ok? Short is gone - .295v to ground on pp5v_g3s. replaced u3500...

Liquid damage. Lots of minor blue everywhere. components around u3100 has minor corrosion. u7650 looks like it might have been hit the hardest. When plugged in I get 5.12v-5.16v on each port. No amps. Looking around u7650 I noticed PPVIN_G3H_P5VG3S had .02v to ground. Traced it back to u7600...

When connected to external, in system info under graphics/display the display is not recognized. In safe mode it is. it seems the OS isn’t communicating with the display. Similar to how keys can work in boot menu but not in the OS? if this doesn’t reveal anything I’ll try Windows.

Already put back. Will try another BIOS file. I don’t have a bootable for those.. it does boot into installers and in safe mode so I would assume so. In safe mode the GPU is shown in system report fwiw.

External video is good. yes same result with different displays. pram - no change. I understand the values are different but on other boards I’m getting 98k-100k on these. Seems to have something to do with how the OS manages the display? I even tried going back to Sierra as I know the...

Checked pull up/down resistors around u9800. GFX_SELF_THROTTLE - 80k instead of 100k DP_T_SNK1_HPD_EG - 82k instead of 100k Removed u9800 and they stayed the same. Tested off the board and they were good. Replaced u9800 with donor and new u9850. Same result.

welp.. thought it was good but its not. Boots to boot menu and install media. Will even install OS without any issues. but when finished and loading OS it gets to about 75% and the display cuts out. Otherwise, the mac is still on. "Built in screen reader" prompt is heard. Boot from eternal is...

Replaced j8500 and u9850 (again) and all is good.

the standard - pin 1/43 burn on j8500. Display side looks good. Replaced u9850 and tested - nothing. 1/43 burned again and pin 3 short to ground. Removed u9850 and short gone. Cleaned up j8500 and check for continuity between ground and 1/3 then replaced u9850 and verified short was gone...

Coming back to this board.. EDP_PANEL_PWR_EN - 0.733 DP_INT_HPD - 0.639

It was C6422 audio_amp_r. What causes that to short?