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That is how I am currently testing the board. I do not have anything but the charger ports connected. There is no change in PPVCC_S0_CPU. It comes on at 1v and stays there the whole time and the CPU gets hot. I know the voltage should drop to like 0.6v or something like that, so what would cause...

I replaced the BIOS chip with a new one from the same model donor and tried it as-is and the board is back to where I was before now with 20v 1.4a on all ports and not posting. I tried flashing this chip with a known good BIOS from the same model with a clean me and still the same thing. I...

I tried to flash a new BIOS to this but it was failing to erase the chip for some reason. I tried to plug in the charger and now its only taking 20v 40ma, but jumps to 150ma for a second, then back to 40ma. PP3V3_S5 and PP5V_S5 are working and I have S5_PWRGD, but PM_SLP_S5_L is pulsing. All my...

I replaced U3100 but no change so I replaced the SMC and now I am getting 20v 1.4a on all 4 ports and the fans spin at normal speed now. However, the board is still not posting. I don't get any USB activity or image on screen, but have voltage on CPU vcore. PM_PCH_SYS_PWROK - 3.3v PM_PCH_PWROK...

Hello. I got this 820-00928 board in that was liquid damaged and has been worked on previously. UB300 and UB400 were replaced and there was still dried flux around them and UB300 was replaced with a CD3215B chip instead of a C00 version. I was getting 5v cycling on 2 ports, nothing on the port...

I have started working on this one again. I took another look over the board an found that PP0V9_TBT_T_SVR was short to ground. I removed UB000 again and the short was gone, so the original UB000 was in fact bad and shorting that rail to ground. I have replaced it with another one from a...

Airport is normal on this board but Heatpipe Outgoing Air sensor should not be 128 Celsius. That is most likely the reason for the high fan spin

Yea your right. Works fine with another LCD. Thanks for the help.

I did that and compared the ohms values and they are very similar between both boards. I was checking over the board again and actually found that RA900 was missing from the board and pin 1 of CA905 was burnt. I replaced both of them and also replaced UA900 just in case, and now the GPU voltages...

Yea I am missing both internal and external video. I have another one of these boards that I repaired and is now fully functional and I am using that one to compare values to. Looks like PPVCCGT_S0_CPU is 0v on the good board also, but I do get voltage on the GPU coils when I first connect the...

Hello. I have a 820-00928 board that seems to turn on, but no image or backlight on internal display, and no image on external either. I do not know the history on this macbook, but the logic board is completely spotless. Caps lock lights up and the touchbar turns on shortly after connecting a...

So as a last resort on this one I put some flux around the PCH and heated it for only about a minute, and now its not booting fully anymore. I get 20v 250ma and seem to have all voltages except for CPU and GPU voltages. ALL_SYS_PWRGD is 3.3v and PPVCCSA_S0_CPU is 1.1v but PPVCC_S0_CPU is 0v. I...

I have not gotten to the bottom of this yet. I have GPU voltage but no image on mine. I know it’s not U9800 since I replaced it with a know good U9800 and still no image. I think it’s a PCH issue on mine

Use the thunderbolt cable with the lightning bolt on it and hold the keys down for 10 seconds and that should get you into DFU. You may have to try a few times, but it does work for me. I have a A1989 with similar symptoms, and was able to get it into DFU using this process, but the restore...

Well I re-balled the original UB000 and put it back on but nothing seems to change. All 4 USB ports have the same behavior. I figured out the issue with the battery was the black insulation around the battery screw was missing and I was screwing the battery screw right on top of that. I guess...

Yea both boards are identical except that this one has Samsung ram and my other board has Elpida ram, but they are both 4GB chips. Was going to try removing each chip one by one and then seeing if the diode mode value goes up. If I do find that only one of the chips are bad, can I replace that...

PPVCC_S0_CPU - 0.003 (5.5 ohm) PPVCORE_S0_GPU - 0.001 (2.3 ohm)

I had already tried that before posting but it did not help. I was checking some measurements on the board in diode mode and found that PP1V5R1V35_S0_GPU_MEM measures .031 in diode mode on this board and .165 on a good board. I still have 1.4 volts on that line, but the low diode mode reading...

I changed UB000 but still was getting the same error in apple configurator. I can get the board in DFU mode without issues, but the restore fails. Now I just tried it again and it failed with a different error that I have not seen before and now the board will only go to 20v 0.06a on charger...

Yes I do get 0V9/1V8_SSD0 when the board uses 700ma. I took the board out of the case and checked for any signs of liquid damage but the whole board looks perfect, except for the area around UB000. None of the liquid damage indicators were tripped on this one, so the spill seems to have been...