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All the parts for SMC_CPUHI_COMP_ALERT_L are no stuff on these boards so 0v seems normal. I checked another board and it also has 0v there. I cannot get this board to start at all. I tried another charger and did SMC bypass and now I do get high fan spin, so its definitely in SMC bypass, but...

SMC_CPU_HI_ISENSE - 44mv SMC_CPU_IMON_ISENSE - 18mv SMC_DDR1V2_ISENSE - 22mv SMC_CPUDDR_ISENSE - 28mv SMC_CPUHI_COMP_ALERT_L - 0 SMC_CPU_ISENSE - 6mv SMC_SSDLIM_ISENSE - 21mv SMC_CPUGT_IMON_ISENSE - 4mv SMC_CPUSA_VSENSE - 0.9v SMC_CPUSA_ISENSE - 17ma SMC_CPUGT_ISENSE - 20ma

Sorry wrong signal. SMC_PBUS_VSENSE is 2.1v both when I try and start normally or in SMC bypass. Normal boot (Charger only): SMC_PBUS_VSENSE - 2.1v SMC_DCIN_VSENSE - 0v SMC_DCIN_ISENSE - 176mv SMC_BMON_ISENSE - 5.9mv SMC Bypass: SMC_PBUS_VSENSE - 2.1v SMC_DCIN_VSENSE - 2.65v SMC_DCIN_ISENSE -...

I am using an original apple 96W charger actually. PPBUS_S0_VSENSE - 12.56v SMC_DCIN_VSENSE - 0v SMC_DCIN_ISENSE - 176mv SMC_BMON_ISENSE - 5.9mv

Yes it is correct at 3v

Got a strange one here. Board is in excellent shape, with no signs of corrosion or damage anywhere. When you try and turn it on, you hear it chime very faintly, and then it just keeps chiming over and over again and never turns on. Nothing on the screen and cap lock does not react. CPU VCORE is...

A1707 and A1708 should be the same. https://logi.wiki/index.php/A1706/A1708_TConn_Backlight_Pinout_(FlexGate)

Yea I figured that was not a good idea, which is why I asked first. I replaced UA600 one last time with a new one and then I put the board through the ultrasonic cleaner again because it was covered in flux and then let it dry over night. To my surprise, now it is turning on a gives me an image...

I got around to finally replacing the PCH on this board and now I have got CPU Vcore back but its stuck at 1.1v and no GPU Vcore voltages. Is it safe to remove UA600 from the board and try and turn it on without this chip just for test, or would that cause some kind of damage?

You can try and reflow U4200. I have fixed a few on these just by doing that.

That is an issue with the backlight cable on the screen. Should be an issue with one or more of the LED return lines for the backlight. Check the repair you did on that cable. This may be useful for you. https://logi.wiki/index.php/A1706/A1708_TConn_Backlight_Pinout_(FlexGate)

Yea I know but I have already checked for knocked off components and broken traces and I did not find anything. I have a Crest ultrasonic cleaner that I use all the time without any issues, so I don't think the UC would have broken any traces.

This board had some minor corrosion on the back side of the board near the LCD connector, but the LCD connector itself is clean. Original issue was a short on PPBUS, which I cleared by replacing C7395. Then when I tried to turn it on, it was taking 20v 1.8amp without the battery and was not...

I had a similar issue on the same model board and it was a blown L4085 that caused it. Check that and the other components in that area to make sure they are good.

I checked the resistances on Q7680 and they all match vs a good board. I was not aware that the LDO block of U7800 was powered by PP3V3_G3H_RTC. So based on the voltages below, it looks like U7800 is the issue? PP3V3_G3H_PMU_VDDMAIN - .924v PP1V1_SLPS2R - 0v PP3V3_G3H_RTC - 3.3v PP1V8_SLPS2R -...

I have 0.9v on 3V3_G3H so it does seem to be enabled somehow. The 3V3 enable signal for U7650 is just a test point that does not go to any other chip. U7800 is powered by PP3V3_G3H_PMU_VDDMAIN, which is also 0.9v because its comes from PP3V3_G3H. So I do not have any voltages that come from...

23: 12.3v 12: 0v 13: 0v 22: 3.3v 29: 0v 21: 0v

Hello. I got this 820-01987 board in that was pretty badly liquid damaged. Most of the damage was around the backlight circuit and CD3217's. The board was originally stuck on 5v and PPBUS_G3H was only 0.7v and 0.068 in diode mode. I removed C6456 and the diode mode value on PPBUS went up to...

I do not know what those caps are for, but I do know that they are supposed to be like that. I have tested them on a board that works 100% and its still shows both sides of those caps as ground, so that should not be causing your issue.

If the LCD connector on the screen was liquid damaged, then U9850 is most likely dead. Replace U9850 and see if that fixes it.