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Hello, just coming back to this. Unfortunately I do not have a good board to compare it with, but here are my readings. L9080 - 0.011 L9580 - OL (No SSD here) CPUGT_SW L7410 - 0.003 L7420 - 0.003 CPUCORE L7211 - 0.001 L7221 - 0.001 L7231 - 0.001 L7330 - 0.011 GFXIMVP_PHASES LA340 -...

Hello guys, I have a 820-01814 (using 820-01041 schematic) and found that PPBUS_G3H is power cycling. It measures 10.9 volts most of the time, but in short 3-4 second bursts it holds at 12v and in some cases 13v - battery connected. It stays 12.3 volts or sometimes 13 volts when battery...

Hello, I have a MacBook Air that does not want to turn on. Plugging in a known good charger shows a blank amp meter screen when typically we see 5v or 20v. I replaced the type C charging ports and replaced the CD3217's to quickly rule them out. I have a schematic, but I don't have a board view...

Hello, With and without the battery connected, I get the 20v on charger and a charging battery symbol on the screen, but does nothing else. Plugged in charger, I get 20v 0.75-1.2 amps for 25-30 seconds This is with the board alone on the desk After 25-30 seconds, it will go to 20v 0 amps...

Thank you for your help!

USB mouse works fine when I boot to linux with user interface. I replaced U7100 to rule it out since R7101 was blown right beside it. I tried booting macOS with verbose text. These images are on two separate startup attempts. Output is a little different on each attempt, but maybe there is a...

I disconnected the LCD and tested with external monitor with known good working type C to HDMI adaptor and it did not output anything. I also tested with LCD connected - same result.

Hello guys! I have a MacBook that had water damage. It had missing 20v which I fixed by replacing the type C chips and charging port. It had PPBUS_G3H, but no CPU core. Fixed it by replacing bad R7101 / C7101 and ran a wire to U7100 CPUVR_VIN. Now it boots, however it would never get past the...

Hello, I have a MacBook Air here that powers on just fine. I am able to hold D or start Internet recovery, but as soon as I connect to Wi-Fi, after 5-10 seconds of it starting, the computer restarts. The main operating system also loads to the Apple logo, stays there for 20-30 seconds and then...

Yes, correct. PPVCC_S0_CPU_PH1 = 1.8 volts PPVCC_S0_CPU_PH2 = 1.8 volts PPVCC_S0_CPU_PH3 = 1.8 volts PPVCORE_S0_GFX_PH1 = 0.85 volts PPVCORE_S0_GFX_PH2 = 0.85 volts VR_PHASE_GPU_VDDCI = 0.9 volts These are consistent and never changing. PLT_RESET_L = 3.3 volts Other random readings...

It currently fails both when mounted in shell and when board is alone on desk. No output to external monitor either. I tried new BIOS chip + flash several times already so it must be something else.

I was about to reassemble the MacBook after further tests and the MacBook is back to not being able to post. Just a fan spin, responds to power off button, no backlight and that's it. This one is very odd.

I guess I got lucky. This one did the trick with a whole new BIOS chip + clean ME flash.

Removed BIOS and pins 5 and 6 is now 3.3 volts each. Faulty BIOS chip it seems - checked with a programmer and I am unable to get a read from it? Where can I get a clean Rom to flash?

Hello, I have a 820-00163 that powers on with a fan spin, but nothing else. Customer said it just suddenly stopped working. No corrosion found, board looks clean. PPBUS_G3H = 12.6 volts PPVCC_S0_CPU_PH1 = 1.8 volts PPVCC_S0_CPU_PH2 = 1.8 volts PPVCC_S0_CPU_PH3 = 1.8 volts PPVCORE_S0_GFX_PH1 =...

Hello, I have a 820-01700 water damaged motherboard. Corrosion on U7230 and UA750 as well. PPBUS_G3H shorted to ground and found out U7230 sent the voltage to the CPU. I just want to make sure the CPU is indeed fried. I currently have 20 volts 0 amps on the charger (why 0?). I already replaced...

Thank you for the tip! I will get some ordered. As for your tweezers, which model do you recommend? I want to look into this.

EDIT: I fixed it by reflowing all the RAM chips. I figured I probably used too high of a temperature for removing the shorted cap on the other side of the board.

Hello, C7553 was shorted (PPBUS_S5_HS_COMPUTING_ISNS). Replaced and now got fan spin, but getting 3 beeps indicating RAM issue? Battery is connected and it runs off battery just fine. PPBUS_G3H = 8.4 volts PPDDR_S3_REG = 1.359 (low?) PPVCORE_S0_CPU = 1.1 volts PPCPUVCCIO_S0_REG = 1.08 volts...

Hello, I have a MacBook A1706 EMC 3163 which had screen damage where there was a 2 inch vertical section of the screen that was completely black with a little bit of static / grainy screen which I haven't really noticed until a little later. Replacing the screen got rid of it, but what remains...