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With battery and charger there is VCORE. There is no VCORE when I connect just charger to board alone on the bench. EDIT: Actually now I don't get VCORE. Battery and charger connected, board in topcase with everything connectes as before..

I already have tested it with another battery, the same.

No, CPU VCORE now is 0V. As I know this board needs to have good battery connected to boot, right?

Board alone takes 20V and is floating around 0.075A. PLT_RST_L is not comming on, it's flat 0V, it doesn't even spike.

Hi, I'm working on 820-01949 board which has slight coffee spill on it. Affected areas are R7439, some corrosion on caps around 7210 and U7100. R7100/7101 have been eaten away along with their pads. I have cleaned up all corrosion, replaced components, resoldered U7100 and recovered traces...

Sadly it doesn't work, fans are spinning but nothing other happens - no chime or image, only two leds on board turns on.

There is a big difference in iMac behaviour with this BIOS. It chimes, lets enter to boot menu, but doesn't see internal SSD. It detects external drives and OS installers, but doesn't boot to them, keeps restarting while loading, but after restart there is no message about problem. Can I ask you...

Hi, could you please share and tested, working BIOS (clean ME) for the board 820-00292? I have a problem with this iMac, it constantly turns on, starts loading system and then restarts with message "computer restarted because of an problem)". I'm not able to enter boot menu or diagnostics or...

Interesting, I have replaced all components related to that line (right speaker which includes hall sensor, audio board with new flex cable, J6100 which was corroded) and nothing has changed. I'll test your solution tomorrow and let know about results.

I've been thinking about that, but haven't tried yet. Do you think there is another way to return SMC_LID_RIGHT to 1,8V? There is no short on this line nor resistors have bad readings...

I got an water damaged MacBook Air A2179 with 820-01958 board. The liquid affected areas were (pictures in attachments): USB-C controllers and D3302/3322 Q8401/ R8400 along with with backlight caps U6500 area Trackpad electronics Audio board connector eaten away as always J6100 had some...

With all devices but LCD disconnected It's still not able to boot into OS on external drive, nor to Windows intstaller. The same in another shell. Bad PCH?

Correct, I can't load macOS from USB drive. Also windows installer gets stuck while loading, It can't get to istallation screen, just hangs on windows logo.

It doesn't load system at all, even in safe mode. EDIT. I have tried several new BIOS files and on some of them computer doesn't even start, on one which seems to be legit clean ME BIOS computer behaves a bit different - when SSD is plugged in I have nothing on the screen, just backlight and...

Hi! I'm working on 820-00138 which is not booting to OS. Actually for most of the time it's stuck on Apple logo, there is even no progress bar. Sometimes after many SMC resets it will load OS to user screen or opens boot drive selection, but for most of the time there is only Apple logo. Board...

Second one fixed too - though J8300 looked perfect I decided to replace it and that was the trick, backlight is back again.

Both boards have 51,2V on PPVOUT_S0_LCDBKLT, so that's not the case ;) I feel, that there is something small I'm missing again..

Ok, I have repaired one of the boards (the one which has been worked on). It turns out I made a mistake measuring J8300 and missed pin 8 LCD_BKLT_PWM_R. There was R7780 missing on the board. Now this one works. The second one is still on process...

Resistors and traces around U8302 are OK. These are voltages on U8302 (LCD connected): pin 1 - 3,3V pin 2 / 5 - 3,3V pin 3 - 3,3V pin 4 - 3,3V pin 6 - 3,3V

Without LCD: I2C_BKLT_SCL - 0,488v I2C_BKLT_SDA - 0,488v With LCD: I2C_BKLT_SCL - 0,463v I2C_BKLT_SDA - 0,462v Are you sure you meant Q8032? I can't find it on BV (820-00163/820-00426) nor schematic for 820-00138. Maybe Q8302? Yes, I'm still getting image on the screen.