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Thank you for the help, D7710 showed low on pin 2 in diode mode, read about 0.150V. Definitely was shorted and found C7710 was shorting the rail. Thank you!

No backlight board, board came to me with liquid damage, however very minimal, and the spill seemed to have not contact anything critical. Backlight circuit has no damage, neither does display connector. 0V on backlight output, started to diagnose with good working screen. I would get image...

I wonder if display is damaged internally then too? Very strange. This has basically been a very weird rabbit hole. I replaced U7700 and still same issues. Any other advice? Backlight flex (Do you mean keyboard backlight cable) was not being bent however, in anyway. This is an A1502, I know...

R7750 - 0.5 Ohm R7751 - 0.5 Ohm R7752 - 1.5 K Ohm R7753 - 1.6 K Ohm These seem normal? When I booted to OS X, Ive noticed very weird symptoms. It also told me how old and used the machine is, battery has 1200+ cycles lol. OS X Registers brightness keys, and keyboard backlight brightness...

Diode mode to ground on SCL/SDA lines, red probe to ground. R7750 - 0.530 (Measured again, goes to 0.526) R7751 - 0.526 R7752 - 0.526 R7753 - 0.526 D7710 is not shorted, diode mode to ground reads 1.155 (pin 2), and 0.848 (pin 1). D7710 has continuity to J8300. Feedback trace and R7731 and...

Hello, 820-4924 with some water damage on the LVDS connector, replaced and still no backlight, pin 1 was frayed and bent, so I replaced it. That is the only known history on this board. Backlight circuit looks untouched. Tested with a 100% known working display, and the display had the bad LVDS...

UPDATE: Let this be a bookmark for anybody that has an issue like this. This was not a dead CPU/PCH at ALL! Check Wifi card and USB pins before final diagnosis! Board fully works now once J3501 was removed. EDIT: Could someone also give me an explanation on this as well? Thank you!

820-3437, liquid damaged Symptoms are very strange. Board will start up, and take around 400-600 mah, then restart (normal), then take another 400-600 mah, and then go to around 700-800 and stay there. We do have VCORE, and all other rails are present. No chime, No video (Externally or EDP)...

820-00928 Will run off charger alone, no battery connected, will run off battery, however when plugged into charger while on battery, it will say "Battery Is Not Charging". I used my USB-C meter, and the board will take 20.38V and 0.000-0.020 mah while plugged into the charger, and having the...

Thought I could maybe fix keyboard if anyone knew something I didn't ?‍♂️ Thank you

I dont have another keyboard yet, however I have a fully working motherboard of a 820-3476 and it produces the same issue. It could be the connector too not 100% sure however keyboard itself looks really good, no obvious signs of water damage yet original board did have some.

Update: Got my hands on a file, however this was misdiagnosed. I flashed a new bios and discovered the keyboard is not working properly. 5, T, H, and Space do not work. As well as E, D, C, and left command, hence why PRAM reset wasn't working. Does anyone know what keys respond to what...

820-3536 board Symptoms are will turn on, in a constant bootloop, chime every 3 seconds. SMC reset does work but nothing changes, PRAM reset does not work. I cannot find any 820-3536 files online, only 3476, are they the same?? Inspected board and some corrosion around U7200, and J6100...

So do these bad chips kill the CPU? how are the 6708/3030 chips different? Thank you btw

820-00426, symptoms are all power rails are present, board alone takes a little over an amp, and slowly rises CPU and GPU VCORE all present, as well as clean ME and reflashed BIOS chip, USB lights up but no activity. Im leaning this towards a dead cpu, however I just want to be sure. R to G on...

Replaced Q5830 and fully working and correct temperatures. Happy Macbook.

You are right, misdiagnosed onoff reaction, as it reacts to it as the power button, hold for more than 5-6 seconds to have effect. thank you once again Also it does not always boot into bypass mode, just sometimes, especially when I leave it in macOS running for some time. Looking into U5800...

SMC_ONOFF is a constant 3.42V, even when pressing power button. No pulse on PM_BATLOW when triggering SMC_ONOFF by power button and tweezers manually. No change in reaction with LIO connected or disconnected. Reflow smc? EDIT: fans run high and macos boots into safe mode sometimes, checked hw...

820-00165, history is weird, however came to me with dent in charger port, and it looks like some charger port water damage too. Owner said she brought it to apple and they diagnosed it as a bad logic board. Board will boot in safe mode on its own sometimes, and fans will spin to max. When I...

Im going to end this post, as now im noticing all_sys_pwrgd is shorted, pin 1 of u1950 is not connected to all_sys_pwrgd, which it should be, its not going to ground either so, too many broken traces, wouldnt sell this to anyone even if fixed, Ive found 10 broken traces already. Thank you...