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So last week I got in an A1708 with 820-00840 board just for a straight battery swap, took the old battery out as usual no issues, connected new battery up powered on and I get the flashing folder with ? symbol. Replugged the SSD - same behaviour - unplugged battery and tried without battery -...

Well we can put this one as solved - U9080 had a tiny bit of corrosion underneath which after removing, cleaning and fitting a new IC has resolved the issue. Thank you for the pointers in the right direction! Luckily the SSD has survived this stupid design by apple to put this controller so...

Diode Mode to ground on PPBUS_G3H - 0.398 L9080 - 0.371 L9580 - not present on this board None of the other coils read anywhere near the same reading and I did already check if any of them were shorted to PPBUS_G3H previously (Forgot to mention) After removing F7000 and F7001 and i'm getting...

Got an A1990 820-01814 which is stuck at 5V with no current draw. Occasionally it does switch to 20v and also with no current draw and no power but i havent seen it do that very often! It was slightly liquid damaged around JB200 and C9080 - i've cleaned up both areas and no issues there, have...

So a little bit of backstory on this one I received an A2338 820-02020 in for repair again. This is a device we previously repaired around 9 months ago for no power - in that instance we replaced one of the CD3217's (UF400) as it was burned out which fixed the problem. Same device has come...

The configuration you did is correct if you replaced all RAM chips with the ELPIDA ones of 16GB and 1866 speed. If however I am reading this correctly - you left the Hynix ones on the board and just added 8GB of ELPIDA chips? You cannot mix and match like this you need to have the chips all...

U7000 replaced and same behaviour - it has made no difference.

I'll order a new U7000 and try that first

So i've got an 820-01958 liquid damaged and it's stuck at 5V 0A - it's been ultrasonic cleaned and looks good now. Only real area of corrosion was around U6960 where we had R6960 loose and has been replaced. All other resistors are connected and measuring normally. PPBUS_G3H is 12.3V Device is...

So I had a bit of free time to look through some of my boards with weird issues and I had this 820-01958 which had sound only from headphones - no sound from speakers at all. Troubleshooting got me to SPKRAMP_RESET_L having an odd diode mode reading (0.002) and 20ohms to ground. Obviously went...

No liquid on either touch ID or audio board both clean. All testing I did so far was with those two disconnected anyway - only had the charger alone or the charger and battery connected. Looking at the power on sequence it gets up to PP3v_G3H which is present and stable at 3V. PP5V_G3S is...

So I have an 820-01958 in for fixing now - was liquid damaged but customer neglected to tell us this before we opened the device and found it. So we had liquid damage and a burned port going to the type c ports - we also had liquid damage around the top CD3215 controller. I've replaced the...

Further visual inspection reveals what looks like a broken component - maybe a diode? Attached a picture, the left side is connected to ground and the right side is not!

I'll check out 02100 schematic see if I can guess anything based on that. I've tried DFU revive and it doesn't even get detected so that's a no go. Do we know which voltage rail is required to be working on these M1's to get the charger switching to 20v?

Got an 820-02098 in which had liquid damage. I've gone through the board under the microscope cleaning all areas I could find any issue with and i've run the board through the ultrasonic. I ran through the power on sequence on the repair wiki and found that PPBUS_AON was shorted - i've...

After waiting a couple weeks for U7800 from china received today fitted and machine working normally again. Wish there was a better source for these chips than having to wait weeks from china though!

No output from any of the LDO's out of U7800. Also no lines shorted.

So I got an 820-1521 in today - completely dead no sign of liquid anywhere. No damage visible - the machine is stuck at 5V on both ports. PPBUS is 12.31 PP3V3_G3H_RTC is present. PP5V_G3S and its associated enable is missing. Awake and Sleep voltages are also all missing. Not detected at all...

Well after much messing around I managed to get my hackintosh up to 10.15.7 and ran the apple configurator software. It detected the mac in recovery mode and successfully restored it. All working fine now - is this a common issue after SSD power issues?

yes that idea did cross my mind but i only have a 2014 13" Macbook Pro. I do not have any newer machines I can use and the hackintosh system I have which does have a thunderbolt 3/type c port on it will not update to 10.15.6 so I can use the apple configurator software! Is there any way of...