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I hope so. If you have one that is 100% sure working and it you would provide that i can try that aswell but as i get the exact same issue i guess thats not a bios thing.

yes but no change unfortunately

I get on both sides 2.5 V at D3895. TBT_A_HV_EN is not there but at the same time i can see a question mark folder on external monitor plugged into J9400

Even if i start it and plug in the external monitor while its on i get only 2.5 V at D3895 but it shows a questionmark folder. So thunderbold is working i guess. Is there anything else i can check in a case like this?

I tested with a clean bios today but still the same behaviour. I am not sure but as far as i understand it couod be a TBT issue as the Voltage at D3895 is not correct. Should i try a new U3890?

As i want to disable thunderbold i want to check the voltage that U3890 prodces before i remove R3881 and after to make sure TBT is disabled. I measured without LCD and there are just 2,5 V at D3890 (both sides - diode mode measurement > 0,5 V at both sides - no short). That should be 12.6 V (if...

I have no board with bios on it here today. I?ill swap bios an monday (saying the original one). Could i also remove one of these instead of Q3880: R3881 or Q3805 or D3895? This should also stop thunderbold from working and would be easier to replace...

There is not really any corrosion on the cpu Side. It was just a little bit near U7200 and J4510 aswell as j3502 SMC Bypass did not help aswell

R7403 = 181,7 kOhm (should be 182 kOhm), there was no Corrosion in that area. R7402 is also exact 150,0 kOhm as it should be

This 820-3115 had waterdamage and wont start. I cleaned that and now it only starts if there is no monitor attached to it (internal and external). It i plug any monitor in fan just twitch once every time i press the power button. Without a screen it chimes but turns off after ~20 seconds. It...

Thank you for the answer. I did not know that there are only traces on the MLB, no intelligence. I guess thats why these keyboards are so expensive. I checked the traces on the MLB and noticed a few loose pins at J4500 even it looks fine and even i checked it after i cleaned the corrosion at the...

Trackpad works perfektly fine. So the keyboard itshelf is dead as the ekectronics on it cant really be fixed? Fans work normally though. Is it changable on these newer models same way as on the 2015+ AIR/PRO models? I never changed just the keyboard on these...

Hello, this 820-00239 had water spilled on it and was dead. I cleaned sone minor corrosion and it worked again except the touchbar. It showed everything fine on the OLED but touch was not working. The cable to J4402 was burned. So i ordered a new Touchbar and replaced the entire Touchbar LCD and...

Thank you. And waterdamaged boards after fixing them to make sure there is no corrosion left somewhere that i missed?

Update: I followed the missing enable back to U8010. It took me some time to get everything setup and wait for keyboard and trackpad to fail. U8010s input and enabe were there but output was only 0.02 V. I checked for a short but there was no. So i replaced U8010 and to be sure U8050 as it is...

I put every waterdamaged board and boards with eg. new SMCs (lot of flux) in the ultrasonic just to get rid of possible corrrosion under ICs and flux so it looks nice. You mean its incorrect to use sweep or not to use it? I`ll use sweep all the time... If not working Pin 38 (i measured the TP...

This happens from battery aswell. I dont use a adapter for my magsafe. Last time i checked all resistors and traces and put it also in my ultrasonic after i was done with it. So i cant find anymore corrosion. I also nitoced that if trackpad and keyboard wont work and i press power for 8 seconds...

Thank you for the answer. I actually didn?t rule out a bad cable. The original problem was "no Trackpad and Keyboard only in OSX" caused by an broken trace for SPI enable. And since i fixed that problem the still present problem with the "no trackpad and keyboard after standby" is there it was...

Unfortunately i need to come back to this one. The device was returned to me and mostly works fine. Just sometimes if the machine wakes from sleep (Not everytime) mouse and keyboard wont work (permanent not working mouse and keyboard in OS after waterdamage caused by a broken trace was the...

I cant see anything bad looking on the board but i know what you mean. Especially if the heatsink "burns" itshelf to the keyboard backlight and when for what ever reason the speaker/mic assemply sticks really hard to the upper case. So it may just be flex damage - even if The4 keyboard backlight...