[SOLVED]820-2663 no keyboard/mouse

[arnonabuurs]

Hi Guys I have a 820-3226 with no keyboard mouse. Tried with another keyboard and mouse, different working ones, same result. Goes to login screen and nothing works. Hardware test said there may be an issue with KBD/Mouse and Thunderbold. Mac had some liquid spill long ago and some IC dont look to good. I did check the Power to trackpad and keyboard, they have 3.3 as well as 3.42v. Also checked U4801 and resistors around it, seems all OK. Could it be that a short in the Thunderbold circuit freezes the keyboard and mouse as well? They both use 3.3v S4, but I did not see the lines connect with KBD/TRPAD in boardview.

 

[arnonabuurs]

Found a little piece of metal inside the Thunderbold port, removed it but that didnt solve the issue KBD/TRPAD issue, Thunderbold warning in ASD is still there so I will check these ports first.

Edit: when i check power on L3200 and 3300 I get 3.3v, schematics says its 15v. It only comes high if a device is connected or how to troubleshoot this circuit? There is a short to ground on 1.05V TBT "CIO" Switch and missing 1.05v. Anyway this can relate to KBD/TRCPAD?

 

[aprendiz]

820-2663, 820-3226????? What?

 

[Hellfiya]

He probably means 3662, I am having the same issue coincidentally on the same model

 

[dukefawks]

Forget about TBT.

Voltage on R4804 both sides?

 

[arnonabuurs]

Yes sorry for that 820-3662-03 it was late . R4804 Pin 1 = 3.314 and pin 2 = 3.327

 

[dukefawks]

Check if KB/TP are listed under USB devices. See if any other USB devices are missing/not working. Could be dead U4801 if everything else is ok. Check USB data lines to U4801 too, R4801/02.

 

[Hellfiya]

Any luck? I'm still having the similar issue that you have after changing the u4801 ic again, i also checked the resistors around pch

 

[arnonabuurs]

Hi, yes sorry for not com,ing back here, replaced U4801 and it worked again, thanks Duke!