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820-00165 water damage don't work keyboard and trackpad

2informaticos

2informaticos

Administrator
Staff member
No keyboard/trackpad on macOS, nor before?
Cannot acces boot menu?

Try known good trackpad flex/board.
At least inspect trackpad flex terminals and connectors.
 
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lincev

Member
I have cleaned the connector of the logic board again.

I have tried a new flex (trackpad to logic board) with new trackpad and new keyboard but same problem.

I can't access the boot menu. On the login screen, only the power key responds. Locking / unlocking screen.
 
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lincev

Member
With IOL Flex connected it does not turn on the computer, only orange light on charger but without battery. I don't understand.

I have tried a SMC reset (crtl + alt + caps + power button) and the charger responds. When I release the power key, the led changes to green and returns to orange.
 
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lincev

Member
SMC_LID level= 3.39v

EDIT: I have tried doing a SMC reset with shift crtl alt and power keys and the light turns green and back to orange. This means that it recognizes the keyboard and responds ... I don't know if this helps.
 
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2informaticos

2informaticos

Administrator
Staff member
SMC reset has nothing to do with basic function of keyboard; is implemented by hardware (inside trackpad board)!

Check R4830 and L4820.
Also check all resistors related with trackpad connector.
 
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lincev

Member
R4830=3,3v (without flex i/o board) and 0v (with flex I/o board) mode ohms value infinite
L4820= 4,98v (w/o flex i/o board)

I check R4850,51,52,53 is good.

I don't have R4841 and R4842. I have only R4843=0,02 (scale 200)
 
2informaticos

2informaticos

Administrator
Staff member
So 3V3_S4 disapperas when LIO flex connected?
Check diode mode at 3V3_S0 w/ and w/o LIO flex connected.
Did you try another LIO board/flex?
 
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lincev

Member
So 3V3_S4 disapperas when LIO flex connected? ---> If I connect the charger with the flex i / o connected, the fan does not work and I have no voltage. If I connect the charger if the fan works and at that moment I connect the i / o flex (I understand that it is dangerous) the tension is maintained and the fan too.

Check diode mode at 3V3_S0 w/ and w/o LIO flex connected. ----> don't have continuity with GND I have checked all the line in all the components of the board and I think I have done it well

Did you try another LIO board/flex? LIO flex and board is new (I have two boards, 820-00165 water damage, with same trouble)
 
2informaticos

2informaticos

Administrator
Staff member
"don't have continuity with GND"
Can you post the readings???
Not only pure short is bad!
As you have two boards, compare the readings...
 
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