820-3209 - Trackpad can click, but erratically moving or not

[Adan]

Hi, I have a problem with a MBA wich was water damage. I changed the trackpad, the trackpad's flex cable and ultrasonicly cleaned the board. The new trackpad can click, but erratically moving a while after the boot or not moving at all at some points.

-I tried different trackpads and flex cables, same issue

-I get 5.12 volts on pin 10 of J5700

-I checked the continuity inter J5700 and the trackpad, it's fine.

-Voltages on D+/- and Y+/- match

-I replace two times U5700


Does somebody can give me any help iyp ?

 

[G.Beard]

Hi, I have a problem with a MBA wich was water damage. I changed the trackpad, the trackpad's flex cable and ultrasonicly cleaned the board. The new trackpad can click, but erratically moving a while after the boot or not moving at all at some points.

-I tried different trackpads and flex cables, same issue

-I get 5.12 volts on pin 10 of J5700

-I checked the continuity inter J5700 and the trackpad, it's fine.

-Voltages on D+/- and Y+/- match

-I replace two times U5700


Does somebody can give me any help iyp ?

Are you sure you have not replaced the trackpad with another shit one?... This kind of bullshit hapens to me al the time.
Have you inspected the T-PAD connector properly?
You may not see the link but, sometimes a bad battery can cause this. Sometimes bad charger.
Is you fan ramping up?
Have you tried another SSD?

 

[Adan]

Thanks. I tried tree different t-pad, same shit.
I inspected the T-PAD connector with the microscope, open and close, it looks fine.
Tried with an othe battery and an external SSD, the same.
The fan is spiding normaly.

This problem does't occur with an external mouse.

 

[dukefawks]

R5730 is suspect or corroded trace from there to connector. Same goes for L5720 and the trace. Are you sure there is no crap in/under J5700?