[SOLVED]820-00165 No Trackpad or Keyboard after Backlight repair

[AaronH]

I have an 820-00165 that came in fully functional except for backlight. Trackpad & keyboard definitely worked.

I found corrosion all around U7701, which was badly damaged at Pin 5 (PPVOUT_SW_LCDBKLT_FB). I replaced the driver which fixed the backlight, but now the trackpad/kb are completely inop. I have checked for damage to the cable and the connector. The rest of the board looks clean as well, like a single drop of water went straight to the backlight driver and killed it.

 

[larossmann]

What voltage do you get on pin 10, 14, and 19 of J4800?

After that, the magical question: if you hold down the option key upon turning it on, do you get to the screen where you can select a boot device? Do trackpad & keyboard work here in this screen? Can you hit left & right to select other boot devices and move the cursor around and click them? If so, I leave this for duke.

I'm also assuming you already tried another flat cable/trackpad/keyboard at this point that are known good.

 

[AaronH]

J4800
Pin 10: 3.32V
Pin 14: 5.10V
Pin 19: 3.40V

Option boot works, can use trackpad & kb here just fine. Tested arrows, wifi login, etc

I have not tested another cable, trackpad, or kb due to lack of testable parts. Seems these are probably OK though since they work in the Option boot menu?

EDIT:

OK since measuring the kb connector pins and letting it sit in the option menu to think about its life for a few minutes, I rebooted it normally and everything works. Mark this one solved i guess? This one definitely won't come back. Nope. Not a chance.