[SOLVED]820-3115 with couple of keys not working

Have a headache-inducing 820-3115 that had no liquid damage, but the keyboard wasn't working properly (keys 7,8,9,u,i,o,j,k,l,m, comma, period, left and right arrow) not working. sometimes, when i press the m-key, the trackpad registers a click (whatever the cursor is pointing at, gets clicked upon key-press)

Of course i suspected the customer probably díd spill something, so tried a known-good keyboard, but no dice.
Have ofcourse tried several other new keyboards (4 in total), but the symptoms are the same.

I have tried two different J5713s and have tried swapping the U5701 with another one (only once, so might try again).

Was wondering if anyone knows which WS_KBD lines i should suspect, since it seems pretty obvious to me that one set of them should be the culprit.
I cannot find any documentation on which lines represent which keys.

anybody have some pointers?
 
Last edited:
below diodemode readings on U5701 (compared to another 3115 that just came in with working keyboard, and no differences

. [TABLE="border: 0, cellpadding: 0, cellspacing: 0"]
[TR]
[TD="width: 92"]pin of U5701[/TD]
[TD="width: 87"]voltage drop to ground[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD].510[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD].865[/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD].860[/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD].859[/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD].858[/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]7[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]8[/TD]
[TD].869[/TD]
[/TR]
[TR]
[TD]9[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]10[/TD]
[TD].863[/TD]
[/TR]
[TR]
[TD]11[/TD]
[TD].860[/TD]
[/TR]
[TR]
[TD]12[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]13[/TD]
[TD].859[/TD]
[/TR]
[TR]
[TD]14[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]15[/TD]
[TD].861[/TD]
[/TR]
[TR]
[TD]16[/TD]
[TD].863[/TD]
[/TR]
[TR]
[TD]17[/TD]
[TD].860[/TD]
[/TR]
[TR]
[TD]18[/TD]
[TD].866[/TD]
[/TR]
[TR]
[TD]19[/TD]
[TD].0[/TD]
[/TR]
[TR]
[TD]20[/TD]
[TD].845[/TD]
[/TR]
[TR]
[TD]21[/TD]
[TD].853[/TD]
[/TR]
[TR]
[TD]22[/TD]
[TD].408[/TD]
[/TR]
[TR]
[TD]23[/TD]
[TD].873[/TD]
[/TR]
[TR]
[TD]24[/TD]
[TD].875[/TD]
[/TR]
[TR]
[TD]25[/TD]
[TD].863[/TD]
[/TR]
[TR]
[TD]26[/TD]
[TD].863[/TD]
[/TR]
[TR]
[TD]27[/TD]
[TD].862[/TD]
[/TR]
[TR]
[TD]28[/TD]
[TD].863[/TD]
[/TR]
[TR]
[TD]29[/TD]
[TD].881[/TD]
[/TR]
[TR]
[TD]30[/TD]
[TD].880[/TD]
[/TR]
[TR]
[TD]31[/TD]
[TD].879[/TD]
[/TR]
[TR]
[TD]32[/TD]
[TD].878[/TD]
[/TR]
[TR]
[TD]33[/TD]
[TD].875[/TD]
[/TR]
[TR]
[TD]34[/TD]
[TD].876[/TD]
[/TR]
[TR]
[TD]35[/TD]
[TD].874[/TD]
[/TR]
[TR]
[TD]36[/TD]
[TD].875[/TD]
[/TR]
[TR]
[TD]37[/TD]
[TD].872[/TD]
[/TR]
[TR]
[TD]38[/TD]
[TD].874[/TD]
[/TR]
[TR]
[TD]39[/TD]
[TD].871[/TD]
[/TR]
[TR]
[TD]40[/TD]
[TD].873[/TD]
[/TR]
[TR]
[TD]41[/TD]
[TD].872[/TD]
[/TR]
[TR]
[TD]42[/TD]
[TD].871[/TD]
[/TR]
[TR]
[TD]43[/TD]
[TD].864[/TD]
[/TR]
[TR]
[TD]44[/TD]
[TD].870[/TD]
[/TR]
[TR]
[TD]45[/TD]
[TD].865[/TD]
[/TR]
[TR]
[TD]46[/TD]
[TD].869[/TD]
[/TR]
[TR]
[TD]47[/TD]
[TD].865[/TD]
[/TR]
[TR]
[TD]48[/TD]
[TD].871[/TD]
[/TR]
[TR]
[TD]49[/TD]
[TD].409[/TD]
[/TR]
[TR]
[TD]50[/TD]
[TD].0[/TD]
[/TR]
[TR]
[TD]51[/TD]
[TD].686[/TD]
[/TR]
[TR]
[TD]52[/TD]
[TD].817[/TD]
[/TR]
[TR]
[TD]53[/TD]
[TD].674[/TD]
[/TR]
[TR]
[TD]54[/TD]
[TD].862[/TD]
[/TR]
[TR]
[TD]55[/TD]
[TD].507[/TD]
[/TR]
[TR]
[TD]56[/TD]
[TD].505[/TD]
[/TR]
[/TABLE]
 
Last edited:
Jesus on a stick holy mother of god...
I am actually too embarassed to share this, but for the sake of helping clueless souls like myself i will share my being abso-fucking-lutely trolled by this Mac:

There is a software-'feature' called 'mouse keys'...
It was ticked under System-preferences.
This can be triggered (if enabled) by pressing the Alt-key 5 times in a row.

My fucking god. I swear, I'm going to throw myself against the wall for measuring and soldering on this fucking board.


I am so humbled.. hope someone with similar issues will find this thread before prodding around as much as i have.
 
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