820-4924-A Power-Button no function, button on R5116 works

[mbcontrol]

Hello, i'm working on a 820-4924-A. It came in with 3 damaged/exploded Caps on the Daughterboard/Audioboard. The heat was burning a hole in the keyboard-backlight-sheet near the power-button. I changed the daughterboard an flex - the machine is running. Only the power-button don't work. A test with a known good keyboard shows the same problem. So i think it's not the keyboard.

With a button on R5116 overething works fine.
smc_onoff_l = 3,429v

 

[2informaticos]

Check the continuity to the corresponding keyboard connector pin (5).
Be sure R4810 is good.