[SOLVED]820-3437-B keyboard start problem

[macfix]

Hello

I'm working on 820-3437-B board was liquid damaged around trackpad (board is looking totally clean) Computer can not starting from keyboard but if battery not connected when plug magsafe adapter starts(its normal i know) and works normally . When touch power button ( not long press only one sec is) computer stop working and totally dead ( not magsafe led or any sign of working).

Tried knows good keyboard, trackpad, trackpad flex,battery and I/O board nothing changed.

SMC_ONOFF_L is 3.3V and when battery connected short it to ground doesn't start computer ( normally must be start) also replaced SMC nothing change...

Note: When start computer plug magsafe cable without battery; if you press power button computer stops 1 second and start again him self.

Any idea for check next step

Thanks

 

[dukefawks]

SMC_LSOC_RST_L is being pulled down. So corrosion around U5110 or trackpad connector. If that is clean it MUST be the trackpad or flat cable or both.

 

[macfix]

Thank you very much Duke. After replace track pad connector from board side problem solved.