hello
i have a a1502 the trackpad and keyboard does not work i have tpad_3.3v_s4 and also 3.42v.i dont see any corrosion on the board what should i look for . also i put another keyboard still same problem.i believe there is a firmware rom in the trakpad which enables keyboard so if the trackpad is bad the keyboard also does not work.

820-4929 ??


Check the cable and data buses between the MB and the trackpad, smbus - spi

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a1502 820-4929 trakpad and keyboard Can I use it?

hi the problem was the trackpad works on i2c the eeprom on the trackpad was bad but i used a new trackpad now works fine .thanks case closed