toshiba laptop touchpad faulty

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I changed the mainboard of the laptop, touchpad made the pc
continuosly beeping, I moved it few times until it sparkled and since
then no more working touchpad. The touchpad stil works correctly with
the old mainboard (see old 3D about it not working when connected to
external power supply/adaptor), but something on the new motherboard
is gone.

How many chances do I have to identify what's wrong and make a working
mainboard from two faulty? /

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