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MECCER ack-202a. Cable came out from the keyboard

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How to weld the cable back to the board

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Hi Moses. The best way would be first find out your two power wires (+5v & GND) using a multimeter or by checking if the lights blinks at power on. After which you can then try the other two remaining. The pinout is sadly not standard as different keyboard vendors used differing color codes. Refer here
http://www.instructables.com/id/Turn-a-Trackpad-From-a-Broken-Laptop-into-a-PS2-M/step3/Cofirm-Pinout-of-PS2-Cable/
for more on this.
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