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Ursprünglicher Beitrag von: Rany ,

Text:

There is a cable that links the board to the track-pad. Remove it from both sides and examine the tips (specially the tip that goes into the track-pad) under 10x-20x magnification.

If the cable is damaged/corroded (the golden prongs are corroded, missing) then you'll need to replace the cable. I had a case where the gold plating migrated from one prong to the other and shorted the cable. In which case you can use a fine needle to scratch the short.

Also make sure the connector on the trackpad (where this cable tip connects) is intact. And/or clean it with a soft toothbrush dipped in 90%+ isopropyl alcohol.

Let me know if any of the above helps.

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