Acer 5515 Works off Battery, Charges, but will not run off AC
This unit arrived working from a charged battery, but will not power on from AC. My first thought was bad leg on the DC Jack, Easy job! Finally Upon opening the case and removing the keyboard I saw the beginning of the failure. Burnt MOSFET under the keyboard directly behind the battery connector. So took the rest of the panels off to see how bad it was. Out of a scale of 1-10 with 10 being the most difficult I rate this as a 7.5 because it was more annoying than difficult. The copper under the MOSFET was actually welded to the legs of the FET, heating solder would not break the weld. Click to see larger image The visual shows almost the worse case scenario for a shorted MOSFET. Burnt and totally unreadable numbers. Seeing the circuit I surmised that it was an identical pair of chips but I had to verify against another motherboard to be sure. Also there was a scorch mark under the keyboard, but it didn't affect the keyboard or any keys. ...