I thought they 'just work'.
I would suggest bringing it to the Wanchai Computer Centre 130 Hennessy Road, MTR WanChai Station Exit A4, turn left. There are a few laptop repair shops up on the 2nd floor. Just go door to door and see if you can find anyone you like the look of
Or try Golden Computer centre and do likewise.
I dealt with Elite in Central, who were fantastic, but they went out of business as a result of their involvement with the Edison Chen rude photo affair.