The touchscreen on my blade has been playing up for ages. It got worse today, so I took the plunge and completely disassembled it, and put it back together, based on these instructions.
Although hard to see in these pictures, there are 5 little foam oval widgets, 2 down one side of the board, and three down the other, each covered with a silvery conductor. The ones on the side with 3 make contact with a lead with bare patches adjacent to these widgets. If you look carefully at Picture 5 in the first posting, you can see the lead on the side with three, running down the edge - one contact is near the mid-height of the battery housing, and the other two are roughly at each end of the battery housing.
At least one of these was not located properly. I reseated them all carefully with tweezers, making sure they contacted the wire properly, and also for good measure disconnected and reconnected the connector shown in Picture 3 in the first posting. I then reassembled everything, and - touch wood - the touchscreen has been working much more reliably since.
Edited by Ralph Martin, 09 May 2011 - 07:26 PM.