Chosen Solution
I got a broken iPhone from eBay, when I put it back together it worked ok, but a ribbon cable on the dock connector assembly was broken. The microphone etc. did not work. I bought a “new” dock assembly on eBay, but since putting everything back together again the screen lights up and displays the unlock slider about every 20 seconds. It does not do this when playing music, or when plugged into the computer. Having googled it looks like it might be a faulty dock connector - does anyone know whether or not this is the case? I also replaced the headphone assembly and vibration motor, but I installed these yesterday before the dock connector.
I’ve established that is is the dock connector. A message briefly flashes up now about an incompatible accessory, and when I use the old dock connector it works fine.
Mmm.. It can’t be the Dock connector, it must to be a slack screw, make sure the board is fastened by all the screws, if its not, wash it it isophropylical alcohol, but its definitively not the dock conector. :D
