Originally Posted by LC8rider
Changed my 550 digitizer last night. Thanks for post. I bought 2 digitizers from china just in case one of my friends 550 failed. Turned out I needed the second spare myself. The first digitizer would not calibrate. The dot went round and round for ages and sometimes moved by itself without being pressed. The second one calibrated very quickly. Fast, precise screen operation at last!! Noticed a rip starting on the on/off rubber. I can seal this off and just use the 12v to power up and not the battery.
Just did mine, had a similar issue. Figured out that I didn't have the rubber seal down just right, it was causing the problem. Repositioned it, and all was good.