I have a Gallag board that doesn't seem to be working. It was working ok for quite a while, but than it started acting up. It started with the score screwing up, than the picture would freeze up every now and than and finally the screen just went white. I tested the voltage at the connection on the board and I set the power supply for both 5.1 & 5.2V, neither seemed to help. I took the board out and cleaned all of the chips and put them back - I believe there were about 15 that I could remove - still nothing. Is there anything else that I could test? Should I try replacing some of the chips? If so, where can I purchase replacements? I really would like to get this thing going, so any help would be greatly appreciated.