tnglc79
Member
I just picked up a Ms. Pac/Galaga today and it was half working half not. The image on the left side of the screen is smaller than the right side. It was also turning to a white screen after a couple hours.
I did a full cap job, double and even triple checked my work and reflowed all the rest f the boards and am sure that it is a solid job. This is definitely not my first rodeo. Now the monitor has been on for six hours still doing fine and not dropping signal but the image is still smaller on the left side. I also cannot move the position any closer to the left edge.
I have tested this chassis on a known good board, known good monitor, and a known good neck board. Same results in any configuration. So the problem must be on the main board.
Tested all test points and getting good numbers. Checked pin 9 of u601 and got 28v.
This is only the second 7400 I have messed with. Am I missing anything or have any of you all fixed this problem? Any help appreciated.
I did a full cap job, double and even triple checked my work and reflowed all the rest f the boards and am sure that it is a solid job. This is definitely not my first rodeo. Now the monitor has been on for six hours still doing fine and not dropping signal but the image is still smaller on the left side. I also cannot move the position any closer to the left edge.
I have tested this chassis on a known good board, known good monitor, and a known good neck board. Same results in any configuration. So the problem must be on the main board.
Tested all test points and getting good numbers. Checked pin 9 of u601 and got 28v.
This is only the second 7400 I have messed with. Am I missing anything or have any of you all fixed this problem? Any help appreciated.
