I'm having an intermittent issue with a System 9 CPU board. I've narrowed it down to one of the 9-pin male headers used for the display. i replaced the female headers on the wire harness and re-flowed solder to the header pins on the CPU board. This fixed the problem temporarily, but after about the month the display began to glitch again. I am certain it is the header pins on the CPU board because if I just as much as touch the connector or the surrounding area with my finger the problem goes away. It is for sure a connectivity issue and is for sure at this connector on the CPU board. I made a second attempt to re-flow solder to the header pins, and again, it fixed the problem for a while, but now its back. Same thing, if I apply some light pressure to the connector at the CPU board the glitching stops.
That being said, I'm 99% sure the printed circuit, the part surrounding the hole that the male header pin sits in, is cracked. My thought is that even though fresh solder is connecting the pin to the surrounding circular area of printed circuit, there is a crack in the printed circuit around the hole that is only intermittently making a connection. This would be incredibly difficult to narrow down exactly which pin is the culprit because sometimes it works, sometimes it doesn't. Is there any other way to repair or correct this other than running wires from the header pin to its destination downstream on the CPU board? This would be difficult because in this case nearly all of the pins connect to an IC with very small solder points. Are there any other workarounds anyone has had success with?
Thanks!