SE/30 Diagonal Lines

[CompuNurd]

Just opened up my SE/30 from eBay today, it booted to a screen with lines on the top and checkerboard at the bottom (caps). I turned it off, then turned it back on to take pictures for this forum... it booted right up! The only issue is some flickering lines on the bottom and top of the display. I smacked it on the left side, and they went away. I kept tapping, and the screen went to all diagonal lines, then went away when I tapped it again. I would guess this is a cracked solder joint somewhere, but where? I also noticed the clip for the connector from the A/B to L/B was broken off, so could it be that?

If it helps, the video board wasn't connected to the CRT when I cracked it open. It could have been like that for years, or just thrown around by the shipping company. Could there be a loose wire on the video board, or could the pins on the CRT have oxidized enough to cause issues?

 

[Elfen]

Reseat the socket back on the CRT. Most of the time they are hot-glued in place as they do come loose over time and when moved around.

You need to check the analog board and look for bad solder joints at the connector and the top part of the board where T1 is at. Clean up by removing all the solder on the broken joint and resolder the joint. Adding solder to the broken joint or reheating the joint will not fix it as it will break sometime soon after you turn on the machine; most of the time a reheated joint wont hold at all though it look like it is.

Also, clean up and desolder the other joints on the connector and area around T1, like if the cap has 1 bad solder joint, clean both joints on the cap. This is because though the joint may look good, it has weaken over time and fixing the affected point will add stress to the weaken point. This way you strengthen the entire piece on the board and not just at one point.

Also check for charring and burning about the connector and the area around T1.

 

[wthww]

Hi CompuNerd,

I've moved this thread to the best forum for it.

//wthww