Horizontal lines on SE/30 Display

[mmaseda]

I’ve been working for a while trying to determine the cause of very faint horizontal lines that move from the bottom to the top of the CRT every few seconds. While I can see them perfectly with my eyes I’ve had a hard time documenting them in a photo or video. Here is my best attempt to capture them in a short video. I don’t have a good camera where I can fine adjust the shutter speed so this was just done on my iPhone. I can reproduce this on several SE/30 and SE computers and I have an idea what might be causing it but would rather not get into that at this time until I can get someone else to confirm they have also noticed this.

Manuel

 

[ArjenCNX]

Video ram comes to mind here, check the Vram chips and make sure there is no capacitor spillage around them, and that the Vias are OK, a few gentle taps on the board can sometimes expose bad connections.

 

[mmaseda]

Thanks but that isn’t the problem. I can recreate this problem on multiple computers each with a different logic board. At this point I’m just trying to see if anyone else has every noticed the problem before.

 

[ArjenCNX]

yeah, that solidly excludes that option indeed, just considering the way it works, it would be possible that there is a soldering issue on the motherboard somewhere along the video signal as in comes in, some percussion there may show you something, as could cooling things down with some canned air. other then that i'd have to have the unit in front of me to say much more useful things. Best of luck though!