Star Trek blue output wire?

jkoolpe

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Hey all!

The blue color output on my Star Trek upright has become a bit flakey of late. I've narrowed it down to the connector that plugs into the CPU board, but can't seem to figure out which of the actual wires (there are 10 going into this connector) is the culprit.

I'm pretty certain that it's the actual wire as I replaced the original IDE connector (in the picture) with a new molex connector last night but this did not fix the problem. And when I squeeze/manipulate the wires themselves (just above where they enter the housing), the color comes back but again, it's just not stable as I need it to be and still goes in and out. Note that I didn't get a chance to pull the board to make sure it's not perhaps just a cracked solder joint on the board itself, but I will do that hopefully tonight and reflow the solder if need be.

If it does indeed turn out to be the wire, does anyone know which of these 10 wires going into this connector (labeled as "P7" on the game) is the actual blue output (so I know which one to try to replace)? I know that one is blue colored already, but from my aforementioned manipulations of this particular wire, I wasn't able to confirm that this is the correct wire fore sure. And I can't seem to find anything online to help with this question, including in the manual...which isn't to say I might have missed it though ;) .

Still, any help is always appreciated.

Thanks,

JonathanIMG_0833.JPG
 
P7 has nothing to do with the monitor.
R/G/B/X/Y etc for the monitor come from the XY boards, not the CPU.

P7BLUE.jpg
 
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Hmmm....it sure seemed as though whenever I would manipulate/wiggle/squeeze the wires going into this particular connector is when the blue would come and go. Can anyone tell which wire that might be part of the other connectors going to the CPU board could be my culprit?

Maybe I should just try replacing the 3 other IDE connectors...
 
Some would say your basic mistake is using IDE connectors. LOL :vroam:

Don't be distracted by a red herring, or in this case a blue one.
If the BLUE on the monitor is flaky, then concentrate your efforts at the monitor or the XY boards / wires.
 
Gotcha...you may be right considering the CPU schematics do seem to indicate that none of the wires coming off of it should affect the color output. I do remember wiggling the connector to the monitor and I know I've reflowed the solder the input protection board to the monitor previously, but maybe I'll look at it again as these boards are notorious for bad solder pads. The main connector to the monitor is actually going into the old Biltronix display corrector board that allows monitor rotation to be able to play Tac/Scan via the multikit so that board should be OK, but it does still use the original input protection board also.

I can't say I like monkeying with anything that hooks directly into the G08, but I guess I have to in this case :) .

Jon
 
Y'all were right...it was one of the wires going to one of the X/Y timing boards that had come out of its crimped pin. Pulled the pin, recrimped the wire with a new pin, inserted it back into the molex housing, and that was that.

Thanks guys for steering me away from what was indeed a proverbial red herring :) .

Jon
 
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