K7191 with cold solder / loose connection I can't track down

dondigital

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K7191 with cold solder / loose connection I can't track down

So I've been rebuilding a k7191. Started out the monitor had no red, needed a cap kit bad, and when I bang on the frame it jitters (so there is some cold solder somewhere or loose connection).

Found cold solder joint on the red input pin, that fixed the red and capped the monitor. Looks bright and beautiful now...but the jitter is still there when I bang on the frame.

I reflowed all of the input pins and really looked hard for any old / cold solder. I reflowed a bunch of connections that looked a little suspect but there was nothing outright obvious. I'm wondering since it's a jitter in the sync of the picture if there is a particular area of the board or path I could focus on to try to track this down?

Any ideas?
 
Did you eliminate wires/crimped on contacts-pins as a cause? (Jiggle the wiring harness and see if you get the jitters.)
 
Ya. I'm using a signal generator and I know that, it's harness, and the tube are fine. Been fixing a bunch of chasis with the same setup.
 
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