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Just finished a capkit on my Super Hang-on because of jail bars on one side of the screen.
To my disappointment they are still there (see photo).
This is a WG7900, what else can cause this? What should I test next?
Thank you!
Check the soldering of capacitor C57.

you may be over driving the guns in the tube.
also did you change the 3 bipolar caps on the chassis.
they are in the color circuit.
Peace
Buffett