Monitor problem..Unless you smack it.

[usedelectronics]

I have a newer namco cab with a strange video "issue".
The monitor powers up, but displays the whole image in about a 1/4" line right across the middle of the tube from left to right.
If you smack the cab "just right" the video goes back to nearly normal(a tiny bit jittery). However, after some rigorous gameplay it goes back to flatline.
I checked for obviously loose cables, and disconnected-reconnected them all, but it didn't help.

Any advice?

[MonitorGuru]

a - loose wire attached to the vertical windings of the yoke or to the chassis board (yellow + green wire set)
b - cold solder joint in the vertical deflection circut or under the connector where the yellow/green wires connect.

Do NOT run your monitor with it in the collapsed state.  ALL of the screens electrons are being bounced around within 1/4" vertically instead of across ~ 13" vertically, so that stripe of screen is being burned in at least 50 times faster than normal use and would result in a burned in image of a stripe across your tube.

[Ken Layton]

Yep, sounds like cold solder joints on the monitor circuit board or possibly the female pins in the yoke connector are loose.

[usedelectronics]

You guys are great.
Found a horrible cold solder joint on the green wire to the yoke.
Removed, cleaned and resoldered. Works great now!

Thanks!

[Ken Layton]

Glad to hear that it's now fixed!  

[crashwg]

wish i had known this about 6 months ago.... before i threw away that 27" rca tv with the same problem