Space Duel Board - no horizontal signal

Black Matrix

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Dec 21, 2006
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Hey all,
My friend has a pcb that has one vertical line from the top of the monitor down to the bottom. So basically, the Y axis is working, but there is no X. Its missing the horizontal. The monitor is good, tested, and bullet proofed out the wazoo. So my question is, does anyone know what on the PCB would cause a collapse of the HOR or X-axis graphics. Thanks in advance.
 
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