Video Problems


No picture

Scrambled Picture

Missing colors or washed out color

Picture too large, too small, or off center

Video image is flipped

Bad images in picture

Diagonal white lines

Probable Cause

Check Dip switches.

Bad connection. Monitor.

JAMMA Harness connected improperly.

Missing sync connection or misadjusted monitor.

Bad video connections.

Misadjusted monitor. Misadjusted monitor.

Bad GROM. GND problem.


SW1-Dip switches, 1 thru 4 must be "ON".

SW2-Dip switches 1 and 2 must be 'ON', and 3 and 4 must be 'OFF'

Make sure there are good connections from the board's video outputs to the monitor's video inputs.

Make sure the monitor is operating correctly. (Check it with another compatible logic board.)

Identify Pin 1 on the JAMMA connector and on the PCB. If installed incorrectly, damage to the PCB may have occurred.

Check the sync connection - Adjust monitor

Check the video red, green, and blue connections.

Adjust the monitor, not the board. (Refer to your monitor manual.)

Adjust the monitor, not the board. (Refer to your monitor manual.)

Reverse the monitor's convergence wires or flip the monitor 180°. (Refer to your monitor manual.)

Do GROM test. Check IC pins to make sure none are bent over.

Earth and Logic GND's should be connected at the power supply.

Bright, blurry, or rolling picture Misadjusted monitor.

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