Test a loose 128 x 16 display glass

Steps

• Turn the game off and lower the display panel.
• Clip a jumper from either lead of C29 (near U15) on the display board to one row pin of the glass under test; this supplies -100 V. Rows come out on both sides, each side serving half the glass.
• Clip a second jumper to the banded end of CR2 (the +68 V point) and fit a 33k 1/2 W resistor on its free end.
• Power up and touch the resistor to a column pin on the same half as the row: the dot where they cross should glow.
• Run the resistor along the column pins for a quick check of that half.

The display power supply carries about 100 V or more; work on it with the game unplugged and let the capacitors discharge.

Systems

• Data East CPU Version 3

Games

• Batman
• Checkpoint
• Hook
• Star Trek
• Teenage Mutant Ninja Turtles

Related tips

• Small 128 x 16 display connector J2 pinout
• Small 128 x 16 display looks garbled
• Small display much too bright (wrong D10 on a -00 supply)
• Replacing R95 on the small display board without lifting traces
• DMD shows lines or garbage and no controlled lamps light
• Which DMD brands are hit by a blown lamp fuse
• Dot matrix shows lines or lights solid, and no CPU lamps work
• Medium 128 x 32 display connector P1 pinout

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)