Never swap small and medium DMD power plugs

The 128 x 16 and 128 x 32 display glasses use the same style of power plug, but the pin order differs. Plugging one display into the other kind of supply destroys it.

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
• Data East/Sega CPU Version 3b

Related tips

• Small and medium DMD power supply CN5 pinout
• Voltages a small or medium dot matrix display needs
• Large 192 x 64 DMD power supply CN5 pinout
• Checklist for a dead small or medium dot matrix display
• DMD dark after work in the backbox: transformer wire pulled out of its plug
• Small 128 x 16 display connector J2 pinout
• Medium 128 x 32 display connector P1 pinout
• DMD shows lines or lights up fully, and no CPU lamps work

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