Quick lamp row check: ground the row transistor tab
The lamp row transistors are at Q72 to Q79. Put the game in its test menu, in any test other than a lamp test, and clip a jumper from ground to the metal tab of one of them; every lamp in that row should light.
Systems
Related tips
- Lamp matrix fault with good transistors: check R55 to R62
- Lamp row still dead after a new TIP122
- Test each lamp column driver with a test lamp
- How the CPU-controlled lamp matrix is wired
- A whole row or column of lamps is stuck on and extra bright
- A row of lamps stays on solid, works if the plug is pushed sideways: repin the header
- Lamp column still dead after a new TIP42
- Lamps glow dimly when they should be off
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Three, Clay Harrell (pinrepair.com)