Normal CPU board LED sequence at power-on

The CPU board has three LEDs: blanking (left), +5 V (middle) and PIA (right). At a good power-on the PIA and +5 V LEDs light at once, the PIA LED goes out after about half a second, then the blanking LED comes on. The +5 V and blanking LEDs stay lit while the game runs.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• PIA LED lights, goes out, then lights again
• Display EPROM version appears, then nothing more
• Game will not boot: GI on, little else happens
• Other CPU jumpers and what they set
• Bench-testing a CPU board on +5 V
• CPU boards are only downward compatible
• CPU EPROM jumpers J4 and J5
• All lamps come on, flipper fuse blows and the game won't boot: failed replacement NVRAM

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