Sega Apollo 13, whitestar.
Bought the game with a broken Q32 this drives the 4 rocket flashers (#89s: 2 under the rocket, 2 in the backbox)
The flashers under the rocket looked like this (see image attached).
Luckily I had this in spare so I replaced that part including the cable and connector towards the playfield below.
I measured from the connector (without lamps) and I had no short on that plastic with 2 flasher sockets
When I reinstalled the power board with the replaced TIP122, everything worked including those flashers for a few minutes. So when I did solenoid and flashers test, all worked ok. Also in game.
Then suddenly, they started being locked on again.
Ok so replaced the TIP122 and the driving IC U4 (HCT273). Checked resistors R215 and R32 their values but again the same thing happened.
The last time was after 3 full ok games with all the flashers operating. I shoot the ball in the right saucer and play the video mode. When video mode is over and ball is kicked out the flashers are locked on.
Any help please, I'm really stuck now what to look for.
The strange thing is that they work for a while, even after the moving parts moved (like rocket flasher, moon, ..)
Is 4 flashers too much for a TIP122? Should I led them or what else could be the problem?
(semi) shorted flasher sockets? Bad #89 bulbs ..?