Do you have the feature lamp bus wire connected to the lamp driver board? It is not in the picture and without it the lamps are going to flicker like crazy. Adjacent lamps will light dimly because when the feature lamp bus trace on the board is not connected to anything it is high Z and the you get back feed through the load resistors.
Included with lamp board is two or three pin connector. Attach it to LDB J5 and the feature lamp bus (6VDC).
Put the game in lamp test. If the 6vdc light on the lamp board is blinking totally on and off, you don't have the feature lamp bus connected right. If it is solid on (but dims slightly) in lamp test, you have it on right.
MPU J4 to driver J4 for wrong solenoids.