F14 insert lights acting strange during game play

GameyMcGame

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Really weird....

Some of the insert lights (namely the 'V' bonus lights that go up and down the left and right side of the playfield and the special and bonus lights) stay on all the time during gameplay. More like, pulse so quickly they look like they are on...I initially thought maybe a bad transistor but...

During the attract mode where the beacons go on and there is sound, they sequence perfectly...

WTF?
 
Dug deeper. The erratic always on/fast pulsing is coming direct from the board so I've ruled out crossed wires under the pf etc.

Unless its a rom issue I'd assume it's a resistor or something else out of my depth. If I buy a new board would I be buying a CPU board or a power board? Thanks
 
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Just adding some resolution here in case anyone has this down the road...

the lamp pre-driver transistors were bad. Had them replaced and it works like a charm now!
 
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