Looking for some help here. Have a whirlwind with a lamp row lighting intermittently. Lamps work in test mode but just like gameplay they work intermittently, alternating between normal and dull or sometimes not at all. I have checked all bulbs, connections, diodes(haven’t checked under pf light boards) and the q80 transistor tests good. Any thoughts?
Thanks guys
Lee

Reflowed all light board connectors. Still no luck. No lights in the row work at when I first power it up but then they come on intermittently and flicker.

Voltage across socket is around 2v when working and no voltage when the lights aren’t working. Tested r113 and s1, they test fine. Diode at d4 has been previously replaced (not by me), also tests fine, but it’s signaling a previous issue with this circuit. Any thoughts?

No update. Ordered a new 2n5060 and a new 7406 from Marco. I’ll report back after install

Back at it. Sorry due to work schedule I only have time for my hobby during the winter.
Update; I replaced the 2n5060 and the lamp row worked in attract mode. Started the game and the lights no longer worked. Also no longer working in attract mode either. I assume the 7406 ic at U55 is bad causing the new transistor to fail again. Ill replace the diode and the r111 resistor as well while I’m at it. Should fix the issue correct?

Confirmed it is. Was previously replaced and socketed so I replaced it anyway. Still no lamps. If the old one was bad would it have blown the new 2n5060 transistor I installed? Waiting delivery on a resistor from Marcos to replace r111