Hi recently acquired a rocky Bullwinkle pinball. Have everything working except for a weird lamp issue. The controlled lamps that spell the word SELECT is always on. when it shouldn't. In single lamp test the Lamps in the world SELECT come on when other lamps are tested. e.g bot blue lamp in spin & win would also light the L lamp. drop target 1 lamp would also light the S lamp. I think its a bad diode somewhere but do not know how to proceed to pinpoint which one it
is. Or do i have to do the hard yards and test every single diode on the lamp matrix. Any help would be great. Cheers!

Thks Inkochnito. I thought non working transistor would render the lamp column non working? I have already replaced a few transistors on the board & assumed it was a diode problem because the lights were still working on the SELECT daisies. For future reference. lights always on also indicates a faulty driver or predriver transistor? thks for the help again. appreciate it!!

Hi again, I managed to change the q66(tip42) transistor but still no change in the lights. Did more test in single lamp mode & noticed that the select daisy letters do not always come on when testing other specific lamps. And it also comes on and different brightness levels as well during the test eg is on & bright when testing spin and win blue lamp, is also on when testing another lamp but is alot dimmer, hope you can understand what i mean. I also noticed that other lamps are affected which should not be on are also coming on in single lamp test. Should i go ahead and change the predriver transitor or do you think its another problem. Thanks again for the help. Cheers!! Much appreciated.

Hey guys, found the problem. disconnected all the lights in column 6 one by one and found that previous owner had changed the launch ball button to a
non standard one and did not connect a reconnect a diode to the light. Wired up a new diode and problem fixed. Thank you for Inkochnito & vireland for taking the time to assist a fellow pinballer. Thks a million & Cheers dudes!!