Leaderboard

I tested the machine with another board to be certain and you are right Magik. I'm afraid I don't have a logic probe. I did a multimeter diode test which didn't help on the lamp transistors, but across the collector and emitter of T1 to T8 gave a reading of 0.6 in one direction and 1.8 in the other on all except on T3 - gave zero I did the same test on a known working board and all transistors gave the same results - give or take. I replaced this transistor T3 and the 2 lamp transistors that it connects to, T47 and T55 and it now boots, but several of the lamps are very bright and some flicker. The PSU has already been overhauled with new caps Is it now likely to be a faulty diode in a lamp holder that I guess then overloads the circuit and burns out the transistors?