I have a krull which was dead and is very similar to Q-bert. I replaced the bridge rectifier, filter cap and used a new resistor that is soldered on the cap. On my krull all the wires were directly soldered to the power brick. I did not resolder wires but added connectors like most games. Because of the BR failure one of the connectors to the power supply burned. It had the crappy insulation displacement connectors so I replaced with crimp ons. Replaced caps and a few transistors on ps board and now it works perfectly.
