the 12v line is going WAY out of regulation. Something is still bad in that analog board.
Your going to have to test every component in the feedback circuit, starting with the voltages on the LM324, plus the 6.2V zener to make sure its not open.
Your going to have to test every component in the feedback circuit, starting with the voltages on the LM324, plus the 6.2V zener to make sure its not open.