I have a punchout machine that has been sitting for 2-3 years. Both monitors turned when last used. I finally decided to start restoring it and when I turned the machine on, the lower monitor does nothing. I tested the transformer that the monitors plug into and it is working fine. I removed the monitor from the cabinet and removed the board from the chassis. I did a deluxe cap kit, but I do not think that is going to fix the problem. What should I look into next?