DangerMouse

Hi everyone, I have an atari 2600 dart vader that has no video output, it was bought as faulty but would love to repair it. I am getting 9v and 5v on the voltage regulator and have replaced the riot chip and resokdered all solder points but I'm still getting nothing I am plugging into the tv directly with no switch box. The board is a v5, can someone tell me what to check next please?