Hi Sam,
Recently looked at a 32AV600 with a different fault, where supplier wanted $330 AU for a main board....yeah ,right.
Look for a BL-ON or INV-ON pin and see if it's getting around 3VDC and holding. If yes, might be a case of gutting the panel to the point where you can observe the backlights, and in that 1 second window, check if any CCFLs are not igniting, or giving a pinkish glow. Might have to turn TV off and on a few times to capture all the CCFLs in action. Bruce