Who's CT100 is this?

[Electronic M]

The schematic is here.
http://oldtubes.net/library/free_man...assis_CTC2.pdf
And further service info and alternate versions of the schematic can be found here.
http://www.earlytelevision.org/tv_sc...color.html#rca

Get or borrow an oscilloscope and trace the signal forward tube by tube from the DVD player's input (to the set) to the base of the CRT. The point in the chain where you loose the signal will be just past the fault. So once you loose the signal back track part by part until you find the exact place the signal is lost. Then test and or replace all parts in the area of the failure. Signal tracing like this is probably the most simple and direct approach there is to this....Voltage and resistance checks on all the video stage tubes and CRT versus the schematic may also help move you towards a solution.