According to the symptom, whether CRT high voltage is not added, so you should check step by step forward from the high voltage circuit. Use oscilloscope Q305 collector, without changes, and Q305 does not start; after going forward Q311, Q310 no waveform output. Final check manifold LA7851 of subsection (12) pin no waveform output. Integrated LA7851 (12) foot line oscillation output, no waveform outputs LA785 line oscillation circuit is corrupted; yet output at the field oscillation waveform description field oscillation is working properly. Oscillation circuit without output waveform line amplifier, action driven, high-pressure and the horizontal output section are not working properly. Welding LA785 after the replacement, troubleshooting.