The manual is very good quality. very good graphics. complete
Text excerpt from page 31 (click to view)
Main PCBs Trouble Diagnosis
A. When �No signal� in CVBS(RF, AV) 1) First check if other inputs are working -> if other inputs are not working, replace MAIN PCB 2) Checking waveforms with Color Bar Pattern(Using the oscilloscope) - Main TP(RF) : CC455, C102
