Cut off the line output, 60 w bulb for load, is 113 v + B, is normal. Doubt line output transformer is damaged, change new transformer fault remains. Dial the deflection coil and the tail plate and connected line load, + B is normal, to restore the original mechanical and electrical and disconnect thyristor Q902, screen appears horizontal belt. Disconnect resistance and connected to Q902 R761 a foot, matt still silent. After replace ZD753, ZD752, grating but remained silent. Check R761, R761 has changed value of 1 k Ω, with o. 5 Ω, 0.25 W resistor replacement troubleshooting.AaQservice manual download site