Through inspection is poorly insulated and sparking discharge line output transformer have holes. Change the line output transformer after boot. Have sound, filament light, there is high pressure startup, various voltage is normal, but no character display the black screen. Measurement realizes visual board to R, G, B. By high accelerating voltage, a partial red back to sweep line grating. As the cause of the problem is the ABL circuit D406 stabilivolt breakdown. Voltage value is 8.2 V, change after everything is ok. Every line of the output transformer lighter is serious, ABL circuit D406 will be bad.j39service manual download site