This machine has a sound, power indicator light, indicating that the power supply circuit is normal, no raster line scan circuit or malfunction should CRT circuit. Charles CRT filament is not lit, the measured filament voltage is 0V, the measured output transformer T4321, 3 ends of voltage is 0V, and check the output pipe base voltage is 0V, line scan circuit did not work. Charles LA7688N {24} pin voltage is 0V, the measured {24} feet on the ground positive and negative resistance is 0 ª¦, severe short circuit; Cha {24} feet normal peripheral components, {24} feet

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