| 摘要 |
A display unit comprises a video amplifying circuit for amplifying a video signal and outputting the amplified video signal to a cathode-ray tube, a sync separation circuit, a deflection circuit, a high-voltage circuit, a synchronizing signal control circuit for judging whether a synchronizing signal outputted from the sync separation circuit is present and outputting a signal indicative of the presence or absence of the synchronizing signal therefrom and having a synchronizing signal control switch for permitting the supply of an output indicative of the absence of the synchronizing signal at all times as needed, a power source control circuit for opening and closing a power source circuit in response to the output of the synchronizing signal control circuit and a power switch electrically connected to a power terminal. The sync separation circuit, the synchronizing signal control circuit and the power source control circuit are directly supplied with source power from a power source through the power switch and the other circuits are supplied with source power from the power source circuit.
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