Importance

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Abstract

In a television receiver, a microprocessor controls a horizontal deflection circuit which is coupled to run mode power supply to define a standby operating mode and a run operating mode. The microprocessor has a power-up reset input terminal which initializes operation upon application of AC mains power. The run mode power supply is coupled to at least one load which is subject to overcurrent or overvoltage faults. A fault detection circuit detects fault conditions in the run mode power supply loads such as overvoltage or overcurrent and anomalous vertical deflection current. Upon fault detection the fault detection circuit triggers a power up reset circuit which applies a momentary reset pulse to the power-up reset input of the microprocessor. Upon receipt of the reset pulse, the microprocessor controls the horizontal deflection circuit to place the run mode power supply in the standby operating mode. Thus power is removed from the run mode load subject to the overvoltage or overcurrent or anomalous condition, and the television receiver assumes a standby condition.

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First Claim