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③对Q30l、Q302组成的场异常检测电路进行检查,发现电容器C309(100μF/16V)已无容量。该电容器为保护延迟电路,开机后场输出电路工作前的瞬间,C309充电为Q302提供正向偏置电流,延续到场输出电路进入工作状态,避免开机时误保护。此故障由于C309无容量,失去了延迟作用,引起开机即进入保护状态。更换C309后,恢复保护电路,电视机不再发生保护故障。
③ Q30l, Q302 field anomaly detection circuit consisting of inspection and found that the capacitor C309 (100μF / 16V) has no capacity. The capacitor is to protect the delay circuit, boot the field output circuit immediately after the work of the moment, C309 charge Q302 to provide forward bias current, extended to the field output circuit into the working state, to avoid false boot protection. This failure due to C309 no capacity, lost the role of delay, causing the boot into the protection state. Replacement C309, restore the protection circuit, the TV will no longer occur protection fault.