夏普系列彩电电源故障速除5例

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[例1]夏普25N42-E2彩电故障现象:接通电源后,电源指示灯D1101亮(红色),按面板上“二次开机”键S1101,工作状态指示灯D1102瞬间发出红光,随即熄灭。同时,机内继电器发出“嘀一嗒”两声响。判断检修:根据“二次”开机瞬间指示灯及继电器的动作情况,判断此故障应为主电源不工作。“二次”开机后,D1102红光转瞬即熄,说明CPU已发出开机指令,Q1002在瞬间截止后,重又进入导通状态:继电器发出 [Example 1] Sharp 25N42-E2 Color TV Fault phenomenon: Turn on the power, the power indicator light D1101 is bright (red), press the “secondary boot ” button on the panel S1101, working status indicator light D1102 instantly red, then Extinguished At the same time, the machine relay issued a “tick” sound. Judgments overhaul: According to “second ” boot instantaneous light and relay action, determine the failure should be the main power does not work. “Second ” after boot, D1102 red immediately turn out, indicating CPU has issued a power-on command, Q1002 in an instant after the deadline, re-enter the conduction state: the relay issue
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