一台21英寸杂牌液晶彩电有声音、无图像。拆机发现开机后背光灯一闪即灭.给背光灯板接口ON/OFF端加+5V电压强制启动,仍是一闪即灭。背光板是四灯小口,用四只11W台灯灯管接在背光板上代替原机灯管。通电后灯管发光不再熄灭,表明问题在原机背光灯管。但是换灯管操作难度大,且灯管不易找.维修陷入困境。
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