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笔者修复华XT—5653T型彩电时,用户地处农村,由于雷响一时未拨电源插头和有线电视闭路插头,而造成电视机“三无”。几番周折把电源修好后,图像正常,但无伴音,各项操作功能亦正常。用耳朵贴近喇叭,有很小的伴音,判断静噪电路、CPU等可能有问题。因为雷击坏CPU的可能性较大,先查CPU(M3400N4—012SP)的(10)脚(音量控制脚)手按遥控器的“增/减”音量控制键,此脚应有电压4.2V的变化,但实测只有2.6V,无变化。
I repair XT-5653T color TV, the user is located in rural areas, due to thunderstruck moment did not dial the power plug and cable closed-circuit plug, which caused the TV “three no.” After several twists and turns to repair the power supply, the image is normal, but no sound, the operation function is also normal. Close to the speaker with your ears, a small sound, to determine the squelch circuit, CPU, etc. may be a problem. Because of the possibility of lightning damage to the CPU, check the CPU (M3400N4-012SP) (10) feet (volume control pin) hand press the remote control “increase / decrease” volume control key, this pin should have a voltage of 4.2V Change, but the measured only 2.6V, no change.