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例1故障现象:TCLLCDl526液晶彩电,开机后图像出现约1s后,进入保护状态。分析与检修:从故障现象看,估计是逆变器不良。拆开机器,看到背光高压板C2B处和屏蔽罩有打火发黑的痕迹。在打火处加贴绝缘胶片,开机一切正常。例2故障现象:TCLLCDl526液晶彩电,待机状态红色指示灯亮正常,开机时红色指示灯一直在闪,不能开机。分析与检修:开机,测MCU的CONTR-PW(控制电源开/关)开机控制脚电压变化正常,但IC804(KIA278R08)的②脚无电压输出,测IC804的①脚几乎为0V电压,
Example 1 Symptom: TCLLCDl526 LCD TV, boot image appears about 1s, enter the protected state. Analysis and Maintenance: From the fault phenomenon, it is estimated that the inverter is not good. Open the machine, see the high-voltage backlight at the C2B and the shield has black and white marks. In the ignition office affixed insulation film, boot everything is normal. Example 2 Symptom: TCLLCDl526 LCD TV, the standby light red light is normal, the red light is always flashing boot, can not boot. Analysis and Overhaul: Turn on and measure the CONTR-PW (control power on / off) of the MCU. The voltage of the power-on control pin changes normally, but there is no voltage output of pin ② of IC804 (KIA278R08)