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故障现象:一台创维8000T—2189G(4T01机心)彩电,“二次开机”后无光、无声,有字符故障,将菜单中蓝屏设为“关”后,有声、无光,从AV端输入信号也如此。后将加速极电压G2调高发现TV状态为蓝屏(特暗),而此时再从AV端送入信号AV后,无论TV、AV1、AV2 S—VIDEO状态下均为暗淡黑白图像,将彩色调至100最大,有一点彩色。分析与检修:由于AV信号输入后,TV状态也有图像,所以首先更换视频切换块IC202/TA1275(实际用4052),无效,测IC201/TB1238N(43)脚(TV信号输入端)为1.65 V(正常应为3.1 V),IC201(41)脚(外部视频
Symptoms: a Skyworth 8000T-2189G (4T01 movement) color TV, “after the boot ” no light, no sound, a character failure, the menu blue screen is set to “off ”, the sound, no light , From the AV input signal as well. After the acceleration voltage G2 is increased to find the TV status is blue (dark), and then from the AV terminal into the signal AV, regardless of TV, AV1, AV2 S-VIDEO state are dark black and white images, the color Tune to 100 the largest, a little color. Analysis and Overhaul: Since the TV state has an image even after the AV signal is input, the video switching block IC202 / TA1275 (actually 4052) is replaced first and is invalid. The IC201 / TB1238N (43) Normal should be 3.1 V), IC201 (41) feet (external video