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例49 TCL LCD2726H液晶彩电,图像上半部时而出现绿色竖彩条。分析与检修:根据以往的维修经验,此现象大多由数字电路出现故障引起,首先代换了数字板,试机故障依旧,然后代换模拟板后,故障排除,最后对模拟板进行了维修,在故障出现时,测得JP3接口的Y、U、V输出信号波形异常,再测输入波形正常。更换IC202(TDA9178)后,一切正常。例50 TCL LCD32A71—P液晶彩电,图像忽明忽暗。分析与检修:拆机发现背光灯亮度有明暗闪烁的
Example 49 TCL LCD2726H LCD TV, the image appears sometimes the top half of green vertical color bar. Analysis and Maintenance: According to the previous maintenance experience, this phenomenon is mostly caused by digital circuit failure, the first substitution of the digital board, the test machine failure remains the same, and then replace the analog board, troubleshooting, and finally the analog board was repaired, In the event of a fault, measured JP3 interface Y, U, V output signal waveform anomalies, and then test the input waveform is normal. After replacing IC202 (TDA9178), everything is normal. Example 50 TCL LCD32A71-P LCD TV, flickering images. Analysis and maintenance: disassemble the backlight brightness brightness flashing