【摘 要】
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例1故障现象:海信TLMl519液晶彩电,跑台。分析与检修:液晶彩电高频和中频处理电路同CRT电视完全一致,跑台故障一般与高频、中频电路相关。由于高频头部分电路元器件为易损元
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例1故障现象:海信TLMl519液晶彩电,跑台。分析与检修:液晶彩电高频和中频处理电路同CRT电视完全一致,跑台故障一般与高频、中频电路相关。由于高频头部分电路元器件为易损元器件,先测量高频头关键脚电压,SDA、SCL、VCC、VT等均正常怀疑高频头内部元器件不良。更换高频头,故障排除例2故障现象:海信TLM2077液晶彩电,屏幕显示干扰竖线。分析与检修:通电试机观察,显示屏显示3条干扰竖线,影响图像的显示效果,但图像和伴音都正常用手按压显示屏时,竖线随即消失:当把按压的手松开
Example 1 Symptom: Hisense TLMl519 LCD TV, treadmill. Analysis and Maintenance: LCD color TV high frequency and IF processing circuit with the CRT TV exactly the same, treadmill failure and high frequency, IF circuit. As part of the first part of the high-frequency circuit for the vulnerable components, the first measurement of the key high-frequency voltage head, SDA, SCL, VCC, VT, etc. are normal suspected high-frequency head internal components bad. Replacement tuner, troubleshooting Example 2 Symptom: Hisense TLM2077 LCD TV, the screen displays the interference vertical line. Analysis and Maintenance: Power test machine observation, the display shows three interference vertical lines, affecting the image display, but the image and sound are normal when the screen is pressed by hand, the vertical line disappears immediately: When the release of the hand pressed
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