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故障现象:该机屏幕上有较淡彩色的图像,不断闪烁,其彩色分为上、下两部分。上部约占屏幕的1/3的彩色带微紫色;其余下部的彩色带微蓝色。图像、伴音正常。收看黑白图像时,上部带微绿色,下部带微红色。用户称:“该机曾送一家维修店修过。但送去了一个半月,没有修好。”分析与检修:经仔细观察,发现上部彩色失真较大,下部较小。该机图像、伴音正常,说明通道基本正常。但彩色解码、视频及识别等电路工作不正常。该机采用TDA8305、TDA4555、TDA3504等集成电路,属欧洲线路的TDA机芯,与TCL王牌的TDA机芯相同。因
Symptom: The machine has a lighter color screen image, constantly flashing, the color is divided into upper and lower two parts. The upper part of the screen about 1/3 of the color band with a slight purple; the rest of the lower part of the color with a slight blue. Image, sound normal. When watching black and white images, the top with a light green, the bottom with reddish. The user said: “The machine was sent to a repair shop repaired, but sent for a month and a half, not repaired.” Analysis and Maintenance: After careful observation, found that the upper part of the larger color distortion, the lower part of the smaller. Machine images, sound normal, indicating that the basic normal channel. However, color decoding, video and identification circuits work abnormally. The aircraft uses TDA8305, TDA4555, TDA3504 and other integrated circuits, is a European line of TDA movement, and TCL Trump TDA movement the same. because