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一台东鼎 TD—830B 型 DVD 机,有伴音无图像。该机视频信号处理集成电路 U7采用 AV3169,如图1所示。检修时测量 U7(31)脚亮度信号输出端和(33)脚色度信号输出端及(35)脚复合视频信号输出端电压分别为0.9V、1.2V、1.0V。初步怀疑集成块内部复合视频信号处理电路损坏。于是焊下电感 L8,用一只0.1μF电容把 L9处的色度信号与 L10处的亮度信号混合,组成复合视频信号输出。电视机荧光屏上有黑白图像出现,怀疑碟机的制式与电视机的制式不同。进入“菜单”进行“制式”设置,当两者制式相同后,还是黑白图像。
A Dongding TD-830B DVD machine, sound with no images. The machine video signal processing integrated circuit U7 using AV3169, shown in Figure 1. Overhaul the measurement U7 (31) foot brightness signal output and (33) foot color signal output and (35) foot composite video signal output voltage were 0.9V, 1.2V, 1.0V. Preliminary suspicion of composite block internal composite video signal processing circuit is damaged. Then the welding inductance L8, with a 0.1μF capacitor to the L9 L9 at the chrominance signal and the brightness of the signal mixing, composed of composite video signal output. There are black and white images on the screen of a TV set, and the standard format of the disc player is different from that of the TV set. Into the “menu ” for “format ” settings, when both the same format, or black and white images.