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故障现象:卡西欧TV-450袖珍彩电无光栅、无图象,有伴音。 分析与检修:卡西欧TV-450袖珍彩电,图象采用液晶显示,且大部分采用贴片元件,检修有一定难度。有伴音,说明伴音电路正常,无光栅、无图象,说明液晶显示板电源电路有问题。如图示,液晶显示高压电路由C1、L、R_1、R_2、R_3、T、Q_1、Q_2以及C_2、C_3组成,当直流6伏电源通过R_1、R_2、R_3、T_(1—2)T_(2—3)以及C_3
Symptom: Casio TV-450 Pocket TV no grating, no image, accompanied by sound. Analysis and Overhaul: Casio TV-450 pocket color TV, the image using liquid crystal display, and most of the patch components, overhauling a certain degree of difficulty. A sound, indicating that the sound circuit is normal, no grating, no image, indicating that there is a problem LCD power supply circuit. As shown in the figure, the liquid crystal display high voltage circuit is composed of C1, L, R_1, R_2, R_3, T, Q_1, Q_2 and C_2, C_3. When the DC 6 volt power passes through R_1, R_2, R_3, T_ (1-2) 2-3) and C_3