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1.虹美 C5409型彩电,故障现象如图1所示。当接收信号时光栅区图像正常,场扫描区图像被严重拉长,下部线性不良。测量场块 LA7830各脚电压基本正常,原冈是5RP03(100Ω)场幅电位器开路,换之正常。2.画霸 PH08/25C60型彩电,开机“吱吱”一声保护,指示灯一闪即灭,当断开可控硅 V819(SFOR1842)接100 W 灯泡做假负载时,灯亮闪,开关变压器有“吱吱”响,测量负载电压均偏高。换掉 C814(470 μF/50V)电容,一切正常。3.熊猫3636型彩电,图、声正常,彩色不纯,红色为紫色,黄色为白色。测 TA7698有关脚电压基本正常,无意中拆下 T802相位电感,开机时,彩色正常。
1. Hong Mei C5409-type TV, the fault phenomenon shown in Figure 1. The grating area image is normal when the signal is received, the image of the field scanning area is severely elongated, and the lower linearity is poor. The measuring field block LA7830 foot voltage is normal, the original is the 5RP03 (100Ω) field potentiometer open, change the normal. 2. Painting tyrants PH08 / 25C60 color TV, boot “creak” sound protection, flashing light is off, when the disconnect SCR V819 (SFOR1842) then 100 W bulb to do a false load, the light is on, the switching transformer “Creak” ring, measuring the load voltage is high. Replace C814 (470 μF / 50V) capacitor, everything is normal. 3. Panda 3636 color TV, picture, sound normal, color impure, red is purple, yellow is white. Measuring TA7698 voltage on the foot of the normal, inadvertently removed T802 phase inductance, boot, color normal.