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一、熊猫DB35H1—5Q型电视机故障现象:光栅左暗右亮。有信号时,伴音基本正常。左侧1/4能看到图像,右3/4一片空白,且从左到右光栅亮度渐增,最右边光亮刺眼,亮度失控。分析检修:开机,查电源12V正常。怀疑束流过大或显像管内碰极。实测整机电流为900mA,说明束流正常。故查显像管外围电路。测得①⑤脚电压,由16V很快降至6.7V而稳定不动,表明该脚电压偏高(正常应零或负电位);②脚23V,偏低(正常为60～80V);③
First, the panda DB35H1-5Q type TV Fault phenomenon: light left and right grating light. A signal, the sound basic normal. The left 1/4 can see the image, the right 3/4 blank, and from left to right raster brightness gradually increased, the most right bright glare, the brightness out of control. Analysis and maintenance: boot, check the power supply 12V normal. Suspected beam is too large or tube inside the tube. The measured machine current is 900mA, indicating normal beam. So check the CRT peripheral circuits. Measured ① ⑤ pin voltage, from 16V to 6.7V and quickly stabilized and does not move, indicating that the foot voltage is high (normal should be zero or negative potential); ② feet 23V, low (normal 60 ~ 80V); ③