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当我们测量V431集电极工作电压在20V到24V之间时,说明行振荡级、行推动级工作正常,故障是由于V431集电极负载变轻所致。应该检查T402次级、L404以及行输出管V432是否开路等。如果行115V供电电压较低,我们怀疑可能是行扫描电路短路引起时,可以断开行输出级,用100W灯泡作假负载,?
When we measure the working voltage V431 collector between 20V to 24V, the line shows the level of oscillation, the line to promote the level of work is normal, the fault is due to V431 collector load becomes lighter. T402 secondary should be checked, L404 and line output tube V432 is open and so on. If the line 115V supply voltage is low, we suspect the line scan circuit may be caused by a short circuit, you can disconnect the line output stage, with a 100W bulb as a dummy load ,?