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(6)三无,+145V跳压后又返零电压。故障部位:开关电源电路单向晶闸管V819的A-G引脚短路,重新处理;行回扫变压器T402绕组击穿,更换T402。
(6) three no, +145 V back to zero voltage after the voltage jump. Fault location: switching power supply circuit unidirectional thyristor V819 A-G pin short circuit, re-processing; line flyback transformer T402 winding breakdown, replace the T402.