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故障现象:开机后水平一条亮线。检修:通电测场输出集成电路N40(1TDA8350Q)④脚(电源电压输入端)电压为19V,⑧脚(回扫电源电压输入端)电压为0(V正常值为45V),关机先将⑧脚悬空,测N401⑧脚对地阻值为零。说明供电脚对地击穿。测供电回路中限流电阻R40(410Ω/0.5W)烧断。拆下N401
Symptom: a bright line after boot. Maintenance: Power-on field output integrated circuit N40 (1TDA8350Q) ④ feet (supply voltage input) voltage is 19V, ⑧ feet (flyback power supply voltage input) voltage is 0 (V normal value is 45V), turn off the first ⑧ pin Dangling, measured N401 ⑧ feet to ground resistance is zero. Describe the breakdown of the power supply pin on the ground. Measure the power supply circuit in the current limiting resistor R40 (410Ω / 0.5W) blown. Remove N401