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故障现象:先是屏幕上方有若干条回扫线,几天后场幅压缩并下方有卷边。检修过程:测场输出集成块TDA3653各脚电压,除⑧脚为“零”外,其余正常。怀疑集成块损坏,换一新品,试机故障依旧。再次拆下集成块,检测后证实又被损坏。认真检查集成块外围电路,发现C617(100μF/50V)电解电容漏电,这是两次损坏集成块的原因所在。换一电解电容和集成块,试机正常。
Symptom: First, there are a number of top of the screen flyback line, a few days after the field compression and curling below. Maintenance process: the output of the test block TDA3653 integrated voltage feet, except ⑧ feet as “zero”, the rest of normal. Suspected block damage, for a new product, test machine fault still. Once again remove the manifold, after testing proved damaged. Carefully check the integrated circuit peripheral circuits, found C617 (100μF / 50V) electrolytic capacitor leakage, which is twice the cause of damage to the manifold. Change an electrolytic capacitor and manifold, test machine normal.