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彩电开关电源中所使用的厚膜块IX0689CE损坏,会导致“三无”故障。若其局部损坏,而更换一只价格高的厚膜块IX0689CE,实在太不经济。笔者介绍以下两种情况的局部损坏,可通过更改IX0689CE外围电路来作应急修理。 1.若IX0689CE第⑦、⑧、⑨脚之间被击穿短路,但其他脚均正常,可作如下应急修理:找一只3DG_(12)或C_(2120)型中功率三极管,将b、e、c极分别接IX0689CE第⑦、⑧、⑨脚;再在IX0689CE第⑧、⑨脚之间接一只
IX0689CE thick film used in the color TV switching power supply is damaged, will lead to “three no” fault. If its partial damage, and replace a high price of thick film IX0689CE, it is too uneconomical. The author describes the following two cases of local damage, by changing the IX0689CE peripheral circuits for emergency repair. 1. If the IX0689CE ⑦, ⑧, ⑨ pin breakdown between the short circuit, but the other feet are normal, can be used for emergency repair as follows: Find a 3DG_ (12) or C_ (2120) type power transistor, the b, e, c pole respectively, then IX0689CE the first ⑦, ⑧, ⑨ feet; then IX0689CE the first ⑧, ⑨ pin one