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日电CT-1802PDH(R)彩电和台湾A—MARKD3121彩电电源均采用STR440厚膜块,内电路如图1所示。此块工作时温度较高,损坏后出现无光无声故障。用“手术法”修复此块,使用很好。检测方法:拆下STR440,引脚排列见图2所示,用万用表R×1kΩ档测①②脚电阻,发现正反向电阻很小,说明其内部开关管BG_3击穿。修复方法:将STR440用钢锯沿图2虚线位置锯开顶盖(注意要沿顶盖周围小心锯开,切勿损坏内部元
NEC CT-1802PDH (R) TV and Taiwan A-MARKD3121 color TV power supply are STR440 thick film block, the circuit shown in Figure 1. This piece of work when the temperature is high, there is no sound after the failure of damage. Use the “surgery” to repair this block, it works well. Detection: Remove STR440, pin arrangement shown in Figure 2, with a multimeter R × 1kΩ file test ① ② foot resistance and found that the positive and negative resistance is small, indicating that the internal switch BG_3 breakdown. Repair method: the STR440 with a hacksaw position along the broken line in Figure 2 saw the top cover (be careful to be careful around the top of the cover saw, do not damage the internal element