海信LED46K310X3D不开机电源板7.820.4688坏维修

打烊，铭早再来！维修案例2022-12-114.1K

拆开发现电源板 RSAG7.820.4688/ROH无电压输出

待机电源8脚双插芯片 TNY175PN炸裂

测量外围元件和保险丝没有损坏

换上芯片还是无待机5Vsb输出

测量发现待机变压器BK-10-05HY\ROH BCK-EFD-1501 有一组绕组开路

到旧板拆个变压器换上

通电5Vsb有电压

短接on/off 16V 正常 PFC380V 正常恒流正常

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海信LED46K310X3D不开机 电源板7.820.4688坏维修