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Sharp XV-310P LCD projector no sound, but the image of normal fault repair method

Time£º2014-01-27 09:00:35  Source£ºNetwork  Author£ºUnknown  Clicks£º1249

 Image normal, indicating that the switching power supply, IC2001 work properly, you should focus on examination 12V power supply circuit. S3 winding measured rectified by D709, C720 filtered voltage is 13V normal; resistance in normal road test R735; measured Q703 c voltage is 0V, the normal value should be 12V. Remove the Q703 detected no abnormal test Q704 b normal voltage is 12V (the voltage provided by the S5 winding), the Q704 remove the testing, found its c, e pole has been the breakdown. Replacing Q704, troubleshooting.BSHservice manual download site