Haier color TV D29F9A-AKM flower screen fault repair example: As shown in the fault photo, visual power supply filter electrolysis has no bulging phenomenon, obviously the failure of the digital board, gently twisting the digital board does not improve the phenomenon, eliminating the possibility of virtual welding. Ningbo Autrends International Trade Co.,Ltd. , https://www.supervapebar.com
According to experience, it should be the digital board image processing power supply problem. There is a digital meter to directly measure the power supply of each voltage regulator block. It is found that the voltage of the 1.8V voltage regulator block is abnormal, which is 1.7V, and the AC component is 19 millivolts, indicating that the filter is poorly electrolyzed. The AC component of the normal DC voltage should not exceed one percent of the DC voltage, and 100 microfarads are electrolyzed for troubleshooting. At the time of retesting, the AC component is only 4,2 millivolts, which is normal.