Article Source: Beijing Haier Washing Machine Repair Phone Number http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3427273.
Fault Inspection: Connect a 100F electrolytic capacitor between the base and ground of the adjusting tube BG11, then remove the electrolytic capacitor C7 with a soldering iron and replace it with a 3000F electrolytic capacitor. This mainly enhances the power supply filtering. After the above treatment, the machine was tested upon startup, and the washing machine returned to normal, eliminating the fault.
Fault Analysis: Based on this situation, it can be judged that the performance of the microprocessor 14021WFW may be unstable, varying with the operating temperature, or the system may be interfered with. Due to the chaotic display, it can be determined that this interference is related to the power supply. Since the DC voltage ripple is large, it easily affects the operation of various parts in the circuit. Therefore, the first consideration is to enhance the power supply filtering, Haier washing machine repair.
For Haier washing machines, when the power is turned on, the display is normal. However, after a while, it shows arbitrary displays, and when the washing motor is started, the motor keeps rotating continuously.