Beijing Sony TV after-sales service telephone, Sony KV-F25MF1 TV, image distortion and shortage at the bottom. Source: Beijing Sony TV Repair Center http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3682079. Fault phenomenon: Image distortion and shortage at the bottom. Analysis and maintenance: Since the data of the geometric shape of the image is stored in the memory, it is necessary to check whether the memory is good or not. Randomly select a TV program and adjust the sound to the maximum, then turn off the main power switch. After turning on the machine again, it was found that the channel number became 1, and the sound also became moderate, so it was judged that the memory was damaged. After replacing the new part and turning on the machine, the image was still abnormal. Use the remote control to enter the circuit repair state, first initialize the data with "5" and "0", the image basically returns to normal, and then make fine adjustments, and finally eliminate the fault. Note: The quality of the memory can be determined by checking whether the original state is maintained before and after shutdown and startup.