A few days ago, I repaired a Skyworth 32E380S LCD TV. After the logo appeared, the dark screen after the LOGO, the backlight was dead, and the remote control buttons did not respond. The test machine was still the same.
After preliminary analysis, it should be a software failure. The [Sichuan Integrity LCD Repair] and [Wuhai Yuxiang] Super Edition provide the U disk upgrade program and upgrade method respectively, and give guidance.
U disk upgrade program: link: http://pan.baidu.com/s/1gfQpXL5 Password: 8axk
I use the third method, save the upgrade file to the root directory of the U disk, and then rename the file name to install_keypad.img (note that the file name should be copied, do not enter it manually to avoid errors.) Local upgrade method and The picture shows a little bit of difference, after the boot, you can't see the red light at all. After entering the upgrade program, the indicator light will not flash alternately. Operation method: Immediately after the machine is powered on, press and hold the “Menu†button until the red light starts to flash and then release. After a few seconds, the upgrade screen will appear. The upgrade process takes about one minute. Do not remove the USB flash drive and turn off the TV. Any operation, wait until the upgrade is successful, then turn off the USB flash drive and reboot.
After the upgrade is successful, it can be displayed again. The AV status is normally played back with the DVD input signal, but the TV status is automatically searched for one station. Considering that the user's home is digital TV can also be used for work, put it aside and do other things. Live, and turn it on again at night, the fault remains. , repeated brushing twice invalid. After analysis by the group, there may be hardware failure. Sichuan Chengxin Master once again provided the motherboard drawings. After careful measurement, it was found that the voltage output of the motherboard U19 was abnormal. The output was initially 1V, and later changed to 2V. When the TV was restored to 2V, the TV still returned. Can't find the station. The comparison drawing found that the U19 output voltage is 5V, after looking for a similar LD1117 replacement on the old board, the voltage output is 7.5V, and it is busy to shut down. Since there is no suitable LD1117, it is decided to use the installation of a 7805 to try, the boot is normal after installation, automatic Search can also be found in the station, the original 5V of which is to supply power to the high frequency head, and the fault is completely eliminated.
Skyworth 5800-A8R580-0P30 motherboard drawings: Skyworth 5800-A8R580-0P30.pdf
Special thanks to Sichuan Integrity Master, Wuhai Yuxiang, wangji, Xiaoqiao. Liushui. People, ttfx, several masters provide information and help analyze faults, a fence three piles, people are more powerful.
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