My LC49HG90DMLXZS is unusable. At power up it shows a black screen and then vertical colored lines (photo attached). The fault manifests itself even with no video input connected to the monitor.
The installed firmware is m-HG949CCAA-1021.0 downloaded from:
Please guide me how to solve my problem
If you try to bring up the on screen menu built into the monitor how does it look?
Indeed, the problem was generated after installing the new firmware.
I can't go back to a previous version because the screen menu built into the monitor is not visible.
I have two identical monitors. I updated the firmware on both and only one has the problem (photo).