1. First check if the handle wire is connected properly. If the wire is connected, it can be reconnected.
2. Connect the handle wire directly to the liquid display block to see if it is normal. If it is normal, the intermediate transfer cable can be replaced.
3. Open the control cabinet to check if the interface board is loose. If the interface board is loose, insert it tightly.
4, the liquid display block is broken, you can change it
