Vertical lines can be a processing issue or a connection issue. Usually, these are due to poor connections between the processing board and the panel. If you feel confident enough, remove the back of the assembly, then remove and reinsert the ribbon cables to access the panel. This will often solve the problem. Be careful as these cables are delicate and can be easily damaged. The connectors should have "locking tabs" which also need to be released to get the cables out. If this reinstallation does not resolve the problem, further investigation is necessary and should be performed by an experienced repair shop.