Kevin Gray <notsome1else@...>
I also use a 7” Touch monitor for y pi, and possibly the case you mentioned.
I had the same “Lightning Bolt” problem you describe.
My Cure – stop using the “Y adapter” that came with the monitor.
The wires are too small to provide the necessary voltage/current needed for the PI.
Once I switched to two separate cables to power things, the “Lightning Bolt” disappeared.
73 Kevin N9VPV