Hello.
I was given a HP Z30i LCD computer monitor that had several white wide vertical bands on it. I had another Z30i that was working and after a lot of swapping of components I found that the logic board, TCON board and associated ribbon cables were healthy. The problem was the ribbon cables that go from a long slender PCB across the top of the panel onto the panel itself. The problem connection was on the PCB side not the glass panel side. These ribbon cables are attached with some kind of heat set adhesive.
I'm aware that this type of problem usually isn't repairable...
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