Hallo Florian,
 

> The one with an output pin always on high, right?

No. If it was a data line issue, the whole screen would be affected.
Just a column means an address line is affected. in this case I would
say A4. And only the upper half of the screen, that means the error it
is restricted to one pair of 2114's ie. it isn't one of the
buffers/drivers connected to the 2114's. 
Although it may look like garbage, it should be possible to find out
whether bit 0..3 or 4..7 are affected.


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