I have a strange problem which has just appeared in the last couple of days.
I am getting some cyan coloured vertical lines which appear in areas that are in a tonal range of mid-grey (so it appears).
Since I;ve never encountered this phenomena and can't find anything on the net about it I am hoping someone can tell me what might be causeing it.
Some information first:
1) The lines only appear on grey areas which are roughly mid-grey. eg. If I were to adjust gamma whilst lookng at a grey area the lines would move accordingly as the mid grey moves around.
2) I have connected to an external lcd screen and the problem isn't present.
Although this would appear to eliminate the graphic card , I am still unsure as the external circuit might be different to the internal one.
3) The lines are always vertical with gaps in between them and always a cyan colour (see photos)
4) Turning the laptop on / off does not cure the problem. It appears to be here to stay.
- see on the apple laptop the 's' shape
- a closeup of the above showing the defined vertical lines with gaps in between
- another example
- a closeup of above.
- just to illustrate a point, I've twiddled the gamma to make a whole area hit this mid grey and virtually cover the whole screen. Note that a slight change in the shade as in the outer areas of the page clear the problem completely!
There seems to be a sudden inability to cope with a particular grey on any part of the screen. For the most part under normal conditions it doesn't show too much but can be annoying when a grey bar hits the 'sweet spot' eg in the last example or when watching a video when the grey affected areas will be changing around contrast bands.
Can anyone tell shed any light on what this problem might be? I could get a new screen but if it's something else that could be a total waste of money. I'd also be interested in the technical reason for this as it's not something that I'd expect to happen when either graphics or screen go wrong.