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Strange lines on lightroom when viewed using an external monitor


Jul 15, 2009
Lightroom Version
Operating System
Windows 10
I have lightroom 5.x installed on a windows 10 laptop. When I view it on an external monitor, connected via mini hdmi (LG 29" LG 29UM59-P | 29 Inch LCD Monitor | LG HK), I get these weird white drop shadows everywhere. See the attached image, which shows the white lines on the develop module. This doesn't happen if I view lightroom on my laptop screen. This problem didn't happen with my older windows 8 laptop on the same monitor. No other application exhibit this behaviour. For example, I tried photoshop/premiere and everything looks fine on the same monitor. Does anyone what could be the problem/causing it?


May 12, 2011
Lightroom Experience
Lightroom Version
That's a cool monitor. It does, however, seem to potentially do a lot of processing internally. Can you do a "factory reset" on the monitor? That would be the first thing I'd try.

Does it require a special driver? If so, maybe you need to go to LG and get a copy of the latest one.