Often, Antminer S2 come with an LCD screen which is very bright and difficult to read because of lack of contrast.
Here is how to adjust the contrast :
First, gently peel off the front "Antminer" label covering the screen :
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FfQKUHqS.jpg&t=663&c=x_UgqCKoypLvCA)
Then you'll notice three tiny holes around it. The hole in lower right position contains a very small pot, which you can adjust using a precision "+" screwdriver :
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FWdDwPmK.jpg&t=663&c=1IqTbMGyR2Y6xg)
And that's it ! You know have the perfect quality picture you've always dreamed of !
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FYW4KgaA.jpg&t=663&c=ekYRNPGrHCUaSw)
All you have to do then is to put back the "antminer" label you gently peeled off at the beginning : it should be still sticky enough.
You can then go back to your regular occupation.
Easy...
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)