If you notice any issues with your LG G3, pinpointing the culprit can be an arduous task. It could be a hardware issue, a resource-heavy app, or a bloatware-infested operating system. Regardless, you'll want to know where the issue lies so you can better troubleshoot the problem. And if you need to take your device back to a retailer, knowing the problem for yourself will ensure you don't get screwed by someone who assumes to know more than you. With a useful, built-in feature on the G3, you can easily run a diagnostic test to ensure things like your LED backlight and camera are functioning properly. All you need to do is enter a code that will unlock the G3's "Hidden Menu", allowing you to cross items off your troubleshooting list. Warning : This procedure is not for the faint-of-heart. As evidenced in the comments below, entering this test menu can lead to different results on different carrier variants. If you have any issues, please leave us a co...
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