Screen goes black when pressure is applied to top-left corner
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I've got an iPhone 3G that I've used on and off for the last 2.5 years. I've decided to try and fix it as at the moment I can't use it as my main phone as it's prone to shutting gong a bit crazy at times.
Anyway, when I apply pressure to the top-left corner of the device the screen goes black. Pressing the power button returns to the lock screen and the phone works as normal, until I apply pressure again. Sometimes, using the volume rocker (usually volume down, but sometimes up) will also make it go black. This is more annoying. Any thoughts on what parts I may need to replace to fix this issue? Here is a link to a video I made of the problem.
The GPS hasn't worked for about 1.5 years, it never gets a lock. The connection 6 may be loose or it might need a new antenna, I'll check it when I install my new battery later this week.
Thanks in advance for any help on either issue!