Hey bud, There are many test points on an iPhone motherboard and all test different parts of the board. I use them to test correct voltages or to repair damaged tracks/lines by running jumpers to them.

Hey Christina, is this something that has started recently? It could be many things. Network problems Signals coming in from multiple systems Long distance calls The other person on speaker or hands free kit And many more. You could rule a few of these out by trying your sim in another phone immediately after experiencing the issue.

Hey bud, it sounds to me like a defective lcd. Did you eye it up against the old one to ensure it is an exact match? The only other thing is the flex cables, do they clip in to fpc connectors or do the push in and flip a clip over them? (I have worked on many tablets but not your model unfortunately) if it is a push in and clip over, make sure it is pushed in all the way, there is normally a white line as a guide so you know how far it goes in. And always make sure the battery is disconnected else you could cause more damage.

Hey Gail, Have you tried holding the power button for 90 seconds? If this doesn’t work, it will probably require a new battery. The battery can be brought from eBay and YouTube can show you how to change it.

Hey bud, have you tried HPs website? They seem to have a lot of information about their devices. Or was it more of a schematic you were after? Is something wrong with your device?

Hey bud, maybe the drives are formatted differently? Do you know what format they both are?

Hey, If you need to add contacts: From home screen select “applications”, Tap contacts, select add contact from the bottom left icon, enter details and click done. If the phone won’t let you, then try this: Go to Settings>Apps, tap Menu>Show System, select Contacts, then Permissions, and make sure all permissions are turned on.

Hey bud, I agree with jayeff, it would be helpful to know what is the pc doing when you plug in your phone? Problems could be anything without more information like, are the correct drivers installed? How is your phone set up to handle a usb being plugged in? Is it set to media transfer, charge only, debugging? Again, as jayeff states, it could be the cable.

Hey bud, yes the screen protectors are the same size.

Hey bud, I agree with Tim, if it is not dimmer switch (should be located next to side light switch/knob) then check fuses.