Is there a way to check if the touch screen and display works whilst iPod is apart?

Question

Hi,
I pulled my iPod Touch 4G apart up to the circuit board in order to pull out the headphone socket.
Before I pulled it apart, the screen was cracked but everything was perfectly visible and the touch function worked perfectly.
Because the screen was cracked, when I pulled the iPod apart, I obviously lost small chunks of the screen.
Now when I plug the two plugs from the LCD screen into the circuit board and put the iPod together without screws, it looks like this:
http://s251.photobucket.com/user/matt9210/media/2013-06-19014523_zps86e6bc6e.jpg .html
So I'm not sure whether buying a new screen is the answer, because I'm worried it will still have the same effect on the new screen.
Another question: The headphone socket wasn't working. I had to hold the earphones in order to get any sound, and knocking them would lose the sound. I checked with other earphones before opening the iPod, so it's a problem with the iPod. What do I do with the headphone socket to avoid this problem?
Also, is this good enough to replace the iPod screen? A lot cheaper than I thought, thought I'd check what the catch is.
http://www.ebay.co.uk/itm/New-LCD-Display-Screen-Digitizer-Assembly-7-Tools-for- iPod-Touch-4G-4th-Gen-UK-/290908549993?pt=UK_Replacement_Parts_Tools&hash=item43 bb803369

Answer 1

Hi,
I pulled my iPod Touch 4G apart up to the circuit board in order to pull out the headphone socket.
Before I pulled it apart, the screen was cracked but everything was perfectly visible and the touch function worked perfectly.
Because the screen was cracked, when I pulled the iPod apart, I obviously lost small chunks of the screen.
Now when I plug the two plugs from the LCD screen into the circuit board and put the iPod together without screws, it looks like this:
http://s251.photobucket.com/user/matt9210/media/2013-06-19014523_zps86e6bc6e.jpg .html
So I'm not sure whether buying a new screen is the answer, because I'm worried it will still have the same effect on the new screen.
Another question: The headphone socket wasn't working. I had to hold the earphones in order to get any sound, and knocking them would lose the sound. I checked with other earphones before opening the iPod, so it's a problem with the iPod. What do I do with the headphone socket to avoid this problem?
Also, is this good enough to replace the iPod screen? A lot cheaper than I thought, thought I'd check what the catch is.
http://www.ebay.co.uk/itm/New-LCD-Display-Screen-Digitizer-Assembly-7-Tools-for- iPod-Touch-4G-4th-Gen-UK-/290908549993?pt=UK_Replacement_Parts_Tools&hash=item43 bb803369