iphone 4 minor water damage
 

Unfortunately my iphone was placed on a wet bench top and water migrated into the cover and to a lesser degree into the phone.
Dried the phone up as best as I could and then stuck in a bag of rice for a couple of days.
Turned on and not good.
I purchased a pentalobe screwdriver and opened the back up - No water inside and moisture sensors not activated. Removed battery and left in sun to dry out any remaining moisture .
Reassembled and booted up .
Apple logo displays.
Now HELLO
Select language-Done
Select country-Done
ok now connect to itunes
Double click on home button
emergency call and keyborad displays-cancel this
Open itunes
connected to itunes
get error message - THERE IS A PROBLEM WITH YOUR IPHONE
If there is water damage why does the display and keyboard function ?
Next Enter recovery mode -Hold down power button and home button for 10seconds -then release power , and continue holding down home button until reboot.
itunes message - RESTORE IPHONE
Restore and update proceeding
iphone display indicates progress during restoration
iphone restored to factory settings with no issues
iphone detected by itunes
accessing istore
Then MESSAGE - THERE IS A PROBLEM WITH YOU IPHONE.
Come full circle.
My question is - If there is internal damage ,is it likely that the display would work and a complete restore can be achieved ?
I suspect its a software issue .

Stick it in a ziplock bag with some silica gel packs and place in the airing cupboard for a couple of days.

Likely there is still some moisture shorting somewhere.