Hello,
the screen of your phone is defective. It needs to be replaced.
Also, there is every possibility that the screen is not well attached the the phone board. It may have loosed contact or the flex may be damaged.
Have the phone disassembled, get the screen, make sure it is firmly positioned to the right place. if screen is still blue after this, then it means you need a screen replacement.
I hope the above is clear. Please let me know if you need more help....
Good luck.
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