Reset all settings

Choose General > Reset and tap Reset All Settings.

All your preferences and settings are reset. Information, such as your contacts and calendars, and media, such as your songs and videos, are not deleted.

Erase all content and settings

Choose General > Reset and tap “Erase All Content and Settings.”

All your information and media are deleted. You must sync iPhone with your computer to restore contacts, songs, videos, and other information and media.

Reset the keyboard dictionary

Choose General > Reset and tap Reset Keyboard Dictionary.

You add words to the keyboard dictionary by rejecting words iPhone suggests as you type. Tap a word to reject the correction and add the word to the keyboard dictionary. Resetting the keyboard dictionary erases all words you’ve added.

Reset Network Settings

Choose General > Reset and tap Reset Network Settings.

Let me know what the results were.

That's usually a logic board problem, which unfortunately, is very difficult and expensive to replace, often not worthwhile. You may want to try replacing the display, but I doubt it would help you.

I tried everything even changed LCD. did not help. it is not the cable problem. i restore the iPhone using the itune, but i did not reset this way. i will try tonight. i have heared that it would needs a full front replacement.