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Hi, I dropped my Sony Xperia Z2 and there created a crack on front glass = touch not working.
I must only change lcd and it will working ?
I'm sorry, hard to tell, if the damage was only to the LCD+Digitizer then replacing it should solve the issue.
There are 3 ways on doing so:
1 contact your Local support
2 contact a third party repair shop
or
3 DIY, which will be cheaper, keep in mind that 2 and 3 will void the warranty if any available.
I've repaired an Xperia Z before, check this guide:
https://www.ifixit.com/Device/Sony_Xperia_Z
and you can also buy the spare parts online, amazon, ebay, etc.
Don't forget to buy the double sided adhesive for both front and back
Side note, since you are going to open up the phone, it'll be wise to replace the battery for a new one, which will improve the battery life