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Hi @TokHassan2017, welcome to the community.
I am sorry to see you have an issue with your XZs. It looks to be a physical problem. Do you see the line in every app you use?
I would recommend you contact yoru Local support team for assistance with this.
yup.. i see the line when use other then white backround. for example when i using facebook application, i see the line at blue part.
@TokHassan2017, hi, I notice you are using a screen protector. does the line show up when you remove it? have you tried to run xperia diagnostics ? settings>about phone
or boot to safe mode
nolramlb the line show up before im using a screen protector. i run xperia diagnostic and the result all pass. im already do reset to factory, boot to safe mode and done the latest system update but the line still show up.