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I have the problem of yellow spots with the Xperia S screen, what can I do? I bougth it by eBay...
contact the seller, I don't know the conditions of the purchase but you might be able to return it, and/or you could send it to Sony Repair Center. is the seller in your same country?
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I suggest that you contact your local support team for more info and help with this.
http://www.sonymobile.com/global-en/support/contact-us/contact-info/