graphic card having issues

[C_Lainz]

I took my xperia z1 to a repair shop, because my screen was having some trouble reading color information and it was blinking too. And they told me that I couldn't do anything because the problem came from the graphic card. So, can I repair this? Or does the guaranty cover this?

[Thommo]

If it's the graphics chip then no you wouldn't be able to repair it yourself as it's a hardware issue so you would need to either return it to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/