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We changed a glass digitiser for an S5. Few weeks later customer contacts us and says there are lines on the display and it goes spotty when the phone heats up. I’ve explained this could’ve been from the LCD which is getting progressively worse from the break and not necessarily a Warranty issue. He says it was working fine before we fixed it. I say it was working after we fixed it and for a few weeks after, so anything could’ve happened. Any advice on this would be appreciated thanks

If you didn’t note any issues with LCD before the repair and there is nothing to indicate that the phone has subsequently damaged in any way by the user then considering the fact that the LCD could well be damaged when replacing the digitiser you should probably honour it as a warranty. Assuming it is still within the warranty period of course. If you were concern about the condition of the LCD or couldn’t verify its functionality prior to the repair then you would need to inform the customer that it would not be covered under any warranty provided with the repair.