Touchscreen chip flaw renders some iPhone 6 and 6 Plus devices useless

Scores of users complain of broken or unresponsive screens, which repair specialists report is down to a widespread flaw in touchscreen chips

Apple's iPhone 6 and 6 Plus appear to be vulnerable to so-called "touch disease", a hardware problem that is crippling phones, according to reports from users and third-party repairers.

The issue, which has been observed in iPhone 6s since the beginning of the year, seems to affect the touchscreen controller chips, resulting in problems for the high-end smartphones in responding to touch input.