A number of reports from indicate that purchasers of the new PSP-3000 model are less than impressed by the horizontal scan lines now visible in games played on the supposedly enhanced screen.

The new console has sold over 140,000 units within four days of going on sale, but some players have noted with dissatisfaction the scan lines now visible on the revised handheld. What's more, won't be doing anything about it.

"On some occasions, scan lines may appear on scenes where brightness changes drastically, due to the features of the new LCD device on PSP-3000," read a statement from Sony (thanks Joystiq).

"Installed with this new LCD device, PSP-3000 offers more natural and vibrant colours on its screen, but the scan lines have come out to be more visible as a result of improving response time to alleviate the afterimages on PSP-3000.

"Since this is due to hardware specification, there are no plans for a system software update concerning this issue."

The new handheld will be released in and the soon.

By Luke Guttridge