24" imac backlights horizontal or vertical?

[rpeters83]

Are they mounted vertically or horizontally? I'm curious to see which is the case in regards to the infamous gradient. Thanks.

 

[Leon Kowalski]

Are they mounted vertically or horizontally? I'm curious to see which is the case in regards to the infamous gradient. Thanks.

Almost certainly horizontal. I've never seen a widescreen panel
with anything else. Vertical mounting would require more tubes,
more connectors and more high voltage AC driver channels from
the inverter. That's a big cost penalty for no benefit.

LK

 

[rpeters83]

Almost certainly horizontal. I've never seen a widescreen panel
with anything else. Vertical mounting would require more tubes,
more connectors and more high voltage AC driver channels from
the inverter. That's a big cost penalty for no benefit.

LK

Thanks. So you think this could be the cause of that gradient?

 

[Leon Kowalski]

Thanks. So you think this could be the cause of that gradient?

The only way that horizontally mounted CCFL tubes could cause a left-to-right
brightness gradient would be for the tubes to have uneven brightness along
their lengths. In the case of the gradients frequently reported for 24" iMacs,
most/all of the tubes would have to have matching axial non-uniformities.

There is one known mechanism that might explain this seemingly unlikely
phenomenon. It's the most plausible explanation I've seen, but it still falls
into the realm of pure speculation:

http://discussions.apple.com/thread.jspa?messageID=5400370&#5400370


...who knows what evil lurks in the minds of Cupertino?

LK