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red picture through projector

post #1 of 2
9/30/09 at 6:46pm
Thread Starter 
ok guys, im stumped. i have a NEC vt460 projector mounted in my livingroom, with outlaw amp and jbl surround sound. when i have any video piped to it the picture is clear as a bell, BEAUTIFUL, but when i hook a laptop to it the picture is abnormally red. this is the second projector that has done this. now before you think its the laptop lemme explain my process of elimination here, 3 different laptops, 3 different cables, one 50 foot, one 25 foot, and one 6 foot, with all 3 laptops, 3 cables, and 2 projectors its the EXACT same thing, i tried adjusting the picture color levels for just that input and after 4 hours of tinkering it still either too red or too blue. i have attempted to contact the NEC tech support to no avail, they refuse to respond to my emails. so now that i have tested everything i can think of (as a HT noob) i hereby hand it off to the professionals in order to help me diagnose this, i have a mini netbook (asus eee 701) that i want to use as my streaming box to the projector so i can watch the ripped dvds i have on my share server (all legit) or watch my netflix on the big screen and i cant with the picture this messed up. please, any help would be greatly appreciated
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post #2 of 2
10/1/09 at 5:58pm
There are two obvious possibilities to look at.

Actually, checking back, seeing that you've tried different cables and computers, no, there's one likely problem.

Chances are, the input that you're using is selectable between RGB or RGBHV, and YUV/Y-Pr-Pb. 

Computers use RGB (or RGBHV, or RGsB, or RGBS (it's all a matter of where the synchronization goes: RGB is ambiguous.  RGsB has the sync with the Green.  RGBS has a 4th wire carrying the sync, and RGBHV has two pieces of coax for sync; horizontal and vertical.  But I digress.)

DVD players tend to use Component video, sometimes called YUV or Y-Pr-Pb, depending on the exact issues.  In either case, while not exactly the same, they're generally referring to a "Luminance," or Y channel, and two color-difference channels, which when processed into the Y signal, yields up the actual color information.

Feed an RGB signal into a YUV decoder, and it's gonna be some version of pink, red, or magenta.

Somewhere, there should be a menu-setting in the projector that'll let you tell the projector what the signal is.  If it's a computer, it's RGB.  If it's a DVD/Blu-Ray player, it'll almost always be YUV, Y-Pr-Pb, or sometimes more ambiguously called "Component".

That should do it for you.

Leo
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