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Mod the lighting on GTX780???

Joegy

Joegy

Joegy

Associate
Joined
6 Jan 2011
Posts
52
Has anyone ever though about replacing the green lettering on the gtx780 that lights up with another colour?

I am looking to build a black/white themed build based around my 780 (stock cooler) and would love it if the GTX Geforce 780 bit glowed in white instead of green....

How hard do you think it would be?
Also, does anyone know of someone doing it already?
 
zotac-gtx-780_light.jpg


This changed to white...
 
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is it a white led with a green plastic filter?

or is it a green led with a frosted clear filter?

once we work it out, then we can come up with a plan of action :)
 
panyan said:
is it a white led with a green plastic filter?

or is it a green led with a frosted clear filter?

once we work it out, then we can come up with a plan of action :)
Click to expand...

I cant tell underneath the lettering, but the lettering itself is bright green, so Id assume white LEDs underneath. But the lettering is shaped and made of rubber i think, so finding a white replacement would be a pain.

Any ideas? :D
 
Joegy said:
Has anyone ever though about replacing the green lettering on the gtx780 that lights up with another colour?

I am looking to build a black/white themed build based around my 780 (stock cooler) and would love it if the GTX Geforce 780 bit glowed in white instead of green....

How hard do you think it would be?
Also, does anyone know of someone doing it already?
Click to expand...

I thought Nv was going to give people a program so we could change the colour? I pretty sure I read that somewhere?
 
Evga have the titan led controller software, afaik you can't change colour but you can set the led to pulse or adjust with game activity.
 
pgi947 said:
Evga have the titan led controller software, afaik you can't change colour but you can set the led to pulse or adjust with game activity.
Click to expand...

Yeah, but its still green :S

I wonder if I painted the letters with red paint (see through/stainglass paint?)

if that would work...
 
Take the cooler off and have a look, if it is a white led underneath then the odds are the green bit is a single strip of acrylic which shouldn't be too hard to change.
 
They will be yellow-green LEDs (~575nm), as they are MUCH cheaper than white LEDs and with LED there's no point shining white light through a colour filter - totally inefficient and unnecessary.

Yellow-green LEDs will run at ~2-2.2V or so, where a typical white LED will need ~3-3.5V, so you'd need to know how much voltage the LED driver circuit is capable of delivering to the LED. The pulsing / flashing / glowing function will be implemented by adjusting the driver current to the LED.

Red/orange/amber/yellow & yellow-green LEDs all run at around the 2V mark, where true-green (~525nm), blue and white LEDs (white is a blue LED with a phosphor conversion layer) require typically 3-3.5V.

I expect the logo is edge-lit by one or two side-emitting LEDs, which, depending on package type, you may find difficult to hand-solder.

/edit Just watched a video of removing the cooler from a Titan, and there are two power connectors running from the PCB to the cooler. I suspect one is for the fan power and the other will be for the LED logo, which suggests that the LED driver circuit is probably integrated on the main PCB. This probably means that it's being powered from a 3V or 3.3V supply, which is good news if you want to swap the LEDs from yellow-green to white.
 
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Joegy said:
Yeah, but its still green :S

I wonder if I painted the letters with red paint (see through/stainglass paint?)

if that would work...
Click to expand...

No - sorry. Say that the source is a white LED, and it's been filtered through a green filter, then there is physically no way to reconstitute a white light.


Say you start with a full spectrum white LED then pass it through a green filter. The green filter removes all "non-green" light; that is, any wavelengths that are outside a certain range are absorbed into the filter, leaving only the 'green' light.

If you then try to pass this green light through a red filter, which absorbs any non-red light, you will have virtually nothing left. The only light that will get through is in the overlap region between the red and the green filter (which will be only a tiny amount, depending on how strict the filters are).

... in short, you would be left with a very dull orange glow. You can never reconstitute white light because some of the frequencies required for 'white' have been absorbed by the filters.





edit: Havana_UK points out above that they are unlikely to be white LEDs. The same principle applies though; you need the full spectrum of light to get "white", and you simply do not have that from a yellow-green LED. Adding filters will only further restrict the range of wavelengths that you can see.
 
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If you're still interested in changing the colour, then you're in luck.

It's a white EL panel with painted green gel, so you can just sand off the green paint and reveal the white light underneath.

Here is a YouTube walkthrough:

https://www.youtube.com/watch?v=HyDxXhkh7EY


The guy recommends 400 grit sandpaper.

Here is also a write-up and full thread from the guy on overclock.net:

http://www.overclock.net/t/1431233/geforce-gtx-logo-colour-change-on-titan


I shall be doing this to my Titan very soon!
 
Looks good can see in the thread someone changed it to red. Also the question was asked about warranty and it seems this will void your warranty.
 
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