N1 flash led is blue

[noShame]

My trackball and powerbutton were driving me crazy so I decided to tear down my n1 and clean it up. Everything went well, they both work fine now but in the process i managed to scratch the led flash chip.

turns out, our leds are not white they are blue and there is some sort of filter painted over the chip that make it white. So now I have a blue led that messes up all photos taken with it on

Does anybody know what kind of filter/paint that is on the chip? or where I can get a new replacement part? (tried ebay but there were no led/flash chips for sale)

 

[itay1]

You can't "filter out" white from blue. that's nonsense.

Your LED is broken.

 

[Meltus]

Its more likely that the scratch you made is causing some light refraction which makes it look blue.
As previously stated, you can't filter white from blue.

Sent from my Nexus One using XDA App

 

[OutlawPro]

Unlike pigments, white light is made up of quantities of other wavelengths (colors) of light. So, you can't get white from filtering blue. You can get blue by filtering white. You're probably thinking pigments (paint) where you can get white by filtering out other color pigments from the paint.

 

[noShame]

The led is not broken and its not nonsense. It was partially scratched (the white stuff on the led) so it was shining part blue part white (you could see it clearly if you put it against a white paper, a square part blue part white). So when i removed the rest of the white stuff, which was very easy to do, the whole led now has a deep blue color.

I am not a moron, if you are so sure try removing the white grease from your led and see if it turns blue..

 

[noShame]

Unlike pigments, white light is made up of quantities of other wavelengths (colors) of light. So, you can't get white from filtering blue. You can get blue by filtering white. You're probably thinking pigments (paint) where you can get white by filtering out other color pigments from the paint.

i will post a pic of my led chip so you can compare it with the one from ifix teardown of the n1, youll see the white stuff im talking about. dont know what or how, but it makes the blue led white :\

 

[Rod3]

Not sure if this is of any help, but I had read somewhere that when our flashes experience "burn-in" (over use... such as flashlight) they turn blue.

 

[draugaz]

http://en.wikipedia.org/wiki/Phosphor#White_LEDs

So you seem to have managed to schatch that white light emitting coating.

I am not sure how difficult it is to get hold of those white SMD LED's in small quantities. Maybe from some other otherwise broken device from ebay?

 

[GldRush98]

A frightening number of people have no clue how white LED's work here. Yikes...

OP is 100% accurate. He scratched the coating off his LED that emits the white light, and it is now blue (the original color of the LED).

OP, the only way to repair this is to replace the LED. Sorry man...

 

[itay1]

A frightening number of people have no clue how white LED's work here. Yikes...

OP is 100% accurate. He scratched the coating off his LED that emits the white light, and it is now blue (the original color of the LED).

OP, the only way to repair this is to replace the LED. Sorry man...

OP is 100% wrong.

The coating emits a whole new range of wavelength which produce the white "color" when combined.

You don't get the white color by filtering out the blue - but rather you transfer energy to a different substance, by shining a blue light onto it. that in turn, produces the white light. It's not a filtering process at all.

And the conclusion is also the same, his LED needs replacing.

 

[noShame]

Thanks everybody for your help and thanks draugaz and GldRush98 for clearing that up!

Will look for an replacement led or just live with it (don't use the flash that often anyway).

Cheers all!

 

[tech338]

OP is 100% wrong.

The coating emits a whole new range of wavelength which produce the white "color" when combined.

You don't get the white color by filtering out the blue - but rather you transfer energy to a different substance, by shining a blue light onto it. that in turn, produces the white light. It's not a filtering process at all.

And the conclusion is also the same, his LED needs replacing.

Not to stir the pot, but I don't think the OP is 100% percent wrong. It is a blue LED (that by some method) emits white (or white-ish) light. Maybe he didn't understand the method.

BTW, if it is not a filter, what do they call the process of "transfer[ing] [light ]energy to a different substance" to change the visible spectrum of light from one color to another? What is the correct technical term?

 

[pfmiller]

Not to stir the pot, but I don't think the OP is 100% percent wrong. It is a blue LED (that by some method) emits white (or white-ish) light. Maybe he didn't understand the method.

BTW, if it is not a filter, what do they call the process of "transfer[ing] [light ]energy to a different substance" to change the visible spectrum of light from one color to another? What is the correct technical term?

Scintillation is the technical term for what is going on in the LED's coating.

A frightening number of people have no clue how white LED's work here. Yikes...

That frightens you? Really? I didn't know that a strong background in semiconductors and quantum physics was a requirement for posting here.

 

[crawler9]

A frightening number of people here are geeks. Yikes, I should stop lurking in this place for a while.

Haha, that made me laugh.

Was nice to learn a little something about LED's in this thread.