Hey Guys,
sorry for my dumb Question, but where do i solder the Anode (+) from the LED? Which is it, the top or the bottom hole?
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the diagram is right next to the led. like on the board on both sides.
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Anode is the top. The resistor to replace, if necessary, is at the top left of the board (1k ohm).
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I have been told the zenith diode (not resistor) will not allow it to burn out any led. so you don't need to add any resistance even for SMT LEDs
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Louisiana
What I do is look at the led closely at the two points inside the glass one will look like a little triangle flag just take note of which side that is and put the replacement in the same way. Also I change the led in all my gameboys with green or amber and sometimes purple and I've never had to change the diode ever or resister. I believe it can stand any led. I haven't tried a black light yet but I'm betting it'll work fine also. But yea easy to do just slap the bitch in there an you're done. I would suggest though to use a desolderer to pull the solder off the points cleanly. Its kind of a bitch to heat the solder up on the points back and forth. You can burn the board and if you're not careful when you pull led out a piece of the board may come with it and then you'll be screwed.
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Thanks Guys.
After the picture of 12ianma and googling the word "led diagram" i got it 
But another question about LEDs. I have to open the Boy again to replace a lose contact and have one white LED left. I would like to add it to the case, but which Power Source can be used for additional LEDs?
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Just use the power from the power led. wire in parallel and you will be fine. it has enough current for quite a few LEDs as they draw so little current. Also two modern LEDs take about the same current as an old one (pretty sure)
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Cool, thanks, so that would mean i also don't need a second resistor for it
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Louisiana
Post some pics when you're done man I wanna see what you're doing light wise. Case lighting fascinates me. 