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Logitech G15 numpad LED flickering

post #1 of 7
Thread Starter 
So, I've had this G15 (rev 1) for years and really like it. Just took it to quakecon this weekend, and about halfway through the backlight on the numpad started flickering. The rest of the keyboard is fine and the numpad keys still works, just the backlight flickers. Anyone know what might cause this? I contacted logitech ages ago about another small issue, and they said it was out of warranty then and they didn't have any replacements anyway. So that option is out.

I will probably open it up later and look for anything that may be wrong, but I don't really know much about circuitry unless there is a very obvious short. I did find one guide for replacing the LEDs, but of all the threads I looked in where people had this issue no one ever reported a reliable fix. Anyone have any ideas or experience with this? Thanks!
Edited by ChIck3n - 8/11/11 at 10:21pm
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post #2 of 7
It might be an underpowered usb port. Try switching ports. It could also be those year old cheetos shorting something out in there:D.

Good luck. I have a rev1 for years before I broke some wiring in the cable. Rev 2 just isn't the same.
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post #3 of 7
Thread Starter 
Ya, tried different ports. Plus, I would think an underpowered port would make the whole thing flicker. I'm thinking something may have gotten knocked loose on the trip and just needs a dab of solder or something. If not, the G510 looks like it would be a decent replacement.
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post #4 of 7
Yeah, you're right. With mine the whole thing would flicker and I wouldn't be able to type anything.

It must be internal to the keyboard then. Have you tried gently popping off the keys and cleaning it? I can't really think of anything else. Too bad the warranty expired.
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post #5 of 7
After three years, my G15 (rev.1) started flickering as well, Its a good hardy gaming keyboard but the keys lost there luminescence a long time ago. I'd hate to get rid of it just because of that, So I recently bought the Logitech G13 Gaming pad and just moved my keyboard on top of my desk and kept the G13 and R.A.T. 7 on the desks Keyboard tray. my keyboard is just auxiliary as I have my G13 for gaming and use the G15's LCD to monitor Temps and volts. I'll keep this keyboard till it stops working all together, I bought it for Doom III! And It Still Looks Better than most new Gaming Keyboards till this day!
    
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post #6 of 7
Thread Starter 
Well, pulled it open. There is a row of 11 LEDs along the bottom, and only the one on the end flickers. The weird thing is that it stopped a few times and acted normal, then I unplugged it an plugged it back in and the flickering started again.

Now, I really don't know much about electronics. But it seems there is something wrong with either the LED or the little resistor under it. All the LEDs are on the same circuit, so I don't think it could be anything else. It worked for years, so what could have happened? LEDs are supposed to last a long time, but IDK about the resistors. Any idea on what would be more likely to cause this and how to fix it?

The LEDs are rectangular, so it may be hard to find the kind that work. And the resistor is quite small, so I would have to find someone else to replace that. Heck, I'm not even sure I could solder the LED back on (or take it off in the first place tongue.gif). I may just try heating it up tomorrow to see if something is just a bit loose.

Edit: After a few tests, it seems to not flicker after it has been unplugged for a few minutes (well, flickers for a few seconds than stops). If I unplug and plug it back in it starts again.

Edit2: Held another LED up to it, and it doesn't flicker. Guess that means the LED is just going bad?
[ame]http://www.youtube.com/watch?v=8bZwHkHaU7k[/ame]

So, anyone know where to find rectangular blue LEDs?
Edited by ChIck3n - 8/11/11 at 11:32pm
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post #7 of 7
Thread Starter 
Alright, for anyone who finds this I did manage to fix it.

I got a rectangular blue LED at radioshack, but it was too big. I filed it down to the right size (had to take off about half of it) and replaced the old LED with it. Besides having a slightly different color it works just fine. Very easy, should be able to be done by anyone with even minimal soldering skill (mine is VERY minimal). Just be sure not to remove the little resistor under the LED.

I did test the LED on another spot, and it didn't flicker. Seems like it just got angry and didn't get along with that one resistor anymore. Good luck to anyone else with this issue!
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