# Yoyofactory Kui LEDs are flickering and fading? **URL:** \ **Category:** Yo-Yo Mods and Maintenance\ **Created:** [August 18, 2018, 1:32pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875 "2018-08-18T13:32:01Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![petergrey86](https://avatars.discourse-cdn.com/v4/letter/p/858c86/32.png) [@petergrey86](https://forums.yoyoexpert.com/u/petergrey86)\ **Post date:** [August 18, 2018, 1:32pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/1 "2018-08-18T13:32:01Z")
Hi guys, I recently bought a YYF KUI and I have a problem with the lights. I noticed that the light in one of the metal cups was flickering and fading faster than the other side. To be a bit more specific, the test I did was throwing the yoyo, stabilizing it with my finger nail, and then looking at the lights: with stable rotation one of the lights seems to have problems. I though it was a battery problem, so today I new ones and changed them. I used a suction cup to remove the plastic cup, in order to avoid scratches. It seems the problem was not the battery and I did not want to work deeper into that in order to not damage it. Did it ever happen the same to you? Any idea? ---
**Author:** ![Myk\_Myk](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/myk_myk/32/63087_2.png) [@Myk\_Myk](https://forums.yoyoexpert.com/u/Myk_Myk)\ **Post date:** [August 18, 2018, 8:38pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/2 "2018-08-18T20:38:31Z")
I don’t know what the switching mechanism is on the KUI, but it sounds like one side is requiring too much centrifugal force to engage. You may just need to contact the store, or YYF… Keep playing with it for a bit though. It may even work itself out. ---
**Author:** ![YoYoExpertGarrett](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/yoyoexpertgarrett/32/1543_2.png) [@YoYoExpertGarrett](https://forums.yoyoexpert.com/u/YoYoExpertGarrett)\ **Post date:** [August 20, 2018, 5:18pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/3 "2018-08-20T17:18:14Z")
If changing the Batteries did not work then it might be a problem with the lights themselves. Did you buy it from us? If so give us a call or send an email and we can take care of it for you. Also for future reference on the KUI - There’s a small hole on each side (under the axle) where you can poke through with a hex key to pop the caps off. ---
**Author:** ![Ratmaster2014](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@Ratmaster2014](https://forums.yoyoexpert.com/u/Ratmaster2014)\ **Post date:** [May 21, 2019, 2:58am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/4 "2019-05-21T02:58:16Z")
Can the yoyo being to tight or to loose make the lights behave differently ---
**Author:** ![codinghorror](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/codinghorror/32/8052_2.png) [@codinghorror](https://forums.yoyoexpert.com/u/codinghorror)\ **Post date:** [May 21, 2019, 3:03am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/5 "2019-05-21T03:03:28Z")
No, that shouldn’t matter. The yo-yos spin forces the electrical switch closed and it should light up. What are you seeing? ---
**Author:** ![Ratmaster2014](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@Ratmaster2014](https://forums.yoyoexpert.com/u/Ratmaster2014)\ **Post date:** [May 21, 2019, 3:23am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/6 "2019-05-21T03:23:21Z")
The lights go light to dim the it flashes ---
**Author:** ![Phantisee86](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/phantisee86/32/59016_2.png) [@Phantisee86](https://forums.yoyoexpert.com/u/Phantisee86)\ **Post date:** [May 21, 2019, 4:47pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/7 "2019-05-21T16:47:18Z")
I had an issue with my light up fhz. Don’t know if it is a similar design, but in the fhz, there were little strips of metal that are very flexible. When the yoyo was spinning, the strips would be pushed down/outward and touch another piece of metal to complete the circuit and send power to the lights. On the flickering half, I noticed the strip of metal rested a little higher when not spinning. So I VERY CAREFULLY bent it downward just a bit. It worked. I no longer have the fhz, but if I need to clarify anything I will do my best. ---
**Author:** ![YoYoExpertGarrett](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/yoyoexpertgarrett/32/1543_2.png) [@YoYoExpertGarrett](https://forums.yoyoexpert.com/u/YoYoExpertGarrett)\ **Post date:** [May 21, 2019, 5:38pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/8 "2019-05-21T17:38:22Z")
> [@Ratmaster2014](#): > > The lights go light to dim the it flashes On both halves or just one? Centrifugal force is what’s triggering the lights to turn on, so as the yo-yo slows down this will happen normally. If this is happening on a strong throw then there may be an issue. ---
**Author:** ![Ratmaster2014](https://avatars.discourse-cdn.com/v4/letter/r/bbce88/32.png) [@Ratmaster2014](https://forums.yoyoexpert.com/u/Ratmaster2014)\ **Post date:** [May 22, 2019, 1:21pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/9 "2019-05-22T13:21:20Z")
On just one side can I return it to get a new one ---
**Author:** ![codinghorror](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/codinghorror/32/8052_2.png) [@codinghorror](https://forums.yoyoexpert.com/u/codinghorror)\ **Post date:** [May 22, 2019, 9:07pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/10 "2019-05-22T21:07:46Z")
Contact YYE directly if you bought it from them and they can help you out. ---
**Author:** ![yyfben2.deactivated](https://avatars.discourse-cdn.com/v4/letter/y/ccd318/32.png) [@yyfben2.deactivated](https://forums.yoyoexpert.com/u/yyfben2.deactivated)\ **Post date:** [May 22, 2019, 9:09pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/11 "2019-05-22T21:09:44Z")
or me, Ill send a new curcuit board ---
**Author:** ![codinghorror](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/codinghorror/32/8052_2.png) [@codinghorror](https://forums.yoyoexpert.com/u/codinghorror)\ **Post date:** [June 27, 2019, 11:55pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/12 "2019-06-27T23:55:02Z")
> [@petergrey86](#): > > I noticed that the light in one of the metal cups was flickering and fading faster than the other side. To be a bit more specific, the test I did was throwing the yoyo, stabilizing it with my finger nail, and then looking at the lights: with stable rotation one of the lights seems to have problems. I though it was a battery problem, so today I new ones and changed them. I used a suction cup to remove the plastic cup, in order to avoid scratches. It seems the problem was not the battery and I did not want to work deeper into that in order to not damage it. I’m actually seeing exactly this “one side is dimmer / activates less reliably” on both Kuis I own. Is this something I can fix @yyfben2.deactivated or is circuitboard swap the only way? It looks to me like the gravity (centrepital force or whatever) activation switch is an all internal kinda deal, it doesn’t look tweakable to my eye. ---
**Author:** ![8bitviet](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/8bitviet/32/42930_2.png) [@8bitviet](https://forums.yoyoexpert.com/u/8bitviet)\ **Post date:** [June 28, 2019, 12:00am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/13 "2019-06-28T00:00:57Z")
Same here. Solved issue by switching over to Aurora. 😏 ---
**Author:** ![TheThrowingGnome](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/thethrowinggnome/32/14231_2.png) [@TheThrowingGnome](https://forums.yoyoexpert.com/u/TheThrowingGnome)\ **Post date:** [June 28, 2019, 12:07am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/14 "2019-06-28T00:07:42Z")
But my Aurora had one dim side too! ---
**Author:** ![8bitviet](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/8bitviet/32/42930_2.png) [@8bitviet](https://forums.yoyoexpert.com/u/8bitviet)\ **Post date:** [June 28, 2019, 12:10am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/15 "2019-06-28T00:10:19Z")
RIP. Swap halves and see if that works? ---
**Author:** ![TheThrowingGnome](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/thethrowinggnome/32/14231_2.png) [@TheThrowingGnome](https://forums.yoyoexpert.com/u/TheThrowingGnome)\ **Post date:** [June 28, 2019, 12:14am UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/16 "2019-06-28T00:14:36Z")
Too late sold it! The dim side annoyed me too much. ---
**Author:** ![YoYoExpertGarrett](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/yoyoexpertgarrett/32/1543_2.png) [@YoYoExpertGarrett](https://forums.yoyoexpert.com/u/YoYoExpertGarrett)\ **Post date:** [June 28, 2019, 3:59pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/17 "2019-06-28T15:59:36Z")
> [@codinghorror](#): > > I’m actually seeing exactly this “one side is dimmer / activates less reliably” on both Kuis I own. Have you tried replacing the batteries? ---
**Author:** ![yyfben2.deactivated](https://avatars.discourse-cdn.com/v4/letter/y/ccd318/32.png) [@yyfben2.deactivated](https://forums.yoyoexpert.com/u/yyfben2.deactivated)\ **Post date:** [June 28, 2019, 6:58pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/18 "2019-06-28T18:58:56Z")
Board swap recommend ---
**Author:** ![YoYoExpertGarrett](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/yoyoexpertgarrett/32/1543_2.png) [@YoYoExpertGarrett](https://forums.yoyoexpert.com/u/YoYoExpertGarrett)\ **Post date:** [June 28, 2019, 8:08pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/19 "2019-06-28T20:08:54Z")
Board swap recommended over battery replacement? How many TV remotes do you just throw away? Anyway - Yeah, we can definitely replace the boards for you, that’s usually the **second** option… Feel free to send me a PM and I can arrange to get new boards shipped out. ---
**Author:** ![bobafret](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/bobafret/32/260814_2.png) [@bobafret](https://forums.yoyoexpert.com/u/bobafret)\ **Post date:** [June 28, 2019, 8:54pm UTC](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875/20 "2019-06-28T20:54:04Z")
> [@TheThrowingGnome](#): > > But my Aurora had one dim side too Both of the single color version Auroras I had did that but both of the multicolored ones I got are STRONG and consistent. [Next page](https://forums.yoyoexpert.com/t/yoyofactory-kui-leds-are-flickering-and-fading/291875.md?page=2)