# pHat Beat, one LED always on full bright white when powered up

**URL:** <https://forums.pimoroni.com/t/phat-beat-one-led-always-on-full-bright-white-when-powered-up/5092>\
**Category:** Support\
**Created:** [June 22, 2017, 2:44pm UTC](https://forums.pimoroni.com/t/phat-beat-one-led-always-on-full-bright-white-when-powered-up/5092 "2017-06-22T14:44:07Z")\
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**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\
**Post date:** [June 22, 2017, 6:37pm UTC](https://forums.pimoroni.com/t/phat-beat-one-led-always-on-full-bright-white-when-powered-up/5092/3 "2017-06-22T18:37:27Z")

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Is that using the same SD card?

The LEDs on pHAT BEAT are “smart”- IE they expect a data/clock line to send them some kind of logical signal, but sometimes random noise (from your hands, the environment, your Pi, anything really) will get interpreted as a signal and cause an LED to light up.

It could also be something running on the Pi, if you changed the SD card.

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