# RX480E-4C: The LED Blinks, but Why Do D0-D3 Show No Output?

**URL:** <https://rx480e.discourse.group/t/rx480e-4c-the-led-blinks-but-why-do-d0-d3-show-no-output/21>\
**Category:** Trouble\
**Created:** [October 21, 2026, 8:41am UTC](https://rx480e.discourse.group/t/rx480e-4c-the-led-blinks-but-why-do-d0-d3-show-no-output/21 "2026-10-21T08:41:07Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Zercher](https://yyz2.discourse-cdn.com/flex012/user_avatar/rx480e.discourse.group/zercher/32/21_2.png) [@Zercher](https://rx480e.discourse.group/u/Zercher)\
**Post date:** [October 21, 2026, 8:41am UTC](https://rx480e.discourse.group/t/rx480e-4c-the-led-blinks-but-why-do-d0-d3-show-no-output/21/1 "2026-10-21T08:41:08Z")

</div>

Hello!

 ![image](https://canada1.discourse-cdn.com/flex012/uploads/rx480e/original/1X/97f5d9494dd66e9e921aec0b6a0f5e2ed6890a8f.png)  
My remote works and the LED is blinking when remote button is pressed. But no matter which mode I’m in, no power I being emitted through D0-D3?

I keep seeing the same comment: the remote works and the receiver LED blinks, but D0-D3 seem to have no output.

Are you also experiencing the same problem?

D0-D3 are **signal outputs** , not power rails. The manual gives a maximum output current of 10 mA, so don’t connect a relay coil, lamp, or motor directly.

To check the signal, re-pair at DC 3V-5V, choose a mode, and disconnect the load. Measure D0 to GND before, during, and after a button press.

Which signal result do you get: no change, a change only while pressed, or a change that stays after release?

Manual: [RX480E-4C](https://qiachip.github.io/qiachip/RX480E/RX480E-4C/QIACHIP_RX480E-4C/)