JD20U LED Lights Not Working
Published at: 2026-05-21
Visible light, mode selection, and infrared light check
Potential Causes
- A treatment mode has not been selected.
- Different modes activate different LED lights.
- Near-infrared light is invisible to the human eye.
- Some LED beads may be blocked or damaged.
- The device may need further inspection.
Troubleshooting Steps
- Select a mode first
After turning on the device, press the Mode button to select a treatment mode. - Check different modes
Switch between M01, M02, and M03 to observe whether the visible lights change. - Understand normal LED behavior
Different modes use different light combinations, so not all LED lights will be visible at the same time. - Note that near-infrared light is invisible
JD20U includes near-infrared light, which cannot be seen by the human eye. If you cannot see infrared light, this is normal and does not necessarily mean the LED is not working. - Check for visible damage
Check whether any LED bead looks cracked, burned, blackened, or physically damaged.
Details
Different modes activate different light combinations, so the LED pattern may look different depending on the selected mode. Please also note that near-infrared light is invisible to the human eye, so you may not be able to see it during use.
If the blue light does not turn on in M01 mode, if visible LED lights do not turn on in any mode, or if individual LED beads appear damaged, please prepare your order number, clear photos or video showing the LED behavior, and your device SN code / Serial Number, then fill out the form.
Where to find the SN code:
For the JMOON by Ulike ReGlow Max (JD20U), the SN code / Serial Number is located at the bottom of the device, near the area below the Jmoon logo.
For the JMOON by Ulike ReGlow Max (JD20U), the SN code / Serial Number is located at the bottom of the device, near the area below the Jmoon logo.
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