# No power at laser output connector

**URL:** <https://forum.sienci.com/t/no-power-at-laser-output-connector/27030>\
**Category:** 🔥 Laser\
**Created:** [September 1, 2026, 4:24pm UTC](https://forum.sienci.com/t/no-power-at-laser-output-connector/27030 "2026-09-01T16:24:12Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![\_Michael](https://forum.sienci.com/user_avatar/forum.sienci.com/_michael/32/2962_2.png) [@\_Michael](https://forum.sienci.com/u/_Michael)\
**Post date:** [September 5, 2026, 3:41pm UTC](https://forum.sienci.com/t/no-power-at-laser-output-connector/27030/9 "2026-09-05T15:41:46Z")

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Are you running the stock firmware?

Awhile back I flashed grblHAL, built with the grblHAL web builder, to my SLB on my LongMill Mk1. Everything was working fine until I needed to use my laser. I couldn’t get it working and wanted to proceed with my project so I flashed it back to sienciHAL and my laser worked again.

I don’t know if I missed something in the web builder configuration or the settings somewhere in gSender but I got it working pretty quickly when I switched back.

My laser is 3rd party with it’s own power source and I just need a PWM signal to control the power so I think the setup is probably the same as yours.

Not sure if any of this relates to your problem but I thought it was worth mentioning.

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