# We developed a custom carrier board , and hdmi port not shown

**URL:** <https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181>\
**Category:** Jetson AGX Xavier\
**Tags:** board-design\
**Created:** [May 6, 2020, 1:32pm UTC](https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181 "2020-05-06T13:32:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![icson.zhou](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@icson.zhou](https://forums.developer.nvidia.com/u/icson.zhou)\
**Post date:** [May 6, 2020, 1:32pm UTC](https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181/1 "2020-05-06T13:32:10Z")

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we developed a custom board for xavier, the hdmi pin was the same as the develop kit . we flashed a new module in develop kit and it works correct. But when i put it in our board, the hdmi not shown.

I known i should modify the devicetree, but i want to the hdmi output show first. Should i make some **MUST** changes and flash to the module? Does the L4T OS **LIMIT** it to show?

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [May 7, 2020, 3:30am UTC](https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181/3 "2020-05-07T03:30:23Z")

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Hi,

It is a conflict that you already knew you need to modify device tree and still want monitor to display something out.

For most custom carrier board cases, the regulator to provide power source is different from devkit and you have to configure it in dts and re-flash the dtb.

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [May 11, 2020, 5:59am UTC](https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181/5 "2020-05-11T05:59:29Z")

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Please file a new topic for usb issue. This one is only for HDMI.

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**Author:** ![TomNVIDIA](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/tomnvidia/32/14181_2.png) [@TomNVIDIA](https://forums.developer.nvidia.com/u/TomNVIDIA)\
**Post date:** [October 18, 2021, 6:22pm UTC](https://forums.developer.nvidia.com/t/we-developed-a-custom-carrier-board-and-hdmi-port-not-shown/122181/7 "2021-10-18T18:22:41Z")

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Closed on October 18, 2021, 6:22pm UTC