# Need help with RGB matrix

**URL:** <https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046>\
**Category:** Uncategorized\
**Created:** [April 2, 2025, 12:07am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046 "2025-04-02T00:07:24Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Midniterocky](https://avatars.discourse-cdn.com/v4/letter/m/e5b9ba/32.png) [@Midniterocky](https://rpi-rgb-led-matrix.discourse.group/u/Midniterocky)\
**Post date:** [April 2, 2025, 12:07am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/1 "2025-04-02T00:07:24Z")

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Hello I am using a raspberry pi 3b+ and 32x64 led matrix from adafruit. But whenever I run my code my matrix does not light up. Please help, I am new and don’t know what I’m doing.

 ![IMG_3091](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/594e2ce85dbac0826d0a5a76006745508818978d.jpeg)

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**Author:** ![Midniterocky](https://avatars.discourse-cdn.com/v4/letter/m/e5b9ba/32.png) [@Midniterocky](https://rpi-rgb-led-matrix.discourse.group/u/Midniterocky)\
**Post date:** [April 2, 2025, 12:08am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/2 "2025-04-02T00:08:22Z")

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![IMG_3092](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/a1d8ff3928f8a9f9792d1079eb9358405fd88b62.jpeg)

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**Author:** ![Midniterocky](https://avatars.discourse-cdn.com/v4/letter/m/e5b9ba/32.png) [@Midniterocky](https://rpi-rgb-led-matrix.discourse.group/u/Midniterocky)\
**Post date:** [April 2, 2025, 12:08am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/3 "2025-04-02T00:08:52Z")

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![IMG_3094](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/d22d3ed698d312f61759f0b1bb50429d29d5f2ad.jpeg)

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**Author:** ![board707](https://avatars.discourse-cdn.com/v4/letter/b/bc79bd/32.png) [@board707](https://rpi-rgb-led-matrix.discourse.group/u/board707)\
**Post date:** [April 2, 2025, 8:05am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/4 "2025-04-02T08:05:44Z")

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> [@Midniterocky](#):
>
> 32x64 led matrix from adafruit.

A clear photo of the rear side of the matrix may helps.  
Also please lookup a chips on the panel and write the indexes to the forum.

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**Author:** ![marcmerlin](https://yyz2.discourse-cdn.com/free1/user_avatar/rpi-rgb-led-matrix.discourse.group/marcmerlin/32/40_2.png) [@marcmerlin](https://rpi-rgb-led-matrix.discourse.group/u/marcmerlin)\
**Post date:** [April 25, 2025, 5:38am UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/5 "2025-04-25T05:38:39Z")

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it’s really hard to read the command lines you used, please try to paste the command line text here, please

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**Author:** ![yocto](https://avatars.discourse-cdn.com/v4/letter/y/c6cbf5/32.png) [@yocto](https://rpi-rgb-led-matrix.discourse.group/u/yocto)\
**Post date:** [August 7, 2025, 2:16pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/need-help-with-rgb-matrix/1046/6 "2025-08-07T14:16:32Z")

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This is a Linux kernel boot parameter. The Raspberry Pi has a multi-core processor. The isolcpus parameter is used to “isolate” a specific CPU core

The suggestion in the command line “to slightly improve display update, add isolcpus=3 at the end of /boot/cmdline.txt and reboot “

There should be instructions online on how to edit that text file.