# 32×64 HUB75 panel stays off or shows scrambled output with Adafruit HAT (SM16380SC) **URL:** \ **Category:** Uncategorized\ **Created:** [September 16, 2025, 6:35pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/32x64-hub75-panel-stays-off-or-shows-scrambled-output-with-adafruit-hat-sm16380sc/1121 "2025-09-16T18:35:30Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Vis](https://avatars.discourse-cdn.com/v4/letter/v/85e7bf/32.png) [@Vis](https://rpi-rgb-led-matrix.discourse.group/u/Vis)\ **Post date:** [September 16, 2025, 6:35pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/32x64-hub75-panel-stays-off-or-shows-scrambled-output-with-adafruit-hat-sm16380sc/1121/1 "2025-09-16T18:35:30Z")
# Hardware Setup - Raspberry Pi 3B+ - Adafruit RGB Matrix + Real Time Clock HAT - HUB75 32×64 LED panel (non-standard, mixed-chip variant) - Ribbon cable (HAT → panel) - Power: LRS-100-5 Meanwell feeding the HAT, Pi powered through the HAT **Panel ICs observed:** - SM16380SC (LED driver) - RUC7258D (row/scan driver) - DP245D (timing/buffer IC) * * * # Software Environment - OS: Raspberry Pi OS Bookworm - Library: hzeller/rpi-rgb-led-matrix (latest pull) - Demo command used: sudo ./demo --led-gpio-mapping=adafruit-hat --led-rows=32 --led-cols=64 -D 0 * * * # Issue Description - Running the demo initially produces no output. - If the HUB75 ribbon is disconnected, some LEDs flicker randomly. - Reconnecting makes the matrix react to commands, but the display is scrambled: animations distort, colors are wrong, and movement looks erratic. This behavior resembles what others have seen with panels that need special initialization for unsupported driver ICs. * * * # Steps Already Tried - Disabled onboard audio in `config.txt` (`dtparam=audio=off`). - Tested both `--led-gpio-mapping=adafruit-hat` and the default mapping. - Verified ribbon cable orientation (pin 1 → pin 1). - Ran demos with `--led-no-hardware-pulse` (result: flicker, still scrambled). - Checked power stability from the LRS-100-5; Pi is powered through the HAT. - Tried `--led-panel-type=FM6126A` and `--led-panel-type=FM6127` (incompatible). - Tested the FM6126 reset script (`resetmatrix.py`), no effect on this SM16380-based panel. * * * # Observations - Random flicker with the ribbon detached is consistent with floating inputs. - With the ribbon connected, the panel shows activity but outputs are garbled, suggesting the ICs aren’t initialized correctly. - The progression (no output → flicker → scrambled) aligns with known cases of unsupported chips. * * * # Request for Help This panel uses SM16380, RUC7258D, and DP245D ICs, and doesn’t respond to existing `--led-panel-type` options. - Has anyone managed to drive SM16380-based panels with this library? - Is there a known init/reset sequence for these chips? - Would adapting the library or writing a custom init script be the way forward? * * * # References - [Issue #745](https://github.com/hzeller/rpi-rgb-led-matrix/issues/745) - [Discourse: SM16380SH panel](https://rpi-rgb-led-matrix.discourse.group/t/led-panel-p2-6-250x250-mm-96x96px-with-sm16380sh/1030/2) ---
**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:** [September 16, 2025, 7:38pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/32x64-hub75-panel-stays-off-or-shows-scrambled-output-with-adafruit-hat-sm16380sc/1121/2 "2025-09-16T19:38:39Z")
> **[GitHub - hzeller/rpi-rgb-led-matrix: Controlling up to three chains of 64x64, 32x32,...](https://github.com/hzeller/rpi-rgb-led-matrix?tab=readme-ov-file#panels-supported)** > > Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO gives a link to [Led\_drivers · board707/DMD\_STM32 Wiki · GitHub](https://github.com/board707/DMD_STM32/wiki/Led_drivers) and it says SM16380 is SM-PWM, which will not work with and library that does pixel pushing line by line along with PWM refresh ---
**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:** [September 16, 2025, 9:07pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/32x64-hub75-panel-stays-off-or-shows-scrambled-output-with-adafruit-hat-sm16380sc/1121/3 "2025-09-16T21:07:44Z")
> [@Vis](#): > > Has anyone managed to drive SM16380-based panels with this library? No > [@Vis](#): > > Is there a known init/reset sequence for these chips? See this: > > > Does anybody sucessfull make control led matrix 64x32 with mbi5153 (icn2053) le…d driver ic > New matrix P5 64x32 comes with new IC led driver (Same as P2.5 matrix) > P5 Matrix with mbi5038 (icn2038) ic led driver works fine on this project (only transform passed) > Any idea ? > Thanks.