# 64x64 + Rasp Pi 3B+ | Stretched Output / Wrong Resolution **URL:** \ **Category:** Uncategorized\ **Created:** [February 16, 2021, 8:23pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120 "2021-02-16T20:23:14Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![tobi](https://avatars.discourse-cdn.com/v4/letter/t/b9e5f3/32.png) [@tobi](https://rpi-rgb-led-matrix.discourse.group/u/tobi)\ **Post date:** [February 16, 2021, 8:23pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/1 "2021-02-16T20:23:14Z")
Hi, I purchased a 64x64 LED-Matrix and am now trying out some stuff. Unfortunately I got some problems with my setup. The Problem is, if I use: > –led-cols=64 --led-rows=64 the middlepoint of my output is outside of the panel, but seems to have the right resolution. If I use: > –led-cols=20 --led-rows=64 The middlepoint seems to be (nearly) right, but the output is stretched by 3x. **Here is one picture I took from ./demo -D0 :** (using 64x64 as cols and rows) ![20210216_205829](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/28a4873a43ca85fc20d68a7079f6107e559bdc76.jpeg) **Information in the Matrix:** This is the Amazon-Page of the Matrix: [64x64 LED-Matrix - Janhiny - (german)](https://www.amazon.de/gp/product/B08HPVKWNM/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1) I am using a Raspberry Pi 3B+ for controlling. The OS is Raspbian Lite. And this is the kind if command I use: > sudo examples-api-use/demo -D0 --led-cols=64 --led-rows=64 --led-show-refresh --led-slowdown-gpio=4 --led-pwm-dither-bits=2 --led-chain=1 --led-multiplexing=0 Thanks so far and have a nice day Tobias ---
**Author:** ![tobi](https://avatars.discourse-cdn.com/v4/letter/t/b9e5f3/32.png) [@tobi](https://rpi-rgb-led-matrix.discourse.group/u/tobi)\ **Post date:** [February 16, 2021, 8:25pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/2 "2021-02-16T20:25:41Z")
I can just upload one picture at a time due your rules. So here is a second picture of the problem: (using 20x64 as cols and rows) ![20210216_205752](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/bb80de0e2c31eae09a52fae8c45c5e4b56a302c3.jpeg) ---
**Author:** ![tobi](https://avatars.discourse-cdn.com/v4/letter/t/b9e5f3/32.png) [@tobi](https://rpi-rgb-led-matrix.discourse.group/u/tobi)\ **Post date:** [February 16, 2021, 8:27pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/3 "2021-02-16T20:27:14Z")
And here’s a picture from the backplane of my module. ![20210216_210201](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/04ab67ecc6aba553b12a645755f66748fc9740c7.jpeg) ---
**Author:** ![jens](https://avatars.discourse-cdn.com/v4/letter/j/d2c977/32.png) [@jens](https://rpi-rgb-led-matrix.discourse.group/u/jens)\ **Post date:** [February 22, 2021, 12:53pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/4 "2021-02-22T12:53:36Z")
Hi, i’ve got the same display, same seller, but diffrent from your’s mine has label P3(2121)64x64-32S-M3 and i got it early jan this year. The display is working without any trouble… ---
**Author:** ![tobi](https://avatars.discourse-cdn.com/v4/letter/t/b9e5f3/32.png) [@tobi](https://rpi-rgb-led-matrix.discourse.group/u/tobi)\ **Post date:** [February 23, 2021, 11:57pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/5 "2021-02-23T23:57:35Z")
Hi Jens, thanks for your response. Well, that means that I maybe have done something wrong with the connectors. That’s the obvious conclusion for me. I will check. ---
**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:** [February 27, 2021, 6:57pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/6 "2021-02-27T18:57:53Z")
unfortunately it’s also possible they mailed you a different panel. Vendors change chips all the time and they’re not always compatible. You can try all the command line options from the README.md in case any helps. ---
**Author:** ![tobi](https://avatars.discourse-cdn.com/v4/letter/t/b9e5f3/32.png) [@tobi](https://rpi-rgb-led-matrix.discourse.group/u/tobi)\ **Post date:** [February 27, 2021, 9:19pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/7 "2021-02-27T21:19:54Z")
Hi Marc, I already tried all the options. Unfortunately they didn’t help. I also don’t have the time to write my own configurations to the code, mainly because I would have to dig into C. I’m not into coding for long time, now. I think I just had bad luck with by panel. Maybe there will be a fix later. Or I just buy another panel which works fine. But nevertheless, thank you for your help. ---
**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:** [March 20, 2021, 9:06pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/64x64-rasp-pi-3b-stretched-output-wrong-resolution/120/8 "2021-03-20T21:06:22Z")
Sorry, it’s frustrating that there are so many incompatible panels out there. Good luck finding some that work. If you want a vendor who is pretty reliable, you can try azerone. They’ve only shipped me panels that work (currently FM6126A and FM6127) [https://www.amazon.com/s?i=merchant-items&me=A1QIWERAQGCBKO](https://www.amazon.com/s?i=merchant-items&me=A1QIWERAQGCBKO)