STM32H747 LCD display issue

[BTurc.2]

When I flash some .bin the LCD doesen't work. It just display the a noise picture. With similar examples does work and with more advanced examples like the EmbeddedWizard it works too.

When does not work, every time display the same static image:

[ACapo.1]

Thanks for the info, so definitely looks like a faulty board here. I will put in for a return.

[ACapo.1]

And as a final test I erased all Flash and All external memory and then downloaded the hex from @Community member​ I still get the corrupted screen.

[BTurc.2]

I have tried to do the same but it doesn't work. I have 2 STM32H747 and neither of the 2 works. I don't think it's uploading badly the .bin. I honestly don't know what can happen. When I uploade TouchGFX it work's fine.

I bought it to put a camera on it and do something with the AI-Vision pack. But if the exemples don't work...

[ACapo.1]

Did you purchase the two boards at the same time? Did you get them from mouser?

[BTurc.2]

At the same time, but from RS components.

[BTurc.2]

The other screen number is: A225300829

[Sarra.S]

Hello @Community member​ 

I assume you're using LCD revA02 or A01 ? can you confirm that?

Thank you!

[ACapo.1]

There is a pic of Karls board above running an example, it is an A03

[Sarra.S]

Hello all,

Thank you for bringing this issue to our attention.

I confirm the issue and I reported Internally.

Internal ticket number: 147459 (This is an internal tracking number and is not accessible or usable by customers).

Sarra

[BTurc.2]

Hi Sarra,

I wanted to know if it is feasible to fix the screen problem. I bought the board to do a project for the university which has a deadline. It is to know if I have to return them due to lack of time. Could you please tell us how the issue is?

Thanks!

[ACapo.1]

Hi Sarra,

Thanks for the info, so are we thinking these are not faulty boards but rather some issue with the HAL?

Thanks

Andy

[Az.21]

when screen is noise picture, the image classification or person detection is working or not? Is it only screen not displaying picture?@ACapo.1 @BTurc.2 @Sarra.S

[BTurc.2]

I'm not sure. It makes sense that it works. I wanted to try sending the image via USB so I don't have to use the LCD, but I never did it because I thought the problem with the LCD would be fixed soon.

It would be to combine the example of AI with that of the webcam. If I have time I'll give it a try and let you know if it works.

If you try it and it works for you, I would appreciate it if you could confirm it!

[Az.21]

Hey bro I post a new comment to solve the issue, it's hardware problem.

[Az.21]

Hey Guys, GOOD NEWS!

​It's the screen hardware problem, I bought a separate screen (B-LCD40-DSI1 4" WVGA TFT LCD) from mouser, which is same type but can normally display.

​

↓ difference between default screen and separate screen
↓ package of screen module
↓ FP-AI-VISION demo:person detect

[BTurc.2]

I guess the serial number on the screen is different right? Thank you very much for informing us.

[Az.21]

Yes. A03 or 01,02 doesn't matter, they're both A03.

The default screen serial num is A225300780 with a QR code on right.

The new screen is A214500023 without QR code.

[MOBEJ]

Hello ,

The fix is available on GitHub :

https://github.com/STMicroelectronics/STM32CubeH7/commit/1c84713102f8509deb79ae14db8dbb104c17c45e#diff-8a5b12f7040dfb560c495dc0a1213725ba939bf19d531dd1e97067b6a1a79ec0

In fact , LCD DSI MB1166-A9 delivered with latest version of STM32H747I-DISCO/ boards come based on LCD FGRIDA FRD400B25025-A-CTK instead of FRD397B25009-D-CTK.

Now the firmware is updated , you just need to enable the right hardware component as defined in stm32h747i_discovery_conf.h file and add the new component library (NT35510) in your project .

/* IMPORTANT: One of the following flags must be enabled in stm32h747i_discovery_conf.h file */

/* options in order to select the target daughter board revision connected on STM32H747I DISCOVERY : !!!!!!!!!! */

/* USE_LCD_CTRL_OTM8009A */ /* Applicable for all LCD daughter boards (MB1166) except for Rev -A09 */

/* USE_LCD_CTRL_NT35510 */ /* Applicable only for LCD daughter boards (MB1166) Rev -A09 */