[SOLVED] [STM32F746-DISCO USB Does not work] What happens when I connect two jumpers on JP1 ? I connected both 5V_USB_ST_LINK and 5V_USB_HS to 5V (On JP1) and now USB-HS OTG doesnt seem to work anymore.

[yuvaraj8blr]

Board: STM32F746NG Discovery Board

I misinterpreted the Power Supply Jumper JP1 on the STM32F746NG Board. :\

I connected two jumpers on JP1. One that connects 5V_USB_ST_LINK to 5V and another on 5V_USB_HS and 5V.

USB-HS-OTG Functions stopped working after I did this.

I tried the following already (But it did not help):

• Using only 5V_USB_ST_LINK jumper on JP1
• Using only a 5V External Supply on E5V

USB Devices on USB-HS that were earlier detected, are not being detected anymore.

From the schematic, I do not see anything major that can go wrong. But I do not know if I burnt something:| Can I get it working again?

The schematics are in the attachments in this link: Arrow-STM32F746Discovery

:white_heavy_check_mark:�? SOLUTION: :white_heavy_check_mark:�?

The problem was that there was a soldering waste (Which was found out using a magnifying glass) that was stuck between the USB Data lines.

After removing the short, USB FS works as normal now.

Information to power up the USB FS over ST-LINK or through other power sources is explained in the STM32F746-DISCO Usermanual : https://www.st.com/resource/en/user_manual/dm00190424-discovery-kit-for-stm32f7-series-with-stm32f746ng-mcu-stmicroelectronics.pdf (Section 4.4)

[yuvaraj8blr · Accepted solution]

:white_heavy_check_mark:�? SOLUTION: :white_heavy_check_mark:�?

The problem was that there was a soldering waste (Which was found out using a magnifying glass) that was stuck between the USB Data lines.

After removing the short, USB FS works as normal now.

Information to power up the USB FS over ST-LINK or through other power sources is explained in the STM32F746-DISCO Usermanual : https://www.st.com/resource/en/user_manual/dm00190424-discovery-kit-for-stm32f7-series-with-stm32f746ng-mcu-stmicroelectronics.pdf (Section 4.4)