STM32H747I-DISCO LCD DISPLAY PROBLEM

[vanisrinivasulu]

Split from: https://community.st.com/t5/stm32-mcus-boards-and-hardware/stm32h747i-disco-lcd-display-problem/td-p/643493

Hello, 

May ,I know how to enable the display. I am not getting how to on the backlight of the display 

[vanisrinivasulu]

I was given 5Vsupply to the card using the micro b usb cable and the stm32 board getting 5v .still my display is not enabling ...even with firmware part also i was tried taking the PJ12 Pin (used for BL_CTRL)  taking as output . 

[Sco]

To debug backlight:

First step, please check the "+5V" power is provided well: to probe C3 or C76 on the MB1248.

Second step, if the first step ok: 5V provided well on the MB1248, then to check if on the LCD board(MB1166), whether it gets the 5V well. To probe the C3 or C4 or C5.

Third step, to check if the LCD board gets the 5V well, then to check if the output is good or not, to probe C1 or C2 on the MB1166. Also you can measure the the Vfb(Probe R3 on the MB1166).