[SOLVED] 5V led doesn't lit on PicoCore MX8 base board (i.MX8ULP)

    I've got PicoCore MX8 base board with i.MX8ULP SOM. I noticed that +5V led on board doesn't lit. Input voltage is 5V. Linux system, UART A and Ethernet works fine. Also I measured the voltage on C75 (+5VS) and it's exactly match 5V.



    What is wrong?

    I found out this LED is connected to 5V source directly, so I decided to check a current path to this LED. I check the board by microscope and... I saw there is no resistor (R81) on the board! It wasn't even soldered at all! I've got two same boards, and the second one has this resitor. I soldered it myself and now LED lights. So the question is how you guys check the products before selling.


    [IMG:https://i.ibb.co/G2sFRfz/no-resistor-issue.jpg]

  • paullegart

    Changed the title of the thread from “5V led doesn't lit on PicoCore MX8 base board (i.MX8ULP)” to “[SOLVED] 5V led doesn't lit on PicoCore MX8 base board (i.MX8ULP)”.