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    • José Rubén Córdova RodríguezJosé Rubén Córdova Rodríguez
      Participant
      @jrubencr
      2021-03-24 at 23:57
      Post count: 18
      #2355

      Recently, i had found a 5V pair of terminals in a STVC101 main board, with a J25 mark (shown in the image). I wonder if by soldering those terminals I will be able to use a 5V power supply instead of the commonly used 12 V.

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    • Fiona LiuFiona Liu
      Keymaster
      @bancroft
      2021-03-25 at 13:16
      Post count: 371
      #2363

      Hi, your idea is correct, you only need to solder J25 and then you can only use the 5v power supply.

      J17 is only the serial port that does not affect the power supply.

       

       

    • STVC007STVC007
      Participant
      @stvc007
      2021-06-08 at 23:09
      Post count: 14
      #2513

      If we solder J25 … does this mean that we can power the screen from the usb ? or directly from the arduino ? thanks!

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      • Nigel TianNigel
        Member
        @nigel
        2021-06-09 at 10:31
        Post count: 55
        #2519

        If you switch the jumper on the converter to USB, you can directly power the display by the USB mini port on the converter. No need to solder the J25. J25 is for the VCC input power voltage.

      • STVC007STVC007
        Participant
        @stvc007
        2021-06-10 at 00:58
        Post count: 14
        #2524

        Thank you for your answer, but i already tried that and it did not work, i must be doing something wrong but when i switch the jumper to USB on the converter the screen can not turn on, starts blinking, please see attached files.

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      • Nigel TianNigel
        Member
        @nigel
        2021-06-10 at 09:38
        Post count: 55
        #2529

        I’ve consulted with the engineer and it seems that the USB power option just provides 5V DC, so I was wrong at the beginning. Only when the display was set as 5V mode can works with this mode.

        And the USB port have limited power, only up to 500 mA, so it is difficult to power on some big size display. 7 inches is not recommended to power on by USB. Only smaller size like 4.3, 3.5 is available to use USB power.

      • STVC007STVC007
        Participant
        @stvc007
        2021-06-10 at 11:38
        Post count: 14
        #2533

        I figured but i was intrigued  and wanted to confirm, yes USB provides 5V and if the screen is changed to 5V i thought it can be powered by the USB maybe … thank you!

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