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Official RPI 7'' Touch screen power requirements ???

romeplstilchen

Hello,

 

as soon as I plugged the official 7'' screen on may RPI 4, the firmware logo appeared

 

Raspberry Pi 7” Touchscreen Display

 

the one that says, there is a problem with the power supply

 

anyway in the end, I want to power the screen (and other peripherals)  with an external power supply

 

but I cannot find any power requirement about that very screen

 

thanks for your help

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  • Hi,

     

    The display consumption alone is about 550mA at 5V.

    With my Pi 3B attached to it, I see about 750 mA total power consumption (Pi + display) when the Pi is idling and not attached to anything else, and with a WiFi connection to a network but not transferring anything. You can use online Pi 3B and Pi 4 supply current consumption measurements done by others to extrapolate.

     

    However, to actually start up the Pi 3B with the display, current bursts to beyond 1100mA need to be supported by the power supply for the Pi + display. And once the Pi is running applications then of course the overall current consumption of the Pi and Display can exceed that.

     

    If you're getting a power supply related issue you'll need to use an 'official' Pi power supply, because it outputs slightly higher voltage of 5.1V, not 5.0V, and has heavier gauge wire to reduce the voltage drop at times of high current demand.

     

    If you're running a high load from the Pi's USB connectors or 40-way connector, then you may need to investigate other ways to power the peripherals independently. So, for instance, a USB keyboard or mouse would be fine, but a USB powered spinning drive might not - it's experimental because there is no datasheet specifying the precise limit, it's a low-end consumer product.

  • in reply to shabaz

    I just completed a project that used the OEM Pi 7" screen and Pi3B+ running bookworm. I experienced no power issues.

    A number of years ago I made the decision to only use OEM Pi power supplies. I found that the aliexpress 3.0Amp spec'd power supply just didn't cut it. Sometimes they worked and sometimes I would catch a flashing power supply warning. Occasionally a screen warning.

    The cost of OEM power supplies is greater compared to aliexpress. Using the OEM rated power supply ensures me that I have don't have to chase power supply issues.

    That reminds me, I need to order some Pi power supplies.

Reply
  • in reply to shabaz

    I just completed a project that used the OEM Pi 7" screen and Pi3B+ running bookworm. I experienced no power issues.

    A number of years ago I made the decision to only use OEM Pi power supplies. I found that the aliexpress 3.0Amp spec'd power supply just didn't cut it. Sometimes they worked and sometimes I would catch a flashing power supply warning. Occasionally a screen warning.

    The cost of OEM power supplies is greater compared to aliexpress. Using the OEM rated power supply ensures me that I have don't have to chase power supply issues.

    That reminds me, I need to order some Pi power supplies.

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