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The red led repeatedly blinks 4 long 4 short and the Pi doesn't boot. Tested with various power adapters.

When powered up without an SD card the red led is solid. I'm using an SD card that works fine with a RPi 2 and 3B.

What could be the problem?

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    This is a bit light on detail. It would be nice to know if the Pi boots and such like. – joan Aug 29 '18 at 14:55
  • @joan updated. Any other details? – Sparkler Aug 29 '18 at 14:57
  • check if tinycore supports the 3B+ - last I read, it did not – Jaromanda X Aug 30 '18 at 6:38
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RED LED is controlled by "STATUS_LED_R" signal. Only solid knowledge available to public is that RED LED is a power indicator and turns off when RPi supply voltage goes bellow 5V with some tolerance. Even with "reduced schematic" it really does not matter from where this STATUS signal comes from, what is important is its absence indicating power problem with your SD CONNECTOR, long time known "problem" - they do go bad! If your SD works elsewhere , and your RPi stays on without it - what else is there which is common? Try different SD to verify my guess.

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According to this a blinking red LED indicates power problems but does not specify any pattern to the blinking.

If it were the green LED flashing then further down on the same article has some more suggestions that fit better with your description of four flashes cycling.

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