I noticed the on-board "L" LED does not illuminate on my recently acquired UNO R4 WiFi. I took a close-up picture of the surface-mount LED and it appears it's upside down (contacts up). I can't help but wonder if I am alone with this unique issue. So far, I have not experienced any other problems.
Hi @jasd3472. I apologize for this problem with your board. Please contact the seller you purchased the board from for a replacement.
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I wonder how it passed testing? We simply call them LEDs.
Very simple, if it is soldered the wrong way up, and left to right it will appear electrically the same as it were right. The test rig will not have included a camera to actually look to see if the LED is lighting up.
This was probably an error in filling the component cassette reels for the pick and place machine. It could be a one off or there could potentially be thousands made that way. Fingers crossed is is not widespread, and given that this is the first such post, it looks rare.
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I think you need a replacement. Contact the seller soon.