6 votes
Accepted

Can't turn on ACT LED on baremetal Pi3

Models A and B The green activity LED (GPIO 16) may be written. Models A+ and B+ The green activity LED (GPIO 47) may be written. The red power LED (GPIO 35) may be written. The high USB power mode ...
joan's user avatar
  • 71.1k
2 votes

Pi 3 on-board LEDs

Having done some research myself I can't seem to come across any resources that explain how the LEDS work. I suspect the LEDs are something that are hardwired into the Ethernet port and are not ...
Darth Vader's user avatar
  • 4,206
2 votes
Accepted

Normal Work of RPi 3B+

The red LED is the power indicator, it should be on whenever you have your pi plugged in. The green LED is the sd card access indicator; it goes on when the pi is accessing the sd card (which is like ...
Benjamin Ashbaugh's user avatar
2 votes

raspberry pi no rainbow screen

There's been a few reports of RPi 3Bs where there's no 3.3V power supply from the on-board voltage regulator. If you have a multimeter check between pin #1 and pin #6 on the GPIO header (carefully ...
Dougie's user avatar
  • 5,311
2 votes
Accepted

I inverted 2 GPIO pins. Is pi4 dead?

I think you mean "shorted" and not inverted. And yes, this is fatal for the PMIC (power management IC). Your Pi is dead.
kwasmich's user avatar
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1 vote
Accepted

ACT LED stops blinking, Raspberry Pi booting and reading from card as always

I found the reason, the resistor connected to the LED fell off (I checked the diagram is 1kOhm). I had to accidentally hook it or it was poorly soldered to the board.
andrewt's user avatar
  • 21
1 vote

ACT LED stops blinking, Raspberry Pi booting and reading from card as always

I ran external led on GPIO and it flashing. Presumably you mean, you found it flashing at points when the ACT led wouldn't. The problem with this is that the ACT led only flashes when there is ...
goldilocks's user avatar
  • 58.9k
1 vote

ACT Light of Raspberry Pi is not ON continuously

The ACT (green) LED is configured in firmware to flash a "code" when there is a failure in boot process. The code has changed over time. I did a quick search for raspberry pi ACT LED codes. ...
Seamus's user avatar
  • 22k
1 vote

RPi 4B ACT solid green

If the LED blinks 4 times when you power it on with NO SD card is inserted, there is a chance that you have an SD card error: https://www.raspberrypi.org/forums/viewtopic.php?t=250183 ... had solid ...
Paamand's user avatar
  • 111
1 vote

RPi 4B ACT solid green

Your RPi4B is dead. The fix will cost somewhere between £35 and £55 depending which model you've shot dead. Never pull wires off a powered up Raspberry. Power down first. Check wiring, check it again ...
Dougie's user avatar
  • 5,311
1 vote

Raspberry Pi 3 Model A+ Faint green pinprick light steady flashing

Okay - the problem was a silly one. I just unzipped the raspbian lite img file and copy pasted the disk image. I decided to reformat the sd, and use etcher to write the entire img file to the sd, ...
RenegadeAndy's user avatar
1 vote

Act LED flashing 3 times quickly after boot

Looks like my RootFS actually got corrupt. A lot of files in /bin and /etc were missing (e.g. passwd files + its backups and shadows), which rendered the whole system useless. The only thing I could ...
Unkn0wn's user avatar
  • 23
1 vote

Act LED flashing 3 times quickly after boot

So, if nothing has changed, but something has changed it must be magic – or DHCP (which some would argue is the same thing). But seriously, from what you've described it sounds like the Pi's IP ...
dlu's user avatar
  • 459
1 vote

Can't turn on ACT LED on baremetal Pi3

Expanding joan's answer: Raspberry Pi 3 B+ (1 GiB RAM) and A+ (512 MiB RAM) The green activity LED (GPIO 29) may be written The red power LED is connected to MXL7704 power management IC and is not ...
iBug's user avatar
  • 315
1 vote

Green Led (ACT) is blinking for mmc0 without SD card activity

I have also asked this question Why is the green LED (ACT) blinking without SD card activity also at the Raspberry Pi Forum and received this answer: by rpdom » Wed Feb 22, 2017 8:02 pm From what I ...
Frank Breitling's user avatar

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