cjan
Posts: 605
Joined: Sun May 06, 2012 12:00 am

red light blink

Wed Jun 13, 2018 10:18 pm

system running fine, but red light blink randomly, what does it mean or Pi dying?

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davidcoton
Posts: 3162
Joined: Mon Sep 01, 2014 2:37 pm
Location: Cambridge, UK

Re: red light blink

Wed Jun 13, 2018 10:48 pm

It means the 5V power supply is going below 4.65V. Either the PSU is inadequate, or the cable from PSU to Pi is too long or thin, or something else is loosing volts along the way.

Which model Pi?
What is connected to it (anything on HDMI, USB, or GPIO)?
What is the PSU spec (V and A)?
"Thanks for saving my life." See https://www.raspberrypi.org/forums/viewtopic.php?p=1327656#p1327656
“Raspberry Pi is a trademark of the Raspberry Pi Foundation”

cjan
Posts: 605
Joined: Sun May 06, 2012 12:00 am

Re: red light blink

Wed Jun 13, 2018 11:24 pm

davidcoton wrote:
Wed Jun 13, 2018 10:48 pm
It means the 5V power supply is going below 4.65V. Either the PSU is inadequate, or the cable from PSU to Pi is too long or thin, or something else is loosing volts along the way.

Which model Pi?
What is connected to it (anything on HDMI, USB, or GPIO)?
What is the PSU spec (V and A)?
thanks, P2b 5V 1A connect to HDMI, but its all used for 4 years until now.
had another 5.2V 1.23A, can i use?

drgeoff
Posts: 8508
Joined: Wed Jan 25, 2012 6:39 pm

Re: red light blink

Wed Jun 13, 2018 11:40 pm

cjan wrote:
Wed Jun 13, 2018 11:24 pm
davidcoton wrote:
Wed Jun 13, 2018 10:48 pm
It means the 5V power supply is going below 4.65V. Either the PSU is inadequate, or the cable from PSU to Pi is too long or thin, or something else is loosing volts along the way.

Which model Pi?
What is connected to it (anything on HDMI, USB, or GPIO)?
What is the PSU spec (V and A)?
thanks, P2b 5V 1A connect to HDMI, but its all used for 4 years until now.
had another 5.2V 1.23A, can i use?
The 5.2 volt supply will probably be OK. Not all PSUs live up to the specs implied by their labels. Furthermore, switched mode PSUs (the modern lightweight ones that run comparatively cool compared to the old heavy ones) do have a propensity to slowly fade away.

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