scollins15
Posts: 15
Joined: Fri Aug 30, 2013 3:12 pm

Pi 3 HDMI output flickers on and off during boot

Thu Apr 21, 2016 1:14 pm

Hello all,

I have Pi 3's (5), running kernel 4.4.7-v7+, during boot after the logo the screen will flicker on and off. I can tell this because my display post a no signal detected logo temporarily a few times after the logo. Is there a way to force HDMI output to stay on during boot. I have tried to manually set the HDMI modes, group, etc... in the CONFIG.TXT file with the same results.

This was not a problem with the Raspberry Pi B+ or sooner releases.

Any suggestions as always are greatly appreciated.

Scot

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cresfang
Posts: 37
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Location: Garden of Time
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Re: Pi 3 HDMI output flickers on and off during boot

Mon Jul 25, 2016 1:32 am

----deleted----
Last edited by cresfang on Tue Jul 26, 2016 8:58 am, edited 1 time in total.
Raspberry Pi 3

RAZERZ
Posts: 57
Joined: Mon Jun 13, 2016 4:56 pm

Re: Pi 3 HDMI output flickers on and off during boot

Mon Jul 25, 2016 11:19 am

Since you know about the config.txt, this should go smoothly (hopefully).
Open a terminal window and type;

Code: Select all

sudo nano /boot/config.txt
Then, using your arrows on the keyboard, find;
#config_hdmi_boost=4
Uncomment it so it looks like this;
config_hdmi_boost=4
This will increase the signal and you can change the value to something that fits your screen best, I have a VGA to HDMI and it requires the number 8.

Hope that helped and good luck! :D
Raspberry pi 3 set up as desktop with raspbian.
I guess you can say I am not newbie with linux but I am not a master at it either.
I will always try to help you as much as I can because I know how hard it is to run into problems :D

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cresfang
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Location: Garden of Time
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Re: Pi 3 HDMI output flickers on and off during boot

Tue Jul 26, 2016 1:49 am

Sorry for hijacking.
I just think the issue is the same as mine.
Last edited by cresfang on Tue Jul 26, 2016 8:57 am, edited 1 time in total.
Raspberry Pi 3

SonOfAMotherlessGoat
Posts: 690
Joined: Tue Jun 16, 2015 6:01 am

Re: Pi 3 HDMI output flickers on and off during boot

Tue Jul 26, 2016 3:15 am

cresfang wrote:I put 7 actually...
Read my config.txt, I already had that inserted...
This is what happens when you hijack someone else's thread. We don't get the entire picture and chasing links to find out the story is droll.

Moving over to that thread to continue the troubleshooting.
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