HDMI turns off after few seconds

[LukasSliacky]

Hi guys,

i have big problem with my Raspberry. I tried search on forum, i tried google, but i don't find solution (maybe don't exist) :/

When i plug power to my Raspi, few seconds i see "boot informations", but after maybe 6-7 seconds is monitor turned off and this is end of any actions (monitor don't have a signal and his try swich between HDMI and Analog input).

I tried boot with "NOOBS loader": After plug in power i see interface with selection actions (install Raspbian, ...), but maybe after 5-6 second, is monitor turned off and i see same scenario like a first case :/

Video: https://www.dropbox.com/s/yczs69ox57iq2 ... 5.mp4?dl=0

I tried edit config.txt and currently is:

Code: Select all

# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

A lot of times, my raspi doesn't any actions after plug in power. Lights only red LED and display isn't turned on :/

(Raspberry Pi model B; Power 5V / 1A)

Any ideas? Or is my Raspi half dead?

Really thanks for any answers.

[hansotten]

Looks like the familiar insufficient power supply.

Try another.

[LukasSliacky]

Thanks for answer.
Hmm, i tried 3 adapters (but all from HTC) and 2 differents cables (1 x No name, 1x Nokia).
Maybe i will try Samsung, but then don't have here...

[mahjongg]

two thoughts:

Try increasing HDMI drive strength, using config.txt. But config.txt has no influence, as it isn't used by NOOBS.

Try pressing the '2' key when in NOOBS, to with to switch to safe HDMI mode from optimal HDMI mode.

[beta-tester]

But config.txt has no influence, as it isn't used by NOOBS.

hmmm, that's not fully true. my official NOOBS 1.3.10 is using the config.txt, if i put one to its partition... and it was already this case before NOOBS 1.3.10.
for example i use the config.txt to adjust the overscan - without, NOOBS shows a very very big overscan on my monitor, with my created config.txt and the right options, NOOBS shows an adjusted over-scan. i also put over-clock options there, to speed up the installation process - but there i am not sure, if NOOBS are using these settings, i have no reference without.

PS.: normally the NOOBS partition is not "shipped" with an config.txt file, but you can create/put one to there and NOOBS is using it (maybe only partially, but it works).

PPS.: the config.txt on the NOOBS partition, will only adjust NOOBS itself, as long it is active.
as soon you load an operating system it will use its own config.txt file of its own boot partition.

[beta-tester]

try to use also the hdmi signal boost option in your config.txtfile

Code: Select all

# uncomment to increase signal to HDMI, if you have interference, blanking, or no display
config_hdmi_boost=4

[LukasSliacky]

Hi guys,
thanks for your answers:
I tried maybe 5 power supplies from HTC (5V; 1A), 1x Samsung (5V; 0,7A) 1x Samsung (5V; 1A) - with this adaptateur worked my Raspi without problems...

I tried change config to:

Code: Select all

config_hdmi_boost=4

but problem still takes :/

IMHO this issue isn't relate power supply and solutions isn't in configuration file.
Maybe is a hardware problem?

[mahjongg]

But config.txt has no influence, as it isn't used by NOOBS.

hmmm, that's not fully true. my official NOOBS 1.3.10 is using the config.txt, if i put one to its partition... and it was already this case before NOOBS 1.3.10.
for example i use the config.txt to adjust the overscan - without, NOOBS shows a very very big overscan on my monitor, with my created config.txt and the right options, NOOBS shows an adjusted over-scan. i also put over-clock options there, to speed up the installation process - but there i am not sure, if NOOBS are using these settings, i have no reference without.

PS.: normally the NOOBS partition is not "shipped" with an config.txt file, but you can create/put one to there and NOOBS is using it (maybe only partially, but it works).

PPS.: the config.txt on the NOOBS partition, will only adjust NOOBS itself, as long it is active.
as soon you load an operating system it will use its own config.txt file of its own boot partition.

Thanks for the info...

[beta-tester]

IMHO this issue isn't relate power supply and solutions isn't in configuration file.
Maybe is a hardware problem?

did you tried an other SD card already?
and an other monitor / HDMI TV / AV output?
and HDMI cable?

otherwise i have no ideas furthermore...

EDIT: do you have a network cable that you can connect to your RPi and a network switch/router? then try to boot your RPi with the plugged networkcable... then you will see the LEDs (green/yellow/...) tuns on.
if the LEDs turns off and stay off, then you know that NOT the configuration is the problem... then your power or SD card is the it.

[paulie]

EDIT: do you have a network cable that you can connect to your RPi and a network switch/router? then try to boot your RPi with the plugged networkcable... then you will see the LEDs (green/yellow/...) tuns on.
if the LEDs turns off and stay off, then you know that NOT the configuration is the problem... then your power or SD card is the it.

If you think your Pi has booted successfully, but still has no HDMI output, can you connect using SSH using the Pi's IP address?
That will show it is up and running, and you have a display problem...
I had the same symptoms, but that was from installing fb driver for Adafruit tft screen

[LukasSliacky]

Hi all,
sorry for late response.

Hm, genesis of my problem:
I have Raspi with Samsung power supply 5V / 1A. Maybe 6 months worked all fine, i was connect to him via TightVNC. TightVNC works reliably, sometimes restart, all was fine...
After this time has raspi turn off and i don't use him maybe 2-3 week. When i turned on and tried connect to him via TightVNC, raspi not respond.

I tried every combination of power supply (my posts in top), combinations of monitors (Samsung, Acer) and variations in config.txt (

Code: Select all

hdmi_safe=1
hdmi_force_hotplug=1
config_hdmi_boost=4

Raspi is now very abnormally:
When i connect power supply, 60% lit only red LED and minitor is turned off.
Maybe 30% of turns on, lit red LED and blink green led, but monitor is still inactive.
Maybe 10% of turns on, red LED is on, monitor works maybe 5-6-7 seconds, but after this time shows No Signal info.

ONLY ONE TIME from cca 50 tests Raspbian boot normally to GUI and works without problems. After restart was situations same :/

I tested only one SD Card (more i don't have :/ )

When i format the card and boot NOOBS loader, every time monitor was works fine maybe 5-6-7 seconds, but after this time shown No signal message.
I turn on raspi, wait with no interactions, NOOBS show options to install Raspbian and after few second is monitor without signal.

Really i don't know, where is problem...

I think only two opinions:
1. SD Card (probably not)
2. Raspi is broken (maybe dead)

(sorry for my english, isn't my nature language)

[DougieLawson]

Start by swapping out the power supply for one that works.

[RaTTuS]

it may be the SD card is bent and not making proper contact

[LukasSliacky]

hi guys,

maybe i have a new information for my problem.
I tried 2,1A Power Supply and scenario is same, like my previous posts :/

But i tried other SD card (4GB) and boot was "freeze" on this screen: