simonplackett
Posts: 2
Joined: Fri Aug 16, 2019 5:53 pm

RPI 4B will not display anything on HDMI screen

Fri Aug 16, 2019 6:13 pm

Hi,

I have just decided to upgrade to RPI 4B - I have a couple - and I have tried all sorts of combinations on both.

With much changing single parameters in /boot/config.txt

WITH
hdmi_group=1
hdmi_mode=1

I get the four raspberries at the top of the screen, confirmation of the std VGA message, a quick flash of a welcome type screen (I think) and then the screen goes blank and say no signal detected.

I have checked the manufacturers datasheets and the screen fits DMT 81 - and by using

tvservice -l
1 attached device(s), display ID's are :
Display Number 2, type HDMI 0

AND
tvservice -s -v 2
state 0xa [HDMI CUSTOM RGB full 16:9], 1366x768 @ 59.00Hz, progressive

It looks compatible - however the screen resolutely remains blank -

I have tried boosting the signal up to 11 with
config_hdmi_boost

I have also tried
hdmi_safe=1

and also
hdmi_force_mode=1

As I say, the best I can achieve is the 4 raspberries and the flash of the welcome screen.

Does anyone have any ideas please

For completeness

1) I have tried HDMI cables with adapters and also a cable that goes directly from micro to hdmi
2) I have tried on 3 separate 4Bs all do the same thing
3) I have tried all three buster builds lite, desktop, desktop+ with no luck
4) As I can;t get the screen up noobs is non-starter (I am pretty convinced the noobs boot worked - but since there is no screen and no ssh I could not confirm)
5) I have tried all of the above in both HDMI0 and HDMI1

I have updated and upgraded the pi's and one of them I risked a kernel update. Nothing enables the HDMI screen to come alive.

There are no obvious errors in syslog or dmesg, and I am pasting the output from
/opt/vc/bin/tvservice -d edid.dat; /opt/vc/bin/edidparser edid.dat

Written 256 bytes to edid.dat
Enabling fuzzy format match...
Parsing edid.dat...
HDMI:EDID version 1.3, 1 extensions, screen size 41x23 cm
HDMI:EDID features - videodef 0x80 !standby !suspend !active off; colour encoding:RGB444|YCbCr422; sRGB is not default colourspace; preferred format is native; does not support GTF
HDMI:EDID found monitor range descriptor tag 0xfd
HDMI:EDID monitor range offsets: V min=0, V max=0, H min=0, H max=0
HDMI:EDID monitor range: vertical is 24-75 Hz, horizontal is 15-68 kHz, max pixel clock is 230 MHz
HDMI:EDID monitor range does not support GTF
HDMI:EDID found monitor name descriptor tag 0xfc
HDMI:EDID monitor name is T19C300
HDMI:EDID found preferred DMT detail timing format: 1366x768p @ 60 Hz (81)
HDMI:EDID found CEA detail timing format: 1280x720p @ 60 Hz (4)
HDMI:EDID established timing I/II bytes are BD EE 00
HDMI:EDID found DMT format: code 4, 640x480p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 5, 640x480p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 6, 640x480p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 9, 800x600p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 10, 800x600p @ 72 Hz in established timing I/II
HDMI:EDID found DMT format: code 11, 800x600p @ 75 Hz in established timing I/II
HDMI:EDID found DMT format: code 16, 1024x768p @ 60 Hz in established timing I/II
HDMI:EDID found DMT format: code 17, 1024x768p @ 70 Hz in established timing I/II
HDMI:EDID found DMT format: code 18, 1024x768p @ 75 Hz in established timing I/II
HDMI:EDID standard timings block x 8: 0x81C0 0101 0101 0101 0101 0101 0101 0101
HDMI:EDID found DMT format: code 85, 1280x720p @ 60 Hz (16:9) in standard timing 0
HDMI:EDID parsing v3 CEA extension 0
HDMI:EDID monitor support - underscan IT formats:yes, basic audio:yes, yuv444:yes, yuv422:yes, #native DTD:1
HDMI:EDID found CEA detail timing format: 1280x720p @ 50 Hz (19)
HDMI:EDID found CEA detail timing format: 1920x1080i @ 60 Hz (5)
HDMI:EDID found CEA detail timing format: 1920x1080i @ 50 Hz (20)
HDMI:EDID found CEA detail timing format: 720x480p @ 60 Hz (2)
HDMI:EDID found CEA format: code 4, 1280x720p @ 60Hz (native)
HDMI:EDID found CEA format: code 19, 1280x720p @ 50Hz
HDMI:EDID found CEA format: code 5, 1920x1080i @ 60Hz
HDMI:EDID found CEA format: code 20, 1920x1080i @ 50Hz
HDMI:EDID found CEA format: code 3, 720x480p @ 60Hz
HDMI:EDID found CEA format: code 18, 720x576p @ 50Hz
HDMI:EDID found CEA format: code 16, 1920x1080p @ 60Hz
HDMI:EDID found CEA format: code 31, 1920x1080p @ 50Hz
HDMI:EDID found CEA format: code 32, 1920x1080p @ 24Hz
HDMI:EDID found CEA format: code 33, 1920x1080p @ 25Hz
HDMI:EDID found CEA format: code 34, 1920x1080p @ 30Hz
HDMI:EDID found CEA format: code 7, 1440x480i @ 60Hz
HDMI:EDID found CEA format: code 22, 1440x576i @ 50Hz
HDMI:EDID found audio format 2 channels PCM, sample rate: 32|44|48 kHz, sample size: 16|20|24 bits
HDMI:EDID found Video Capability DB length 2
HDMI:EDID video capability: CE:3 IT:3 PT:0 QS:0
HDMI:EDID found HDMI VSDB length 7
HDMI:EDID HDMI VSDB has physical address 1.0.0.0
HDMI:EDID HDMI VSDB supports AI:yes, dual link DVI:no
HDMI:EDID HDMI VSDB deep colour support - 48-bit:no 36-bit:yes 30-bit:yes DC_yuv444:yes
HDMI:EDID HDMI VSDB max TMDS clock 225 MHz
HDMI:EDID HDMI VSDB has no latency information
HDMI:EDID adding mandatory support for CEA (1) 640x480p @ 60Hz
HDMI:EDID adding mandatory support for CEA (17) 720x576p @ 50Hz
HDMI:EDID filtering formats with pixel clock unlimited MHz or h. blanking unlimited
HDMI:EDID best score mode initialised to DMT (4) 640x480p @ 60 Hz with pixel clock 25 MHz (score 0)
HDMI:EDID best score mode is now CEA (1) 640x480p @ 60 Hz with pixel clock 25 MHz (score 43432)
HDMI:EDID best score mode is now CEA (2) 720x480p @ 60 Hz with pixel clock 27 MHz (score 2545736)
HDMI:EDID CEA mode (3) 720x480p @ 60 Hz with pixel clock 27 MHz has a score of 45736
HDMI:EDID best score mode is now CEA (4) 1280x720p @ 60 Hz with pixel clock 74 MHz (score 4607944)
HDMI:EDID DMT mode (4) 640x480p @ 60 Hz with pixel clock 25 MHz has a score of 36864
HDMI:EDID CEA mode (5) 1920x1080i @ 60 Hz with pixel clock 74 MHz has a score of 3649416
HDMI:EDID DMT mode (5) 640x480p @ 72 Hz with pixel clock 31 MHz has a score of 11059
HDMI:EDID DMT mode (6) 640x480p @ 75 Hz with pixel clock 31 MHz has a score of 11520
HDMI:EDID CEA mode (7) 1440x480i @ 60 Hz with pixel clock 27 MHz has a score of 35368
HDMI:EDID DMT mode (9) 800x600p @ 60 Hz with pixel clock 40 MHz has a score of 57600
HDMI:EDID DMT mode (10) 800x600p @ 72 Hz with pixel clock 50 MHz has a score of 17280
HDMI:EDID DMT mode (11) 800x600p @ 75 Hz with pixel clock 49 MHz has a score of 18000
HDMI:EDID CEA mode (16) 1920x1080p @ 60 Hz with pixel clock 148 MHz has a score of 149416
HDMI:EDID DMT mode (16) 1024x768p @ 60 Hz with pixel clock 65 MHz has a score of 94370
HDMI:EDID CEA mode (17) 720x576p @ 50 Hz with pixel clock 27 MHz has a score of 45736
HDMI:EDID DMT mode (17) 1024x768p @ 70 Hz with pixel clock 75 MHz has a score of 27525
HDMI:EDID CEA mode (18) 720x576p @ 50 Hz with pixel clock 27 MHz has a score of 45736
HDMI:EDID DMT mode (18) 1024x768p @ 75 Hz with pixel clock 78 MHz has a score of 29491
HDMI:EDID CEA mode (19) 1280x720p @ 50 Hz with pixel clock 74 MHz has a score of 4071080
HDMI:EDID CEA mode (20) 1920x1080i @ 50 Hz with pixel clock 74 MHz has a score of 3128680
HDMI:EDID CEA mode (22) 1440x576i @ 50 Hz with pixel clock 27 MHz has a score of 35368
HDMI:EDID CEA mode (31) 1920x1080p @ 50 Hz with pixel clock 148 MHz has a score of 128680
HDMI:EDID CEA mode (32) 1920x1080p @ 24 Hz with pixel clock 74 MHz has a score of 74766
HDMI:EDID CEA mode (33) 1920x1080p @ 25 Hz with pixel clock 74 MHz has a score of 76840
HDMI:EDID CEA mode (34) 1920x1080p @ 30 Hz with pixel clock 74 MHz has a score of 87208
HDMI:EDID best score mode is now DMT (81) 1366x768p @ 60 Hz with pixel clock 85 MHz (score 5188835)
HDMI:EDID DMT mode (85) 1280x720p @ 60 Hz with pixel clock 74 MHz has a score of 135592
HDMI0:EDID preferred mode remained as DMT (81) 1366x768p @ 60 Hz with pixel clock 85 MHz
HDMI:EDID has HDMI support and audio support
/opt/vc/bin/edidparser exited with code 0

If anyone can help I would be very grateful :) :)

Thanks
Simon

pcmanbob
Posts: 7140
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: RPI 4B will not display anything on HDMI screen

Sat Aug 17, 2019 11:07 am

Hi.
Display Number 2, type HDMI 0
So which HDMI socket do you have the display plugged in to ?

if you are only using a single display you should be using the HDMI socket closest to the USB "C" power socket.
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HawaiianPi
Posts: 4777
Joined: Mon Apr 08, 2013 4:53 am
Location: Aloha, Oregon USA

Re: RPI 4B will not display anything on HDMI screen

Sat Aug 17, 2019 11:35 am

Is it a television or monitor?

For a monitor, try the following in config.txt

hdmi_force_hotplug=1
hdmi_ignore_edid=0xa5000080
hdmi_group=2
hdmi_mode=81

And if that doesn't work you could try mode 86 or 39.

If it's a television, try group 1, mode 4 (720p60).
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simonplackett
Posts: 2
Joined: Fri Aug 16, 2019 5:53 pm

Re: RPI 4B will not display anything on HDMI screen

Sat Aug 17, 2019 4:50 pm

Hi - screen is now working:

I ended up with:

hdmi_force_mode=1
hdmi_group=2
hdmi_mode=81
hdmi_drive=1
config_hdmi_boost=2

The significant change was forcing the display into hdmi_drive=1 aka a DVI display.

Thank-you again for the help :) :)

Simon

andrum99
Posts: 856
Joined: Fri Jul 20, 2012 2:41 pm

Re: RPI 4B will not display anything on HDMI screen

Sun Aug 18, 2019 12:36 am

simonplackett wrote:
Sat Aug 17, 2019 4:50 pm
Hi - screen is now working:

I ended up with:

hdmi_force_mode=1
hdmi_group=2
hdmi_mode=81
hdmi_drive=1
config_hdmi_boost=2

The significant change was forcing the display into hdmi_drive=1 aka a DVI display.

Thank-you again for the help :) :)

Simon
Interesting. I was under the impression config_hdmi_boost was not yet implemented on the Pi 4.

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