HDMI connects to some devices, and not to others

609 Views 4 Replies 2 Participants Last post by chrisen, Oct 2, 2019

chrisen

Discussion Starter · Sep 20, 2019

I have a frustrating problem with my HDMI connections that seems rather illogical. Some of my devices will connect to my TV ok, and some won't.

DisplayA: cheap old LCD TV branded "Andersson".
DisplayB: cheap old LCD TV (sligtly larger) branded "Finlux". I guess it's actually the same brand as Andersson, the hardware and menus etc are identical.

LaptopA: Sony Vaio
LaptopB: Asus
HTPC: Asus Eeebox
RaspberryPiA
RaspberryPiB

With displayA:
Laptop A and HTPC never had any problems, connects fine.
LaptopB and the RPis used to connect fine, but ceased to do so. The strange thing is that i bought a new RPi when the first (as I thought) stopped working, but the new one behaved like the old one. Not able to connect.

With displayB:
Exactly the same as for displayA. This TV has 2 HDMI inputs and it doesn’t matter which I use.

I’ve checked the Raspberries against other displays and then it works fine. I suppose the “faulty” laptop will work as well, although I haven’t tried.

Tried two different HDMI cables. Unplugged the devices from the mains, connected them, and then powered up again. No success.

I haven’t got a clue what to try next. It’s so strange that it used to work fine, but then stopped.

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Joe Fernand

· #2 · Sep 25, 2019

Lots of reasons why your Source to Display may not be working via HDMI.

Laptop A - try installing Monitor Asset Manager, https://www.entechtaiwan.com/util/moninfo.shtm

Laptop A > Display A - use MAM to read what info the TV is Outputting on its HDMI ports, that way you will know what the 'supported' resolution and refresh rates of the Display are and hopefully then allow you to force your Source into a supported mode.

Raspi - this may help, https://thepihut.com/blogs/raspberr...oubleshooting-a-raspberry-pi-hdmi-vga-adapter

Joe

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chrisen

Discussion Starter · #3 · Sep 29, 2019

Thanks for your help, Joe.

My Laptop A is a Linux, so MAM won't work there. Looked for any alternatives (quite sure there are some) but no luck. However, I had a testing session again with LaptopB (the faulty). That is a Win10, so I installed MAM and connected the HDMI. It's so weird, because on the laptop everything looks as it works. The connection sound is heard, the screen flickers a little when clone screen is used (tried with extended screen and display 2 solo as well), MAM and Windows register a second display. But the display shows nothing. Tried two different cables, different resolutions (I am able to set it in Windows). No luck.

I'm beginning to suspect that the HDMI port on laptopB is broken. Some pins work, some don't. Or something like that.

The report from MAM on laptopB:

Code:

Monitor #1 [Real-time 0x0031]
  Model name............... 32'' TFT-TV
  Manufacturer............. OEM
  Plug and Play ID......... OEM0000
  Serial number............ n/a
  Manufacture date......... 2007, ISO week 4
  Filter driver............ None
  -------------------------
  EDID revision............ 1.3
  Input signal type........ Digital
  Color bit depth.......... Undefined
  Display type............. RGB color
  Screen size.............. 160 x 90 mm (7,2 in)
  Power management......... Not supported
  Extension blocs.......... 1 (CEA/CTA-EXT)
  -------------------------
  DDC/CI................... Not supported

Color characteristics
  Default color space...... Non-sRGB
  Display gamma............ 2,20
  Red chromaticity......... Rx 0,643 - Ry 0,332
  Green chromaticity....... Gx 0,281 - Gy 0,598
  Blue chromaticity........ Bx 0,143 - By 0,065
  White point (default).... Wx 0,280 - Wy 0,290
  Additional descriptors... None

Timing characteristics
  Horizontal scan range.... 15-46kHz
  Vertical scan range...... 49-61Hz
  Video bandwidth.......... 80MHz
  CVT standard............. Not supported
  GTF standard............. Not supported
  Additional descriptors... None
  Preferred timing......... Yes
  Native/preferred timing.. 1920x1080i at 60Hz (16:9)
    Modeline............... "1920x1080" 74,250 1920 2008 2052 2200 1080 1084 1094 1124 interlace +hsync +vsync
  Detailed timing #1....... 1280x720p at 60Hz (16:9)
    Modeline............... "1280x720" 74,250 1280 1390 1430 1650 720 725 730 750 +hsync +vsync

Standard timings supported
     640 x  480p at  60Hz - IBM VGA

EIA/CEA/CTA-861 Information
  Revision number.......... 3
  IT underscan............. Not supported
  Basic audio.............. Supported
  YCbCr 4:4:4.............. Supported
  YCbCr 4:2:2.............. Supported
  Native formats........... 1
  Detailed timing #1....... 720x480p at 60Hz (4:3)
    Modeline............... "720x480" 27,000 720 736 798 858 480 489 495 525 -hsync -vsync
  Detailed timing #2....... 1440x480i at 60Hz (4:3)
    Modeline............... "1440x480" 27,000 1440 1478 1602 1716 480 488 494 524 interlace -hsync -vsync
  Detailed timing #3....... 1920x1080i at 50Hz (16:9)
    Modeline............... "1920x1080" 74,250 1920 2448 2492 2640 1080 1084 1094 1124 interlace +hsync +vsync
  Detailed timing #4....... 1280x720p at 50Hz (16:9)
    Modeline............... "1280x720" 74,250 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
  Detailed timing #5....... 720x576p at 50Hz (4:3)
    Modeline............... "720x576" 27,000 720 732 796 864 576 581 586 625 -hsync -vsync

CE video identifiers (VICs) - timing/formats supported
     640 x  480p at  60Hz - Default (4:3, 1:1)
     720 x  480p at  60Hz - EDTV (4:3, 8:9)
    1280 x  720p at  60Hz - HDTV (16:9, 1:1)
    1920 x 1080i at  60Hz - HDTV (16:9, 1:1) [Native]
     720 x  480i at  60Hz - Doublescan (4:3, 8:9)
     720 x  576p at  50Hz - EDTV (4:3, 16:15)
    1280 x  720p at  50Hz - HDTV (16:9, 1:1)
    1920 x 1080i at  50Hz - HDTV (16:9, 1:1)
     720 x  576i at  50Hz - Doublescan (4:3, 16:15)
    NB: NTSC refresh rate = (Hz*1000)/1001

CE audio data (formats supported)
  LPCM    2-channel, 16-bit              at 32/44/48 kHz

CE speaker allocation data
  Channel configuration.... 2.0
  Front left/right......... Yes
  Front LFE................ No
  Front center............. No
  Rear left/right.......... No
  Rear center.............. No
  Front left/right center.. No
  Rear left/right center... No
  Rear LFE................. No

CE vendor specific data (VSDB)
  IEEE registration number. 0x000C03
  CEC physical address..... 1.0.0.0
  Maximum TMDS clock....... 165MHz

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Joe Fernand

· #4 · Sep 30, 2019

The Display does report 'DDC/CI - not supprted' - is there an option in the Display setup menu to enable DDC?

Joe

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chrisen

Discussion Starter · #5 · Oct 2, 2019

No, I'm afraid not. The settings on the tv are on a very basic level. Perhaps it's a hot-plugging issue. I'll test one more time this weekend with the HDMI connected from absolute startup.

/Chris

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