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Raspberry Pi Forum no boot when hdmi connect
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Forum Thread Details
  • State Verified Answer
  • Replies 12 replies
  • Answers 1 answer
  • Subscribers 708 subscribers
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  • raspberrypi.
  • hdmi
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Related

no boot when hdmi connect

e14 Contributor
e14 Contributor over 10 years ago

Hello to all,

 

my first own raspberry 2 (raspbian jessy) does not reliable boot when switched on power.

 

I tracked the problem down and figured out that booting with hdmi connected will fail very often.

 

Is this behavior known?

Or rather an effect on my monitor?

 

Is there a way to fix it?

 

Best Regards

 

Stefan

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  • Problemchild
    0 Problemchild over 10 years ago

    Stefan, as already alluded to the problem most probably lies with the implementation of CEC  failing this it's the power from the HDMI partially powering the RPI  which leaves it in an undefined state which can't be recovered from. Unfortunately that's merely acknowledging that this problem exists, if you have a VGA input on that Syncmaster you can use a HDMI-VGA adaptor to get you out of that problem. In the UK they are around £6 and worth a try.

     

    John

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  • rew
    0 rew over 10 years ago in reply to Problemchild

    back when we had a schematic of the 'pi, there was a diode to prevent the pi getting power from the HDMI-5V.

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  • Problemchild
    0 Problemchild over 10 years ago in reply to rew

    Still plenty of scope for the CEC to screw things up ... using an HDMI to VGA adaptor was just a bodge to get break the HDMI/DVI connection and just get plain video

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  • Problemchild
    0 Problemchild over 10 years ago in reply to rew

    Still plenty of scope for the CEC to screw things up ... using an HDMI to VGA adaptor was just a bodge to get break the HDMI/DVI connection and just get plain video

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  • rew
    0 rew over 10 years ago in reply to Problemchild

    Speaking of which. CEC is as far as I know a HDMI thingy. The CEC if even available, will be "broken" by the DVI adapter as well. I was suspecting problems with the i2c-like signals between the graphics "card" and the monitor (I forget at the moment what they are called.. [UPDATE: "EDID"]). These have existed since VGA, and as far as I know, the PI will interrogate the real monitor even when a VGA- or DVI adapter is used.

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