chriswilson
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VGA adaptor question

Thu Oct 03, 2019 2:03 pm

I want to dedicate an oldish VGA input only monitor to my RP3 B+ Can I use a simple HDMI to VGA converter or must it be a more expensive "active" one please? Thanks! For now I am hoping to boot it for the fisrt time with another monitor that has a DVI socket as well as a VGA one using a simple HDMI to DVI cable, should that work?

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FTrevorGowen
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Re: VGA adaptor question

Thu Oct 03, 2019 3:14 pm

chriswilson wrote: I want to dedicate an oldish VGA input only monitor to my RP3 B+ Can I use a simple HDMI to VGA converter or must it be a more expensive "active" one please? Thanks! For now I am hoping to boot it for the fisrt time with another monitor that has a DVI socket as well as a VGA one using a simple HDMI to DVI cable, should that work?
A "simple" HDMI to VGA converter (cable) will not work an active adapter is needed (which may need to be powered)**. The HDMI to DVI cable should work fine with the other monitor.
Trev.
** FWIW, here are some examples I've used:
http://www.cpmspectrepi.uk/raspberry_pi ... erter.html
http://www.cpmspectrepi.uk/raspberry_pi ... rter2.html
or the GPIO-based method:
http://www.cpmspectrepi.uk/raspberry_pi ... apter.html
http://www.cpmspectrepi.uk/raspberry_pi ... dV2p0.html
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, B2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, A+ and a B2) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

plugwash
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Re: VGA adaptor question

Thu Oct 03, 2019 3:27 pm

HDMI to VGA conversion requires active circuitry, there are apparently some dodgy Chinese sellers out there selling straight cables with a HDMI plug on one end and a VGA plug on the other, these will not work with the vast majority of devices (if any at all).

Some active converters are also apparently problematic due to drawing too much power from the HDMI port.

Personally when I have needed to connect VGA monitors to the Pi I have used the "piview" from element14 (farnell group), https://cpc.farnell.com/element14/pivie ... w%2Fsearch I have found it works fine with modern VGA monitors, but I do have vauge recollections of problems using it with an old CRT.

chriswilson
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Joined: Thu Oct 03, 2019 1:58 pm

Re: VGA adaptor question

Thu Oct 03, 2019 9:02 pm

Thank you very much for the advice, the Pi runs fine on my monitor with DVI support, and I have ordered an active VGA converter for future use with old monitors, much appreciated.

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