Problems with VGA lead and HDMI lead ......

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Moonbeam
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Joined: Sat Dec 08, 2007 5:28 pm UTC
Location: UK

Problems with VGA lead and HDMI lead ......

Postby Moonbeam » Sun Nov 15, 2015 8:04 pm UTC

Okay, here's the deal;

Problem 1:

I've recently installed a home CCTV system and connected the DVR to a laptop monitor, using a VGA lead (15 pin) - no problem :)
Tried connecting it to my Panasonic TV, by plugging it into the PC input on the TV - no problem :)
Tried connecting it to my Samsung TV, by plugging it into the PC input on the TV- nothing.
I clicked through the source list and PC is greyed out - it's as if it's not connected as it's not registering it .... and yea I tried messing with the connections.
Well, a friend suggested trying another lead ..... why this would work is beyond me, as the lead is obviously fine, as it worked when connected to the monitor and Panasonic TV .... but WTF - it worked .... what gives ?? Why would the lead that worked on the other 2, not work on the Samsung ??
Any ideas ??

Problem 2:

Tried connecting the DVR to the Panasonic TV using a HDMI lead - nothing ... it doesn't register it.
Tried connecting it to the Samsung TV and I get the error, "mode not supported". A quick google suggested that the output resolution of the DVR was too high for the TV, so I set the resolution on the DVR to the minimum - no joy, still the same error.

Can anyone throw any light on any of these issues please ??

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Jorpho
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Joined: Wed Dec 12, 2007 5:31 am UTC
Location: Canada

Re: Problems with VGA lead and HDMI lead ......

Postby Jorpho » Wed Nov 18, 2015 1:39 am UTC

Moonbeam wrote:Well, a friend suggested trying another lead ..... why this would work is beyond me, as the lead is obviously fine, as it worked when connected to the monitor and Panasonic TV .... but WTF - it worked .... what gives ?? Why would the lead that worked on the other 2, not work on the Samsung ??
Any ideas ??
It seems entirely reasonable that VGA cables might be poorly standardized, and that some devices would be more tolerant than others when it comes to cables being slightly out of spec. (Resistance across particular sets of pins would be the major factor, I think.)

Problem 2:

Tried connecting the DVR to the Panasonic TV using a HDMI lead - nothing ... it doesn't register it.
Tried connecting it to the Samsung TV and I get the error, "mode not supported". A quick google suggested that the output resolution of the DVR was too high for the TV, so I set the resolution on the DVR to the minimum - no joy, still the same error.

Can anyone throw any light on any of these issues please ??
Try a different HDMI cable? There have been different revisions of the HDMI standard and some cables might have capabilities that others lack – HDCP springs to mind.

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Moonbeam
Posts: 292
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Location: UK

Re: Problems with VGA lead and HDMI lead ......

Postby Moonbeam » Wed Nov 18, 2015 8:19 am UTC

Thanks for the reply - sorted now anyway.

I needed a lead approx 4 - 5 metres in length. The "dodgy" lead was 5m, but the "good" lead was only 1.5m.
I've just bought a new VGA lead and everything works okay now :)

I guess I'll never really know why this has happened, but I like your explanation so that's good enough for me :) :)

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Jorpho
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Joined: Wed Dec 12, 2007 5:31 am UTC
Location: Canada

Re: Problems with VGA lead and HDMI lead ......

Postby Jorpho » Wed Nov 18, 2015 2:54 pm UTC

Moonbeam wrote:I needed a lead approx 4 - 5 metres in length. The "dodgy" lead was 5m, but the "good" lead was only 1.5m.
I've just bought a new VGA lead and everything works okay now :)
I've worked with unusually long VGA cables in the past. Windows often loses the ability to auto-detect the monitor type – I suppose the DDC communication degrades.


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