HDMI Cable problem

Alanmoss · 21-08-2011, 16:42

Hi, I recently decorated my bedroom and ran a HDMI cable up the wall and plastered over it. It does not work from my dvd player to my samsung flat screen I fitted on the wall. I thought that I may have damaged it while decorating, but after doing a continuity test I find no fault.

I have tried a different cable with the same two devices and it works. So how can i have a fault with my cable when faults find with continuity test and no cross over connections found either.

Have i bought the wrong type of HDMI cable or is there another test I can do to the cable to be sure, or another work around because I don't want to ruin all the hard work. Any help will be much appreciated.

Stephen · 21-08-2011, 17:22

Not sure of the issue but you couldn't have bought the wrong type of HDMI.

arcimedes · 21-08-2011, 17:26

Silly question but did you test it before you attached it to the wall? I presume a continuity test will work even if two wires in the cable are touching.

Alanmoss · 21-08-2011, 17:54

Yes a continuity test will work on a wire if 2 are touching but i also check for continuity in all the wires while testing one, which showed no continuity.

thenry · 21-08-2011, 17:58

Theres your answer then mate, wire needs replacing.

Alanmoss · 21-08-2011, 18:03

No, Because if you test between pin 1 and pin 1 and get continuity then test 1-2 , 1-3 , 1-4 and so on and get no continuity then the wire on pin 1 has no fault. Then carry out the same test on all the other wires, no faults found.

Scrubbs · 21-08-2011, 19:05

It is possible your cable has higher resistance than the one's you have tested the devices on.
if you measure the resistance on the cable that works and then compare it to your suspect one you might have a better idea. come back and tell us how you get on

Alanmoss · 24-08-2011, 20:31

The cable that works 1m long and has a resistance of 0.4 ohms and the one in the wall is 5m long and has a resistance 10 ohms, I dont know whether the increase in resistance due to the longer length or the problem? Any ideas.

Scrubbs · 25-08-2011, 00:29

the only thing I can recommend is go to maplins and ask what the resistance is of one of their hdmi cables, they probably don't know but it's possible they will measure one for you.
but either way it looks like that 10m one in the wall isn't going to work

raging bull · 25-08-2011, 05:22

Given that 1metre equates to 0.4 ohms, I would have thought 5 times that length would be 2.0 ohms.

TheDon · 25-08-2011, 13:35

This is a lesson in why you should run cable in conduit rather than just buried straight into the wall. That way any cable issues just need a repull rather than having to replaster your wall again afterwards.

---------- Post added at 14:35 ---------- Previous post was at 14:08 ----------

Quote:

Originally Posted by Alanmoss

The cable that works 1m long and has a resistance of 0.4 ohms and the one in the wall is 5m long and has a resistance 10 ohms, I dont know whether the increase in resistance due to the longer length or the problem? Any ideas.

The smallest cables used in hdmi are generally 28 gauge, which over 5m should offer a resistance of around 1 ohm.

Your cable is likely damaged in some way.

Could very well be overheating due to being buried in the wall with no air around it (another benefit of using conduit)

Scrubbs · 22-01-2012, 16:50

Isn't it loverly when some one comes back and says " yes, that worked , Thanks"

SMG · 23-01-2012, 00:21

I`m quite thick when it comes to testing resistances etc, so, to me, if cable 1 doesn't work, & cable 2 does, then its not rocket science & it doesn't really matter whats wrong. Change the cable.

When my son fitted his screen on the wall, he fitted a plastic tube in the wall so he could pass a cable through.