TV flickers on power fluctuations

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Richard_100

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Feb 8, 2016
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Hi I'm having this extremely annoying problem with my LG TV, I bought a 10m HDMI cable off of Amazon recently (http://www.amazon.co.uk/IBRA%C2%AE-PRO-GOLD-Version-18Gbps-Red/dp/B0036BHCSS/) and the reviews are all excellent for it, and the cable itself seems to be very well built. My problem is that when connecting it between my laptop and the TV (and in fact any HDMI source and any TV) , it will show picture and everything perfectly fine for a while, but every now and then it will flicker, the screen will go back for a second and the audio will go, then the video comes back and the audio a second later, like nothing happened.

I've narrowed it down to it happening whenever there's some sort of change in load on the circuit, eg I turn a light on or off and so on. Does anyone know how I could fix this? I have tried a different TV, it still happens, I've tried a HDMI booster (http://www.amazon.co.uk/gp/product/B015DOFD3G) and that just meant no signal got through at all.

Any help would be greatly appreciated.

Thanks,
Rich
 
Solution
Solandri

Ah, that's easy then. HDMI has 19 wires, so each individual wire is really thin. That increases the signal loss with distance. On longer cables like 10m, the usual solution is to use thicker wires to reduce signal loss. Unfortunately that makes the cable thicker and stiffer, and some unscrupulous sellers take advantage of this to sell thinner cables even though it'll have problems carrying the HDMI signal that entire distance. If the signal strength...
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Ralston18

Ralston18

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Oct 11, 2014
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Probably too much load on the circuit: how many devices are there?

Might be able to reduce the load via energy saving light bulbs in table lamps.

Overall, you will probably need an electrician to look at your overall wiring, outlets, and switches. Maybe run a new circuit somewhere or otherwise change the loads.
 
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Richard_100

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Feb 8, 2016
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I'm not sure if it's actually as awful of a problem as made out to be, I neglected to mention it in my original post but it works completely fine with a normal length HDMI cable (~2m cable) with no problems at all, something as serious as that not also cause a problem then too?


 
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CelicaGT

CelicaGT

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Jul 22, 2013
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Hmmm, if that's the case then maybe some RF interference? Is it a decent quality cable? Longer runs will need better shielding. And no, I do not support the purchase of ludicrously priced cables.
 
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Richard_100

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Feb 8, 2016
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I'm glad you don't haha, well if you look at the link for the Amazon page it shows lots of verified purchase reviews with people saying it works excellently for them, so I presume it's something about my particular situation? The majority of the cable run is away from anything electrical, even from the walls, just obviously when it get's close to my laptop there's the cabling for speakers etc,

 
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Solandri

Solandri

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Jan 4, 2012
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Ah, that's easy then. HDMI has 19 wires, so each individual wire is really thin. That increases the signal loss with distance. On longer cables like 10m, the usual solution is to use thicker wires to reduce signal loss. Unfortunately that makes the cable thicker and stiffer, and some unscrupulous sellers take advantage of this to sell thinner cables even though it'll have problems carrying the HDMI signal that entire distance. If the signal strength drops below the level the TV can detect it, it'll drop out.

Fortunately, there is a solution. Look for something called a Redmere HDMI cable. The HDMI spec limits the power of the HDMI signal. Redmere cables steal a little power from the TV 's HDMI port, transmit it back to the source video port, and use it to boost the power of the HDMI signal. That is, it transmits the HDMI signal over the cable at a higher power than the HDMI spec allows, thus reducing signal loss. At the TV end, it lowers the signal strength back to within HDMI spec. The end result is that Redmere cables can transmit HDMI over longer distances without having to be as thick as regular HDMI cables. The only catch is the cables are not reversible - they are designed to carry signals only in one direction. The side marked TV must be plugged into the TV (or receiver). The side marked Source must be plugged into the video source.

http://www.amazon.co.uk/s/ref=nb_sb_noss_2/279-0315467-8152129?url=search-alias%3Daps&field-keywords=redmere
 
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