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Mr Snotty
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Topic # 166097 2-Mar-2015 19:57
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Not quite sure what is causing this but the laptop is an Alienware 14 (thanks BigPipe!) and the switch is a Netgear 16pt Prosafe Gigabit Switch sitting in the comms room (image here), anyone have any ideas why my touchpad stops working? I've also noticed that sometimes my touchpad goes a little crazy when it is hooked up to normal AC power indicating maybe an earthing issue in the house?



I've replaced the power cable on my switch thinking it was potentially not earthed but appears it is. If I plug it directly into my router the issue is still there but on a far less extreme level.




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Mr Snotty
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  Reply # 1249763 2-Mar-2015 20:13
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Hmm and thinking that the laptop power supply will act as another return to earth:





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  Reply # 1249774 2-Mar-2015 20:20
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Interesting.

While i have as much of an idea of what it could be as you, I have seen odd things happening with dodgy switches too.

With my issue, i found my TPLink switch affecting the modem, causing high CRC and FEC error rates.


Never noticed it causing issues with other devices in the house however.




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  Reply # 1249780 2-Mar-2015 20:25
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hio77: Interesting.

While i have as much of an idea of what it could be as you, I have seen odd things happening with dodgy switches too.

With my issue, i found my TPLink switch affecting the modem, causing high CRC and FEC error rates.


Never noticed it causing issues with other devices in the house however.


I can get 1gbit straight to my Microserver over the switch so am pretty sure it is not due to anything on the Ethernet layer, I think it is electrical causing it but don't really want to replace the switch unless if I know that is what is causing it. My thoughts are dodgy earth in the house however I don't have any real way of testing this to be sure.

When picking up the laptop it corrects itself? I am now really really confused (the bottom is mostly an aluminium fan grill and I am sitting on the floor so earth?) :





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  Reply # 1249925 2-Mar-2015 23:03
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Plug both the laptop and the network switch into 1 powerboard at the same time. Does this fix the problem? Also try taking the laptop and network switch to a friends house and try them there. If either thing fixes it then you have an earthing problem in your house.

The issue you are having is most likely caused by high frequency interference running through your power and network cables in your house. Due to a possible earth problem. Also are using genuine power supplies to run the laptop and network switch? As counterfeit ones often lack the required interference filtering circuits. (as well as often being dangerous).







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  Reply # 1249958 3-Mar-2015 00:06
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Aredwood: Plug both the laptop and the network switch into 1 powerboard at the same time. Does this fix the problem? Also try taking the laptop and network switch to a friends house and try them there. If either thing fixes it then you have an earthing problem in your house.

The issue you are having is most likely caused by high frequency interference running through your power and network cables in your house. Due to a possible earth problem. Also are using genuine power supplies to run the laptop and network switch? As counterfeit ones often lack the required interference filtering circuits. (as well as often being dangerous).


Perfect just what I thought.

So far I've tested:
1) Laptop direct into Switch - causes issues.
2) Laptop into WRT1900AC Router - causes issues.
3) Laptop into WRT1900AC Router + disconnected from Switch - less issues but still noticeably there.
4) Laptop PSU connected to same circuit as network equipment - less issues but still noticeably there.

The switch is powered by an internal PSU connected by an IEC cable, router is powered by what came with it. I've tried disconnecting everything from it and didn't make any changes.

Laptop on battery - totally fine, laptop on PSU (most of the time) has some faults but when laptop is on lap (grounded to a degree) it is fine.

So, appears to be an earthing problem. Looking around the property I can't seem to find a ground pin to check (normally this seems to be beside the fuse box), it is a newish building built in 2005 so I would have thought it would have been there, any ideas how I could troubleshoot this?



Cheers.




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  Reply # 1250653 3-Mar-2015 23:31
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Have you done the tests I have said yet? As the "plug everything into the same powerboard at the same time" test is to at least link the earth pins of all devices together. Even if they are still not linked to the mass of earth.





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  Reply # 1250876 4-Mar-2015 11:16
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I have had issues with my dell laptops with their crap touchpad (not the synaptics one) come right by placing my hand flat on the touchpad covering it all for a few seconds. Seems to make it recalibrate or something and then its right for a while.

Is the laptop PSU a 2 or 3 pin plug? If its 2, then no earth at all, and there may be something happening to earth it out thru ethernet via the suspression capacitors that are between the isolated side and the computers chassis.




Richard rich.ms



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  Reply # 1252547 6-Mar-2015 22:52
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Yep done the tests with the power adapter plugged into the same multiboard the switch / networking equipment is plugged into, same result.

I've checked the external earth and used a Multimeter to check the connection from that to the earth pin on the switch etc and found them to be connected, so they're earthed. My guess is some High Frequency voltage (or something) is getting into the laptop causing it to freak out. I just tested this with my partners laptop and getting the same except not as extreme.

richms: I have had issues with my dell laptops with their crap touchpad (not the synaptics one) come right by placing my hand flat on the touchpad covering it all for a few seconds. Seems to make it recalibrate or something and then its right for a while.

Is the laptop PSU a 2 or 3 pin plug? If its 2, then no earth at all, and there may be something happening to earth it out thru ethernet via the suspression capacitors that are between the isolated side and the computers chassis.


The Laptop PSU is a 3 pin plug - will need to try the hand flat trick, cheers for that!




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