Dell 1720 TouchPad delay

[leachim]

I have a Dell 17" 1720 Laptop

 

Every few seconds there is a delay when using the Touchpad, then it will work for a few seconds etc

 

USB mouse is fine

 

Here's the weird thing - problem goes away when running on battery

 

The charger that is rated at 6 AMPS works ok - no problems with Touchpad

 

The smaller one (although advertised as working with the 1720) is what causes the problem - it is rated at 19.5 V 4.62 A = 90 W

 

The larger one is same voltage - 6.2 A and 130 W

 

No other issues other than the intermittent touchpad....

 

Any ideas ?

[difinity]

It sounds like an earthing issue, I've seen similar occasionally with non genuine chargers.

[leachim]

Ah

Is there any way to counteract this ?

[leachim]

Just tested the small one and there is no metal in the 3rd earth pin - so no connection between house earth and laptop

 

The larger one has a metal earth pin - so there is the link.....

[leachim]

Yep

Just to confirm - I bought a similar 90W power supply with a metal earthing pin (UK) and I have no problem

Hope this helps someone