Symptoms :

The touchpad and keyboard not responding and or the sreen coloured stripes crash,

I found 2 possibillity for this issue :

the first one, a south bridge problem due to bad quality component I have had this problem and when it was hapening the right part of the keyboard was hot near from the palm rest, by studying the service manual I find that this was the place of the south bridge and when I send my lappy for repairing to Acer they directly change the motherboard.

The second : I saw on the scheme that the touchpad and keyboard depend of a ship named ENE KB910 and maybe the fault come from it.

Sure that it's a hardware problem, resulting of the failure of low price component...

Below is the block diagram of the 5100 :