Oh, I left some hours the forum and you have writing a lot of...
The C23 has been removed.
You can try to put one and see what happens, mine psu (mod) I have put a smd capacitor to this place.
TomC if you wanna to change some electrolytic capacitors look at my post that I had changed all the electrolytic caps and I had a good result to all spikes! (page 87, post 1302
We are to the right road...Carrington will try the EMI spray, TomC search for a transparent shielding material that can be used on the screen...fine!
TomC to mine if I put a small ferrite on the cable going to the TFT LED's there is no any reduces at the radiation, perhaps the various decoupling at the Led Drive Circuit works and ferrite can't to help any more.
"You get what you pay for" is what that I say...thanks TomC the forum isnt' technical support only but including and english teaching!
Carrington don't worry about flat ferrite and mine there isn't this flat ferrite inside. Probably they adding this ferrite from adapter ver. 3.2 and then.
Perhaps some member removed this ferrite to see if works or it is for decorating purpose!