Some keys are not working on my Cherry G80-8200. Am I out of luck?

[remdell]

One of my Cherry G80-8200LUAUS keyboards came in yesterday.  The seller described the keyboard as working with the exception of the credit card reader.  Yet, when I received the keyboard, several of the keys were not recognized when pressed.  I tried cleaning the keys, the board, and the switches.  I also tried using the Cherry Tools software to reactivate the keys to default, but that did not work either.  At that point I felt like I wanted to return the keyboard, but I knew it was likely to get dumped if I tried returning it, so I requested a partial refund. 

Here are the keys that don't seem to be working: `, 1, 2, 3, tab, q, w, e, a, s, d, caps lock, z, x, c

I have a bad feeling that the left area of the PCB is dead because the non-workings switches are all the left side.  I checked the soldering on every switch, and all switches seem to be soldered well in place.  I haven't tried desoldering the not working keys yet because my brother lost my desoldering pump, but when I do get a desoldering pump, I plan to take one of the working programmable cherry switches from the board and try them out in the places of the non-working switches.

Any ideas as to what I should do?

I can get pictures if needed.

[Dwhangkhui]

can you get a multimeter so you can test the switches?
I find it improbable that many switches don't work suddenly. Most likely the controller has been damaged. It may be that the cable that connects the 2nd pcb isn't seated probably.

[IvanIvanovich]

I suspect one of the matrix ribbons to the controller has come loose. This happens often in shipping since they are just friction fit. It is a simple fix, just open the case and slide the back into their terminals.