Sửa phím back cho bb 9860

This is my experience with the 9860 back button problems and how I seemed to fix it and how you can too.
 
We bought 3 - 9860 phones back last Sept. and one had the problem in about Nov. and another one in Feb/March.
 
What i did figure out early on is that if you press the back button and it did not work, while holding it down simply rub another finger over the send button and Voila it would work.
 
This was great to get it to work temporarily, however quickly became a pain having to use 2 hands every time i needed to do a simple function on my phone.
 
I am in the electronics field and quickly realized that the trouble was not as much with the back button as much as it was with the SEND button. Think about it... how often do you press the SEND button? I never did I don't place or receive many calls, but these buttons seem to be connected somehow and when the SEND button connection is bad it seems to make the BACK button not work.
 
*FIX*
 
We had 2 of 3 phones with this problem so this is what I did to fix both. The First one i took apart to see what i could see and to find out if there was a loose connection etc. The buttons are a sealed unit underneath and do not come out to be cleaned or checked.
 
I took cleaning alcohol and poured it over all the keys and proceeded to press all the keys numerous times working more with the SEND key then the others. I then took compressed air and blew air into the keys to dry out any remaining alcohol.
 
After reassembling the phone it has been GREAT and no more BACK button issues since the cleaning.
 
The second phone (which was decidedly worse) I decided to do the same thing except NOT taking it apart. But PLEASE remember take the battery out first if not you could seriously damage your phone.
 
After taking the battery out I poured cleaning alcohol over the keys on the front side and again repeatedly pressed the buttons concentrating more on the SEND button. i was surprised to find out that this has fixed the second phone as well.
 
I am not sure if this fix will stick but i can tell you with 2 phones that could not use the back button we are happy with this fix. I was starting to hate this phone but now i love it again.
 
Sorry for the long post but i wanted to give some history to this problem.
 
Cheers