回複：Thanks!

Thanks for the info.  I was not angry.  What I was trying to say is that if we can solve the problem for $20 then just go ahead in stead of unnecessarily spending time on figuring it out.  The only risk is just $20 wasted (not completely wasted though since it's still a backup if other problem is solved).  I was definitely offering my opinion in terms of my knowledge and experience since I am not an expert on the electronics other than the basic stuff.  If you are an expert and think it worth time then go ahead.  Nothing personal.