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???
05/11/06 17:18
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 		 #116003 - Bonded ?
Responding to: ???'s previous message
Erik Malund said:
I have my boards contract manufactured and just found a few where the β€˜leg’ of the chip had disconnected at the chip (β€˜*’ in ASCII drawing below) ___________

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/ _*__| TQFP F12x

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PCB What are the possible causes of this?

Erik


Is the chip bonded to the board before reflow ?

Steve



List of 64 messages in thread
TopicAuthorDate
loosing legs            01/01/70 00:00      
   Bonded ?            01/01/70 00:00      
      I woudn't know, but how else would they            01/01/70 00:00      
   Possible mishandling?            01/01/70 00:00      
      nope            01/01/70 00:00      
         Microscope            01/01/70 00:00      
            basically            01/01/70 00:00      
               Weird            01/01/70 00:00      
   Ask contractor?            01/01/70 00:00      
      I will            01/01/70 00:00      
         It's a defect - let them figure it out.            01/01/70 00:00      
            nope            01/01/70 00:00      
               photo-micrograph            01/01/70 00:00      
                  have no microscope camera attachment            01/01/70 00:00      
                     Device failure            01/01/70 00:00      
                        the manufacturer is being tried            01/01/70 00:00      
   How many?            01/01/70 00:00      
      I do not know            01/01/70 00:00      
         you keep referring to "glue"            01/01/70 00:00      
            Glue            01/01/70 00:00      
            they are still attached            01/01/70 00:00      
               visual inspection, pre-assembly?            01/01/70 00:00      
                  No, of course not            01/01/70 00:00      
               Sabotage...            01/01/70 00:00      
                  Analysis            01/01/70 00:00      
                     none, I can see no cause but "dissolved            01/01/70 00:00      
                        About the "glue"            01/01/70 00:00      
                           just the pin            01/01/70 00:00      
                              Oops!            01/01/70 00:00      
                                 not with a temperature controlled one            01/01/70 00:00      
                                    Very strange...            01/01/70 00:00      
                                       Other chips?            01/01/70 00:00      
                                          not visible with the magnification I hav            01/01/70 00:00      
                                             More questions            01/01/70 00:00      
                                                nope            01/01/70 00:00      
                                                   relegated to "excessive stress"            01/01/70 00:00      
                                                       "reworking"?            01/01/70 00:00      
                                                         RE: reworking - it would take real fools            01/01/70 00:00      
                                                      Super disaster!            01/01/70 00:00      
                                                         in Germany, too?            01/01/70 00:00      
                                                            My waaayy            01/01/70 00:00      
                                                            Probably blowtorch, chisel and hammer            01/01/70 00:00      
                                                            Both they and we have a "SMT chip remova            01/01/70 00:00      
                                                               "SMT chip removal machine"            01/01/70 00:00      
                                                                  actualy It is quite ingenious            01/01/70 00:00      
                                                                     hmmmm            01/01/70 00:00      
                                                                     Inexperience            01/01/70 00:00      
                                       there's good reason ...            01/01/70 00:00      
                                          that saw no reason for CYA            01/01/70 00:00      
                                             I hope they're paying for the parts ...            01/01/70 00:00      
                                                I have been discussing this with the pur            01/01/70 00:00      
                                                   That's the Silab price ...            01/01/70 00:00      
                                                Assembly houses            01/01/70 00:00      
                                                   That's why the work is moving to Asia            01/01/70 00:00      
                                                      how morbid!!            01/01/70 00:00      
                                                         Yours or ours?            01/01/70 00:00      
                                                            draconian measures            01/01/70 00:00      
                                                               perhaps not ...            01/01/70 00:00      
                                                                  Not always true            01/01/70 00:00      
                                                                     If it doesn't cost, they have QC            01/01/70 00:00      
                                                                  self contradictory statement            01/01/70 00:00      
                                                                     Ask any boss ... he thinks he's a worker            01/01/70 00:00      
   Reminds me..            01/01/70 00:00      
   V-grooved PCB???            01/01/70 00:00      

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