An Investigation Into Ball Grid Array Inspection Techniques

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Oesa STM-261 Figure 52. X-tek angled transmission image of sample 3 showing (1) non-wetted pad (C13) and (2) solder balls. Figure 53. Glenbrook perpendicular transmission image of sample 3 showing non-wetted pads (C13, F13, G9). Solder balls were not detected at this magnification. 40
. ..~.' '...~ .' _.I:t!IIDJ:I ""'1:.:- :IIllImlr8 1- -~._.I........ 1'1::8, . . .".'.' .". .'. .'.,. . . . ' '@...i.'~ 2 . .'.. .,..@.,.. .'.e.. M15 .'. .f~...,. .,... ,1... . .'.''..14,....... . ... ~'~.~".~ ~'.!,. .~'.- .'.. ~ '." y",".: 41 Ball Grid Array Inspection Techniques Figure 54. Nicolet perpelldiculllr trallsmissioll imllge of ,mmple 3 with (/) missillg blllls (F2, C5), IIoll-wetted pllds C13, F13, G9, K9, M8, PIO lllld (2) bridge Pl5. Solder blllls were IIOt detected lit this mllgllificlltioll. Figure 55. Detlliled microsectioll through bllll C13, showillg pllrtilllwettillg of plld.
Page 1 and 2: An Investigation Into Ball Grid Arr
Page 3: Abstract An evaluation of four diff
Page 7 and 8: 1 Introduction X-ray techniques hav
Page 9 and 10: X-rays and displays them as an imag
Page 11 and 12: Each defect was identified using th
Page 13 and 14: 2.3 BGA PCB Image Summary of defect
Page 15 and 16: Sample 4 Misaligned component 2.4 U
Page 17 and 18: 4. Equipment Evaluated Four machine
Page 19 and 20: 'If ~ c.S"'
Page 21 and 22: 5. Results This section is structur
Page 23 and 24: ...~,.--= o't:ll.JOII_s_8I:Jt11l .
Page 25 and 26: 19 Ball Grid Array Inspection Techn
Page 27 and 28: .-:;,... ~ "''' . ..~ , '. ., ' -,
Page 29 and 30: 5.3 Results For Sample 2 The defect
Page 35 and 36: ~e 88el, e~.~tti '88.~_",! 88M_llle
Page 39 and 40: 5.5 Results For Sample 3 The defect
Page 41 and 42: ~. ij.ij, --- - -- - # . '\>. ~ l 3
Page 43: ~,-a;_:,t. ,"""~.. '~::-~-",;;:-:~,
Page 47 and 48: The laminography system also behave
Page 51 and 52: f '~"~>-" . 1 ~"I ,} ""'"''-'''''''
Page 55 and 56: 5.11. Identification of voids withi
Page 57 and 58: Table 1: Defect Detectability and L
Page 59 and 60: 7. Recommendations The most sensiti
Page 61 and 62: 9. References 1. ESA PSS 01-708 The
Page 63: ~esa STM-261 Editor: Copyright: Pub

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