Tuesday, July 23, 2013

[worklog] 4-wire test failed analysis report

4-wire test failed analysis report
1. Background and failed phenomena:
   Background: this is a touch screen control board, support 4-wire and 5-wire touch screen. Verify the 4-wire and 5-wire touch function block diagram by simulating the 4-wire and 5-wire touch screen circuit.
   Phenomena: high fail rate on 4-wire test item, exclude the test issue. Test log/UI shows it is out of range.

2. Fail Rate
  Report 9% fail rate from QA team, 180 pcs/2000.

3. Test log file, compare the failed board with good board
  Good Board Test Log
***** 5 WIRE TEST *****
3.232, 0.058, 3.237, 0.060, 3.231, 0.056
IS  3818, 613   SB  3811, 600  ( 7, 13) -26036,  6864
3.231, 0.058, 3.237, 0.060, 3.231, 0.056
IS  1047, 3289   SB  1040, 3275  ( 7, 14)  11322, -31509
3.231, 0.058, 3.237, 0.060, 3.231, 0.056
IS  1078, 3127   SB  1077, 3122  ( 1, 5)  11698,  32469
3.232, 0.058, 3.237, 0.060, 3.231, 0.056
IS  3281, 1221   SB  3265, 1215  ( 16, 6) -31588,  13110
3.231, 0.058, 3.237, 0.060, 3.231, 0.056
IS  3443, 2913   SB  3444, 2910  (-1, 3) -29763,  30321
3.231, 0.057, 3.237, 0.060, 3.231, 0.056
IS  607, 3822   SB  600, 3811  ( 7, 11)  6847, -26068
3.232, 0.058, 3.237, 0.060, 3.231, 0.056
IS  586, 4028   SB  585, 4020  ( 1, 8)  6692, -23948
3.232, 0.057, 3.237, 0.060, 3.231, 0.056
IS  1967, 1064   SB  1952, 1060  ( 15, 4)  20599,  11537
***** 4 WIRE TEST *****
3.232, 0.057, 3.269, 0.018, 3.231, 0.058
IS  1019, 342   SB  400, 400  ( 619,-58)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  397, 397   SB  400, 400  (-3,-3)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  397, 1196   SB  400, 1200  (-3,-4)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  397, 1999   SB  400, 2000  (-3,-1)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  398, 2806   SB  400, 2800  (-2, 6)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  398, 3617   SB  400, 3600  (-2, 17)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  1196, 397   SB  1200, 400  (-4,-3)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  1196, 1196   SB  1200, 1200  (-4,-4)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  1197, 1999   SB  1200, 2000  (-3,-1)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  1196, 2806   SB  1200, 2800  (-4, 6)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  1196, 3617   SB  1200, 3600  (-4, 17)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2002, 398   SB  2000, 400  ( 2,-2)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2004, 1196   SB  2000, 1200  ( 4,-4)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2004, 2000   SB  2000, 2000  ( 4, 0)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2002, 2806   SB  2000, 2800  ( 2, 6)
3.232, 0.057, 3.238, 0.054, 3.233, 0.055
IS  2003, 3617   SB  2000, 3600  ( 3, 17)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2810, 397   SB  2800, 400  ( 10,-3)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2811, 1196   SB  2800, 1200  ( 11,-4)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2810, 1999   SB  2800, 2000  ( 10,-1)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2812, 2806   SB  2800, 2800  ( 12, 6)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  2812, 3617   SB  2800, 3600  ( 12, 17)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  3616, 397   SB  3600, 400  ( 16,-3)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  3617, 1196   SB  3600, 1200  ( 17,-4)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  3617, 1999   SB  3600, 2000  ( 17,-1)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  3617, 2806   SB  3600, 2800  ( 17, 6)
3.232, 0.057, 3.239, 0.054, 3.233, 0.055
IS  3616, 3617   SB  3600, 3600  ( 16, 17)

Failed Board Test Log
***** 5 WIRE TEST *****
3.258, 0.081, 3.261, 0.089, 3.257, 0.068
IS  3817, 602   SB  3811, 600  ( 6, 2) -25705,  7209
3.258, 0.081, 3.260, 0.089, 3.257, 0.068
IS  1041, 3277   SB  1040, 3275  ( 1, 2)  11582, -31164
3.257, 0.081, 3.261, 0.089, 3.257, 0.069
IS  1090, 3128   SB  1077, 3122  ( 13, 6)  11958, -32719
3.259, 0.081, 3.261, 0.089, 3.257, 0.068
IS  3278, 1208   SB  3265, 1215  ( 13,-7) -31279,  13453
3.258, 0.081, 3.261, 0.089, 3.257, 0.068
IS  3447, 2907   SB  3444, 2910  ( 3,-3) -29448,  30667
3.258, 0.081, 3.261, 0.089, 3.257, 0.068
IS  605, 3812   SB  600, 3811  ( 5, 1)  7097, -25721
3.258, 0.081, 3.261, 0.089, 3.257, 0.068
IS  595, 4020   SB  585, 4020  ( 10, 0)  6943, -23602
3.259, 0.081, 3.261, 0.089, 3.257, 0.068
IS  1956, 1057   SB  1952, 1060  ( 4,-3)  20879,  11881
***** 4 WIRE TEST *****
3.259, 0.081, 3.263, 0.089, 3.259, 0.068
IS  429, 370   SB  400, 400  ( 29,-30)
3.259, 0.081, 3.263, 0.089, 3.259, 0.068
IS  430, 371   SB  400, 400  ( 30,-29)
Due to the closed-source software, can’t understand the detailed log information clearly. But it is really fail on “out of range”.

4. Repeat the 1st level analysis action and verify
 

5..TBD...

6.


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