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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