Acer NA23WABAS Service Manual page 14

1.4.5.4 Allowable Defects
No cosmetic defects are allowed except those specified
below. The conditions of visual inspections are as
follows :
Viewing distance is to be approximately 35-50cm
Ambient illumination is to be 300 to 700 lux. Viewing
angle shall be at 90 degree. Defects not apparent within
one minute shall be ignored.
1.4.5.5 Defect Terminology
Table 3 gives the descriptive terms used in classifying
defects.
Table 3
S p o ts o r lin e s th a t a p p e a r d a r k in th e d is p la y p a tte r n s a n d a r e
u s u a lly th e r e s u lt o f c o n ta m in a tio n . D e fe c ts d o n o t v a r y in
D a r k / S p o ts / L in e s s iz e o r in te n s ity (c o n tr a s t) w h e n c o n tra s t v o lta g e is v a rie d .
C o n tr a s t v a r ia tio n c a n b e a c h ie v e d th ro u g h th e u s e o f v a r y in g
g ra y s h a d e p a tte r n s .
S p o ts o r lin e s th a t a p p e a r lig h t in th e d is p la y p a tte rn s .
D e fe c ts d o n o t v a r y in s iz e o r in te n s ity ( c o n tra s t) w h e n
B r ig h t S p o ts / L in e s
c o n tr a s t v o lta g e is v a rie d . C o n tra s t v a ria tio n c a n b e a c h ie v e d
th r o u g h th e u s e o f v a r y in g g ra y s h a d e p a tte r n s .
W h e n th e u n it lig h ts , lin e s a p p e a r lig h t ( w h ite ) w ith d is p la y
P o la r iz e r S c ra tc h p a tte r n s d a r k a n d d o n o t v a ry in s iz e . P h y s ic a l d a m a g e to th e
p o la r iz e r th a t d o e s n o t d a m a g e th e g la s s
W h e n th e u n it lig h ts , s p o ts a p p e a r lig h t ( w h ite ) w ith d is p la y
P o la r iz e r D e n t p a tte r n s d a r k a n d d o n o t v a ry in s iz e . P h y s ic a l d a m a g e to th e
p o la r iz e r th a t d o e s n o t d a m a g e th e g la s s .
H o r iz o n ta l o r d ia g o n a l lin e s th a t a p p e a r g ra y w ith th e d is p la y
p a tte r n s d a r k a n d m a y h a v e re s u lte d fr o m a n " o u t o f c o n tro l"
R u b b in g L in e
r u b b in g p r o c e s s o n th e p o ly im id e o r " w a v e s " o n th e B E F s o r
p r is m s h e e ts .
N e w to n R in g T h e " r a in b o w " e f fe c t c a u s e d b y n o n -u n if o r m c e ll th ic k n e s s .
W h e n th e u n it lig h ts , v a ria tio n / n o n – u n ifo r m ity
M o ttlin g ( s p lo tc h in e s s ) a p p e a rs lig h t ( w h ite ) w ith th e d is p la y a n d
m ig h t v a r y in s iz e .
W h e n th e u n it lig h ts , lin e ( s ) in th e m o n ito r ( v e rtic a l) o r m a jo r
D im L in e
( h o r iz o n ta l) a x is a p p e a r d im , b u t n o t c o m p le te ly o n o r o f f.
W h e n th e u n it lig h ts , lin e s in b o th th e m in o r a n d m a jo r a x is
C ro s s L in e s O f f
d o n o t a p p e a r .
B r ig h t / D a r k D o t A s u b – p ix e l (R ,G ,B d o t) s tu c k o f f / o n ( e le c tr ic a l).
1.4.5.6 Smudges, Streaks and Smears
When viewing the panel oriented so as to maximize
reflected light , there shall be no visible smudging ,
streaking, smearing or other non-uniformity from
contaminants ,fingerprints, or defects in any of the visible
surfaces. This is independent of whether the unit is
operating or off .
1.4.5.7 Other Defects
Undefined defects that are considered to be rejectable
will be reviewed as they become apparent. These
panels will be referred to the Corporate / Manufacturer
Purchasing Agreement for disposition.
1.4.5.8 LCD Inspection
Put LCD panel on inspection table and illuminate the
panel with a daylight fluorescent lamp located above
the panel surface such that the luminance at the LCD
panel is between 1000 lux and 1500 lux .Defect limits
are given in Table 4 .
Table 4
1. Product Specification (continued)
Average Diameter smaller of
(L+W)/2 or L/20+2W
Greater than 3.75 mm
Note : Allowable distance between spots of two sizes is the minimum separation
number for the smaller spot. Therefore, if there are two spots, 1.30mm and 0.4mm
in diameter, they must be at least 15mm apart.
1.5 Optical Characteristics
Depends on the LCD supplier's spec. Details refer to QA
Inspection Spec.
Acceptable Number
< 0.1mm Non countable
0.1 mm ~ 0.3 mm
0.31 mm ~ 0.5 mm
0.51 mm ~ 1.25 mm
1.26 mm ~ 2.5 mm
2.51 mm ~ 3.75 mm
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ACER V233H
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Minimum Separation
N / A
10 15 mm
10 15 mm
5 15 mm
3 25.4 mm
3 25.4 mm
NONE Not applicable