Acer NA23WABAS Service Manual page 8

1.4.5.2 Display Degradation
Over the life of the product , variation of the parameters
specified in Panel specification shall be maintained
within reasonable limits. The panel must not exhibit any
significant defects while in operation ( excluding the
CCFL operation ).This does not in any way change the
warranty given by the panel manufacturer .
1.4.5.3 Light Leakage
Except for the active display area , there shall be no light
emission visible from any angle from any other part of
the display . For this test , the ambient illumination must
follow panel's specification.
1.4.5.4 Allowable Defects
No cosmetic defects are allowed except those specified
below. The conditions of visual inspections are as
follows :
For 24W Series.
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 isp la y p a tte r n s a n d a r e
u s u a lly th e r e su lt o f c o n ta m in a tio n . D e f e c ts d o n o t v a ry 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 tr a s t v o lta ge is v a rie d .
C o n tra st v a r ia tio n c a n b e a c h ie v e d th r o u g h th e u se o f v a r y in g
g r a 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 isp la y p a tte r n s .
D e fe c ts d o n o t v a ry in s iz e o r in te n s ity ( c o n tr a s t) w h e n
B r ig h t S p o ts / L in e s
c o n tra s t v o lta g e is v a r ie 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 r o u g h th e u se o f v a r y in g g r a y s h a d e p a tte rn 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 isp la y
P o la r iz e r S c ra tc h p a tte rn s d a rk 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 riz e r th a t d o e s n o t d a m a ge 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 isp la y
P o la r iz e r D e n t p a tte rn s d a r k a n d d o n o t v a r y in s iz e . P h y sic a l d a m a g e to th e
p o la riz e r th a t d o e s n o t d a m a ge 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 r a y w ith th e d isp la y
p a tte rn s d a rk a n d m a y h a v e re su lte d f ro m a n " o u t o f c o n tr o l"
R u b b in g L in e
r u b b in g p ro c e ss 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 ism s h e e ts .
N e w to n R in g T h e " r a in b o w " e f f e c t c a u s e d b y n o n - u n ifo rm c e ll th ic k n e s s.
W h e n th e u n it lig h ts, v a r ia tio n / n o n – u n if o r m ity
M o ttlin g ( sp lo tc h in e s s) a p p e a r s 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 r tic 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 ff .
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 r o s s L in e s O ff
d o n o t a p p e a r .
B r ig h t / D a r k D o t A su 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. Product Specification (continued)
1.4.5.7 Other Defects
1.4.5.8 LCD Inspection
Table 4
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.
Undefined defects that are considered to be
rejectable by Wistron will be reviewed by Wistrin as
they become apparent. These panels will be referred
to the Wistron Corporate / Manufacturer Purchasing
Agreement for disposition.
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 .
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
7
ACER V233H
Go to cover page
Minimum Separation
N / A
10 15 mm
10 15 mm
5 15 mm
3 25.4 mm
3 25.4 mm
NONE Not applicable