Acer RB23WABAS service manual Diameter, they must be at least 15mm apart

1. Product Specification (continued)

ACER H233H

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1.4.5.4 Allowable Defects

No cosmetic defects are allowed except those specified below. The conditions of visual inspections are as follows :

For 23 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.

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 .

B r ig h t S p o ts / L in e 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

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

R u b b in g L in e

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 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 .

D im L in 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

( 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.

C ro s s L in e s 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

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).

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Average Diameter smaller of	Acceptable Number	Minimum Separation
(L+W)/2 or L/20+2W
< 0.1mm	Non countable	N / A
0.1 mm ~ 0.3 mm	10	15 mm
0.31 mm ~ 0.5 mm	10	15 mm
0.51 mm ~ 1.25 mm	5	15 mm
1.26 mm ~ 2.5 mm	3	25.4 mm
2.51 mm ~ 3.75 mm	3	25.4 mm
Greater than 3.75 mm	NONE	Not applicable

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.

1.5Optical Characteristics

Depends on the LCD supplier's spec. Details refer to QA Inspection Spec.

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