Sharp 21V-FS700S, Service Manual

Page: 20 / 91

21V-FS700S
3 – 17
4. SCREEN, WHITE BALANCE, SUB-BRIGHTNESS & SUB-CONTRAST ADJUSTMENT
NO ADJUSTMENT POINT WAVEFORM OR OTHERS
1 SCREEN
ADJUSTMENT
(I2C BUS CONTROL)
ADJUSTMENT CONDITION / PROCEDURE
(1) Make sure the following items are in INITIAL
DATA before adjust CRT cutoff
(a) 15 DRI-RS = 32
(b) 16 DRI-GS = 32
(c) 17 DRI-BS = 32
(d) 18 CUT-RS = 16
(e) 19 CUT-GS = 16
(f) 20 CUT-BS = 16
(f) 21 SUB BRI = 24
(g) 22 SUB CON = 59
(h) 32 CUT OFF = 25
(i) 35 BLOC = 4
(2) Switch TV to video mode, blue back off, with
no signal and press R/C to set picture into
normal condition.
(3) Go to service mode, select item 31 VSD
(dark screen display)
(4) Adjust the Screen so that cut-off line appear in
low bright, then judge that whether the cut-off
line appear in Red or Green or Blue color, in
this condition between CUT-RS & CUT-GS &
cut-BS, fix the data of the color appear in
cut-off line and adj the other two cut-off data
(Note 1) so that cut-off line color become white.
(5) Turn the screen VR of FBT so that cut-off line
just disappear
(1) WHITE (HIGH BEAM)
First use Minolta Color Analyzer CA100, let the
gun point at
Dark White position (as drawing
attach), Adj SUB-BRI until LUMINANCE Y
become 1.5 cd/m2 , then let the gun point at
White position (as drawing attach), Adj SUB-
CON until LUMINANCE Y become: 150 cd/m2.
Adj the DRI-RS & DRI-BS until the axis of color
temperature become
15000 K X : 0.254 , Y : 0.261
(2) DARK WHITE (LOW BEAM)
Let the gun point at Dark White position, if
the color temperature data shift away from the
data adjusted in
Item 1 Screen adjustment,
adjust CUT-RS, CUT GS & CUT-BS.
Please fix the first colour appears in Screen
adj item step (4) is fixed, adj the other two
so that to obtain the similar axis as above.
** Repeat step 1 & 2 to get a regulated
position
*Note:
During Service Mode select 31 VSD
(dark screen display), if the vertical line
does not appaer please press VOL UP
key.
*Note : Use RF window pattern US14
2 WHITE BALANCE ADJ
(to be done after
screen adj)
(I2C BUS CONTROL)
White
50% WHITE
Dark
White
°
(US-14 CH)