Drive Adjustment Check; Dot Stripe Checking; Sub Ghost Checking; Horizontal Crosstalk Checking - Hitachi 50VF820 Service Manual

2.10 DRIVE ADJUSTMENT CHECK

2.10.1 DOT STRIPE(vertical lines 12 dot width) CHECKING and ADJUSTMENT
ADJUSTMENT ITEMS
0 PREPARATION Complete White uniformity adjustment before the adjustment.
SIGNAL
1 Internal signal from IC（Dot pattern with gray scale）
RED Stripe
2 LCD ADJUST MODE →STRIPE
adjustment
LCD ADJUST MODE
STRIPE R0
STRIPE R1
STRIPE R2
STRIPE R3
STRIPE R4
Press SELECT key, test pattern will be displayed.
Check that no vertical line with pitch of 12 dots on screen.
If there is, adjust the data by pressing left or right cursor stick ◄►of
handset.
5 signal levels are required to check and adjust the vertical stripes.
Signal levels are changed pressing ▼cursor of handset.
Press SELECT key of handset return to the LCD ADJUST MODE.
GREEN Stripe Press " " key to select Green.
3 ▼
adjustment
Check and adjust Green stripe with same procedure as Red Stripe.
BLUE Stripe Press " " key to select Blue.
4 ▼
adjustment
Check and adjust Blue stripe with same procedure as Red Stripe.
2.10.2 SUB GHOST CHECKING and ADJUSTMENT
ADJUSTMENT
ITEMS
0 PREPARATION Complete White uniformity adjustment before the adjustment.
SIGNAL
1 Internal signal from IC（50% white window pattern ）
Sub Ghost R
2 LCD ADJUST MODE →S GHOST
adjustment
LCD ADJUST MODE
S GHOST R
S GHOST G
S GHOST B
Press SELECT key, test pattern will be displayed
Check that no ghost on right hand side of the window.
If there is, decrease Ghost by pressing cursor stick ◄► of handset
Press SELECT key of handset return to the LCD ADJUST MODE.
Sub Ghost G
3 Press " " key to select green. Check and adjust sub ghost green with
▼
adjustment
same procedure as Red SUB GHOST.
Sub Ghost B
4 Press " " key to select blue. Check and adjust sub ghost blue with
▼
adjustment
same procedure as Red SUB GHOST.
BACK TO ADJUSTMENTS
ADJUSTMENT PROCEDURE
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ADJUSTMENT PROCEDURE
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SUB GHOST
12dots
2.10.3 HORIZONTAL CROSS TALK CHECKING and ADJUSTMENT
ADJUSTMENT ITEMS
0 PREPARATION Complete White uniformity adjustment before the adjustment.
Internal signal from IC (50% white window pattern)
1 SIGNAL
2 STREAK LEVEL R LCD ADJUST MODE → STREAK
STREAK SLOPE R
LCD ADJUST MODE
R LEVEL
R SLOPE
G LEVEL
G SLOPE
B LEVEL
B SLOPE
Press SELECT key, test pattern will be displayed
Check that no horizontal cross talk on right side of the window.
If there is, adjust the "R-LEVEL" by pressing cursor stick ◄► of
handset.
If cross talk does not disappear with "R-LEVEL", press ▼ key and
adjust "R-SLOPE" until cross talk is disappeared.
Press SELECT key of handset return to the LCD ADJUST MODE.
3 STREAK LEVEL G Press "
STREAK SLOPE G with same procedure as Red cross talk.
4 STREAK LEVEL B Press "
STREAK SLOPE B same procedure as Red cross talk.
38
LC58/LC58E
ADJUSTMENT PROCEDURE
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xx
" key to select Green. Check and adjust Green Streak
▼
" key to select Blue. Check and adjust Blue Streak with
▼
Horizontal Crosstalk