JVC LT-40X776/S Service Manual page 22

Lcd flat television
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4.7
ADJUSTMENT PROCEDURE
4.7.1 VIDEO CIRCUIT
Measuring
Item
instrument
525i
Remote
A-D OFFSET
control unit
Signal
generator
Disappears the color at both ends.
1125i
Remote
BRIGHTNESS
control unit
Signal
generator
Set the 0% black part to be brightest.
1125i
Remote
A-D OFFSET
control unit
Signal
generator
Minimize the red and blue noises in
the upper half of the screen.
1-22 (No.YA301)
Test point
Adjustment part
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S008: 5i CB OF(525i cb offset)
S009: 5i CR OF(525i cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S012: HD BL(1125i brightness)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
[1.ADJUST]
S001: PREPARE
(Adjustment setting mode change)
S013: HD CB OF(1125i cb offset)
S014: HD CR OF(1125i cr offset)
S030: R DRIVE(Red drive)
S031: G DRIVE(Green drive)
S032: B DRIVE(Blue drive)
Description
(1) Receive a 525i component ramp pattern
signal.
(2) Set "VIDEO STATUS" to "STANDARD".
(3) Set "ASPECT" to "FULL".
(4) Set "COLOR TEMPERATURE" to "LOW".
(5) Select "1.ADJUST" from the SERVICE
MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "133".
(7) Set < S001 > (adjustment setting mode
change) to set "008" and it change to the 525i
A-D offset adjustment setting mode.
(8) Adjust < S008 > (525i Cb offset) and < S009 >
(525i Cr offset) to lose the gap (red line, green
line and blue line) which appears at both ends
of a white part at the center of the screen.
(9) Set < S001 > to set "000" and it change to the
normal mode.
(10) Press the [MUTING] key to memoirze the set
value.
(1) Receive a 1125i gray scale pattern signal .
(2) Set "VIDEO STATUS" to "STANDARD".
(3) Set "ASPECT" to "FULL".
(4) Set "COLOR TEMPERATURE" to "LOW".
(5) Select "1.ADJUST" from the SERVICE
MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "133".
(7) Set < S001 > (adjustment setting mode
change) to set the values "012" and it change
to the 1125i black level adjustment setting
mode.
(8) Adjust < S012 > (1125i brightness) to set the
0% black part in the upper half of the screen to
be brightest.
(9) Set < S001 > to set "000" and it change to the
normal mode.
(10) Press the [MUTING] key to memoirze the set
value.
(1) Receive a 1125i 30% all white pattern signal.
(2) Set "VIDEO STATUS" to "STANDARD".
(3) Set "ASPECT" to "FULL".
(4) Set "COLOR TEMPERATURE" to "LOW".
(5) Select "1.ADJUST" from the SERVICE
MODE.
(6) Set < S030 > (R DRIVE), < S031> (G DRIVE)
and < S032 > (B DRIVE) to "133".
(7) Set < S001 > (adjustment setting mode
change) to set "013" and it change to the 1125i
A-D offset adjustment setting mode.
(8) Adjust < S013 > (1125i Cb offset) to minimize
the blue noise in the upper half of the screen.
(9) Adjust < S014 > (1125i Cr offset) to minimize
the blue noise in the upper half of the screen.
(10) Set < S001 > to set "000" and it change to the
normal mode.
(11) Press the [MUTING] key to memoirze the set
value.

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