Toshiba TLP470EF Service Manual page 17

4-1. LCD Drive Adjustment
• Save the data in each step.
Adjust Items Input Signal
1. Input level check
1-1. Input level 16-stairstep
adjustment of
RGB signals
1-2. Input level Gray scale or
adjustment of
video signal
1-3. Input level Gray scale or
adjustment of
Y/Pb/Pr signal
2. NRS adjustment
2-1. Vertical stripe
adjustment signal with all
white 50% in
and all black
2-2. NRS level
confirmation signal with all
white 50% in
and all black
3. Center voltage 16-stairstep
adjustment
4. Gamma adjustment
4-1. RGB bias 16-stairstep
adjustment
4-2. RGB black gamma 16-stairstep
adjustment
4-3. Ghost adjustment SMPTE signal
Test
Equip- Test Point
ment
Oscillo- TP701 (R)
waveform scope TP702 (G)
TP703 (B)
Oscillo- TP701
stairstep scope TP702
waveform TP703
Oscillo- TP701 (R)
stairstep scope TP702 (G)
waveform TP703 (B)
Window Oscillo- TP403 (R)
scope TP503 (G)
TP603 (B)
peripherals
at center.
Window Oscillo- TP403 (R)
scope TP503 (G)
TP603 (B)
peripherals
at center.
Oscillo- TP402 (R)
waveform scope TP502 (G)
TP602 (B)
Oscillo- TP402 (R)
waveform scope TP502 (G)
TP602 (B)
Oscillo- TP402 (R)
waveform scope TP502 (G)
TP602 (B)
–––– ––––
Table 1-4-1
Adjust
Adjust Value
mode
VGR • 1.2V ± 20 mV
VGG between pedestal
VGB and white level of
16th stairstep
waveform.
VGR • 1.15V ± 20 mV
VGG between pedestal
VGB and white peak
level.
VGR • 1.15V ± 20 mV
VGG between pedestal
VGB and white peak
level.
WM0 • Adjust so that the
vertical stripe
disappears.
Adjust at TP503.
(WM9) • Confirm the base
level of the
amplitude should
be approx. 1.6V.
WM7 • Adjust for A = B
as shown in
illustration right.
W03 • Adjust the 16th
W04 stairstep wave-
W05 form for following
values:
5.65 ± 20 mV
W0C • Adjust the 2nd
W0D stairstep wave-
W0E form for following
values:
2.6V ± 20 mV
(W1A) • If ghost is high,
adjust in W1A
mode.
1-12
( ) : confirmation only.
Note
• RGB input.
• Trigger the scope at TP901
(H period).
• Video input.
• Trigger the scope at TP901
(H period).
• Trigger the scope at TP901
(H period).
• Select "Y/Pb/Pr" in "RGB
input" on "Setting" menu of
the adjustment software.
B
A
GND
A = Approx. 1.6V
B = 5.5V to 8.0V
• Trigger the scope at TP901
(H period).
A
B
7.0V DC
(center)
TLP451/651
E200 Optical Engine PC300 Camera
Unit Assembly
B180 Lamp House
P800 Power Unit
Z101 Fan
SC01 Arm Position
Detection Switch
P100 Thermal Lead Switch
LCD Block
Projection Lens Filter
• Trigger the scope at TP901
(H period).
2nd stairstep