Toshiba TLP-450U, Service Manual

Page: 16 / 61

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