Raster Distortion Check - Hitachi 51UWX20B Service Manual

2.10 Raster distortion check

Checking condition
(1) Digital convergence adjustment should have been completed.
(2) Receive the cross-hatch signal (internal signal of the set is acceptable).
(3) Brightness/Contrast --- standard condition
Contrast : max
Other controls : center position
(4) Check the raster distortion specification: Value shown in the table below or less.
A ~ D
---Measure the winding of the outside line.
I ~ L
C
I
BACK TO ADJUSTMENTS
Item
Top/Bottom pincushion distortion
Right/Left pincushion distortion
Center line Vertical line
tilt Horizontal line
Center line Vertical line
winding Horizontal line
Trapezoidal distortion Vertical line
Skew distortion Horizontal line
A
B
G
Symbol 43" 51"
A,B
±5 ±6
C,D
±4 ±4
E 5 6
F 5 6
G
±3 ±3
H
±3 ±3
I,J 4 5
K,L 5 6
D
J
32
(unit: mm)
57"
±6
±4
6
6
±4
±4
5
6
F
E
K
H
L
DP23/23G/24