Service manual

17
LC-20B4U-S
LC-20B4U-B
Test patterns in adjustment process mode
[1] IC801 (Video decoder) test patterns
1-1. Getting the test patterns displayed
Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select "TEST PATTERN" in the 3rd line of VPC 1, make the settings 1 thru 6, and the following test patterns
show up.
1-2. Test patterns
» Setting 1
» Setting 2
Finer vertical stripes than Setting 1 are displayed.
» Setting 3
» Setting 4
A rather dark green-only pattern is displayed.
» Setting 5
A half-tone green-only pattern is displayed.
» Setting 6
A rather bright green-only pattern is displayed.
[2] IC1201 (LCD controller) test pattern
2-1. Getting the test pattern displayed
Put the screen in AV1, AV2 or COMPONENT but keep out any signal. Call the adjustment process mode,
select "TEST PATTERN" in the 3rd line of DPS 1, turn on the setting, and the following test pattern shows up.
2-2. Test pattern
The following test pattern appears.
Note: When the IC801 and IC1201 test pattern display commands are both turned on at the same time, the IC1201
test pattern is given priority.
The color bars are displayed as shown at left.
The green pattern is displayed as shown at left.
greengreen Yellow Yellow Cyan Cyan Magenta Magenta Green Green Red Blue
Bright BrightDark
Green
Black Gray White
Gradation
Dark Dark
Dark
Dark
Dark
Gray scale Bright
Bright
Bright
Bright
Dark Red
Green
Blue
Dark
Dark