ViewSonic N4251w-1M, Service Manual

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5. Adjusting Procedure
1. Function Test
1.1. Product
- 42” LCD TV
1.2. Test Equipment
-PC signal generator: CHROMA 2525 CARD ,CHROMA 2327 or 2329,Pioneer
DV-S969AVi.
-TV and Video signal generator.
-Color analyzer: MINOLTA CA110.
-Power meter: CP-310A or CP-320A.
-AC power supply transformer: 110V/120V ±20% 60Hz ±5%.
-Digital ammeter
1.3. Test Condition
Before function test and alignment, each LCD TV should be run-in and warmed up for at
least 30 minutes with the following conditions:
(a) In room temperature,
(b) With full-white screen, and 16 grey scale,
(c) With cycled display modes.
1.4. Test Display Modes & Pattern
1.4.1 EEPROM INIT
A. Timing: 1360*768@60Hz
B. Pattern: 16*12 pane
C. Press ’POWER’, ‘
▲ ’and ‘ENTER’ at the same time, then go into the FACTORY
MODE.
Fig. 1 Fig. 2
D. Figure 1,Select EEPROM INITIAL and press ENTER. The act of EEPROM
INITIAL is completed when EEPROM INIT disappeared.
1.4.2 COLOR TEMPERATURE ADJUSTING
PC MODE:
A. Timing: 1360*768@60Hz.
B. Pattern: 16 grey scale.
C. LCD TV should be run-in and warmed up for at least 30 minutes.
D. Make sure the distance between SENSOR of the CA110 and the LCD TV is about
20cm.
E. Color Temperature adjusting.
1.Fig. 1: under the picture 16 grey scale of VGA source, select WHITE
BALANCE and press ENTER, The color warm will auto adjust. The act of EHITE
BALANCEL is completed when the picture is steady.
2.After adjusting, switch to FULL WHITE and check the value of each color.
Preset color for N4251W(1M)
x=0.283±0.015 y=0.297±0.015
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N4251w-1M
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