Thursday, December 10, 2015

Viewsonic N2751w-1 How to enter to service mode and adjustments

Contents of this article 

  • How to enter service mode 
  • Adjustment after board replacement  
  • How to initialize the TV

Viewsonic N2751w-1 



Function Test
Product
27” LCD TV
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
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.
Test Display Modes & Pattern
EEPROM INIT
A. Timing: 1366*768@60Hz
B. Pattern: 16*12 pane
C. Press ’POWER’, UP and ‘ENTER’ at the same time, then go into the FACTORY MODE.
D. Figure 1,Select EEPROM INITIAL and press ENTER. The act of EEPROM INITIAL is completed when EEPROM INIT disappeared.
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 SENOR of the CA110 and the LCD TV is about 20cm.
E. Color Temperature adjusting.
After adjusting, switch to FULL WHITE and check the value of each color. Preset color for N2751W
x=0.283±0.015, y=0.298±0.015
Under the picture NTSC color bar of YPbPr source, select WHITE BALANCE and press ENTER, The color warm will auto adjust. The act of EHITE BALANCEL is completed when EHITE BALANCEL disappeared.
After adjusting, switch to FULL WHITE and check the value of each color.
Preset color for N2751W
x=0.283±0.015 ,y=0.298±0.015
VGA DDC Key In Procedure
Note:
1. Every time after replacing the main board, you have to do the DDC key in.
2. If you find the DDC does not conform to the LCD TV, you have to do the DDC key in.

Equipment Needed
N2751W LCD TV
DDC Card
PC
RS-232 cable
Barcode Reader
VGA Cable
Setup Procedure
1. Connect VGA Card and DDC Card with RS-232 cable.
2.Barcode Reader connects with keyboard and PC keyboard port.
3. Connect DDC Card and N2751W LCD TV with VGA Cable.
(When key in DVI DDC information, use VGA transform to DVI port.)
4. Connect Power Cord to N2751W LCD TV.
DDC Key In Procedure
1.Run DDC.exe
2.Choose model number and conform the Time then Press “ENTER” key.
3.When appear the PIC “ choose DDC Card”, Press ALT+2 Enter DDC 2B test interface.
4. Press F8 to choose corresponding model. DAT (N2751W-A.DAT press “ENTER” key)
5.Press F9 enter the download interface
6.Key in the serial number or use the barcode reader to scan the barcode of the LCD TV, and press “ENTER” key.
7.The successful picture is as follows. “Compare EDID:OK! Press any key to continue”.
HDMI DDC Key In Procedure
Equipment Needed
N2751W LCD TV
PC
RS-232 cable
Barcode Reader
HDMI Cable
Setup Procedure
1.Connect HDMI Card and DDC Card with RS-232 cable.
2.Barcode Reader connects with keyboard and PC keyboard port.
3. Connect DDC Card and N2751W LCD TV with HDMI Cable.
4. Connect Power Cord to N2751W LCD TV.
DDC Key In Procedure
1.Run DDC.exe
2. Choose model number then
3. Press “ENTER” key.
4. Input barcode
5. Press “ENTER” key, then the successful picture is as follows. “DDC DOWNLOED OK
6. Exit program.
How to enter to Service mode
Press POWER,UP and ‘ENTER’ at the same time, then go into the FACTORY MODE.