Sunday, January 10, 2016

NOBLEX 42LC822 Service mode white balance adjustments and power supply circuit - LCD Television Service and repair

Category: LCD Television Repair and service 

Contents of this article 

  • How to access to service mode
  • Setting initial data 
  • White Balance adjustment 


NOBLEX 42LC822

On-screen Service Menu System
Quick operation is needed to enter Service Mode.
How to enter the Service Menu
1. Press and hold the MENU button on Side Controls.
2. Keep pressing the MENU button and press the MUTE button on the remote control, and the FACTORY MENU
will be displayed.
How to select the service item and adjust data 
To adjust data
1) Select “DATA” line by pressing UP or DOWN button.
2) Press LEFT or RIGHT button to adjust data.
To exit service mode
Press MENU button to exit service mode.
Note: The all adjusted data in service mode will be memorized into EEPROM automatically.
Setting the Initial data
This adjustment is controlled by the CPU (IC8000) through the IIC Bus Data Line in the chassis, and those adjustment data are memorized the memory IC (IC8001). Therefore, Main board or the memory IC (IC8001) is replaced, these data will be disappeared. Readjust should be made. Initial data is provided in the CPU ROM, when the memory IC
(IC8001) is replaced with new one. CPU ROM data is loaded into the memory. Initial data is provided to operating the monitor basically. For operating the monitor quality performance, further adjustment is required following chassis electrical adjustment.
1. Receive good quality signal.
2. Enter the Service Mode.
3. Confirm data value to be the same as the Service Adjustment Data Table. If it is different, change to correct data
4. Exit the Service Mode.
White balance Adjustment
Pattern
White Pattern 100% (in AV mode).
Condition
Picture Mode: STANDARD
Color Temperature: NORMAL
Aging Time: More than 10 minutes
Adjustment
1. Enter the Service Mode.
2. Select "Source ALL" by pressing ed button, and select "Properties White" by pressing 7 8 button.
3. Set R,G,B value to “FF” by pressing NUMERIC buttons.
To adjust Red : Press 1 (data value up) and 4 (data value down).
To adjust Green : Press 2 (data value up) and 5 (data value down).
To adjust Blue : Press 3 (data value up) and 6 (data value down).
4. Decide one item in three items to a fixed value (For example, let R be fixed value), select item of other 2 colors (Example, G or B), and adjust to produce a normal black and white picture in highlight areas.
(Note: At this time, Adjust the other 2 colors data less than fixed data.)
5. Exit the Service Mode.
After adjustment, confirm white balance again by normal picture.
POWER SUPPLY SCHEMATIC 
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