Adjustment - LG FLATRON W2486L Service Manual

1. Coverage
Apply to 24" Wide monitor made in Monitor Factory(Kumi
Korea) or made in accordance with the standard of Kumi
Factory process.
2. Appointment
2.1 Adjustment must be done as fixed sequence, and adjustment
sequence can be modified after agreement withthe responsible
R&D engineer considering mass-production condition.
2.2 Power : AC100~240 Voltage (Free)
2.3 Input signal : As Product Standard ( Signal ROM: W2286l V0.1)
2.4 Warm-up Time : Over than 5 minutes
2.5 Adjustment equipment : White balance equipment (CA-
110/210), Display adjust equipment, VG-819(or VG828),
Oscilloscope, PC (More than 486 computer ) & White balance
adjust program.,HDCP Adjusting Jig equipment.

3. Adjustment

3.1 Overview
Use factory automation equipment and adjust automatic
movement. But, do via passivity adjust in erroroccurrence.
3.2 Adjustment order
(refer to the Adjustment standard and adjustment command table)
3.2.1 Board Assembly Line
· Connect input signal to 15pin D-sub.
· Ready for adjustment : check whether adjustment command
works normally or not and the operating state of each mode.
Check the display state of gray color when 256 gray scale
pattern is embodied.
· Read by EEPROM Read Command to check whether initial
value is correct or not.
3.2.2 Total Assembly Line
· Input analog signal. (1920x 1080@60Hz)
· Write HDCP Key to EEPROM(24C16) by using DDC2AB
protocol&HDCP Adjusting equipment [Address 0xAC 80, 289
btes]
· If error is occurred, write and check again.
· Ready : Heat-run during 5 minutes in the state with signal
· Connect input signal to D-sub.
· Default value before adjustment : Contrast "70" , Brightness
"100(Max)"
3.2.3 Adjustment of Horizontal/Verticality screen
position, Clock and Clock Phase at each Mode.
· There is no special factory mode adjustment.
Writing initial value of EEPROM in Board Assembly line is
adjusting Preset Mode and Reset mode. (EEPROM is
initialized when AC Power is ON first.)
· If the change of FOS data is needed after M.P, it is possible by
writing Mode Data with EEPROM write command or modifying
the Mode Data in MICOM itself.
# Caution) Must keep power-on more than 3 seconds after AC
Power-on first time.
Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
ADJUSTMENT
3.2.4 Color coordinates adjustment and Luminance adjustment.
3.2.4.1 Color coordinates adjustment
· Monitor Contrast / Brightness
- Contrast : 70
- Brightness : 100(Max)
· CA-110/210: Set "Channel 7" ->
CA-110: channel8. CA-210: channel5
· Signal Generator : At cut-off and drive ->
16 step pattern for ADC
- Output Voltage : 700 mVp-p
- Output Mode : Mode 13( WSXGA+ 60Hz )mode Setting.
3.2.4.2.Adjustment : Board Assembly Line
· Input 16 step pattern for ADC (Mode13, pattern 11). (Video level
: 700 mVp-p)
· Adjust by commanding AUTO_COLOR_ADJUST Confirm
"Success" message in Screen or Check the data of 0xFE, 0xFF
address of EEPROM(0XA6) is 0xAA after waiting 5 seconds
· If there is "FAULT" message or the data of 0xFE, 0xFF address
of EEPROM(0xAA) is not 0xAA, do adjust again
· If all Adjustment is completed, the values of 6500K, User Color
and 9300K are saved automatically.
3.2.4.3. Confirm at Total Assembly Line: adjustment
· Check the data of 0xFE, 0xFF address of EEPROM(0xA6) is
0xAA.
· If the data of 0xFE, 0xFF address of EEPROM(0xA6) is not
0xAA, do adjust again by 3.2.4.2.
3.2.4.4. Confirm PRESET 6500K Color coordinates and Adjust
PRESET 9300K Color coordinates .
· Set as Aging mode ON, by commanding AGING_ON/OFF
command code.
· Select Module that is being used in present production by
commanding MODULE SELECT.
· Send SYSTEM RESET command to set Module data.
· Input Full White Pattern (Video level : 700 mVp-p)
· Set as 9300K by commanding COLOR_MODE_CHANGE
Command code.
· Adjust to meet x = 0.283 ± 0.004, y=0.298±0.004, and confirm.
· Save 9300K Color by commanding COLOR SAVE Command
code.
· Input Full White Pattern (Video level : 700 mVp-p)
· Set as 6500K by commanding COLOR_MODE_CHANGE
Command code.
· 6500K color adjustment
It's not TCO model.
Don't need to adjust 6500K color.
If this TCO 03 spec should be satisfied later, refer to below
method.
Adjust to meet x = 0.313 ± 0.007, y=0.329±0.007, and confirm.
* (Option)
It's another method for 6500K color adjustment at Gumi & NT
At first, check ∆UV. If that is under 0.0065, the set is not adjusted.
If not. It is adjust to meet u'= 0.198±0.0065, v'=0.469±0.0065
· Set as sRGB by commanding COLOR_MODE_CHANGE
Command code.
· Adjust to meet Y = 180 ± 10, and confirm.
- 11 -
LGE Internal Use Only