LG 34UM61, Service Manual

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Only for training and service purposes
4. Total Assembly line process
4.1 Write HDCP Key
Write HDCP Key into EEPROM by using DDC2AB protocol & HDCP Adjustment Jig equipment.
If error is occurred, try to write again.
After download HDCP key, send command ‘0xE6 00 00’ for loading RAM memory correctly.
4.2 White balance adjustment
4.2.1 Confirm PRESET WARM(6500K) Color coordinates and PRESET COOL(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 COOL(9300K) by commanding COLOR_MODE_CHANGE Command code.
4.2.2 COOL (9300K) color adjustment
-. If this TCO spec should be satisfied later, refer to below method
-. Adjust to meet
x = 0.283 ± 0.004, y=0.298±0.004 , and confirm
-. Save 9300K Color by commanding COLOR SAVE Command code
-. Set as 6500K by commanding COLOR_MODE_CHANGE Command code.
4.2.3 WARM(
6500K) color adjustment
-. If this TCO spec should be satisfied later, refer to below method
-. Adjust to meet x = 0.313 ± 0.003, y=0.329±0.003 , and confirm.
(Option) It’s another method for 6500K color adjustment at GUMI & NT
At first, Check
Δ UV. If that is under 0.06
5, the set is not adjusted
If not, It is adjust to meet u’= 0.198±0.65, v’=0.469±0.65
In case of this model, sRGB Adjustment is not required
4.2.4 Total Assembly line should be check whether the color coordinate(x,y) data refer to below table were meet or not.
Color
Temperature
Cool 9,300k ° K
X=0.283 (±0.015)
Y=0.298 (±0.015)
<Test Signal>
Inner pattern
(255gray,100IRE)
Warm 6,500k ° K
X=0.313 (±0.015)
Y=0.329 (±0.015)
Luminance
(cd/
㎡
)
Cool
Min : 150

120
<Test Signal>
Inner pattern
(255gray,100IRE) Warm
Min : 250

200
*Note : x,y coordinates are drifted about 0.007 after 30 mins heat-run. So checking color coordinate within 5-min at total
assembly line, consider x,y coordinates might be up to 0.007 than x,y target of each color temperature. ..
*Note :
Manual W/B process