LG 22MT47A, Руководство по обслуживанию

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Only for training and service purposes
4.1.5. Adj. method
*Auto WB calibration
1) Set TV in ADJ mode using P-ONLY key (or POWER ON
key)
2) Place optical probe on the center of the display
- It need to check probe condition of zero calibration
before adjustment.
3) Connect RS-232C Cable
4) Select mode in ADJ Program and begin a adjustment.
5) When WB adjustment is completed with OK message,
check adjustment status of pre-set mode (Cool, Medium,
Warm)
6) Remove probe and RS-232C cable.
▪ W/B Adj. must begin as start command “wb 00 00” , and fin -
ish as end command “wb 00 ff”, and Adj. offset if need.
* LED White balance table
If Model is Polaris Model, G-gain fix is applied.
(1) Cool Mode
1) Purpose : Especially G-gain fix adjust leads to the lu -
minance enhancement. Adjust the color temperature
to reduce the deviation of the module color tempera-
ture.
2) Principle : To adjust the white balance without the
saturation, Adjust the G gain more than 172 ( If R
gain or G gain is more than 255 , G gain can adjust
less than 172 ) and change the others ( R/B Gain ).
3) Adjustment mode : mode – Cool
(2) Medium / Warm Mode
1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
2) Principle : To adjust the white balance without the
saturation, Fix the one of R/G/B gain to 192 (default
data) and decrease the others.
3)Adjustment mode : Two modes – Medium / Warm
4.1.6 Reference
(White Balance Adj. coordinate and color temperature)
1) Luminance: 204 Gray, 80IRE
2) Standard color coordinate and temperature using CS-1000
(over 26 inch)
4.1.7. Reference
(White Balance Adj. coordinate and color temperature)
* The spec of color temperature and coordinate.
*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.
5. Tool Option selection
▪ Method : Press "ADJ" key on the Adjustment remote control,
then select Tool option.
6. Ship-out mode check(In-stop)
▪ After final inspection, press "IN-STOP" key of the Adjustment
remote control and check that the unit goes to Stand-by
mode.
7. GND and Hi-pot
7.1. GND & HI-POT auto-check preparation
1) Check the POWER CABLE and SIGNAL CABE insertion
condition
7.2. GND & HI-POT auto-check
1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
2) Connect the AV JACK Tester.
3) Controller (GWS103-4) on.
4) GND Test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, execute next process (Hi-pot test).
(Remove A/V CORD from A/V JACK BOX)
5) HI-POT test (Auto)
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next
process automatically.
7.3. Checkpoint
1) Test voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
2) TEST time: 1 second
3) TEST POINT
- GND Test = POWER CORD GND and SIGNAL CA-
BLE GND.
- Hi-pot Test = POWER CORD GND and LIVE & NEU-
TRAL.
4) LEAKAGE CURRENT: At 0.5mArms
8. Audio
Measurement condition:
1) RF input: Mono, 1 KHz sine wave signal, 100 % Modulation
2) CVBS, Component: 1 KHz sine wave signal 0.5 Vrms
3) RGB PC: 1 KHz sine wave signal 0.7 Vrms
Color
Temperature
Cool 9,300K °K x= 0.291 (±0.04)
y= 0.294 (±0.04)
<Test Signal>
- Inner pattern
for W/B adjust
- External white
pattern
(80IRE, 204gray)
Medium 8,000K °K x= 0.300 (±0.04)
y= 0.310 (±0.04)
Warm 6,500K °K x= 0.318 (±0.04)
y= 0.334 (±0.04)
Luminance
(cd/m²)
Cool Min : 80 Typ : 110 <Test Signal>
Inner pattern
(204gray,80IRE)
Medium Min : 80 Typ : 110
Warm Min : 70 Typ : 110
No. Item Min Typ Max Unit Remark
1
Audio practical
max Output, L/R
(Distortion=10%
max Output)
4.5 5.0 6.0
W
Vrms
(1) Measurement condition
- EQ/AVL/Clear Voice: Off
(2) Speaker(8Ω Impedance)