LG 22LN45XX / 22LN4500 (CHASSIS:LJ31A) Service Manual ▷ View online
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4.3. Function Check
4.3.1. Check display and sound
■ Check Input and Signal items. (cf. work instructions)
1) TV
2) AV (SCART/CVBS)
3) COMPONENT (480i)
4) RGB(PC : 1366 x 768 @ 60Hz)
5) HDMI(PC : 1366 x 768 @ 60Hz)
6) PC Audio In
* Display and Sound check is executed by Remote control
* Caution : Not to push the INSTOP KEY after completion if
the function inspection.
4.3.2. PIP Check
(1) Press “Power on” key of service remote control.
(2) Input RGB & TV(ATV or DTV) signal.
(3) Set Input mode to RGB.
(4) Press ‘PIP” key of ADJ remote control
(5) Check TV Video & Audio signal of Sub picture.
4.3.3. HDMI MHL function Inspection(HDMI2 port only)
(1) Insert HDMI cable for MHL function JIG connected to
HDMI2 port of the SET.
(2) Check that LED of JIG is green light and check that set
screen is correctly worked.
(3) If NG situation or other HDMI jack connection, LED of JIG
is red light and screen is not displayed.
4.4. White balance adjustment
- Equipment
(1) Color Analyzer: CA-210 (LED Module : CH 14)
(2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
(3) Adjust Remote control
RGB Gains are fixed data for each model.
Insert RS-232C Jack which is connected with PC for White
Balance or equivalent device.
→ Total Assembly line should be check whether the color
coordinate(x,y) data refer to below table were meet or not.
- Cool Panel
* 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 using adjusts Remote control.
1) After enter Service Mode by pushing "ADJ" key,
2) Enter "White Balance" by pushing "►" key at "White
Balance".
* When doing Adjustment, Please make circumstance as
below.
MHL Function JIG(OK)
MHL Function JIG(NG)
Color
Temperature
Cool
13,000
K X=0.276 (±0.03)
Y=0.275 (±0.03)
<Test Signal>
Inner pattern
(204gray,80IRE)
Medium
9,300
K X=0.290 (±0.03)
Y=0.298 (±0.03)
Warm
6,500
K X=0.318 (±0.03)
Y=0.334 (±0.03)
Luminance
(cd/m²)
Cool
Min : 80
K Typ : 110
<Test Signal>
Inner pattern
(204gray,80IRE)
Medium Min : 80
K Typ : 110
Warm
Min : 70
K Typ : 110
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option6
6. Country Group
7. Area Option
8. ADC Calibration
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option6
6. Country Group
7. Area Option
8. ADC Calibration
9. White Balance
10. 10 Point WB
11. Test Pattern
12 EDID D/L
13. Sub B/C
14. Touch Sensitivity Setting
15. Ext. Input Adjust
16. SPK Lipsync Adjust
17.SPDIF Lipsync Adjust
11. Test Pattern
12 EDID D/L
13. Sub B/C
14. Touch Sensitivity Setting
15. Ext. Input Adjust
16. SPK Lipsync Adjust
17.SPDIF Lipsync Adjust
Whit Balance
Color Temp.
◄
►
R-Gain
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset
To Set
Cool
100
104
192
104
192
64
64
64
64
64
ON
100
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4.5. DPM Operation check
■ Measurement Condition: 100-240V@ 50/60Hz
(1) Set Input to RGB-PC and connect D-sub cable to set -
RGB Mode.
Set Input to HDMI(with Input Label set to PC) and connect
HDMI cable to set - HDMI Mode
(2) Cut off H sync or V sync of signal.
(3) Check DPM operation refer to the below table.
■ HDMI DPM Operating condition
- Input Label: HDMI (PC&DVI Mode)
4.6. Model name & SW version & Adjust check
* Press the ‘Instart’ key of ADJ remote control.
4.6.1. Model Name& SW Version Check
(1) Check ‘Model Name’.
(2) Check ‘S/W Version’ (Refer to the IC Ver. in the BOM)
4.6.2. Adjust Check
(1) Check ‘Country Group’
(2) Check ‘Area Option’
(3) Check ‘Tool Option’ (Refer to the BOM Comments)
(4) Check ‘Adjust ADC[Comp&RGB]’ is OK.
(5) Check ‘EDID[RGB&HDMI]’ is OK.
* After check all, Press the 'EXIT' key of ADJ remote control to
go out SVC menu.
4.7. Outgoing condition Configuration
* After all function test, press IN-STOP key by SVC Remote
control. And make Outgoing Condition.
Operating Condition
Sync(H/V) Video LED(SET) Wattage(W)
Power S/W On Sleep mode -
RGB, HDMI
Off/Off
Off
Amber
1
MHL Cable
HDMI & HDMI to DVI Cable
DPM
X
O
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TROUBLE SHOOTING
1. No Power
Check C820 All
Voltage Level (19V)
Check Power connector
OK ?
Replace Adapter
N
N
Check IC802 output
Voltage Level (12V)
Replace IC802 &
Recheck
N
Check IC809 Output
Voltage Level (3.3V_ST)
Replace IC809
N
Y
Check IC810 Output
Voltage Level (2.5V)
Replace IC810
N
Y
Y
Y
Y
Check IC807 Output
Voltage Level (1.5V)
Replace IC807
N
Y
Check IC806 Output
Voltage Level (1.15V)
Replace IC806
N
Check X201 Clock
24MHz
Replace X201
N
Replace IC100 Flash Memory
Y
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2. No Picture
Module
Back Light On ?
Check WLED_ENABLE high
R131
Check IC101
Replace Main Scaler IC
N
N
Check Panel clock
P601(#9,10)
Check IC101
Repair Main B/D
N
Check Panel power
P601(#27,28,29,30) 12V
IC804Output 12V
Replace IC804
N
Y
Replace T-con
Board or module
Check FFC Cable for damage
or open conductors.
Replace Cable
N
Y
Y
Y
Check LED Driver output
(LED Driver B’d P1101
#1,2,3,4,9,10,11,12)
Check LED Driver IC1100
Replace LED Driver IC
N
Y
3. No Video - Digital TV
Check RF Cable
Check Tuner(TU2603)
Data, CLK, SYN, VAL
Replace Tuner(TU2603)
Recheck
Y
N
1. Check Tuner(TU2603 #5) Power (3.3V)
2. Check IC803 Output voltage(3.3V)
Replace IC803
Y
N
Check Tuner(TU2602) I2C Signal
SCL(R3735), SDA(R3736)
Check IC101
Y
N
1. Check Tuner(TU2602 #7) Power (1.8V)
2. Check IC805 Output voltage(1.8V)
Replace IC805
Y
N
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