DOWNLOAD LG 22LN45XX / 22LN4500 (CHASSIS:LJ31A) Service Manual ↓ Size: 5.88 MB | Pages: 30 in PDF or view online for FREE

Model
22LN45XX 22LN4500 (CHASSIS:LJ31A)
Pages
30
Size
5.88 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
22ln45xx-22ln4500-chassis-lj31a.pdf
Date

LG 22LN45XX / 22LN4500 (CHASSIS:LJ31A) Service Manual ▷ View online

- 11 -
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
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
Whit Balance
Color Temp. 
 
R-Gain
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset 
      To Set
Cool
100
104
192
64
64
64
ON
100
- 12 -
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
- 13 -
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
- 14 -
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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