LG 84LM9600 (CHASSIS:LB23J) Service Manual ▷ View online
Checking method:
1. Check the signal strength or check whether the screen is normal when the external device is connected.
2. After measuring each voltage from power supply, finally replace the MAIN BOARD.
TUNER checking part
A. Video error_Video error, video lag/stop
<ALL MODELS>
A9
Established
date
Revised
date
Error
symptom
Content
LCD TV
2010. 12 .14
Standard Repair Process Detail Technical Manual
Adjustment Test pattern - ADJ Key
A. Video error_Color error
You can view 6 types of patterns using the ADJ Key
Checking item : 1. Defective pixel 2. Residual image 3. MODULE error (ADD-BAR,SCAN BAR..)
4.Video error (Classification of MODULE or Main-B/D!)
A12
Established
date
Revised
date
Error
symptom
Content
LCD TV
2010. 12 .14
Standard Repair Process Detail Technical Manual
Check front display LED
B. Power error _No power
A17
Established
date
Revised
date
Error
symptom
Content
LCD TV
ST-BY condition: Red
Power ON condition: white
Front LED control :
Menu Option Power Indicator
Standby light ON
2010. 12 .14
Standard Repair Process Detail Technical Manual
Check power input voltage and ST-BY 5V
B. Power error _No power
A18
Established
date
Revised
date
Error
symptom
Content
LCD TV
For ’10 models, there is no voltage out for st
-by purpose.
When st-by, only 3.5V is normally on.
Check the DC 20V/24V, 12V, 3.5V.
Edge LED
2010. 12 .14
Edge LED
24 Pin
(Power Board ↔ Main Board) – Common
SMAW200-H24S (YEONHO)
1
Power on
2
24V
3
24V
4
24V
5
GND
6
GND
7
GND
8
GND
9
3.5V
10
3.5V
11
3.5V
12
3.5V
13
GND
14
GND
15
GND
16
GND
17
12V
18
Inverter On/off
19
12V
20
Lamp : A-Dim
LED : N.C
21
12V
22
PWM Dim #1
23
GND/P_DIM2
• Lamp SCANNING Model
: PWM Dim #2
: PWM Dim #2
24
Error-out
Standard Repair Process Detail Technical Manual
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