LG 42LN51XX / 42LN5100 / 42LN5110 / 42LN5120 / 42LN5130 (CHASSIS:LB35B) Service Manual ▷ View online
THERMAL
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
POWER
PWM_DIM
+3.5V_ST
+3.5V_ST
R714
1K
1K
R729
1K
+1.2V_VDDC
C744
0.1uF
16V
0.1uF
16V
+3.5V_ST
C761
0.1uF
16V
0.1uF
16V
C742
10uF
6.3V
10uF
6.3V
C745
10uF
6.3V
10uF
6.3V
+1.8V_M
R710
100
100
R742
1
C752
0.1uF
16V
0.1uF
C702
16V
PANEL_VCC
C707
0.1uF
50V
PANEL_ON
R747
10K
10K
INV_ON
R749
2.2K
2.2K
POWER_SW
+24V_AMP
+3.3V_M
P_12V
Q720
AO3407A
G
D
S
C741
0.1uF
16V
0.1uF
16V
+3.3V_M
L750
BLM18PG121SN1D
Q721
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
RL_ON
R744
10K
P_12V
+3.5V_ST
C750
0.1uF
16V
+3.3V_M
IC701
MP20051
3
FB
2
OUT_2
4
GND
1
OUT_1
5
EN
6
NC
7
IN_1
8
IN_2
9
[EP]GND
R766
4.7K
OPT
C743
10uF
6.3V
10uF
6.3V
C740
10uF
6.3V
10uF
6.3V
C754
10uF
6.3V
Q722
MMBT3906(NXP)
E
B
C
Q710
AO3435
G
D
S
R762
5.6K
R761
33K
Q711
MMBT3904(NXP)
MMBT3904(NXP)
E
B
C
C777
10uF
10V
10uF
10V
OPT
P_12V
+3.3V_M
C773
0.1uF
16V
0.1uF
16V
R771
33
IC709
MP1497DJ
3
SW
2
IN
4
GND
1
SS
5
BST
6
EN
7
VCC
8
FB
C775
0.1uF
16V
0.1uF
16V
C774
0.1uF
R778
47K
47K
C771
1uF
25V
1uF
25V
R777
100K
C770
10uF
16V
10uF
16V
0.1uF
C705
16V
C772
0.1uF
16V
0.1uF
16V
L771
6.8uH
NR8040T4R7N
R770
43K
1%
R772
8.2K
1%
R765
3.3K
+5V_USB
C776
22uF
10V
22uF
10V
L701
120
L702
120
L703
120
L770
120
L761
120
R748
33K
33K
R740
2.7K
2.7K
1%
R741
4.7K
1%
IC711
AP1117E18G-13
2
OUT
3
IN
1
ADJ/GND
+3.5V_ST
R716
10K
10K
R715
10K
10K
Q703
MMBT3904(NXP)
E
B
C
P701
SMAW200-H18S1
14
12V
9
24V
4
P-DIM
18
GND
13
12V
8
GND
3
3.5V
17
GND
12
GND
7
GND
2
DRV_ON
16
NC
11
GND
6
P-DIM2
1
PWR_ON
15
12V
10
24V
5
3.5V
19
.
C760
4.7uF
16V
4.7uF
16V
R750
10K
READY
JP708
JP709
JP710
JP711
C753
4.7uF
10V
4.7uF
10V
ZD701
20V
READY
ZD702
SD05
7 7
POWER
LB35B/LC35B/LL35B
32LN5100
2012/11/15
EAX65027101
** Switch Panel-Vcc
R1
** +3.5V_ST -> 3.3V_M
R2
** 3.5V_ST -> 1.26V VDDC
OUT:1.26V
FROM LIPS & POWER B/D
V0 = 0.8*(1+(R2/R1))
** 3.3V_M -> 1.8V_M
3A
OUT:5V
**12V->USB 5V
Closed IC709
R2
Closed IC709
R1
V0 = 0.8*(1+(R1/R2))
** Jig Point_GND
1 / 36
Normal
audio
Y
N
Move to No
video/No audio
No video
Normal audio
Check Back Light
On with naked eye
On
Y
N
Check Power Board
24v, 12v,3.5v etc.
Normal
voltage
Y
N
Replace T-con Board
or module
Repair Power Board
or parts
Check Power Board 93.2~118.5V
v output
Normal
voltage
Y
Replace Inverter
or module
N
Repair Power
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※
Precaution
Established
date
Standard Repair Process
Revised date
1/14
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
☞A4
☞A1
☞A2
☞A6 & A3
First of all, Check whether all of cables between board is inserted properly or not.
(Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,)
2013. 01 .24
2 / 36
Normal
voltage?
Check various voltages
of Power Board
( 3.5V,12V,20V or 24V…)
No Video/
No audio
Check and
replace
MAIN B/D
Y
Replace Power
Board and repair
parts
N
End
Standard Repair Process
A. Video error
No video/ No audio
☞A4
Established
date
Revised date
2/14
LCD TV
Error
symptom
2013. 01 .24
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