LG 32LH30FD (CHASSIS:LT91A) Service Manual ▷ View online
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.
0
32"UP_IR_KEY
R980
BLM18PG121SN1D
L957
AMOTECH
5.6V
D956
12507WS-12L
EAG58732902
32"UP_IR_KEY
P953
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
5V_ST
7
GND
8
WARM_ST
9
IR
10
GND
11
3.3V
12
PWR_ON
13
BLM18PG121SN1D
32"UP_IR_KEY
L953
5.6V
26"UNDER_IR
D952
0 . 1 u F
32"UP_IR_KEY
C976
0 . 1 u F
32"UP_IR_KEY
C971
26"UNDER_KEY
L952
26"UNDER_IR
L956
AMOTECH
5.6V
26"UNDER_KEY
D954
5.6V
26"UNDER_IR
D951
26"UNDER_IR
L955
0 . 1 u F
16V
C975
IR
KEY2
0 . 1 u F
16V
32"UP_IR_KEY
C980
AMOTECH
5.6V
32"UP_IR_KEY
D955
AMOTECH
5.6V
32"UP_IR_KEY
D958
26"UNDER_KEY
L954
32"UP_IR_KEY
L951
5.6V
D959
0
R978
32"UP_IR_KEY
1000pF
50V
C978
4.7K
R973
+3.3V_ST
100
R972
KEY1
0 . 1 u F
16V
16V
26"UNDER_KEY
C972
0
OPT
R979
1000pF
50V
32"UP_IR_KEY
C981
1000pF
26"UNDER_IR
C973
AMOTECH
5.6V
26"UNDER_KEY
D953
SUB/AMP_SDA
SUB/AMP_SCL
4.7K
R974
BLM18PG121SN1D
32"UP_IR_KEY
L958
5.6V
D957
100pF
50V
C979
+5V_ST
POWER_ON/RL_ON
0 . 1 u F
16V
16V
26"UNDER_KEY
C977
100
R971
1000pF
26"UNDER_IR
C974
BLM18PG121SN1D
L959
+3.3V
12507WS-08L
EAG58732904
26"UNDER_IR
P951
1
KEY1
2
KEY2
3
GND
4
5V_ST
5
GND
6
IR
7
LED_B
8
LED_R
9
.
2SC3052
OPT
Q910
E
B
C
47K
OPT
R985
2SC3052
OPT
Q911
E
B
C
10K
OPT
R983
22
OPT
R981
+5V_ST
47K
OPT
R982
+5V_ST
IR_OUT
47K
OPT
R984
0 . 1 u F
16V
C982
32"UP_IR_KEY
10K
R986
32"UP_IR_KEY
12507WR-03L
26"UNDER_KEY
P952
1
KEY1
2
KEY2
3
GND
4
0
OPT
R920
LED_G_SUB
LED_ON/LED_R
LED_G
LED_ON/LED_R
MDS61887701
SMD GASKET-LVDS
M1
MDS61887701
SMD GASKET-MEMORY1
M2
MDS61887701 SMD GASKET-MEMORY2
M3
100
R975
32"UP_IR_KEY
100
R976
32"UP_IR_KEY
IR
11
10
CONTROL & IR & LED
EAX60838501_MERCURY
Taiwan_LH20/LH30
EAX60838501
2 0 0 9 . 0 2 . 1 0
LGE Use Only
Contents of LCD TV Standard Repair Process
No.
Error symptom (High category)
Error symptom (Mid category)
Page
Remarks
1
A. Video error
No video/Normal audio
1
2
No video/No audio
2
3
Video error, video lag/stop
3
4
Color error
4
5
Vertical/Horizontal bar, residual image,
light spot, external device color error
light spot, external device color error
5
6
B. Power error
No power
6
7
Off when on, off while viewing, power auto
on/off
on/off
7
8
C. Audio error
No audio/Normal video
8
9
Wrecked audio/discontinuation/noise
9
10
D. Function error
No response in remote controller, key error,
recording error, memory error
recording error, memory error
10
11
External device recognition error
11
12
E. Noise
Circuit noise, mechanical noise
12
13
F. Exterior error
Exterior defect
13
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Normal
audio
Y
N
Move to No
video/No audio
video/No audio
No video
Normal audio
Normal audio
Check Back Light
On with naked eye
On with naked eye
On
Y
N
Check Power
Board
12v,5v etc.
Board
12v,5v etc.
Normal
voltage
Y
N
Replace Main Board
Replace T-con
Board or module
And Adjust VCOM
Board or module
And Adjust VCOM
OR
Repair Power
Board or parts
Board or parts
Check Power Board 20V /12V or 24v output
Normal
voltage
voltage
Y
Replace Inverter
or module
or module
N
Repair Power
Board or parts
Board or parts
End
Always check & record S/W Version and White
Balance value before replacing the Main Board
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
※Precaution
Established
date
Electronics 6-3
Standard Repair Process
Revised date
2008. 3 .05
1/13
LCD TV
Error
symptom
A. Video error
No video/ Normal audio
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,,,)
1
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