LG 55LH80YD (CHASSIS:LB91F) 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.
D3.3V_1
C746
0.1uF
0.1uF
C750
22uF
16V
P6.0V
L727
BLM18PG121SN1D
OPT
D3.3V_EN
003:F3
L716
CB3216PA501E
0.1uF
C793
C791
22uF
22uF
16V
R724
10
1%
R738
10K
10K
P6.0V
L726
3.6uH
NR8040T3R6N
R723
22K
1%
22K
1%
R722
75K
1%
C788
1uF
16V
C792
22uF
16V
C787
22uF
22uF
OPT
C790
0.1uF
0.1uF
16V OPT
D3.3V_1
R736
22K
1%
D1.26V_VDDC
C786
22uF
R731
10K
OPT
C789
10nF
50V
L711
CB3216PA501E
D3.3V_L
C710
0.1uF
16V
0.1uF
16V
P5.0V_ST
C705
0.1uF
16V
0.1uF
16V
C704
10uF
10V
10uF
10V
IC702
AP1117E33G-13
NEW
2
OUT
3
IN
1
ADJ/GND
C708
10uF
10uF
6.3V
R742
47
IC705
MP2212DN
NEW
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
L724
CB3216PA501E
L717
BLM18PG121SN1D
R733
10K
OPT
C732
22uF
22uF
16V
C733
22uF
OPT
D700
100V
1N4148W_DIODES
OPT
R770
56K
1%
56K
1%
R769
18K
1%
18K
1%
L710
3.6uH
NR8040T3R6N
L720
BLM18PG121SN1D
R737
47
C741
10nF
50V
IC704
MP2212DN
NEW
3
IN
2
GND
4
BS
1
FB
5
VCC
6
SW_1
7
SW_2
8
EN/SYNC
R734
10
1/10W
1%
C751
10uF
6.3V
C714
22uF
22uF
16V
D3.3V_1
D1.8V_DDR
L702
BLM18PG121SN1D
R710
10K
10K
R712
9.1K
9.1K
1%
IC701
SC4215ISTRT
3
VIN
2
EN
4
NC_2
1
NC_1
5
NC_3
6
VO
7
ADJ
8
GND
R711
12K
1%
C713
0.1uF
16V
0.1uF
16V
C712
10uF
10uF
10V
C715
0.1uF
16V
0.1uF
16V
C737
1uF
10V
D703
100V
1N4148W_DIODES
OPT
GND
GND
R756
100
GND
GND
GND
P6.0V
C709
100uF
16V
16V
C706
10uF
16V
16V
OPT
C703
100uF
16V
16V
C701
0.1uF
16V
0.1uF
16V
P3.3V
C707
0.1uF
16V
0.1uF
16V
R700
1K
1K
OPT
PWR_CTRL
003:F3
C702
100uF
16V
16V
P5.0V_ST
C700
0.1uF
16V
0.1uF
16V
R704
47K
47K
C720
10uF
OPT
10uF
OPT
Q701
SI4925BDY
3
S2
2
G1
4
G2
1
S1
5
D2_1
6
D2_2
7
D1_1
8
D1_2
L700
CB3216UA121
OPT
WIHD_PWR_EN
003:F2
D5.0V_W
R703
10K
C721
0.1uF
16V
0.1uF
16V
R705
2.7K
2.7K
P5.0V_ST
Q700
2SC3052
2SC3052
E
B
C
L701
CB3216UA121
R702
120K
120K
C722
OPT
8.0PI
C719
0.1uF
16V
0.1uF
16V
IC700
BA50BC0WFP-E2
1
CTL
2
VCC
3
GND
4
OUT
5
NC
P6.0V
C716
0.1uF
16V
0.1uF
16V
R701
1K
1K
D5.0V_1
C718
100uF
16V
16V
C711
100uF
16V
16V
C723
47uF
16V
16V
C724
0.1uF
16V
0.1uF
16V
C725
47uF
16V
16V
C726
0.1uF
16V
0.1uF
16V
D3.3V_2
D1.8V_1
IC703
AP1117E18G-13
NEW
2
OUT
3
IN
1
ADJ/GND
R771
3.9K
GND
P3.3V
D701
SML-201MT
SML-201MT
D3.3V_2
C731
0.01uF
50V
0.01uF
50V
L705
CB3216UA121
C729
10pF
50V
10pF
50V
C735
47uF
16V
16V
R706
1K
C730
0.1uF
16V
0.1uF
16V
L704
CB3216UA121
C734
4.7uF
6.3V
4.7uF
6.3V
D704
SML-512UW
SML-512UW
OPT
D3.3V_AVDD_MPLL
C717
0.1uF
16V
0.1uF
16V
L703
BLM18PG121SN1D
D3.3V_1
R772
4.7K
C753
0.1uF
16V
0.1uF
16V
D3.3V_3
C754
10uF
10uF
6.3V
IC706
AP1117E33G-13
NEW
2
OUT
3
IN
1
ADJ/GND
C755
0.1uF
16V
0.1uF
16V
C752
10uF
10V
10uF
10V
P6.0V
D705
ENKMC2838-T112
A1
C
A2
P700
SMW250-16P
13
GND
10
+5.0V_ST
3
+6.0V
14
GND
7
+3.3V
4
+6.0V
11
+5.0V_ST
8
+3.3V
1
PWR_CTRL
15
GND
12
+5.0V_ST
5
GND
2
+6.0V
16
GND
9
GND
6
GND
465 mA @85% efficiency
$0.24
Placed on SMD-TOP
C OUT
MAX 3A
1600 mA
R1
4.9A 0.0150OHM 34MHZ
3A, DCR=0.025 ohm
Replaced Part
Placed on SMD-TOP
Close to IC
$0.07
Close to IC
Vout=0.8*(1+R1/R2)
R2
C IN
Replaced Part
R1
R2
Close to IC
Vout=0.8*(1+R1/R2)
Placed on SMD-TOP
+1.8V for Saturn6 DDR
R1/R2 : 27K / 20K => Vout=1.88
R1/R2 : 12K / 9.1K => Vout=1.85
R1/R2 : 15K / 12K => Vout=1.80
+1.26 Core for Saturn6
Stand-by +3.3V
6
D
E
F
A
G
C
H
1
2
3
B
4
5
JUNO-BOX
081226
POWER
10
10
POWER CONNECTOR
+5.0V For USB & Etc
+1.8V For HDMI TX
POWER SUPPLY
Switch for +5.0V (WIRELESS)
+3.3V
Replaced Part
+3.3V For TMDS Switch
EAX60902801(0)_AUS_JUNO_AVBOX
Trouble shooting Guide
WIRELESS LH80
LCD TV Research Lab
R&D 3 Dept / AJ Gr.
R&D 3 Dept / AJ Gr.
LG ELECTRONICS INC.
Trouble shooting: p2 - p6
About Wireless TV: p7 – p10
Block Diagram: p11 – p16
INPUT
MAIN IC
AV
Component
HDMI
RGB
Component
HDMI
RGB
LGE3159
Analog
Digital
WIRELESS MODEL
SIGNAL
CONVERTER
DTC30LM36 +
SIL9134
SIL9134
LVDS
MEDIA-BOX
TX MODULE
HDMI
SIL9125 +
SB9120 +
SB9110
SB9120 +
SB9110
RX MODULE
SB9111 +
SB9121 +
SIL9134
SB9121 +
SIL9134
MAIN IC
LCD
MODULE
LGE3369 +
LGE7329
LGE7329
LGD V4
LVDS
Wireless
TV SET
HDMI
a
b
c
d
e
f
g
WIRELESS LH80
Service
only
HDMI JACK
HDMI5
HDMI JACK
Wired
HDMI CABLE
▶ Check main ic basic power & power
sequence
▶ Control line check (I2C & etc)
▶ Check input/output video & audio
▶ Check input/output video & audio
signal
No effect directly
No effect directly
No connection
Bad image
- IC’s cold soldering or memory defect accompanied noise on osd
Bad sound / No sound
Wireless connecting osd is displayed continually
Wireless connecting osd is displayed continually
- There is no video signal from Rx module to TV main ic, so TV
understand this time like disconnection state and display
connecting
osd continually. And then, if TV is not activated rightly within
15min,
it will go to st-by mode.
b
▶ Check power & control line
▶ Check input/output signal
▶ Check inner HDMI cable connection
▶ Check input/output signal
▶ Check inner HDMI cable connection
status
(There can be cable’s defect.)
No effect directly
No connection
No connection
Bad image / Bad or No sound
Wireless connecting osd is displayed continually
Wireless connecting osd is displayed continually
- No image
C
No effect directly
Wireless connection
▶ Check the EDID of HDMI & RGB
▶ Check cable & contact error
▶ Check cable & contact error
Bad (noise) image / No image
- osd is good
Bad sound / No sound
a
Check
Symptoms
Defect block
Trouble shooting
OSD
OSD
＊Focused on Wireless connection
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