LG 34BR65F User manual

Internal Use Only
P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
(MFL72076701-REV00)
34BR65F
LM20E
IPS LED MONITOR

-2- Copyright © 2020 LG Electronics Inc. All rights reserved.
Only training and service purposes
CONTENTS
CONTENTS .....................................................................................................................................................- 2 -
SAFETY PRECAUTIONS.................................................................................................................................- 3 -
SPECIFICATION..............................................................................................................................................- 4 -
BLOCK DIAGRAM ...........................................................................................................................................- 6 -
EXPLODED VIEW............................................................................................................................................- 7 -
TROUBLE SHOOTING GUIDE ...................................................................................................................... - 8-

-3- Copyright © 2020 LG Electronics Inc. All rights reserved.
Only training and service purposes
SAFETY PRECAUTIONS
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩ and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
When 25A is impressed between Earth and 2nd Ground
for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by△
！in the
Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE

-4- Copyright © 2020 LG Electronics Inc. All rights reserved.
Only training and service purposes
SPECIFICATION
1. General Specification
No
Item
Content
Remark
1
Customer
BRAND
BRAND : LGE Product
2
User Model Name
34WN650,34BN670,34BN670P,34BR65F
3
Sale region
Worldwide
4
Feature
34inch WFHD LCD Monitor
5Chassis Name LM20E spec,PCB,Product
Adjustment spec.
6 General
Scope
External SW &
Adj.
Joystick switch Up / Down / Left / Right / OK (Power) Press and Hold : Power off
Function
Picture Mode, Ratio, S.E.S, Six Color, On Screen Control,
Dual Controller, Factory calibration,
7 Input
HDMI IN
HDMI1,2(1.4)
DP IN
Display Port (1.4)
USB Up
N/A
USB DN
N/A
H/P OUT
Audio L/R
8
Power Cord
Length
1.55±0.05m:
Refer to Suffix standard
and power cord Table.
Weight
101.1g(±10%)
Color
BLACK
DisplayPort
Length
Weight
Color
Impedance
HDMI
Length
1.80m ± 0.05m
Weight
0.07kg ± 10%
Color
BLACK
Impedance
1)CABLE : 100Ω±5Ω
2)CONNECTOR : 100Ω±10Ω
10 Power (Adapter / PSU
/LPB)
Input: 100-240V~ 50/60Hz
Output: DC19V 2.53A 48WAdapter
Color : Black, Weight : 0.25kg±10%, without vinyl bag
P/N : EAY65689004
(Refer to BOM)
11 19V/2.4A Request to regulation team
12
Accessory Box - Not applied
14Applying module list
P/No Specification
34” 21:9 WQHD MODULE
(Refer to BOM)
EAJ65651901
SEM340F0(BD0-M10)
1.8 ± 0.05m
0.17kg ± 10%,
BLACK
N/A
EAJ65652001
EAJ65878101
EAJ65815501
SEM340F0(LD0-M10)
SEM340F0(LD0-M40)
SEM340F0(LD0-M20)
13
Power Rating
Speaker SW

-5- Copyright © 2020 LG Electronics Inc. All rights reserved.
Only training and service purposes
2.Signal Timing (Resolution)
1 H/V Timing
mode section polarity
DOT
CLOCK
[MHz]
Frequency
[kHz]/[Hz]
Total
Period(E)
Display
(A)
Front
Porch
(D)
Sync.
(C)
Back
Porch
(B)
Resolution
1
H(Pixels)
-
25.175
31.469
800
640
16
96
48
640 x 480
V(Lines)
-
59.94
525
480
10
2
33
2
H(Pixels)
-
31.5
37.5
840
640
16
64
120
640 x 480
V(Lines)
-
75
500
480
1
3
16
3
H(Pixels)
+
40.0
37.879
1056
800
40
128
88
800 x 600
V(Lines)
+
60.317
628
600
1
4
23
4
H(Pixels)
+
49.5
46.875
1056
800
16
80
160
800 x 600
V(Lines)
+
75.0
625
600
1
3
21
5
H(Pixels)
-
65.0
48.363
1344
1024
24
136
160
1024 x 768
V(Lines)
-
60.0
806
768
3
6
29
6
H(Pixels)
+
78.75
60.123
1312
1024
16
96
176
1024 x 768
V(Lines)
+
75.029
800
768
1
3
28
7
H(Pixels)
-
81.62
53.697
1520
1152
64
120
184
1152 x 864
V(Lines)
+
60
895
864
1
3
27
8
H(Pixels)
+
74.25
45
1650
1280
110
40
220
1280x720
V(Lines)
+
60
750
720
5
5
20
9
H(Pixels)
+
108
63.981
1688
1280
48
112
248
1280 x1024
V(Lines)
+
60.02
1066
1024
1
3
38
10
H(Pixels)
+
135
79.976
1688
1280
16
144
248
1280 x 1024
V(Lines)
+
75.025
1066
1024
1
3
38
11
H(Pixels)
+
108.0
60.00
1800
1600
24
80
96
1600 x 900
V(Lines)
+
60.00
1000
900
1
3
96
12
H(Pixels)
-
146.25
65.29
2240
1680
104
176
280
1680 x 1050
V(Lines)
+
59.954
1089
1050
3
6
30
13
H(Pixels)
+
148.50
67.50
2200
1920
88
44
148
1920 x 1080
V(Lines)
-
60
1125
1080
4
5
36
14
H(Pixels)
-
181.25
66.636
2720
2560
48
32
80
2560 x 1080
V(Lines)
+
59.98 1111 1080 3 10 18
15
H(Pixels)
-
228.25
83.915
2720
2560
48
32
80
2560 x 1080
V(Lines)
+
74.99 1119 1080 3 10 26
* (1) DP/HDMI Preferred timing /
6.1.2 HDMI Video input
Factory support
mode
Horizontal
frequency
Vertical
frequency
(Preset Mode) (KHz) (Hz)
1
480P
31.5
60
2
576P
31.25
50
3
720P
37.5
50
4
720P
45
60
5
1080P
56.25
50
6
1080P
67.5
60
7
2160P
67.5
30

- 6- Copyright © 2020 LG Electronics Inc. All rights reserved.
Only training and service purposes
BLOCK DIAGRAM
LVDS ( 51pin)
Headphone
(JK700)
HDMI2 (JK100)
LED Driver
(IC 503)
Flash Memory
(IC201)
RTD2556UT
Scaler (IC202)
LED
Control
LED (P503)
34” Only
LVDS ( 41pin)
DC Jack (19V)
DP
(JK102)
Speaker
Audio AMP
(IC700)
From Scaler
HDMI1 (JK101)

EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are
identified by △
!in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as recommended in this
manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
!300!
!
!
200
500
510
400
!
900
!
920
120
330
910
!
540
or

Copyright 2020 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 20 - LGE Internal Use Only
Trouble shooting : No Power
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
No power issue
CHECK JK400 PIN4
YES
YES
YES
YES
YES
IS IC503 PIN15(19V),PIN16(5V)
CHECK ADAPTER
NO
NO
NO
NO
NO
CHECK IC503
CHECK IC408
CHECK IC407
CHECK CRYSTAL X200
IS IC408 PIN3(3.3V)
IS IC407 PIN3(1.15V)
IS IC202 PIN140,PIN141 PULSE
CHECK IC202

Copyright 2020 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 21 - LGE Internal Use Only
Trouble shooting : No Screen on
No Raster(OSD is not
displayed)
CHECK P200 PIN1(5V)
YESYES
YES
YES
NO
NO
NO
CHECK IC503 PIN16(5V)
1.CHECK IC202
2. Trouble in IC202
CHECK IC202 PIN140,PIN141
14.3MHz
CHECK IC202 PIN3,PIN4
SCL/SDA
CHECK CONNECTION
From HDMI to IC202
Trouble in cable or LCD module

Copyright 2020 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 22- LGE Internal Use Only
Trouble shooting :
Trouble in DPM
CHECK the signal input
YES
YES
NO
NO
CHECK PC,PC is going to
the DPM mode
CHECK signal cable DET pin
Trouble in IC202
CHECK signal cable
connection