LG 24BL450Y User manual

P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
P/NO : MFL69406860 (1903-REV00)
LED LCD MONITOR
SERVICE MANUAL
LM9FS
24BL450Y
CONFIDENTIAL

- 2 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
CONTENTS
CONTENTS ........................................................................................................................................................ - 2 -
SAFETY PRECAUTIONS................................................................................................................................... - 3 -
SPECIFICATION ................................................................................................................................................ - 4 -
BLOCK DIAGRAM.............................................................................................................................................. - 7 -
EXPLODED VIEW .............................................................................................................................................. - 8 -
DISASSEMBLY .................................................................................................................................................. - 9 -
TROUBLE SHOOTING GUIDE ........................................................................................................................ - 12 -

SAFETY PRECAUTIONS
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 modif
y
the ori
g
inal desi
g
n without
p
ermission of manufacturer.
IMPORTANT SAFETY NOTICE
General Guidance An other abnormality exists that must be corrected before the
receiver is returned to the customer.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
Leakage Current Hot Check (See below Figure)
power line. Use a transformer of adequate power rating as this
Plug the AC cord directly into the AC outlet.protects the technician from accidents resulting in personal injury
from electrical shocks.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitorIt will also protect the receiver and it's components from being
between a known good earth ground (Water Pipe, Conduit, etc.)damaged by accidental shorts of the circuitry that may be
and the exposed metallic parts.inadvertently introduced during the service operation.
Measure the AC voltage across the resistor using AC voltmeterIf any fuse (or Fusible Resistor) in this TV receiver is blown,
with 1000 ohms/volt or more sensitivity.replace it with the specified.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltageWhen replacing a high wattage resistor (Oxide Metal Film Resistor,
measured must not exceed 0.75 volt RMS which is corresponds toover 1 W), keep the resistor 10 mm away from PCB.
0.5 mA.Keep wires away from high voltage or high temperature parts.
In case any measurement is out of the limits specified, there is
Before returning the receiver to the customer, possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
Leakage Current Hot Check circuit
be sure the set is safe to operate without damage of electrical
shock.
- 3 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
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. When 25A is impressed between Earth and 2nd Ground
If the exposed metallic part has a return path to the chassis, the for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard
measured resistance should be between 1 MΩand 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.

SPECIFICATION
- 4 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
1. General Specification
No
Item
Content
Remark
1
Customer
BRAND
2
User Model Name
22/24/27BL450
3
Sale region
Refer to Suffix standard
4
Feature
22/24/27”FHD LCD MONITOR
5
Chassis Name
LM9FS
6
General
Scope
External SW
&Adj.
5way Jostick key
Function
OSD,DDC2B,DDC2AB, HDCP, OSD Lock, Ratio, Smart Energy
Saving, Color Weakness, SUPER RESOLUTION+, Black
Level, Black
Stabilizer, OnScreen Control
7
Input &
Output
HDMI IN
Length : 1.8m±0.05m / Shape : Detachable Type / Color : Black /
Weight : 0.091kg±10%
CABLE : 100Ω±10Ω
CONNECTOR : 100Ω±15Ω
DVI IN
-
DP IN
Length : 1.8m±0.05m / Shape : Detachable Type / Color : Black /
Weight : 0.091kg±10%
D_SUBIN
-
AUDIO IN
-
HP OUT
Audio L/R OUT
Speaker
Speaker L/R(1.2W Setting)
USB
1UP, 2Down
8
Power cord
-
Refer to Suffix
standard and power
cord table
9
Cable
Signal Cable
(DP)
Length : 1.8m
Shape : Detachable Type
Color : Black
Pin : Triple Row, 20 Pin DP
Refer to Suffix
standard
Signal Cable
(HDMI)
Length : 1.8m
Shape : Detachable Type
Color : Black
Pin : 19Pin HDMI
Refer to Suffix
standard
10
Power
22/24BL450Y
Output: DC 19V 1.3A, 24W Adapter
Color: Black, Weight : 154g ±10%, without vinyl bag
27BL450Y
Output: DC 19V 1.7A, 32W Adapter
Color: Black, Weight : 160g ±10%, without vinyl bag
adapter

- 5 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
6. Signal Timing (Resolution)
< HDMI>
1) Main Recommended 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)
+
40.0
37.879
1056
800
40
128
88
800 x 600
V(Lines)
+
60.317
628
600
1
4
23
3
H(Pixels)
-
65.0
48.363
1344
1024
24
136
160
1024 x 768
V(Lines)
-
60.0
806
768
3
6
29
4
H(Pixels)
+
74.25
45.0
1650
1280
110
40
220
1280 x 720
V(Lines)
+
60.0
750
720
5
5
20
5
H(Pixels)
-
83.50
49.702
1680
1280
72
128
200
1280 x 800
V(Lines)
+
59.810
831
800
3
6
22
6
H(Pixels)
+
108.0
63.981
1688
1280
48
112
248
1280 x 1024
V(Lines)
+
60.023
1066
1024
1
3
38
7
H(Pixels)
-
146.25
65.290
2240
1680
104
176
280
1680 x 1050
V(Lines)
+
59.954
1089
1050
3
6
30
8
H(Pixels)
+
148.50
67.50
2200
1920
88
44
148
1920 x 1080
11
Set Power Rating
19V 1.3A(22/24BL450Y)
19V 1.6A(27BL450Y)
12
Applying module list
P/N
Specification
CAS
22BL450 LGD
EAJ63849701
LM215WF3-SLS1,FHD
24BL450 LGD
EAJ63909101
LM238WF1-SLK1
27BL450 BOE
EAJ63948301
MV270FHM-N20
13
Speaker
P/N:EAB51749310
Typ:1.2W*1.2W
(except 24BL550J)-

- 6 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
V(Lines)
+
60
1125
1080
4
5
36
9
H(Pixels)
+
174.50
83.894
2080
1920
48
32
80
1920 x 1080
V(Lines)
-
74.973
1119
1080
3
5
31
< DP>
1) Main Recommended 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)
+
40.0
37.879
1056
800
40
128
88
800 x 600
V(Lines)
+
60.317
628
600
1
4
23
3
H(Pixels)
-
65.0
48.363
1344
1024
24
136
160
1024 x 768
V(Lines)
-
60.0
806
768
3
6
29
4
H(Pixels)
+
74.25
45.0
1650
1280
110
40
220
1280 x 720
V(Lines)
+
60.0
750
720
5
5
20
5
H(Pixels)
-
83.50
49.702
1680
1280
72
128
200
1280 x 800
V(Lines)
+
59.810
831
800
3
6
22
6
H(Pixels)
+
108.0
63.981
1688
1280
48
112
248
1280 x 1024
V(Lines)
+
60.023
1066
1024
1
3
38
7
H(Pixels)
-
146.25
65.290
2240
1680
104
176
280
1680 x 1050
V(Lines)
+
59.954
1089
1050
3
6
30
8
H(Pixels)
+
148.50
67.50
2200
1920
88
44
148
1920 x 1080
V(Lines)
+
60
1125
1080
4
5
36
6.1.2 HDMI Video input
Factory support
mode
(Preset Mode)
Horizontal
frequency
(KHz)
Vertical
frequency
(Hz)
HDMI
1
480P
31.5
60
O
2
576P
31.25
50
O
3
720P
37.5
50
O

- 7 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
BLOCK DIAGRAM
RTD2536R
(Realtek)
8M
SERIAL
Flash
LED PANEL
LVDS
PWM_
DIM
F/B
SPI
Data/
CLK
DP_TMDS
Aux
USB2.0
Down Stream
USB2.0
UP Stream
USBGL850G
-33
APA2068
(Anpec)
Audio
IN
Speaker
KEY0/1
WLED_
EN
Crystal
12MHz
RST
Analog Sound(L/R)
2Ch. LDO
Core 1.1V
19V
System 3.3V
3.3V DP
HP
L/R
out
H/P
DP
HDMI
Aux
HDMI-TMDS
KEY0/1
Crystal
14.318MHz

540
or
- 8 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
EXPLODED VIEW
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
120
300 200
500
510
400
900
920
910
330

DISASSEMBLY
Disassembly method
- 9 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
Fig.1 Place the monitor’s screen face down on a soft plane.
Fig.2 use finger or coin to disassemble the stand base,and pull the button down and lift the stand body to disassemble
the Stand body.

- 10 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
Fig 3 use screw driver to release 4 EA screws and disassemble the back cover with jig

- 11 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
Fig 4 release the cables and tapes to disassemble DMS.
Fig 5 Disassemble cabinet and module
Accessories pic:

- 12 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
TROUBLE SHOOTING GUIDE
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
No Power
No Screen on
Replace X201
N
Check JP100
Voltage Level (19V)
Check Power connector
OK ? Replace adapter
Y
N Y
Check IC100 pin3/6 Output
Voltage Level (1.1V, 3.3V)
Replace IC100 &
Recheck
Y
N
Check X201 Clock
14.318MHz
Check IC101 pin16 Output
Voltage Level (5VS)
Replace IC101 &
Recheck
N
Y
Replace IC201 Flash Memory
Y
Replace Cable
N
Module Back Light On? Check IC203
Replace Main Scaler IC
Y
N N
Check Panel Power 5V(JP225)
Check IC101 Output 5V
Replace IC101 &
Recheck
Y
N
Check Panel Clock
P202(#10,11,22,23)
Check IC203
Repair Main B/D
Y
N
Check FFC Cable for Damage
or Open Conductors
Check LED Driver FB
(IC101 5,6,7,8)
Replace T-Con Board or
Module
Y

- 13 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
No Video – HDMI
Replace Main Scaler (IC203)
Check input signal format
Is it supported?
Check JK101,JK102 for
proper connection or
Damage
Replace Connector
Y
N
Check I2C
Signal(JK101,JK102) Re Download EDID Data
Y
N
Y
Check HDMI Cable for
Damage or Open Connector
Y