LG 24BL650C User manual

P/NO : MFL62449386 (1908-REV00)
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
CONFIDENTIAL
LED MONITOR
SERVICE MANUAL
LM8EA
24BL650C 24BL650C-BA
27BL650C 27BL650C-BA
Copyright © 2018 - 2019 LG Electronics Inc. All rights reserved. Only training and service purposes.

- 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 ........................................................................................................................ - 10 -

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
1. General Specification
** Provided accessory: #7/#8
No Item Content Remark
1 Customer BRAND
2 User Model Name BL650
3 Sale region Worldwide
4 Feature BL650 FHDLCD MNT
5 Chassis Name LM9ES
6 General
Scope
External SW
&Adj.
5way Joystick key
Function
OSD,DDC2B,DDC2AB, HDCP, OSD
Lock, Ratio, Smart Energy Saving,
Color Weakness, SUPER
RESOLUTION+, Black Level, Black
Stabilizer, OnScreen Control, USB type-C
Alt mode, USB3.0 downport*2ea
7 Cable
HDMI
Length : 1.8m±0.05m / Shape :
Detachable Type / Color: Black / Weight :
0.091kg± 10%
CABLE : 100Ω±10Ω
CONNECTOR : 100Ω±15Ω
DP N/A
N/A
USB-C type
Length : 1.5m±0.05m / Shape :
Detachable Type / Color: Black / Weight :
0.06kg± 10%
CABLE : 90Ω±10Ω
CONNECTOR : 90Ω±10Ω
8 Power Adapter P/N: EAY63032209
Output : 110W
9 Applying module list
-. 24BL650 LGD
P/N: EAJ64450101
Module Name: LM238WF2-SSK1
-. 27BL650 LGD
P/N: EAJ62507601
Module Name: LM270WF7
Refer to Suffix standard
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Only training and service purposes

- 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) +
27
31.47 848 720 16 62 50
720 x 480
V(Lines) + 59.94 528 480 9 9 30
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) -
65.0
48.363 1344 1024 24 136 160
1024 x 768
V(Lines) - 60.0 806 768 3 6 29
5
H(Pixels) +
74.25
45.0 1650 1280 110 40 220
1280 x 720
V(Lines) + 60.0 750 720 5 5 20
6
H(Pixels) -
83.50
49.702 1680 1280 72 128 200
1280 x 800
V(Lines) + 59.810 831 800 3 6 22
7
H(Pixels) +
108.0
63.981 1688 1280 48 112 248
1280 x 1024
V(Lines) + 60.023 1066 1024 1 3 38
8
H(Pixels) -
146.25
65.290 2240 1680 104 176 280
1680 x 1050
V(Lines) + 59.954 1089 1050 3 6 30
9
H(Pixels) +
148.50
67.50 2200 1920 88 44 148
1920 x 1080
V(Lines) + 60 1125 1080 4 5 36
10
H(Pixels) +
174.50
83.894 2080 1920 48 32 80
1920 x1080
V(Lines) - 74.973 1119 1080 3 5 31

< DP/C-Type>
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
9
H(Pixels) +
174.50
83.894 2080 1920 48 32 80
1920 x 1080
V(Lines) - 74.973 1119 1080 3 5 31
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
4 720P 45.00 60 O
5 1080P 56.25 50 O
6 1080P 67.50 60 O
(Recommend Mode)
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Only training and service purposes

- 7 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
BLOCK DIAGRAM
RTD2556UT
(Realtek)
32M
SERIAL
Flash
LED PANEL
LVDS
PWM_
DIM
F/B
SPI
Data/
CLK
DP_TMDS
Aux
USB3.0
Down Stream
USBGL850G
-33
APA2068
(Anpec)
Audio
IN
Speaker
KEY0/1
WLED_
EN
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
Type-c

- 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
540
or
510
330
400
910
900
920
300 200
500
120

DISASSEMBLY
push button to depart body

Remove 4 screws with drover removeBackcoverwithjig removecable
remove 2screws remove control
Remove 9 screw separate ca from module
- 9 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes

- 10 - 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 X100
N
Check JK400
Voltage Level (19V)
Check Power connector
OK ? Replace Power Connector
Y
N Y
Check IC402 Output
Voltage Level (1.1V, 3.3V)
Replace IC402 &
Recheck
Y
N
Check X100 Clock
14.318MHz
Check IC401 Output
Voltage Level : C460 (5VS)
Replace IC401 &
Recheck
N
Y
Replace IC100 Flash Memory
Y
Replace Cable
N
Module Back Light On? Check IC400
Replace LED driver IC
Y
N N
Check Panel Power 5V(JP101)
Check IC400 Output 5V
Replace IC400 &
Recheck
Y
N
Check Panel Clock
P108(#10,11,22,23)
Check IC101
Replace Main B/D
Y
N
Check FFC Cable for Damage
or Open Conductors
Check LED Driver FB
(P400)
Replace T-Con Board or
Module
Y

- 11 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
No Video – DP
No Video – HDMI
Replace Main Scaler (IC101)
Check input signal format
Is it supported?
Check DP(JK201) pin for proper
connection or Damage Replace Connector
Y
N
Check I2C Signal Re Download EDID Data
Y
N
Y
Check DP Cable for Damage
or Open Connector
Y
Replace Main Scaler (IC101)
Check input signal format
Is it supported?
Check HDMI pin(JK200) for proper
connection or Damage Replace Connector
Y
N
Check I2C Signal Re Download EDID Data
Y
N
Y
Check HDMI Cable for
Damage or Open Connector
Y

- 12 - Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes
No Video – Type-C
Replace Main Scaler (IC101)
Check input signal format
Is it supported?
Check Type-C pin(JK502) for
proper connection or Damage Replace Connector
Y
N
Check I2C Signal Re Download EDID Data
Y
N
Y
Check Type-C Cable for
Damage or Open Connector
Y