LG UltraFine 22MD4KB User manual

P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2016 - 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
MFL68920197 (1803-REV01)
LM6FA
22MD4KA(22MD4KB)
UltraFine 4K MONITOR

- 2 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SPECIFICATION ....................................................................................... 4
TROUBLE SHOOTING GUIDE ................................................................ 6
BLOCK DIAGRAM ................................................................................... 9
EXPLODED VIEW .................................................................................. 10
DISASSEMBLY ...................................................................................... 11
CHECK GUIDE ........................................................................ APPENDIX
TRAINING MANUAL ................................................................ APPENDIX
CONTENTS

- 3 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in
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.
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 MΩand 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
IMPORTANT SAFETY NOTICE
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
SAFETY PRECAUTIONS

- 4 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
SPECIFICATION
NOTE : Specications and others are subject to change without notice for improvement.
1. General Specication
No Item Content Remark
1 Customer BRAND
2 User Model Name 22MD4KA(22MD4KB)
3 Sale region World Wide
4 Feature 22” LCD MONITOR(4K)
5 Chassis Name LM6FB
6 General Scope External SW &Adj. 5-way joystick switch
Function USB-C Alt mode, Power Delivery, Speaker,
Ambient Light Sensor, HDCP2.2
7 Input USB-C3 USB-C3 input USB-C Type
USB 2.0 communication In TBT3 Jack
USB down USB2.0 Downstream x 3 (USB-C design)
Audio USB data format Audio (48kHz,24bit) UAC1.0
ALS Ambient Light Sensor Front
8 Power Code Length : 1.80, Shape : Wall-out, Color : White
Weight : 0.17kg
P/No : EAD63890501~EAD63890508
Refer to Sufx standard
and power cord table
9 Cable USB Type-C Length :1.8M, Shape : USB-C , Color: Black, Pin 24
P/No. : EAD63932601
Luxshare
10 Power Input: AC100~240V 50~60Hz, 2.5A Max
Output: DC 20V 7.5A, 150W PSU
Yuyang

- 5 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. Signal Timing (Resolution)
2.1. Signal (Video & Sync)
3.2. H/V Timing
No. Section Pol. Dot Clock
[MHz]
Frequen-
cy
[kHz]/[Hz]
Total
Cycle
(E)
Dis-
play
(A)
Front
Porch(B)
Sync.
(D)
Back
Porch(F)
Resolution
1 H(Pixels) + 472.45 113.13 4176 4096 8 32 40 4096x2304
V(Lines) - 48 2357 2304 1 8 44
2 H(Pixels) + 522.61 133.32 3920 3840 8 32 40 3840x2160
V(Lines) - 60 2222 2160 1 8 23
3 H(Pixels) + 234.59 88.86 2640 2560 8 32 40 2560x1440
V(Lines) - 60 1481 1440 1 8 23
4 H(Pixels) + 593.82 142.2 4176 4096 8 32 40 4096x2304 1)
V(Lines) - 60 2370 2304 1 8 57
5 H(Pixels) + 292.77 70.11 4176 4096 8 32 40 4096x2304
V(Lines) - 30 2337 2304 1 8 24
6 H(Pixels) + 257.66 65.73 3900 3840 8 32 40 3840x2160
V(Lines) - 30 2191 2160 1 8 22
7 H(Pixels) + 401.24 116.64 3440 3360 8 32 40 3360x1890
V(Lines) - 60 1944 1890 1 8 45
8 H(Pixels) + 133.32 66.66 2000 1920 8 32 40 1920x1080
V(Lines) - 60 1111 1080 1 8 22

- 6 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
1. No Video – USB-C Up
R e plac e X500
N
Ch eck C950
Voltage Level ( 2 0V)
Ch eck P ower connector
OK ? P ower b oard
Y
N Y
Ch eck IC903 Output
V o l ta g e Level ( 3 .3V)
R e plac e IC902 &
R e check
Y
N
Ch eck X500 Clock
14.318MHz
Ch eck IC904 Output
Voltage Level ( 1 .1V)
R e plac e IC903 &
R e check
N
Y
R e plac e IC501 Flash
M e mory
Y
Ch eck IC092 Output
Voltage Level (1.8V)
R e plac e IC904 &
R e check
N
Y

- 7 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
2. No Screen on
R e place Cable
N
Module Back Light On?
Check IC800
Replace LED Driver IC
Y
N
N
Ch eck Panel P ower 10V (L903)
Check IC900 Output 10V
R e plac e IC900 &
R e check
Y
N
Ch eck Panel e DP AUX
P501(#17,18)
Ch eck IC500
R e pair Main B/D
Y
N
Check FFC Cable for Damage or
Open Conductors
Check LED Driver Output
(P800 –3,4)
R e plac e T -Con Board or M odule
Y
R e plac e M ain Scaler IC(IC501)
N
Ch eck WLED_ENABLE High?
Y

- 8 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. No Video – USB-C Up
Replace Main Scaler (IC500)
Check input signal format
Is it s upported?
Check JK101 for proper
co nnection or Damage Replace Connector
Y
N
Y
Check DP Cable for Damage
or Open Connector
Y

- 9 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
BLOCK DIAGRAM
Scaler
RTD2797(5)
FW Update
L R
BLU LGD
4CH
500nit(typ)
Billboard
USB-PD
TPS65982(3)
TI
MUX
PS8742B
Parade
Flash
8Mb
USB-C Hub
GL3523S
Genesys
Down1
Down2
Down3
Down4
USB2.0 Hub
GL850G
Genesys
Upstream
Flash
8Mb
Upstream
Down1 Down2
Down3
Down4
Micom
LPC11U68
NXP
USB Audio
Processor
ALC4040
Realtek
Flash
8Mb
Audio
Amplifier
NTP7515D Neof idelity
USB2.0
LED Driver
LP8860-Q1
TI
Flash
8Mb TCON LGD
21.5" eDP
Hsync
DDC
USB2.0
DDCVGA
PWM
I2C
I2C
PWM
eDP
I2S
MUX Control
CC1,2(Vconn) AUX
VBUS(PD)
Type-C(4Lane)
USB2.0
USB3.0(2Lane) SS Tx/Rx
USB2.0
PWM
I2C
I2C
I2C
I2C_2
AMSEL / EN / POL
I2C_1
ALS
CM3232
Capella
I2C
DP input
DP(4Lane)
AMSEL
AMSEL H: DP 4Lane AMSEL L: DP 2Lane + USB3.0 2lane
EEPROM
32Kb
I2C
DDC3
DDC2
Cir No: JK203

Copyright © - 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 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
900
541
300 200
350
830
530
545
540
120
700
AM1
400
LV1

- 11 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
DISASSEMBLY
1) Open the set from the Box and Put on set on at place.
2) Detach the stand moving button.
3) Unscrew the 3EA screw from Back cover.
4) Insert plastic adjuster lever between Cabinet and Back
cover at the groove of lever position.
*Caution : Handle with care from scratch.
5) Push plastic adjuster lever softly than unlock the Cabinet
and Back cover latch.
6) Push plastic adjuster lever softly one by one
*Caution : Handle with care from scratch.
Screw
Groove of lever
inside of Cabinet.

- 12 - Copyright © - LG Electronics Inc. All rights reserved.
Only training and service purposes.
7) Open the right side by hand (Need to pull strongly when
open the back cover.
*Caution : Handle with care from scratch and latch broken Pull
back cover softly to disassemble the latch
1) Bottom disassemble → 2) Left/Right side disas-
semble → 3) Top disassemble → 4) Open back
cover right side by hand
8) Disassemble LED Harness, LVDS cable, ALS cable, power
cable and speaker cable.
9) Unscrew the 4EA screw to detach Rear shield Assy from
LCM.
10) Unscrew the 11EA screw to detach middle cabinet from
LCM.
11) Detach Cabinet from LCM using plastic jig.
*Caution : If pull or push the LCM without releasing latch on
the cabinet, case top of LCM can be deformation.
So, Latch of cabinet and LCM should be released
before detach each other.
Screw
Screw
②ALS ③L V DS
④Power
⑤Speaker ①LED
④
③
②
①
⑤⑥⑦⑧
Using plastic jig, dis assemble Cabinet and LCM
One by one like left sequence. ①~⑧
La tc h

CHECK GUIDE
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

1. Execute “WIN_Service_App.exe”
0.Connect PC and Monitor
USB-C to C Cable
Or
USB-A to C Cable
P/N : EAD63809902 (USB A to C Cable)
P/N : EAD63932601 (USB C to C Cable)
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

2. Connection to monitor
1. Click Initialize
If Initialize succeed, you can see above pop-up.
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

3. Check display (Aging mode)
If you follow below steps, you can set the Aging mode with color pattern.
Steps
1. Put number into text box of Set Aging mode. (0: Off, 1: White, 2: Red, …)
2. Click [Set Aging] button.
3. Click [Get Aging] button.
4. AC Off On the monitor
5. The pattern what you configured will be shown in monitor screen.
(1) (2) (3)
Once you complete to check the screen by using Aging mode, please click
[Factory Reset] to reset the monitor.
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

4. Check Audio
②Before Check speaker, change the playback device as below.
③Play MP3 player and check sound and speaker
①Path: Start Control Panel Sound Click
LG Monitor Audio
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

5. Check USB HUB
②Check the below 3 items
USB Audio
ALS (Ambient Light Sensor)
USB Hub Device
Unknown USB device is no problem
①Path: Computer PropertyDevice Manager
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

TRAINING MANUAL
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.

▶Update the FW by LG Screen Manager
• LG Screen Manager is an application that provides ScreenSplit and monitor software update features.
• You can download and install the latest version from the LGE website (www.lg.com). - [LG Screen Manager]
1. FW update method
1. Select the ‘Monitor Update’ menu 2. Select the FW image Zip file
3. Progress the update 4. Complete the Update. Press the Restart button
Copyright ⓒ2016 - 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.