LG 32UN880 User manual

CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
Copyright © 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means),
publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you
have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual.
The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service
Manual.
P/NO : MFL69413828(2006-REV00)
LM20K
LED MONITOR
32UN880 32UN880-BA
32BN88U 32BN88U-BA
32UN88A 32UN88A-WA

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

11 Power Rating Input : DC 19.5Vdc / 8.0 A Checked Request to regulation team
12 Accessory Box - - Not applied
P/No Specification
EAJ65651301 (ZBD)
EAJ65651302 (Non-ZBD)
EAJ65651401 (Korea Market)
31.5” UHD MODULE (BOE)
13 Applying module list Checked
MV315QUM-N20
SPECIFICATION
No Item Content Measurement Result Remark
1 Customer BRAND Checked BRAND : LGE Product
2 User Model Name 32UN880, 32BN88U, 32UN88A Checked
3 Sale region Worldwide Checked
4 Feature 31.5” LCD MONITOR (IPS UHD HDR10) Checked
5 Chassis Name LM20K Checked
Up / Down / Left / Right /
OK
External SW & Adj. Joystick switch Checked Press and Hold : Power off
General
6 Picture Mode, Aspect Ratio, S.E.S, Six Color, On Screen
Control, HDR10, Dual Controller, Factory Calibration
HW Calibration, Speaker 5W x2
Scope Function Checked
HDMI IN HDMI1 (1.4 / 2.0) / HDMI2 (1.4 / 2.0) Checked
7 Input DP IN Display Port(1.4 / 1.2 / 1.1) Checked Display Port(1.4) for HDR f unction
USB-C IN
Display Po
rt(1.4 / 1.2 / 1.1), *PD 60W, USB Data Checked
*PD ; Power delivery
USB DN USB 3.0 Downstream x 2 Checked Do not support Quick charging
H/P OUT Audio L/R Checked
RS-232C N/A Checked Do not support
Length 1.55±0.05m: 1.55m Refer to Suffix standard and
power cord Table.Power Cord Weight 0.174kg ± 10%, 0.173kg
Color Black Checked
Length 1.5 ± 0.05m 1.50m
Weight 0.062kg ± 10% 0.062kg
Color Black Checked
USB C To C Cable P/N : EAD63932607
8 Impedance
Cable Length 1.50m ± 0.05m 1.5m
Weight 0.090kg ± 10% 0.090kg
Color Black Checked
HDMI P/N : EAD65185204
Impedance
P/N : EAY65068604 (Refer to BOM)
ACC-LATP1, SHENZHEN HONOR EL
ECTRONIC CO.,LTD
Output: DC 19.5V 10.8A, 210W Adapter
Color: Black, Weight : 0.769kg ±10%
10 Power (Adapter / PSU /LPB) Checked
- 4 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
1) CABLE : 90 Ω±15Ω
2) CONNECTOR : 90
Ω±10Ω
1) 84.21~94.41ohm
2) 93~95.47
1) CABLE : 100Ω±5Ω
2) CONNECTOR : 100
Ω±10Ω
1) 96.69~105.73ohm
2) 90.73~108.97ohm

1) 32UN880, 32BN88U, 32UN88A
No Item Spec Measurement Result Remark
Supported Digital : Separate Sync Only
(cf. AV or RGB : Support SoG)
32UN880 Only Support Digital
1 Sync.Type Separate Sync. Checked
30 ∼70kHz(HDMI1.4)
30 ∼135kHz(HDMI2.0)
Horizontal Checked
HDMI
HDMI2.0 Native : 60Hz
Vertical 40 ∼60 Hz Checked
Horizontal 30kHz ∼135kHz Checked
Operating
2 Single
Frequency DP Native : 60Hz
Vertical 40 ∼60 Hz Checked
HDMI Horizontal 30 ~ 135kHz Checked
(Freesync)
EDID FreeSync Range
48 ~ 60 Hz (Basic)
40 ~ 60 Hz (Extended)
Vertical Checked
Horizontal 135 ~ 135kHz Checked FreeSync Range : 135K-135KHz
DP
(Freesync) EDID FreeSync Range
48 ~ 60 Hz (Basic)
40 ~ 60 Hz (Extended)
Vertical Checked
Horizontal 30 ∼135kHz Checked
USB –C Vertical 40 ∼60 Hz Checked Native : 60Hz
Max. 3840×2160 @ 60Hz HDMI ULTRA HD Deep Color :ON
When HDMI ULTRA HD Deep Color off, Max V
Frequency is 30Hz in 3840*2160
HDMI Checked
Recommen 3840×2160 @ 60Hz
Max. 3840×2160 @ 60Hz
3 Resolution Single DP Checked
Recommen 3840×2160 @ 60Hz
d
Max. 3840×2160 @ 60Hz
USB –C Checked
Recommen 3840×2160 @ 60Hz
d
4 Input Voltage 19.5V / 10.8A Checked
- 5 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
1) Basic mode : 48-60Hz
2) Extended mode : 40-60Hz
User Manual FreeSync Range :
1) Basic mode : 48-60Hz
2) Extended mode : 40-60Hz
1) Basic mode : 48-60Hz
2) Extended mode : 40-60Hz
User Manual FreeSync Range :
1) Basic mode : 48-60Hz
2) Extended mode : 40-60Hz

- 6 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
DisplayPort / 10-bit color Checked
5 Color depth USB-C
HDMI1 / HDMI2 Deep Color(10bit, 12bit) Checked
HDMI1 100 ohm (+-10%) 102~103ohm
Impedance HDMI2 100 ohm (+-10%) 102~103ohm
6 Pattern DP 100 ohm (-+10%) 99~105ohm
USB-C 90 ohm (-+10%) 90~91ohm
7 Inrush Current Cold Start : 50A Hot : 120A Checked
8 Operating Sync Video LED Wattage
Condition (H/V)
UHD@60Hz, Full white
OSD setting : Outgoing condition
(OSD Brightness 100)
White *The evidence of Max condition
On Mode (Max) On/On Full white (Off after 160W (Max) 154W -.Display : 50W
-.USB PD : 60W
-.USB HUB : 9W
-.Speaker : about 5W
15sec.)
UHD@60Hz, Full white
OSD setting : OSD Brightness 100
White
On Mode (Typ) On/On Full white (Off after 55W (Typ) 53W
15sec.)
White
EPA 8.0 On/On Test video (Off after 31.65W 27.1 W OSD setting : brightness 200cd.
Refer to EPA test condition.
15sec.)
PC : Stand-by Mode.
Input : HDMI,DP
OSD setting : Outgoing Condition
(OSD Brightness 70)
Off/On
Sleep Mode On/Off Off Off 0.5W 0.3W
Off/Off
Off/On PC : Stand-by Mode.
Sleep Mode Input : HDMI,DP,USB-C
On/Off Off Off 0.5W 0.3W
(For CEL regulation) Off/Off
Off Mode - - Off 0.3W 0.25W DC Switch Off
White OSD setting : Outgoing Condition
(OSD Brightness 70)
ERP On/On Test video (Off after 39.97W 36.1W Refer to Erp test condition
15sec.) *ErP A Class : 39.97 W
CEC outgoing Brightness setting :
OSD Brightness “45”
Spec. : Brightness : 200cd/m^2 ±35%
Power consumption test condition
OSD setting : brightness 200cd
White
CEC (On mode) On/On Test video (Off after 52.89W 30.23W
15sec.)
Off/On
CEC On/Off Off Off 1.2W 0.6W
(Sleep + Off Mode) Off/Off
Efficiency Test with outgoing condition (출하조건)
Test video
(OSD Brightness 70)
SMART ENERGY White Low: 19%
On/Off Test video (Off after low : 15 +/- 5%
SAVING High: 25%
15sec.) high : 25 +/- 5%
9MTBF 30,000 HRS with 90% confidence level 848,444 Lamp Life : 30,000 Hours(Min)
10,000 feet(3,048m) for Reliability
40,000 feet(12,192m) for Storage / Shipment
10 Using Altitude - -
Temperature : 0°C ~ 40°C Checked User Manual
Environment operating
s11 Humidity : Less than 80% Checked
Condition
Storage Temperature : -20°C ~ 60°C Checked

- 7- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Humidity : Less than 85% Checked
Brightness 0 – 100 Checked
Contrast 0 – 100 Checked
Quick Volume 0 – 100 Checked
Settings Custom / Warm / Medium / Cool /
Manual (W1~W8, C1~C10)
Checked
Color Temp
MaxxAudio On/Off Checked
Input List HDMI1/HDMI2/DisplayPort/USB-C Checked
Input Aspect Ratio Full Wide/Original/Just Scan Checked *FreeSync. On: Full Wide/Original
Custom/Vivid/HDR Effect/
Reader/Cinema/FPS/RTS/Color
Weakness / Calibration1/ Calibration2
/ sRGB / DCI-P3
OSD Picture Mode Checked
Menu
Brightness 0 – 100 Checked
Picture Contrast 0 – 100 Checked
Sharpness 0 – 100 Checked
Picture Super High / Middle / Low / Off Checked
Adjust Resolution+
Black Level High / Low Checked
DFC On / Off Checked
Game Response Time Faster / Fast/Normal / Off Checked
Adjust FreeSync Extended / Basic / Off Checked
*for HDR Signal,
There are 5 functions as below.
1) Custom
2) Vivid
3) Cinema
4) FPS
5) RTS
*Calibration2(Default : Disable)
:When the Customer calibrate this menu with
TRUE Color PRO, this menu will be enabled.
Black Stabilizer 0 – 100 Checked Step : 5
Gamma Mode1 / Mode2 / Mode3 / Mode4 Checked
Color Temp Custom/Warm/Medium/Cool/Manual Checked
Red 0 – 100 Checked
Green 0 – 100 Checked
Blue 0 – 100 Checked
Color
Adjust Red Hue / Saturation : 0 – 100
Green Hue / Saturation : 0 – 100
Blue Hue / Saturation : 0 – 100
Cyan Hue / Saturation : 0 – 100
Magenta Hue / Saturation : 0 – 100
Yellow Hue / Saturation : 0 – 100x
Six Color Checked
Picture Reset Yes / No Checked
Volume 0 – 100 Checked
Sound MaxxAudio On/Off Checked
English, German, French, Spanish,
Italian, Swedish, Finnish, Portuguese,
Portuguese(brazil), Polish, Russian,
Greek, Ukrainian, Chinese,
Traditional Chinese, Japanese,
Korean, Hindi
Language Checked
General
Smart Energy Saving High / Low/ Off Checked
Power LED On / Off Checked
Automatic Standby 8H / 6H / 4H / Off Checked
DisplayPort Version 1.4 / 1.2 / 1.1 Checked
HDMI ULTRA HD Deep Color On / Off Checked

Black Stabilizer 0 – 100 Checked Step : 5
Gamma Mode1 / Mode2 / Mode3 / Mode4 Checked
Color Temp Custom/Warm/Medium/Cool/Manual Checked
Red 0 – 100 Checked
Green 0 – 100 Checked
Blue 0 – 100 Checked
Color
Adjust Red Hue / Saturation : 0 – 100
Green Hue / Saturation : 0 – 100
Blue Hue / Saturation : 0 – 100
Cyan Hue / Saturation : 0 – 100
Magenta Hue / Saturation : 0 – 100
Yellow Hue / Saturation : 0 – 100x
Six Color Checked
Picture Reset Yes / No Checked
Volume 0 – 100 Checked
Sound MaxxAudio On/Off Checked
English, German, French, Spanish,
Italian, Swedish, Finnish, Portuguese,
Portuguese(brazil), Polish, Russian,
Greek, Ukrainian, Chinese,
Traditional Chinese, Japanese,
Korean, Hindi
Language Checked
General
Smart Energy Saving High / Low/ Off Checked
Power LED On / Off Checked
Automatic Standby 8H / 6H / 4H / Off Checked
DisplayPort Version 1.4 / 1.2 / 1.1 Checked
HDMI ULTRA HD Deep Color On / Off Checked
Buzzer On / Off Checked
OSD Lock On / Off Checked
OSD Size Small / Large Checked
Information OK Checked Total Power On time, Resolution
Reset to Initial Settings Yes / No Checked
- 8- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.

- 9- Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
3. Signal Timing (Resolution)
3.1. Signal (Video & Sync)
–Display Port & USB C
DOT Frequency Total Display Front Sync. Back
Mode section polarity CLOCK Resolution
[kHz]/[Hz] Period(E) (A) Porch(D) (C) Porch(B)
[MHz]
H(Pixels) - 31.469 800 640 16 96 48
1 25.175 640 x 480
V(Lines) - 59.94 525 480 10 2 33
H(Pixels) + 37.879 1056 800 40 128 88
2 40 800 x 600
V(Lines) + 60.317 628 600 1 4 23
H(Pixels) - 48.363 1344 1024 24 136 160
3 65 1024 x 768
V(Lines) - 60 806 768 3 6 29
H(Pixels) + 67.5 2200 1920 88 44 148
4 138.5 1920 x 1080
V(Lines) - 60 1125 1080 4 5 36
H(Pixels) + 88.79 2720 2560 48 32 80
5 241.50 2560 x 1440
V(Lines) - 59.95 1481 1440 3 5 33
H(Pixels) + 66.66 4000 3840 8 144 8
6 297.00 3840 x 2160
V(Lines) - 30 2222 2160 54 5 3
H(Pixels) + 133.32 4000 3840 8 144 8
7 533.25 3840 x 2160
V(Lines) - 60 2222 2160 54 5 3
7) Recommended Timing

- 10 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
- HDMI
HDMI Video input
Factory support
mode
Horizontal
frequency
Vertical
frequency
(Preset Mode) (KHz) (Hz)
1 480P 31.5 60
2 720P 45 60
3 1080P 67.5 60
4 2160P 135 60
Frequency Total Display Front Sync. Back
Mode section polarity DOT CLOCK[MHz] Resolution
[kHz]/[Hz] Period(E) (A) Porch(D) (C) Porch(B)
H(Pixels) - 31.469 800 640 16 96 48
1 25.175 640 x 480
V(Lines) - 59.94 525 480 10 2 33
H(Pixels) + 37.879 1056 800 40 128 88
2 40 800 x 600
V(Lines) + 60.317 628 600 1 4 23
H(Pixels) - 48.363 1344 1024 24 136 160
3 65 1024 x 768
V(Lines) - 60 806 768 3 6 29
H(Pixels) + 67.5 2200 1920 88 44 148
4 138.50 1920 x 1080
V(Lines) - 60 1125 1080 4 5 36
H(Pixels) + 88.79 2720 2560 48 32 80
5 241.50 2560 x 1440
V(Lines) - 59.95 1481 1440 3 5 33
H(Pixels) + 66.66 4000 3840 8 144 8
6 297.00 3840 x 2160
V(Lines) - 30 2222 2160 54 5 3
H(Pixels) + 135 4400 3840 176 88 296
7 594 3840 x 2160
V(Lines) - 60 2250 2160 8 10 72
6) Recommended Timing (HDMI1.4) , HDMI ULTRA Deep Color : OFF
7) Recommended Timing (HDMI2.0) , HDMI ULTRA Deep Color : ON

- 11 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
BLOCK DIAGRAM

900
500 510
300 200 400
540
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 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
330 120
930 920
520

- 13 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
TROUBLE SHOOTING GUIDE
Trouble shooting Guide : No Power
Replace IC601&
Recheck
N
Check C410 or C404
Voltage Level (19V)
Check Power connector
OK ? Replace Adapter
Y
N Y
Check IC403 Output
Voltage Level (3.3V)
Replace IC403 &
Recheck
Y
N
Check IC601 Output (pin#16)
Voltage Level (5V)
Replace IC400 &
Recheck
Y
Check IC400 Output
Voltage Level (1.1V)
Y
N
Check IC600 Output(pin#16)
Voltage Level (10V)
Y
Check IC404 Output
Voltage Level (1.1V)
Y
Check IC407 Output
Voltage Level (1.8V)
Replace IC600 &
Recheck
N
Replace IC404 &
Recheck
N
Replace IC407 &
Recheck
N

- 14 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Trouble shooting Guide : No Screen on
Check WLED_ENABLE High?
(IC600/IC601, 27pin)
Module Back Light On? N
YY
Check LED Driver Output
(P600/P602 - 1,2,3,4,5,6) Replace LED Driver IC
N
Check Panel Power 10V (IC600)
Check IC600 Output 10V
Replace IC600 &
Recheck
N
Y
Replace T-con Board or Module

- 15 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
Trouble shooting Guide : No video –HDMI
Check input signal format
is it support?
Y
Check HDMI Cable for
Damage or Open Connector
Y
Replace the Connector
Check JK100 , JK101 for
proper connection or Damage
Y
N
Check IC200 I2C Signal
(#1,2,155,156) Replace the IC200
N

- 16 - Copyright © LG Electronics Inc. All rights reserved.
Only training and service purposes.
8.c. Trouble shooting Guide: No video –DP
Replace the IC200
N
Check input signal format
is it support?
Y
Check DP Cable for Damage
or Open Connector
Y
Check IC200 AUX Signal
(#54,55)
Replace the Connector
Check JK102 for proper
connection or Damage
Y
N