LG 27UP850 User manual

P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
P/NO : MFL69413839 (2102-REV00)
LED MONITOR
SERVICE MANUAL
LM21B
27UP850
CONFIDENTIAL
27BP85U

CONTENTS .............................................................................................. 2
SPECIFICATION ....................................................................................... 3
SAFETY PRECAUTIONS ...........................................................................8
BLOCK DIAGRAM ................................................................................... 9
EXPLODED VIEW .................................................................................... 10
CONTENTS

SPECIFICATION
*
* Provided accessory: #8/#9 , it’s different marketing request.
No Item Content Measurement Result Remark
1 Customer BRAND Checked BRAND : LGE Product
2 User Model Name 27UP850/27BP85U Checked
3 Sale region Worldwide Checked
4 Feature 27” LCD MONITOR (IPS UHD HDR) Checked
5 Chassis Name LM21B Checked PCB, Product spec., Adjustment spec.
6 General
Scope
External SW & Adj. Joystick switch Up / Down / Left / Right / OK Checked Press and Hold : Power off
Function
Picture Mode, Aspect Ratio, S.E.S, Six Color, On Scre
en Control, HDR400, Dual Controller, Factory Calibratio
n,
Speaker 5W x2, Waves MaxxAudio®
Checked
7 Input
HDMI IN HDMI1 (1.4 / 2.0) / HDMI2 (1.4 / 2.0) Checked
DisplayPort IN DisplayPort(1.4 / 1.2) Checked
USB-C IN DisplayPort(1.4 / 1.2), *PD 96W, 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
8 Power Cord
Length 1.55±0.05m: 1.55mRefer to Suffix standard and
Power cord Table.
Weight 0.174kg ± 10%, 0.173kg
Color White Checked
9 Cable
Phone to RS-232
Length 0.2 ± 0.01m N/A
Do not provide
Weight 0.02kg ± 10%, N/A
Color Black N/A
USB C To C Cable
Length 1.5 ± 0.05m 1.50m
P/N : EAD63932603
(Refer to BOM)
Weight 0.062kg ± 10% 0.062kg
Color White Checked
Impedance 1) CABLE : 90 Ω±15Ω
2) CONNECTOR : 90 Ω±10Ω
1) 84.21~94.41ohm
2) 93~95.47
DisplayPort
Length 1.50m±0.05m 1.5m
P/N : EAD63749403
(Refer to BOM)
Weight 0.136kg ± 10% 0.135kg
Color White Checked
Impedance 1) CABLE : 100Ω±5Ω
2) CONNECTOR : 100Ω±10Ω
1) 98.37~101.9ohm
2) 92.33~102.7ohm
HDMI
Length 1.50m ± 0.05m 1.5m
P/N : EAD63954402
(Refer to BOM)
Weight 0.090kg ± 10% 0.090kg
Color White Checked
Impedance 1) CABLE : 100Ω±5Ω
2) CONNECTOR : 100Ω±10Ω
1) 96.69~105.73ohm
2) 90.73~108.97ohm

10 Power (Adapter / PSU /LPB) Output: DC 19.5V 10.8A, 210W Adapter
Color: White, Weight : 0.769kg ±10% Checked
P/N : EAY65068601
ACC-LATP1 100-240Vac 19.5Vdc 10.8
A 50/60Hz World wide(IT) INLET 3P
DC PIN PLUG -SHENZHEN HONO
R ELECTRONIC CO.,LTD
11 Power Rating Input : TBD Checked
Need to be checked by NT regulation
team
12 Accessory Box - - Not applied
13 Applying module list
P/No Specification
Checked
27” UHD MODULE (BOE)
- ZBD : TBD
- Non-ZBD : EAJ65700801
- Korea Market : TBD
EAJ65700801 MV270QUM-N50

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

HDMI
Mode section polarity DOT CLOCK[MHz] Frequency
[kHz]/[Hz]
Total
Period(E)
Display
(A)
Front
Porch(D)
Sync.
(C)
Back
Porch(B) Resolution Measurement Result Remark
1 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480 Checked PC : Display
Resolution
Information
V(Lines) - 59.94 525 480 10 2 33
2 H(Pixels) + 40 37.879 1056 800 40 128 88 800 x 600 Checked
V(Lines) + 60.317 628 600 1 4 23
3 H(Pixels) - 65 48.363 1344 1024 24 136 160 1024 x 768 Checked
V(Lines) - 60 806 768 3 6 29
4 H(Pixels) + 138.50 67.5 2200 1920 88 44 148 1920 x 1080 Checked
V(Lines) - 60 1125 1080 4 5 36
5 H(Pixels) + 241.50 88.79 2720 2560 48 32 80 2560 x 1440 Checked
V(Lines) - 59.95 1481 1440 3 5 33
6 H(Pixels) + 297.00 66.66 4000 3840 8 144 8 3840 x 2160 Checked
V(Lines) - 30 2222 2160 54 5 3
7 H(Pixels) + 594 135 4400 3840 176 88 296 3840 x 2160 Checked
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
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

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

BLOCK DIAGRAM
RTD2595LT
UHD Panel
(3840x2160)
DDR2
SRAM
EDID
EEPROM
Flash
Memory
(32Mbyte)
SPI
Joystick
(Control Key)
KEY1, KEY2
E-DP
LED Driver IC
MP3378E *2
WLED_ENABLE WLED_ADIM
Sub-Micom
(LPC11U68UBD48)
UART for HW Calibration
I2C for Scaler FW update
PD Controller
(MUX)
I2C for PD update
PMIC
I2C for PD IC Control
PD
DP USB 3.0 CC communication
TS3DV642
(Switch)
DP Signal
DP Signal
DPRX, AUXN, HDP
HP
AMP
TMDS, DDC, HPD Audio
AMP
(Maxx Audio)
OCP IC
(FPF2895C)
19V_ON
PD (20V)
USB HUB
(RTS5411)
Flash
Memory
(8Mbyte)
SPI
USB 2.0 DN for Billboard
USB 3.0 UP
USB 2.0 DN
OCP IC
USB 2.0 UP
5V / 0.9A
5V / 0.9A
USB 3.0 / 2.0
EN

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
300
200
500 510
330
900
910
400
920
120