LG 27GR93U LED Monitor User Manual

: June 12, 2024
: LG

Table of Contents

SAFETY PRECAUTIONS
SPECIFICATION
Signal Timing (Resolution)
BLOCK DIAGRAM
EXPLODED VIEW
ASSEMBLE AND DISASSEMBLE
TROUBLE SHOOTING GUIDE
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Download This Manual (PDF format)

LED MONITOR
SERVICE MANUAL
CHASSIS : LM33A
MODEL : 27GR93U

CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : MFL71821322(2305-REV00)

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.

SAFETY PRECAUTIONS

IMPORTANT SAFETY NOTICE
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 MΩ and 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

When 25A is impressed between Earth and 2nd Ground for 1 second, Resistance must be less than 0.1
*Base on Adjustment standard

SPECIFICATION

1. General Specification

: Item to write directly.
: Item you select from the list. (If the selected item is not on the list, ask the person in charge to add it and update the template)
– When adding a derivative model, change the name of the sheet after copying and adding the sheet. ex) 1. General Spec (derivative model name)

No	Category	Item	Data	*Remark
1	General	*Customer	Brand
*User Model Name	27GR93U
*Sales region	Worldwide
*Chassis Name	LM33A
*Main PCB P/N	EAX70070301
No	Category	Item	Data	*Remark
---	---	---	---	---
2	Display	*Module List	EAJ65857901	ME270QUM-NF4 / BOE






*Supply Type	Module
*Active Area diagonal Size(inch)	27
*Active Area Hor. Size(mm)	596.736
*Active Area Ver. Size(mm)	335.664
*Native Resolution	3840×2160
		*Refresh Rate(Max)	144Hz
---	---	---	---	---
*Refresh Rate(Recommeded)	144Hz

*Variable Refresh Rate

Range

Dimming

|
Aspect Ratio| 16:9|
Brightness (Typ.)(cd/m²)| 400|
Color Gamut(Typ.)| DCI-P3 95%|
Color Depth (Panel)| 1.07B|
Color Bit (Panel)| 10bit| 8bit + 2bit FRC
Contast Ratio(Typ.)| 1200:1|
Contast Ratio(Min.)| 960:1|
Response Time(Off)| 5ms| Panel Spec
Response Time(ms)| 1 / 3 / 4| Faster / Fast / Normal
Uniformity| 75%|
Curved| NO|
Multi EDID| NO|
PBP| NO|
PIP| NO|
*HDR| Display HDR

400

|
Flicker Free| YES|
LBL| NO|
*VESA ClearMR| NO|
No| Category| Item| *Support*| Range| Tier / Spec| Remark
---|---|---|---|---|---|---
Min| Max
3| Gaming Option| AMD Free Sync™| YES| 48| 144| Free Sync Premium|
NVIDIA G-Sync®| YES| 48| 144| G-SYNC® Compatible|
VESA Adaptive Sync| NO| | | |
Motion Blur Reduction| NO| | | |
Lighting| YES| | | Hexagonal|
No| Category| Interface| Support| Standard Version| Position| Port quantity| Charging Spec (Max)**| Remark
---|---|---|---|---|---|---|---|---
6| USB Support (Peripheral)| USB-A (Downstream)| YES| USB3.2 Gen1| Rear| 2| 5V/0.9A| 5Gbps
NO| | | | |
USB-B (Upstream)| YES| USB3.2 Gen1| Rear| 1| | 5Gbps
NO| | | | |
USB-C (Downstream)| NO| | | | |
NO| | | | |
USB-C (Upstream) w/o MFDP| NO| | | | |
NO| | | | |

No| Category| Item| *Support*| Position| Specification| Remark**
7| Audio| Head Phone| YES| Bottom| Digital AMP| w/ MIC|
DTS Headphone: X| YES| | |
Speaker| NO| | |
Rich Bass| NO| | |
MAXX AUDIO| NO| | |
Optical Digital Audio(Out)| NO| | |
| | Line Out| NO| | |
---|---|---|---|---|---|---
Audio In| NO| | |

8

|

Local Key

| Joystic| YES| Bottom| | Up / Down / Left / Right / OK
Tact| NO| | |
Wheel| NO| | |
LED Indicator| YES| Bottom| Red|
9| KVM| USB-B & USB-C| NO| | |
10| Auto Pivot| Auto Pivot| NO| | |
No| Category| Item| *Support*| Applied Type| Remark
---|---|---|---|---|---
11| Sensor Option| ALS| NO| |
FAN| YES| Internal|
TEMP| NO| |
IR| NO| |
Webcam| NO| |
Gyro| NO| |
No| Category| Item| Provide| Color| Length| Weight| P/N| Remark
---|---|---|---|---|---|---|---|---
12| Accessory| AccessoryBox| NO| | | | |
Adapter| YES| Black| | | EAY65689602| 19Vdc 3.42A 50~60Hz KR/EU WALL
| |
| |
| |
| |
PSU| NO| | | | |
|
|
Power Cord| YES| Black| 1.55M| | EAD62348835|
Power Extention| NO| | | | |
DP| YES| Black| 1.8M| | EAD65185308| Label : 5K
| | HDMI| YES| Black| 1.8M| | EAD65912803| HDMI 2.1 cable
---|---|---|---|---|---|---|---|---
USB-C to C| NO| | | | |
USB-A to B(2.0)| NO| | | | |
USB-A to B(3.0)| YES| Black| 1.8M| | EAD65573101|
Thunderbolt| NO| | | | |
DVI| NO| | | | |
D-Sub| NO| | | | |
Remote Control Reciever| NO| | | | |
Remote Controller| NO| | | | |
Webcam Assembly| NO| | | | |
Color Calibrator| NO| | | | |
USB-C to A Gender| NO| | | | |
No| Category| Type| Support| Data| Remark
---|---|---|---|---|---
13| Input Voltage| | | AC 100-240Vac~ 50/60Hz|
14| Power Rating| Adapter| YES| 19V 3.3A|
PSU| NO|
No| Category| Item| Data**| *Remark
---|---|---|---|---
15| Reliability| MTBF| 30,000 HRS with 90% confidence level|
Using Altitude| 10,000 feet(3,048m) for Reliability 40,000 feet(12,192m) for Storage / Shipment|
Environment Condition| Operating| Temperature : 0°C ~ 40°C Humidity : Less than 80%|
Storage| Temperature : -20°C ~ 60°C Humidity : Less than 85%|

Signal Timing (Resolution)

1, HDMI

No.| Resolution| Horizontal Freqency (kHz)| Vertical Frequency(Hz)| polarity(H/V)| Remark
---|---|---|---|---|---
1| 640 x 480| 31.469| 59.940| -/-|
2| 800 x 600| 37.879| 60.317| +/+|
3| 1024 x 768| 48.363| 60.004| +/+|
4| 1280 x 720 | 45.000| 60.000| +/+|
5| 1280 x 1024| 79.976| 75.025| +/+|
6| 1920 x 1080| 67.500| 60.000| +/+|
7| 1920 x 1080| 66.587| 59.934| +/-|
8| 3840 x 2160| 65.688| 29.981| +/-| Re commen Timing ded – Input Compatibility Veesion : 1.4
9| 1920 x 1080| 166.668| 144.052| +/-|
---|---|---|---|---|---
10| 2560 x 1440| 182.996| 119.998| +/-|
11| 3840 x 2160| 133.313| 59.997| +/-| Recommend Timing – Input Compatibility Version : 2.1 (AV)
12| 2560 x 1440| 222.268| 144.050| +/-|
13| 3840 x 2160| 333.333| 144.050| +/-| Recommend Timing – Input Compatibility Version : 2.1 (PC)

2, DP

NO.| Resolution| Horizontal| Vertical Fr eouencv (Hz)| polarity (H/V)| Remark
---|---|---|---|---|---
1| 640 x 480| 31.469| 59.940| -/-|
2| 800 x 600| 37.879| 60.317| +/+|
3| 1024 x 768| 48.363| 60.004| –I–|
4| 1280 x 720| 45.000| 60.000| +1+|
5| 1280 x 1024| 79.976| 75.025| +/+|
6| 1920 x 1080| 67.500| 60.000| +/+|
7| 1920 x 1080| 166.587| 143.981| +/-|
8| 3840 x 2160| 133.313| 59.997| +/-| Recommended Timing
– Input Compatibility Version : 1.2
9| 2560 x 1440| 222.151| 143.973| +/-|
10| 3840 x 2160| 214.680| 95.033| +/-|
11| 3840 x 2160| 268.438| 119.999| +/-| Recommended Timing
– Input Compatibility Version : 1.4
12| 3840 x 2160| 333.333| 144.050| +/-| Recommended Timing
– input Compatibility Version : 1.4(DSC)

HDMI Video input

No.| Factory Support mode (Preset Mode)| Horizontal Horizontal
Fregency (kHz)| Vertical Freauency (Hz)
---|---|---|---
1| 480P| 31.5| 60
2| 720P| 45| 60
3| 1080P| 67.5| 60
4| 1080P| 135| 120
5| 2160P| 135| 60
6| 2160P| 255| 120

BLOCK DIAGRAM

EXPLODED VIEW

ASSEMBLE AND DISASSEMBLE

Purpose: The document is intended for use by end-of life recyclers or treatment facilities.
It provides the basic instructions for the disassembly of products to remove components and materials requiring selective treatment.

1. Tools Required
List the type and size of the tools that would typically be used to disassemble the product to a point where components and materials requiring selective treatment can be removed.

Tool Description	Tool Size (if applicable)
Screw driver

2. Product disassembly Process
2.1 List the basic steps that should typically be followed to remove components and materials requiring selective treatment :

2.2 OPTIONAL : Depending upon the complexity of the disassembly process, a graphic depicting the locations of items contained within the product which require selective treatment (with descriptions and arrows identifying locations) can be inserted below:

2.3 How to describe the basic steps to disassembly a components.

Provide a picture of disassembly process
All the screws are showed in the picture
All the PCBAs are showed in the picture
LCD panel are showed in the picture
All the accessories like remote controller, batteries, and cables are showed in the picture

Caution: SVC man must check insulation sheet on the module before assembling the set