LG 34UC98 Schematic

Internal Use Only

LED MONITOR

SERVICE MANUAL

CHASSIS : LM55E

MODEL : 34UC98 34UC98-WF

CAUTION

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

P/NO : MFL68920172 (1511-REV00)

CONTENTS

CONTENTS .............................................................................................. 2

SAFETY PRECAUTIONS

SPECIFICATION

....................................................................................... 4

........................................................................ 3

ADJUSTMENT INSTRUCTION

DISASSEMBLY

...................................................................................... 12

TROUBLE SHOOTING GUIDE

BLOCK DIAGRAM

EXPLODED VIEW

................................................................................. 19

.................................................................................. 20

............................................................... 6

.............................................................. 14

Only for training and service purposes

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To Instrument's exposed METALLIC PARTS

Good Earth Ground such as WATER PIPE, CONDUIT etc.

AC Volt-meter

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 Schematic Diagram and 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

Only for training and service purposes

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SPECIFICATION

NOTE : Specications and others are subject to change without notice for improvement.

1. General Specication

Item Content Remark

1 Customer BRAND

2 User Model Name 34UC98

3 Sale region World Wide

4 Feature 34 Inch Wide Curved LCD MONITOR(WQHD)

5 Chassis Name LM55E

6 General Scope External SW &Adj. 5-way joystick switch

Function PBP, Picture Mode Ratio, Gamma Calibration, SES, Six

Color, 7W speaker x 2, DisplayPort, HDMI x 2, Screen split, USB hub(USB3.0 x 2)

7 Power Code Length : 1.55 ± 0.05 M, Shape : Wall-out, Color : Black

Weight : 0.16kg

Input HDMI1/2 IN HDMI 1 and HDMI 2

DP IN Display Port

Thunderbolt Thunderbolt

USB UP USB upstream(only with Host PC)

USB 1/2 USB downstream(only with Host PC)

Quick Charge(USB 1 only)

H/P Audio L/R

8 Cable TBT

(Thunderbolt)

Displayport Length : 1.5 ± 0.05 M

HDMI Length : 1.5±0.05 M

9 Power Input: AC100 - 240V 50 - 60Hz, 1.5A Max

Length : ,Shape : ,Color: ,Pin N/A

Shape : Detachable Type Color : White Weight : 0.10kg±10%,

Shape : Detachable Type Color : White Weight : 0.09kg±10%,

Output: DC 19V 5.79A, 110W Adapter Color : White Weight : 0.438kg±10%, without vinyl bag

Refer to Sufx standard

and power cord table

EAD63127604

EAD00926140

EAY63032203

2. Engineering Specication

No. Item Specication Remarks

1 Supported Sync. Type Separate Sync., Digital

HDMI

2 Operating Frequency

3 Resolution

4 Input Voltage Input Voltage Voltage :100 - 240 Vac, 50 or 60 Hz, 1.5 A

Only for training and service purposes

DP/TBT

DP (FreeSync)

HDMI

DP/TBT

Horizontal 30 ~ 90kHz Vertical 56 ~ 61 Hz Native : 30 ~ 60 Hz Horizontal 30 ~ 90kHz Vertical 56 ~ 61 Hz Native : 30 ~ 60 Hz Horizontal 90 Hz Vertical 48 ~ 75 Hz Max 3440×1440 @ 60 Hz Recommend 3440×1440 @ 60 Hz Max 3440×1440 @ 60 Hz Recommend 3440×1440 @ 60 Hz

- 4 -

3. Signal Timing (Resolution)

3.1. Signal (Video & Sync)

3.2. H/V Timing

No. Section Pol. Dot Clock

[MHz]

1 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480 HDMI

V(Lines) - 59.94 525 480 10 2 33 DP/TBT

2 H(Pixels) + 40 37.879 1056 800 40 128 88 800 x 600 HDMI

V(Lines) + 60.317 628 600 1 4 23 DP/TBT

3 H(Pixels) - 65 48.363 1344 1024 24 136 160 1024 x 768 HDMI

V(Lines) - 60 806 768 3 6 29 DP/TBT

4 H(Pixels) + 79.99 54.347 1472 1152 32 96 192 1152 x 864 HDMI

V(Lines) + 60.05 905 864 1 3 37 DP/TBT

5 H(Pixels) + 74.25 45 1650 1280 110 40 220 1280x720 HDMI

V(Lines) + 60 750 720 5 5 20 DP/TBT

6 H(Pixels) + 108 63.981 1688 1280 48 112 248 1280x1024 HDMI

V(Lines) + 60.02 1066 1024 1 3 38 DP/TBT

7 H(Pixels) + 108 60 1800 1600 24 80 96 1600 x 900 HDMI

V(Lines) + 60 1000 900 1 3 96 DP/TBT

8 H(Pixels) - 146.25 65.29 2240 1680 104 176 280 1680x1050 HDMI

V(Lines) + 59.954 1089 1050 3 6 30 DP/TBT

9 H(Pixels) + 148.5 67.5 2200 1920 88 44 148 1920x1080 HDMI

V(Lines) - 60 1125 1080 4 5 36 DP/TBT

10 H(Pixels) - 185.58 66.7 2784 2560 64 64 96 2560x1080 HDMI

V(Lines) + 60 1111 1080 3 10 18 DP/TBT

11 H(Pixels) + 157.75 43.82 3600 3440 48 32 80 3440x1440 HDMI

V(Lines) + 29.99 1461 1440 3 10 8 DP/TBT

12 H(Pixels) + 265.25 73.68 3600 3440 48 32 80 3440x1440 HDMI

V(Lines) + 49.99 1474 1440 3 10 21 DP/TBT

13 H(Pixels) + 319.75 88.82 3600 3440 48 32 80 3440x1440 HDMI(1)

V(Lines) + 59.97 1481 1440 3 10 28 DP/TBT

Frequen-

[kHz]/[Hz]

Total

Cycle

(E)

Display

(A)

Front

Porch(B)

Sync.

(D)

Back

Porch(F)

Resolution Input

source

(2)

Only for training and service purposes

- 5 -

3.3. HDMI Video input

Factory support mode Horizontal frequency Horizontal frequency

No.

1 640x480P 31.47 60

2 720x480P 31.47 60

3 1280x720P 45 60

4 1920x1080P 67.5 60

5 1280x720P 37.5 50

6 1920x1080P 56.25 50

7 2560x1080P 56.25 60

8 2560x1080P 66 50

9 720x576P 31.25 50

(Preset Mode) (KHz) (Hz)

Only for training and service purposes

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ADJUSTMENT INSTRUCTION

1. Application Range

This document is applied to LM55E chassis Monitor which is manufactured in Monitor Factory or is produced on the basis of this data.

2. Designation

(1) The adjustment is according to the order which is desig-

nated and which must be followed, according to the plan

which can be changed only on agreeing. (2) Power Adjustment: Free Voltage (3) Magnetic Field Condition: Nil.

(4) Input signal Unit: Product Specication Standard

(5) Reserve after operation: Above 5 Minutes (Heat Run) Temperature : at 25 °C ± 5 °C Relative humidity : 65 % ± 10 % Input voltage : 100 V~ 240 V, 50/60Hz (6) Adjustment equipments: Color Analyzer (CA-210 or CA-

110), DDC Adjustment Jig equipment,

3. Main PCB check process

* APC - After Manual-Insult, executing APC

3.1. ADC Process

N/A

- EDID Ver. 1.3 FOR HDMI 1 (256Byte)

- EDID Ver. 1.3 FOR HDMI 1 (256Byte)_PBP Mode

3.2. EDID Process

3.2.1. EDID Download

F/W includes default EDID for All input ports, aging on Mode If AC ON, default EDID is automatically loaded to EEPROM. Update serial number in EDID of HDMI1.

→ Caution : Never connect HDMI Cable when execute

NVRAM Init and AC On at rst for downloading

HDMI EDID automatically.

No Item Content 16 Data

1 Manufacturer ID GSM 1E 6D

2 Product ID HDMI : 30454

Display Port (10bit / Free-sync) : 30436 Display Port (8bit) : 30266 TBT (10bit) : 23267 TBT (8bit) : 30437

3 Year 2015 19

4 Version 1 1

5 Revision HDMI : 3

DP : 4

6 Model Name DP : 4 -

** Protocol : DDC 2AB

E6 76 E4 76 E2 5A E3 5A E5 76

HDMI : 3 DP : 4

- EDID Ver. 1.3 FOR HDMI 2 (256Byte)

- EDID Ver. 1.3 FOR HDMI 2 (256Byte)_ PBP Mode

Only for training and service purposes

- 7 -

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