LG FLATRON M1721A, FLATRON M1921A Service Manual

COLOR MONITOR

SERVICE MANUAL

Website:http://biz.LGservice.com

E-mail:http://www.LGEservice.com/techsup.html

CAUTION

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

CHASSIS NO. : CL-81

MODEL: M1721A (M1721A-BMF.A**NLF)

M1921A (M1921A-BMF.A**NLF)

*( ) **Same model for Service

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CONTENTS

SPECIFICATIONS

SPECIFICATIONS ................................................... 2

PRECAUTIONS ....................................................... 3

SERVICE PRECAUTIONS ...................................... 4

TIMING CHART ....................................................... 7

DISASSEMBLY ....................................................... 8

BLOCK DIAGRAM ................................................... 9

DESCRIPTION OF BLOCK DIAGRAM ................. 10

ADJUSTMENT ...................................................... 12

TROUBLESHOOTING GUIDE .............................. 16

WIRING DIAGRAM ............................................... 20

EXPLODED VIEW...................................................21

REPLACEMENT PARTS LIST ...............................23

SCHEMATIC DIAGRAM......................................... 29

1. LCD CHARACTERISTICS

Type : TFT Color LCD Module Active Video Area : 17.0 inch-M1721A

: 19.0 inch-M1921A

Size : 358.5(V) x 296.5(H) x 17(D)-M1721A

396.0(V) x 324.0(H) x 16.5(D)-M1921A

Pixel Pitch :

0.264mm x 0.264mm x RGB-M1721A

0.098mm x RGBmm x 0.294-M1921A Color Depth : 6Bits with FRC, 16,777,216 colors Surface Treatment : Anti Glare, Hard Coating(3H) Operating Mode : Normally white Backlight Unit : 4CCFL Electrical Interface : LVDS

2. OPTICAL CHARACTERISTICS

2-1. Viewing Angle by Contrast Ratio ≥ 10

M1721A

Left : -60° min., -70° typ Right : +60° min., +70° typ Top : +60° min., +75° typ Bottom : -50° min., -65° typ

M1921A

Left : -70° min., -80° typ Right : +70° min., +80° typ Top : +60° min., +70° typ Bottom : -50° min., -85° typ

2-2. Luminance : 160(min.), 250(typ.) 2-3 Contrast Ratio : 300(min.), 550(max.)-M1721A

: 350(min.), 650(max.)-M1921A

3. SIGNAL (Refer to the Timing Chart)

3-1. Analog Video Input

1) Video Input Range : 0~0.7V ± 5%

2) Video Termination Impedance : 75Ω ±5%

3) Sync Type : Separate Sync.

4) Sync Level : TTL Low ≤ 0.8V, High ≥ 2.0V

3-2. Operating Frequency

Horizontal : 30 ~ 70kHz Vertical : 56 ~ 75Hz

4. RESOLUTION

Analog Max : 1280 x 1024@60Hz

5. POWER SUPPLY

5-1. Power

AC 100-240Vac, 50/60Hz

5-2. Power Consumption

6. ENVIRONMENT

5-1. Operating Temperature : 10°C ~ 35°C 5-2. Operating Humidity : 20% ~ 80% 5-3. MTBF : 50,000 Hours (Min)

7. DIMENSIONS (with TILT/SWIVEL) M1721A

Width : 394.4 mm (15.53'') Depth : 243 mm (9.57'') Height : 404 mm (15.91'')

M1921A

Width : 445 mm (17.52'') Depth : 243 mm (9.57'') Height : 457 mm (17.99'')

8. WEIGHT (with TILT/SWIVEL) M1721A

Net. Weight : 4.5 kg (9.92 lbs) Gross Weight : 6.2 kg (14.33 lbs)

M1921A

Net. Weight : 5.5 kg (12.13 lbs) Gross Weight : 7.1 kg (15.66 lbs)

H/V SYNC

ON/ON

OFF/ON ON/OFF

OFF/OFF

MODE

POWER ON (NORMAL)

SLEEP MODE

POWER S/W OFF

VIDEO

ACTIVE

OFF

POWER CONSUMPTION less than 40 W-M1721A less than 45 W-M1921A

less than 1 W

LED COLOR

BLUE

RED

OFF

TIMING CHART

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VIDEO

SYNC

1 H(Pixels) + 25.175 31.469 800 640 16 96 48 640 x 350

V(Lines) - 70.09 449 350 37 2 60

2 H(Pixels) - 28.321 31.468 900 720 18 108 54 720 X 400

V(Lines) + 70.08 449 400 12 2 35

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

V(Lines) - 59.94 525 480 10 2 33

4 H(Pixels) - 31.5 37.5 840 640 16 64 120 640 x 480

V(Lines) - 75 500 480 1 3 16

5 H(Pixels) + 40.0 37.879 1056 800 40 128 88 800 x 600

V(Lines) + 60.317 628 600 1 4 23

6 H(Pixels) + 49.5 46.875 1056 800 16 80 160 800 x 600

V(Lines) + 75.0 625 600 1 3 21

7 H(Pixels) +/- 57.283 49.725 1152 832 32 64 224 832 x 624

V(Lines) +/- 74.55 667 624 1 3 39

8 H(Pixels) - 65.0 48.363 1344 1024 24 136 160 1024 x 768

V(Lines) - 60.0 806 768 3 6 29

9 H(Pixels) - 78.75 60.123 1312 1024 16 96 176 1024 x 768

V(Lines) - 75.029 800 768 1 3 28

10 H(Pixels) + 108.0 63.981 1688 1280 48 112 248 1280 x 1024

V(Lines) + 60.02 1066 1024 1 3 38

MODE

H / V

Sync

Polarity

Dot

Clock

Frequency

Total

Period

( E )

Video

Active

Time ( A )

Sync

Duration

( D )

Front

Porch

( C )

Blanking

Time

( B )

Resolution

DISASSEMBLY

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Hold the stand body & stand base.

1. Let the all latches are separated

2. Disassemble back cover.

Separate body & stand base.

Remove the screws.

# 1

# 4

# 2

# 3

Disassemble Connector.

# 5

BLOCK DIAGRAM

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U101

J124

J705

Option

33V

U301

30P Wafer

U201

J103

R/G/B Out

from UOC

TN200

Tuner

Pack

DESCRIPTION OF BLOCK DIAGRAM

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1. Power Supply Block (LIPS)

This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240V, 50/60Hz, 1.0A) Also it has the inverter function converts input voltage to AC Rms value for the LCD lamp.

2. DC/DC Converter Block

DC/DC Converter convert the input 5V, 15V to proper 3.3V, 5V, 8V, 12V for Main control system. For shooting heat trouble, we use the DC/DC converting IC

3. Audio Amplifier

This block is composed of TPA3005D2 and peripheral device. The function of the audio amplifier is that to amplify audio L / R signal transmitted from audio decoder. The audio signal is amplified according to pre-defined DC volume control curve.

4. Audio / Video / IF Decoder / Scaler

This block is composed of LOC1 and peripheral devices.

1) Video Decoder This Block Selects input Video signals (like CVBS, Y/C) and output RGB signal. On decoding, We can control signal like Contrast, Brightness, Sharpness, Color, Tint signals including Adaptive Comb Filter.

2) Audio Decoder This Block analyzes audio input signal through A/V Jack and PC audio and Tuner IF. The analyzed signals transmitted to audio amplifier. On decoding, We can control signal like Bass, Treble.

3) IF Decoder This block can change IF signal to audio and video signal that transmitted to Video/Audio decoder.

4) Scaler This IC includes A/D Converter and LVDS Transmitter. This IC is directly inputted Analog signal and transmits it to LCD Module.

5) Micom This block controls each IC through IIC communication line.

5. Switch IC (PI3V512QE)

It is composed of PI3V512Q. This IC selects between D-sub RGB signal and LOC1 RGB signal, and it transmits the selected signal to video signal processor.

6. Tuner (included Tuner Pack (TN200))

Micom controls this through IIC Line. Tuner makes IF and transmits IF signal to LOC1.

LIPS Board Block Diagram

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EMI

COMPONENTS

LINE

100 ~ 240V

INPUT RECTIFIER

AND FILTER

ENERGY

TRANSFER

OUTPUT RECTIFIER

AND FILTER

15V

GND

SIGNAL

COLLENT-

ION

PHOTO COUPLER ISOLATION

HVDC

100KHz

PRIMARY SECONDARY

50 ~ 60Hz

PWM COMTROL CIRCUIT

Operation description_LIPS

1. EMI components.

This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI, CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.

2. Input rectifier and filter.

This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.

3. Energy Transfer.

This part function is for transfer the primary energy to secondary through a power transformer.

4. Output rectifier and filter.

This part function is to make a pulse with modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achieve the DC output stabilized, and also the over power protection is also monitor by this part.

5. Photo-Coupler isolation.

This part function is to feed back the DC output changing status through a photo transistor to primary controller to achieve the stabilized DC output voltage.

6. Signal collection.

This part function is to collect the any change from the DC output and feed back to the primary through photo transistor.

EDID ADJUSTMENT

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Windows EDID V1.0 User Manual

Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup

Windows 2000, XP => Need to Port Setup.

This program is available to LCD Monitor only.

1. Port Setup a) Copy “UserPort.sys” file to

“c:\WINNT\system32\drivers” folder

b) Run Userport.exe

c) Remove all default number d) Add 300-3FF

e) Click Start button. f) Click Exit button.

2. EDID Read & Write

1) Run WinEDID.exe

2) Edit Week of Manufacture, Year of Manufacture, Serial Number a) Input User Info Data b) Click “Update” button c) Click “ Write” button

※※

If you don't write EDID, check below

1. Enter "SVC Menu" (refer 14page)

- Enter "Etc"

- Enter "Write Protect 1 : EDID protection (No write) 0 : EDID wirte

- Write EDID

2. Escape " SVC Menu" and push "In-stop" Button on SVC-Remote controller.

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220

IBM Compatible PC

PARALLEL PORT

Power inlet (required)

Power LED

ST Switch

Power Select Switch (110V/220V)

Control Line

Not used

RS232C

PARALLEL

V-SYNC

POWER

VGS

MONITOR

V-Sync On/Off Switch (Switch must be ON.)

10 5

4.7K

74LS06

OFF ON

OFF

RGB(PC/DTV) IN

ANTENNA IN

AUDIO (RGB) IN

H/PS-VIDEO

AV IN 2

AV1

(Mono)

VIDEO

AUDIO

Video Signal Generator

Figure 1. Cable Connection

ADC ADJUSTMENT

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1. DCXO setting in Video (AV2)

■ Convert to AV2 in Input-source

■ Signal equipment display

Output Voltage : 700 mVp-p Impress Resolution : NTSC J (Model No.207 at MSPG925L) Pattern : Color Bar (Pattern No.33 ant MSPG925L)

1) IN-START selection of Service Remote Controller

2) OPTION4 Selection

3) Right button selection in DCXO-AUTO(AV2). Then, DCXO-AUTO may change from 0 to 1.

4) DCXO value confirmation (Exit and Enter again Option4 _ Menu+Option4 selection)

2. Video (AV2) input ADC

■ Signal equipment display

Output Voltage : 700 mVp-p Impress Resolution : NTSC J (Model No.207 at MSPG925L) Pattern : Gray pattern that left & right is black and center is white signal. (Pattern No.29 ant MSPG925L)

1) IN-START selection of Service Remote Controller

2) AUTOADC Selection

3) Right button selection in Auto Gain. Then, Value of Offset and Gain may change.

Service Menu

Auto ADC

Reserved

Option 1 Option 2 Option 3

Reset All

XXXX. XX. XX NTSC - XX LOC Ver XX. XX. XX

Sedna Ver XX. XX. XX

24 NG

Option 4

DCXO NG BRIFE NG

HD NG AV NG

Option 4

DCXO 60

1 1

195

0 1

UART Mssg. ON

DCXO-AUTO(AV2)

EEPROM WP IIC-SW

2 Hours Off Opt.

(AUTHOR) Sedna-Lee K.W.

Lee J.U.

Jang H.B. Kim S.K.

UOC-Park K.W.

BL-ADJ

New Sawfilter

Service Menu

Auto ADC

Reserved

Option 1 Option 2 Option 3

Reset All

XXXX. XX. XX NTSC - XX LOC Ver XX. XX. XX

Sedna Ver XX. XX. XX

24 NG

Option 4

DCXO NG BRIFE NG

HD NG AV NG

Auto Gain

BRIFE

Green Gain

BRIFE - USA BRIFE - KOR

Blue Gain

Red Offset Green Offset Blue Offset

Red Gain

00 00

00 00 00

DCXO Adjustment Pattern (No.33)

Service Main Menu Option 4 Menu

(700mVp-p) ADC Adjustment Pattern (No.29)

Service Main Menu

Auto Gain

+ 22 hidden pages

LG FLATRON M1721A, FLATRON M1921A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual