LG 172W Schematic
Service Guide Specification
Service Guide Specification
Model Description
1.
MODEL
SUFFIX
2.
L172WAL
ALUST
BRAND
Product Name
Printing Specification
1. Trim Size (Format) : 215mm x 280 mm
2. Printing Colors
• Cover : LG COLORS
• Inside : Black
3. Stock (Paper)
• Cover : Snow White 150 g/
• Inside : Snow White 100 g/
4. Printing Method :
5. Bindery : Saddle stitch
6. Language : English
7. Number of pages : 45 ( Including blank 3page)
LG
FLATRON L172WT
Part No.
3828TSL093E
Special Instructions3.
(1) Origin Notification
* LGEDI : Printed in Indonesia * LGEWA : Printed in U.K.
* LGESP : Printed in Brazil * LGEMX : Printed in Mexico
* LGENT : Printed in China * LGEIL : Printed in India
4.
Changes
8
7
6
5
4
3
2
1
REV.
MM/DD/YY
NO.
CHANGE NO.
CHANGE CONTENTS
Pagination sheet
Pagination sheet
Cover
Front cover
Inside
Contents
2
English
3
English
4
English
5
English
….
Blank Blank
English
…..
English39English
Rear cover
Inside
(blank)
40
Rear
Cover
COLOR MONIT OR
SER VICE 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-56
MODEL: L172WT (L172W AL-AL**T)
( ) **Same model for Service
1. LCD CHARACTERISTICS
Type : TFT Color LCD Module
Size : 17.1inch
Pixel Pitch : 0.291mm x 0.291mm
Color Depth : 8-bit, 16,777,216 colors
Electrical Interface : LVDS
Size :
258.0(V) x 400(H) x 22.0(D)
Surface Treatment :
Anti-Glare, Hard Coating(3H)
Operating Mode : Normally Black, Transmissive
Backlight Unit : 6-CCFL (Cold Cathode
Fluorescent Lamp)
2. SPECIAL FUNCTION
2-1. Auio AMP
1)Output : 3Wrms + 3Wrms
Rated Output : 2.7W(Min)
: 13.1Vpp(4.65Vrms)
2)Freq. Character : 100Hz~10KHz Range(-3dB)
3)Input : PC - 0.7
0.1Vrms
AV - 0.4
0.1Vrms
2-2. SPEAKER
1) Impedance : 8
2) Input : Max-5W, Normal-3W
2-3. TV
1) Type : NTSC
2) Tuner IF : PIF - 45.75MHz
SIF - 41.25MHz
CIF - 42.17MHz
3)
Receiving Channel
: VHF- Low: 55.25~127.25MHz
HIGH: 133.25~361.25MHz
UHF - 367.25~801.25MHz
2-4. AV
1) Video Level : Input - 0.7
0.15Vp-p
2) Sync Level : Input - 0.286
0.075Vp-p
3) Color Burst : Input - 0.214
0.072Vp-p
4) Audio Level : AV Input - 0.4
0.1Vrms
PC Input - 0.7
0.1Vrms
5) Video Cross Talk : 43dB
3. SIGNAL
3-1. Operating Frequency
Horizontal : 30 ~ 66kHz(Digital: 30~63kHz)
Vertical : 56 ~ 85Hz
3-2. Sync : Separate, Composite
SOG, Digital
4. OPTICAL CHARACTERISTICS
4-1. Viewing Angle by Contrast Ratio
≥
10
Left : -85° min., -88°(Typ)
Right : +85° min., +88°(Typ)
Top : +85° min., +88°(Typ)
Bottom : -85° min., -88°(Typ)
4-2. Luminance : 320(min), 370(Typ)
-9300K
300cd/m2(min)
-6500K
4-3. Contrast Ratio : 300(min), 400(Typ)
5. RESOLUTION
SXGA : 1280 x 1024 @ 60Hz
WXGA : 1280 x 768 @ 60Hz
6. POWER SUPPLY
6-1. Power Adaptor
Input : AC 100-240V~, 50/60Hz , 1.1A
6-2. Power Consumption
7. ENVIRONMENT
7-1. Operating Temperature: 10°C~35°C (50°F~95°F)
7-2. Operating Humidity : 10%~80%
7-3. MTBF : 50,000 Hours(Typ.)
8. DIMENSIONS (with TILT/SWIVEL)
Width : 505.5 mm (19.90'')
Height : 365 mm (14.37'')
Depth : 231.5 mm (9.11'')
9. WEIGHT (with TILT/SWIVEL)
Net. Weight : 6.6kg (14.55 lbs)
Gross Weight : 10.0kg (22.05 lbs)
CONTENTS
SPECIFICATIONS
- 2 -
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 4
TIMING CHART ....................................................... 5
OPERATING INSTRUCTIONS ................................ 6
DISASSEMBLY ..................................................... 10
BLOCK DIAGRAM ................................................. 11
DESCRIPTION OF BLOCK DIAGRAM...................12
ADJUSTMENT ...................................................... 13
TROUBLESHOOTING GUIDE .............................. 16
WIRING DIAGRAM ............................................... 23
EXPLODED VIEW...................................................24
REPLACEMENT PARTS LIST ...............................26
PIN CONFIGURATION............................................33
SCHEMATIC DIAGRAM......................................... 35
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
POWER OFF
H/V SYNC
ON/ON
OFF/ON
ON/OFF
OFF/OFF
POWER CONSUMPTION
less than 70 W
less than 5 W
less than 5 W
less than 5 W
LED COLOR
GREEN
AMBER
AMBER
AMBER
VIDEO
ACTIVE
OFF
OFF
OFF
- 3 -
Signal Connector Pin Assignment
Pin Signal (DVI-D)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
T. M. D. S. Data2T. M. D. S. Data2+
T. M. D. S. Data2/4 Shield
T. M. D. S. Data4T. M. D. S. Data4+
DDC Clock
DDC Data
Analog Vertical Sync.
T. M. D. S. Data1T. M. D. S. Data1+
T. M. D. S. Data1/3 Shield
T. M. D. S. Data3T. M. D. S. Data3+
+5V Power
Ground
(return for +5V,
H. Sync. and V. Sync.)
Pin Signal (DVI-D)
1
8
9
17
24
16
16
17
18
19
20
21
22
23
24
Hot Plug Detect
T. M. D. S. Data0T. M. D. S. Data0+
T. M. D. S. Data0/5 Shield
T. M. D. S. Data5T. M. D. S. Data5+
T. M. D. S. Clock Shield
T. M. D. S. Clock+
T. M. D. S. Clock-
T. M. D. S. (Transition Minimized Differential Signaling)
• DVI-D Connector (Digital)
- 4 -
WARNING FOR THE SAFETY-RELATED COMPONENT.
• There are some special components used in LCD
monitor that are important for safety. These parts are
marked on the schematic diagram and the
replacement parts list. It is essential that these critical
parts should be replaced with the manufacturer’s
specified parts to prevent electric shock, fire or other
hazard.
• Do not modify original design without obtaining written
permission from manufacturer or you will void the
original parts and labor guarantee.
TAKE CARE DURING HANDLING THE LCD MODULE
WITH BACKLIGHT UNIT.
• Must mount the module using mounting holes arranged
in four corners.
• Do not press on the panel, edge of the frame strongly
or electric shock as this will result in damage to the
screen.
• Do not scratch or press on the panel with any sharp
objects, such as pencil or pen as this may result in
damage to the panel.
• Protect the module from the ESD as it may damage the
electronic circuit (C-MOS).
• Make certain that treatment person’s body are
grounded through wrist band.
• Do not leave the module in high temperature and in
areas of high humidity for a long time.
• The module not be exposed to the direct sunlight.
• Avoid contact with water as it may a short circuit within
the module.
• If the surface of panel become dirty, please wipe it off
with a softmaterial. (Cleaning with a dirty or rough cloth
may damage the panel.)
WARNING
BE CAREFUL ELECTRIC SHOCK !
• If you want to replace with the new backlight (CCFL) or
inverter circuit, must disconnect the AC adapter
because high voltage appears at inverter circuit about
650Vrms.
• Handle with care wires or connectors of the inverter
circuit. If the wires are pressed cause short and may
burn or take fire.
PRECAUTION
CAUTION
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.
TIMING CHART
- 5 -
VIDEO
SYNC
B
D
C
F
E
A
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
H + 31.469 800 640 16 96 48
V – 70.8 449 350 37 2 60
H – 43.269 832 640 56 56 80
V – 85.0 509 480 1 3 25
H – 31.469 800 640 16 96 48
V – 59.94 525 480 10 2 33
H – 37.5 840 640 16 64 120
V – 75 500 480 1 3 16
H – 31.468 900 720 18 108 54
V + 70.8 449 400 12 2 35
H + 37.879 1056 800 40 128 88
V + 60.317 628 600 1 4 23
H + 46.875 1056 800 16 80 160
V + 75.0 625 600 1 3 21
H + 53.674 1048 800 32 64 152
V + 85.061 631 600 1 3 27
H+/– 49.725 1152 832 32 64 224
V+/– 74.55 667 624 1 3 39
H – 48.363 1344 1024 24 136 160
V – 60.0 806 768 3 6 29
H – 60.123 1312 1024 16 96 176
V – 75.029 800 768 1 3 28
H + 63.981 1688 1280 48 112 248
V + 60.02 1066 1024 1 3 38
H + 47.7 1680 1280 66 134 200
V + 60 795 768 1 3 23
Mode
H/V
Sort
1
2
3
4
5
6
7
8
9
10
11
12
13
25.175
28.321
25.175
31.5
36.0
40.0
49.5
56.25
57.283
65.0
78.75
108.0
80.14
640x350
70Hz
640x480
85Hz
640x480
60Hz
640x480
75Hz
720x400
70Hz
800x600
60Hz
800x600
75Hz
800x600
85Hz
832x624
75Hz
1024x768
60Hz
1024x768
75Hz
1280x1024
60Hz
1280x768
60Hz
Sync
Polarity
Frequency
Dot
Clock
Total Period
(E)
Video Active Time
(A)
Sync Duration
(D)
Back Porch
(F)
Front Porch
(C)
Resolution
- 6 -
FRONT VIEW
REAR VIEW CONNECTOR PANEL
REAR VIEW
OPERATING INSTRUCTIONS
S-Video
MIC.In
Front Control Panel(P6)
DVI-I
Audio
RL
PbYPr
S-Video
Audio In
MIC.Out
MIC.In
Theft prevention
locking device
Back
Cap
AV(CVBS) Input
Terminal(Audio)
AV(CVBS) Input
Terminal(Video)
S-Video Input Terminal
Headphone/Earphone
Connection Terminal
Microphone Connection
Terminal
1
3
4
5
2
1.
DVI Digital Signal Connector (DVI-D or DVI-A)
2. TV Tuner Jack: Connect the antenna.
3. Connect the power cord.
4. Connent to the jack in the PC sound card
5. HDTV Input Terminal
DVI-I
DVI-I
Audio In
MIC.Out
MIC.Out
RL
RL
PbYPr
PbYPr
S-Video
S-Video
Audio
Audio
Audio In
MIC.In
MIC.In
- 7 -
OPERATING INSTRUCTIONS
Front Control Panel
721643 5
• This Indicator lights up green when the display operates normally. If the display is in DPM
(Energy Saving) mode, this indicator color changes to amber.
• Press the button to turn on the power. Press the button again to turn it off.
Power LED
Power Button
• Adjust the volume.
• Use this button to directly control brightness and
contrast of the PC signal (DVI-D/DVI-A).
• Use this button to control the channel for the TV signal.
• Use this button to show/hide the OSD (On Screen Display) menu screen.
MENU Button
• Use the button to select an icon or adjust the setting in the OSD screen.
OSD Select/Adjust Button
[For DVI-ANALOG signal]
•Select the icon to adjust on the OSD screen.
•If you press the [AUTO/SELECT] button, automatic screen adjustment will be started.
[Other signals that DVI-ANALOG]
•The current signal and mode information will be displayed.
AUTO/SELECT Button
OSD Lock/Unlock Button
1
2
3
4
5
6
7
• Select the input signal
SOURCE
Button
• The unit that receives the signal from the remote controller.
DVI
AUTO/SELECT
SOURCE
DVI DIGITAL DVI digital signal
DVI ANALOG DVI analog signal
VIDEO1(CVBS) Composite video
VIDEO2(S-Video) S-Video
HDTV(Y, Pb, Pr) HD television
TV Television
•
OSD is locked
•
OSD is unlocked.
Use this button to lock/unlock OSD screen adjustment.
(Activated when pressed together longer than 5 seconds.)
Menu button +
Under the CAPTION & VCHIP menu, it is also
possible to lock/unlock the OSD screen
adjustment with the 'KEY LOCK' tab.
Remote Controller Buttons
- 8 -
Power On/Off Button
Channel Up/Down Button
•
Input Select Button
•
TV/AV Button
(See next page)
Sleep Button
When watching AV/HDTV/TV
-
The monitor will be automatically turned
off after a certain period of time.
Press this button repetitively to select an
appropriate time duration
PSM Button
When watching AV/HDTV/TV
- Automatically adjusts the image.
Press this button repetitively to set
the intended screen.
CAPTION Button
•
Menu Button
•
Exit Button
Auto Channel Button
TV: Automatic TV channel setup
PC: Automatic adjustment function
(Operational for the analog signal only)
Channel Number Select
Button
Operational at the TV mode only
Check Button
Sound Mode Select
Select the sound mode
: MONO/STEREO/SAP
Video Operation Button
Applicable for LG products only
Volume Button
Mute button
- 9 -
1. PIP (Picture in Picture) Button
The sub-screen moves to the next mode whenever you press this button.
: Small -> Large -> Off
2. POP (Picture out Picture) Button
The sub-screen moves to the next mode whenever you press this button.
: POP ON -> PBP(FULL) -> PBP(4:3) -> OFF
If you press the button once,
the following Input Signal
Window will appear. Select
the signal type you want
using the button.
This button will be enabled only
when you selected the TV/AV
signal. The signal type will be
changed with the following order.
Set the signal type you want.
POP ON PBP (FULL) PBP (4:3)
•
Input Select Button
•
TV/AV Button
TV VIDEO1 VIDEO2 HDTV
DVI
SWAP
SWAP
3. Swap Button
You can swap the main screen and the sub-screen when the PIP/POP/PBP
function is used..
When 'Input Signal 1' comes on in the main screen, only
'Input Signal 2' can be displayed on the sub-screen. On the
contrary, if the main screen displays 'Input Signal 2', the subscreen can display 'Input Signal 1' only. You can swap 'Input
Signal 1' and 'Input Signal 2' using the SWAP button.
<Table of PIP/POP/PBP Function Support>
DISASSEMBLY
- 10 -
1.BACK CAP REMOVAL
1)Remove the Back cap.
2. TV TUNER REMOVAL
1)Remove the screw(a).
2)Remove the Tuner.
CAUTION
To prevent scratches on the back cover, make sure to
detach the tuner before detaching the back cover.
(a)
- 11 -
BLOCK DIAGRAM
DDR
128Mb
SDRAM
3.3V
(HY5DU283222Q4)
4Mb Flash
(29LV040B)
Memory
LCD
Module
Even
R,G,B
12V Inverter
12V
1.8V
2.5V
3.3V
5V
DC/DC
5V 12V
Converter
Tuner
33V
Lips
2.5V
3.3V
2.5V
Format Converter Circuit
1.8V
EEPROM
Data
(FSD 0 ..31)
DDC-D
PCB_PWR
INV_PWR
LCM_PWR
AMP_PWR
Data
(OCMD 0 ..7)
(FSA 0 ..11)
(OCMA 0 ..19)
PCB_PWR
INV_PWR
LCM_PWR
AMP_PWR
Control Signals
8V
12V
ADC_IN1/
ADC_IN2
Key Control
(gm1501)
Processor
Video Signal
TXD
RXD
H/ V Sync
Video Signal
Digital Signal
System
EEPROM
SP (L)
(M37136)
SP (R)
Caption/V-Chip
Amp
3.3V
2.5V
FB/R1/G1/B1
HS/VS/VOUT
Audio
12V
TPA6110
(TPA3004)
VAROUTR/L
DVI-I
In
MiC
5V
3.3V
Video
Decoder
Y/C
CVBS-in
(VPC3230)
Tuner CVBS
Audio
Decoder
5V
8V
DTV Audio
(MSP3420G)
PC Audio
CVBS Audio
Analog Signal
Switch
Analog
(BA7657F)
Out
AV
Board
H/ V Sync
RGB
YPbPr
HDTV
MiC
- 12 -
DESCRIPTION OF BLOCK DIAGRAM
1. Input Signal Part
It is composed of four parts.
-PC signal input part:24pin DVI-I and PC Audio input
jack.
-AV Video input part: RCA Jack (CVBS signal), S-Video
Jack
-HDTV input part : YPbPr Jack and RL Stereo Audio
input jack
-TV signal input part: TV Tuner input Connector (TV
signal)
2. Video Signal Processor
It is composed of GM1501(U402)
GM1501 includes A/D Converter and LVDS Transmitter
GM1501 is directly Inputted Analog and Digital Signal
or Video Signal from Video Decoder
This Signal is converted into compatible Signal by
MICOM's control and then GM1501 transmit it to LCD
Module.
3. Analog Switch
It is composed of BA7657F
BA7657F Switch DVI-A to HDTV
4. Micom Controller
It is composed of 29LV040B(U403) its functions is
controlling each IC, display mode and frequency
through EEPROM and IIC communication.
5. Video decoder.
This block is composed of VPC3230D (U203) and
peripheral devices.
This IC analyzes input signal of CVBS, Y/C and output
analyzed signal (8bit interlace signal) to Video Signal
Processor block.
Analyzed signal has video control signals like Contrast,
Brightness, Sharpness, Color, tint signals Including
Adaptive Comb Filter.
6. Audio decoder part.
This block is composed of MSP3420G (U503) and
peripheral devices.
This IC analyzes Audio input signal through A/V Jack
and PC audio.
And output the analyzed signals to Audio Amplifier
(TPA3004).
7. Audio Amplifier
This block is composed of TPA3004 (U505) and
peripheral devices.
It amplifies audio signal input from Audio Decoder and
output amplified audio signal to Speaker, Audio Output
Jack.
8. Control
It receives outer key input, transmits the input to
Micom(U403).
There is key input part and remote controller receiver.
9. LIPS Part
It is composed of two parts
- Power Part functions that Input power converts to
33V,12V,5V power for operating circuits.
- Inverter Part functions that Input Power converts to
compatible "Vrms" value for operate LCD lamp.
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