LG W1742S User manual
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CONTENTS
SPECIFICATIONS ...................................................2
PRECAUTIONS .......................................................3
TIMING CHART .......................................................7
DISASSEMBLY ........................................................8
BLOCK DIAGRAM...................................................11
DISCRIPTION OF BLOCK DIAGRAM .................. 13
ADJUSTMENT ...................................................... 15
SERVICE OSD ........................................................16
TROUBLESHOOTING GUIDE .............................. 17
WIRING DIAGRAM ............................................... 23
EXPLODED VIEW...................................................24
REPLACEMENT PARTS LIST ...............................26
SCHEMATIC DIAGRAM......................................... 35
SPECIFICATIONS
1.LCDCHARACTERISTICS
Type : TFT Color LCD Module
Active Display Area : 17.0 inch
Pixel Pitch : 0.285 (H) x 0.285 (V)
Color Depth : 6bits, 16.2M colors
Size : 389.2 (H) x 254.5 (V) x 11.5(D)
Electrical Interface : FFC
Surface Treatment : Hard-coating(3H), Anti-Glare
Operating Mode : Normally White, Transmissive mode
Backlight Unit : 2-CCFL
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio > 10
Left : 80°min., 85°(Typ) Right : 80°min,85°(Typ)
Top :85° min., 85°(Typ) Bottom : 65°min,85°(Typ)
2-2.Luminance :220(min), 300(Typ) (Full White pattern, 0.7V) -6500K
:170(min) (Full White pattern, 0.7V) -9300K
2-3. Contrast Ratio : 500(min), 600(Tye)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
• Type : Separate Sync, SOG
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.71 V
a) Color 0, 0 :0 Vp-p
b) Color 7 .0 :0.467Vp-p
c) Color 15, 0 : 0.714Vp-p
3) Input Iwpedance: 75 Ω
3-3. Operating Frequency
Horizontal : 30 ~ 83kHz
Vertical : 56 ~ 75Hz
4. Max. Resolution
D-sub Analog : 1440X900@75Hz
5. POWER SUPPLY
5-1. Power : AC 90~264V, 47.5/63Hz , 3.5Ma
5-2. Power Consumption
6. ENVIRONMENT
6-1. Operating Temperature : 0°C~40°C(Ambient)
6-2. Relative Humidity : 20%~80% (Non-condensing)
6-3. MTBF : 70,000 HRS with 90% Confidence
Lamp Life : 50,000 Hours(Min)
7. DIMENSIONS (with Stand)
Width : 40.49 cm (15.94 inches)
Depth : 19.84 cm (7.81 inches)
Height : 34.98 cm (13.77 inchs)
8. WEIGHT (excl. packing)
Net. Weight : 3kg (6.61 Ibs)
MODE H/V
SYNC VIDEO POWER
CONSUMPTION
LED
COLOR
21W(typical)
POWER
ON
(NORMAL)
STAND-BY
ON/ON
OFF/ON
ACTIVE
OFF
less than 1 W
BLUE
AMBER
SUSPEND ON/OFF OFF less than 1 W AMBER
DPMS
OFF OFF/OFF OFF less than 1 W AMBER
POWER
S/W OFF - - less than 1 W OFF
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DISASSEMBLY-Set
#1
Put the monitor on a soft flat.
#2
Pull out the hinge cover as arrow direction.
#3
Remove the three screws.
#4
Put the front cover upward. Then let the all latches
are separated.
#5
Put the front face down, disassembly back cover.
#6
Pull the key board out of bezel.
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BLOCK DIAGRAM-POWER
Power
Inverter
EMI filter RectificationTransformer
5V/12V
output OVP
Feedback
control
circuit
Switching
circuit (PWM
control IC &
MOSFER)
OVP protect
circuit
Diode
rectifier
Starting
resistor
12V
Rush
prevention
ON/OFF
DIM
Push-pull
circuit
Transformer
conversion
LC resonance
VDDA
ON/OFF circuit
PWM IC
OZ9938GN
Feedback
circuit
OVP circuit 2 CCFL lamps
Sampling Lamp open
protection
DIM circuit
12V
5V
100~240V
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DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part.
This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the
digital video signal using a pixel clock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is from 25MHz to 135MHz.
This part consists of the Scaler, ADC converter, TMDS receiver and LVDS transmitter.
The Scaler gets the video signal converted analog to digital, interpolates input to 1440 X 900 resolution signal and
outputs 8-bit R, G, B signal to transmitter.
2. Power Part.
This part consists of the one 3.3V, and one 1.8V regulators to convert power which is provided 5V in Power board.
12V is provided for inverter, 5V is provided for LCD panel.
Also, 5V is converted 3.3V and 1.8V by regulator. Converted power is provided for IC in the main board.
The inverter converts from DC 12V to AC 700Vrms and operates back-light lamps of module.
3. MICOM Part.
This part is including video controller part. And this part consists of EEPROM IC which stores control data, Reset IC and
the Micom.
The Micom distinguishes polarity and frequencies of the H/V sync are supplied from signal cable.
The controlled data of each mode is stored in EEPROM.
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LIPS Board Block Diagram
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 width 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.
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ADJUSTMENT
Windows EDID V1.0 User Manual
Operating System: DOS, windows98, 2000, XP
1. Parallel port setting
Enter your bios，and do as followings.
a) Integrated peripheral
b) Super IO Device
c) Parallel port mode
you should set the” parallel port mode” to SPP for using the DOS EDID tool surely.
2. EDID Write
1、Connect the signal line of monitor with DDC recorder
2、Choose the DDC RECORD program, and it shows on the screen, the choose the correct source base on the
monitor.
3、Click “LoadFile” ,then key in the manufacturer name、model name、product code, then choose the c
orrect model name base on the monitor.(as Fig. 2)
4、Scan serial No. to DDC recorder by Bar Reader, then read again in the Verify SN
5、According to the message of DDC program, when the picture as fig 1 appears, it show DDC record has finished
Fig.1
Please check Manufacturer Name、Vendor Assigned Code、Monitor Name、Serial Number：*****[????????
******] (it must be the same as Bar Code)、Week of Manufacture：**、Year of Manufacture：****、
Checksum：** (It must be the same as the last byte of data table, as follows picture shows)Above o
f all must be right, then if it shows the green “PASS”, it means record succeeds ,the red “Fail” mean
s record fails; then check the power supply and signal line, and ensure they are connected well ,the
n do DDC record again from the third step.
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1) Turn off the power switch at the front side of the display.
2) Wait for about 5 seconds and press MENU, POWER switch with 1 second interval.
3) The SVC OSD menu contains additional menus that the User OSD menu as described below.
a) CLEAR ETI: To initialize using time.
b) Auto Color: W/B balance and automatically sets the gain and offset value.
c) AGING: Select Aging mode (on/off).
d) PANEL: used panel type
e) NVRAM INIT: EEPROM initialize. (24C04)
f) R/G/B-9300K: Allows you to set the R/G/B-9300K value manually.
g) R/G/B-6500K: Allows you to set the R/G/B-6500K value manually.
h) R/G/B-Offset: Allows you to set the R/G/B-Offset value manually. (Analog Only)
i) R/G/B-Gain: Allows you to set the R/G/B-Gain value manually. (Analog Only)
Figure 1. Cable Connection for Micom uploading
SERVICE MODE
Connect to
the monitor Connect to
the PC
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TROUBLESHOOTING GUIDE
No Power
(Power Indicator Off)
Please reinsert and
make sure the AC of
90-264v is normal
Measure C423 (+)
=1.8V
U404 PIN2=3.3V
Check the Adapter/Inverter
section
Check CN404 or replace
Q409, Q410, and U404
NO
NO
YES
YES
1. NO POWER
Check X401 oscillate
waveforms are normal
Replace X401
Replace U401
NO
YES
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2. NO RASTER (OSD IS NOT DISPLAY)-LIPS
LIPS
No Raster
(OSD Is NotDisplayed)
Check U404
PIN 2 =3.3V?
Check U404
PIN 3 =5V?
Check power board and find out a
short point as penning each power
line
1. Check U404
2. Check C426,C427
Check C423 (+)
1.8V?
1. Check Q409,Q410
2. CheckC432,C423
3. TROUBLE IN SCALER IC
Check CN701
PIN1 =5V?
Check BL ON/OFF pulse as
contacting scope
NO
NO
NO
NO
YES
YES
YES
YES
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2. NO RASTER (OSD IS NOT DISPLAY)-MSTAR
1. Check C411 C412
2. Check X401
3. TROUBLE IN SCALER IC
SCALER PIN1，2
OSCILLATES AS
14.318MHZ?
No Raster
(OSD Is Not
Displayed)
CHECK CONNECTION
LINE FROM D-SUB TO
SCALER
TROUBLE IN CABLE OR
LCD MODULE
NO
YES
YES
NO
SCALER IC
PIN16 H SYNC ?
PIN17 V SYNC?
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