LG W1943SB User manual
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E-mail: http://www.LGEservice.com/techsup.html
COLOR MONITOR
SERVICE MANUAL
MODEL:W1943SB (W1943SB-PFT.A**NAPH for
LGD TLC1, W1943SB-PFT.A**VAPH for AUO V00)**Sales Market
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*ToapplytheNovatekChip.
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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 MODE ......................................................... 17
TROUBLESHOOTING GUIDE .............................. 18
WIRING DIAGRAM ................................................... 24
EXPLODED VIEW...................................................... 25
REPLACEMENT PARTS LIST ................................. 27
DIFFERENT PARTS LIST….......................................... 34
SCHEMATIC DIAGRAM......................................... 35
SPECIFICATIONS
1.LCDCHARACTERISTICS
Type: matrix-TFT Color LCD Module
Active Display Area: 18.51 inches
Pixel Pitch: 0.3 (H) x 0.3 (V)mm
Color Depth: 16.7M colors
Size: 430.4(H) x 254.6(V) x 13.0(D) mm(Typ.)
Interface: LVDS 1Port
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 : 70°min, 85°(Typ) Right : 70°min, 85°(Typ)
Top :60° min, 75°(Typ) Bottom : 70°min,85°(Typ)
2-2.Luminance :250Cd / m2(min), 300Cd / m2(Typ)
-6500K; 170Cd / m2(min) -9300K
2-3. Contrast Ratio : 600(min), 1000(Typ)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
Type: Separate Sync, SOG (Sync On Green)
3-2. Video Input Signal
1) Type: R, G, B Analog
2) Voltage Level: 0~0.7 Vp-p
3) Input impedance: 75
3-3. Operating Frequency
Horizontal: 30 ~ 83kHz
Vertical: 56 ~ 75Hz
4. Max. Resolution
D-sub Analog: VESA 1360 x 768 @ 60 Hz
5. POWER SUPPLY
5-1. Power: AC 100-240V~ 50/60Hz 0.8A
5-2. Power Consumption
On Mode: 21 W(Typ.)
Sleep Mode: 1 W
Off Mode: 1 W
6. ENVIRONMENT
6-1. Operating
Temperature: 10°C~35°C
Humidity: 10 % to 80 % non-Condensing
6-2. Storage
Temperature: -20°C to 60 °C
Humidity: 5 % to 90 % non-Condensing
6-3. MTBF: 70000 Hours (Not include panel)
Lamp Life: 50000 Khrs
7. DIMENSIONS (with Stand)
Width: 44.90 cm (17.68 inches)
Depth: 18.30 cm (7.20 inches)
Height: 29.05 cm (11.44 inches)
8. WEIGHT (excl. packing)
Weight: 3.3 kg (7.28 lbs)
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TIMING CHART
mode section polarity
DOT
CLOCK
[MHz]
Frequency
[kHz]/[Hz]
Total
Period(E)
Display
(A)
Front
Porch
(D)
Sync.
(C)
Back
Porch
(B)
Resol-
ution
H(Pixels) - 31.468 900 720 18 108 54
1
V(Lines) +
28.321
70.08 449 400 12 2 35
720 X
400
H(Pixels) - 31.469 800 640 16 96 48
2
V(Lines) -
25.175
59.94 525 480 10 2 33
640 x
480
H(Pixels) - 37.5 840 640 16 64 120
3
V(Lines) -
31.5
75 500 480 1 3 16
640 x
480
H(Pixels) + 37.879 1056 800 40 128 88
4
V(Lines) +
40.0
60.317 628 600 1 4 23
800 x
600
H(Pixels) + 46.875 1056 800 16 80 160
5
V(Lines) +
49.5
75.0 625 600 1 3 21
800 x
600
H(Pixels) +/- 49.725 1152 832 32 64 224
6
V(Lines) +/-
57.283
74.55 667 624 1 3 39
832 x
624
H(Pixels) - 48.363 1344 1024 24 136 160
7
V(Lines) -
65.0
60.0 806 768 3 6 29
1024 x
768
H(Pixels) - 60.123 1312 1024 16 96 176
8
V(Lines) -
78.75
75.029 800 768 1 3 28
1024 x
768
H(Pixels) + 47.712 1792 1360 64 122 256
9
V(Lines) +
85.5
60.015 795 768 3 6 18
1360
x768
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BLOCK DIAGRAM-POWER
Power
Inverter
EMI filter RectificationTransformer
5V/14.5V
output OVP
Feedback
control
circuit
Switching
circuit (PWM
control IC &
MOSFER)
OVP protect
circuit
Diode
rectifier
Starting
resistor
14.5V
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
14.5V
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 85.5MHz.
This part consists of the Scalar, ADC converter, TMDS receiver and LVDS transmitter.
The Scalar gets the video signal converted analog to digital, interpolates input to 1360 X 768 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.
14.5V 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 14.5V 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 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 scalar.
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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
correct 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
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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：****、Check
sum：** (It must be the same as the last byte of data table, as follows picture shows). Above of all must
be right, then if it shows the green “PASS”, it means record succeeds ,the red “Fail” means record fails;
then check the power supply and signal line, and ensure they are connected well ,then do DDC record
again from the third step.
Fig.2
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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) CLEAA 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: NO
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 PC Connect to
the monitor
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TROUBLESHOOTING GUIDE
No Power
(Power Indicator Off)
Please reinsert and
make sure the AC of
100-240v is normal
Measure C707 (+)
=1.8V
U701 PIN2=3.3V
Check the Adapter/Inverter
section
Check CN404 or replace
C707, and U701
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
YES
1. Check C704
2. Check C706, C705
3. TROUBLE IN SCALER IC
No Raster
(OSD Is Not Displayed)
Check U701
PIN 2 =3.3V?
Check CN404
PIN 6, PIN7 =5V?
Check power board and find out a
short point as penning each power
line
1. Check U701
2. Check C702
Check C707 (+)
1.8V?
NO
NO
NO
YES
YES
YES
Check CN404
PIN 6, PIN7 =5V?
NO Check BL ON/OFF pulse as
contacting scope
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3. NO RASTER (OSD IS NOT DISPLAY)-MSTAR
1. Check C411 C412
2. Check X401
3. TROUBLE IN SCALER IC
SCALER PIN 63,
64 OSCILLATES
AS 12MHZ?
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
PIN 14 H SYNC ?
PIN 15 V SYNC?
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