LG LM505J-L1510M Full

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.
MODEL: L1510M (LM505J-GL)
*( ) ID LABEL MODEL No.
CONTENTS
SPECIFICATIONS
- 2 -
1. LCD CHARACTERISTICS
Type : TFT XGA LCD Module Size : 352.0(H) x 263.5(V) x 14.0(T) Pixel Pitch : 0.297mm x 0.297mm Color Depth : 8Bits/ 16M colors Active Video Area : 15.0 inch
(304.128 x 228.096) Surface Treatment : Anti-Glare Backlight Unit : Top/Bottom edge side 2CCFL Electrical Interface : LVDS/TTL interface
2. OPTICAL CHARACTERISTICS
2-1. Viewing Angle by Contrast Ratio
10 Left : 60° min. Right : 60° min. Top : 45° min. Bottom : 45° min.
2-2. Luminance : 200(min.), 250(typ.) at Center point 2-3. Contrast Ratio :250(min.), 350(typ.)
3. SIGNAL (Refer to the Timing Chart)
3-1. Sync Signal
1) Type : Separate Sync. (Horizontal & Vertical)
2) Input Voltage Level: Low=0~0.8V, High=2.1~5.5V
3) Sync Polarity : Positive or Negative
3-2. Video Input Signal
1) Type : R, G, B Analog
2) Voltage Level : 0~0.714 V a) Color 0, 0 : 0 Vp-p b) Color 7, 0 : 0.467 Vp-p c) Color 15, 0 : 0.714 Vp-p
3) Input Impedance : 75
3-3. Operating Frequency
Horizontal : 31 ~ 63kHz(Automatic) Vertical : 56 ~ 75Hz(Automatic)
4. POWER SUPPLY
4-1. Power
100~240V, 50/60Hz 0.6A
4-2. Power Consumption
5. ENVIRONMENT
5-1. Operating Temperature: 10°C~35°C (50°F~95°F)
(Ambient)
5-2. Relative Humidity : 10%~80%
(Non-condensing)
5-3. MTBF : 50,000 Hours (min.)
Lamp Life : 30,000 Hours (min.)
6. DIMENSIONS (with TILT/SWIVEL)
Width : 360.0mm (14.17'') Depth : 153.0mm (6.02'') Height : 359.8mm (14.16'')
7. WEIGHT (with TILT/SWIVEL)
Net. Weight : 4.15kg (9.15 lbs) Gross Weight : 5.5kg (12.13 lbs)
8. Audio
RMS Audio Output : 1W + 1W(R+L) Input Sensitivity : 0.7Vrms Speaker Impedance : 4
SPECIFICATIONS ................................................... 2
PRECAUTIONS ....................................................... 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
WIRING DIAGRAM ................................................. 7
BLOCK DIAGRAM ................................................... 8
DESCRIPTION OF BLOCK DIAGRAM.................... 9
ADJUSTMENT ...................................................... 10
TROUBLESHOOTING GUIDE .............................. 11
PRINTED CIRCUIT BOARD................................... 15
EXPLODED VIEW...................................................17
REPLACEMENT PARTS LIST ...............................19
PIN CONFIGURATION............................................23
SCHEMATIC DIAGRAM ........................................ 28
MODE
POWER ON (NORMAL)
STAND-BY
SUSPEND
DPMS OFF
H/V SYNC
ON/ON OFF/ON ON/OFF
OFF/OFF
POWER CONSUMPTION
less than 30 W
less than 3 W less than 3 W
less than 3 W
LED COLOR
GREEN AMBER AMBER AMBER
VIDEO
ACTIVE
OFF OFF OFF
- 3 -
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
- 4 -
VIDEO
SYNC
B
D
C
F
E
A
H / V
H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines) H (Pixels) V (Lines)
Sync
Polarity
+
– –
+
– – – – – – – –
+ + + + + + + +
– – – – – –
+ +
Dot
Clock
25.175
28.322
25.175
30.24
31.5
31.5
36.0
40.0
50.0
49.5
57.2832
65
75
78.75
Frequency
31.468 KHz
70.0 Hz
31.468 KHz
70.0 Hz
31.469 KHz
60.0 Hz
35.0 KHz
66.67 Hz
37.861 KHz
72.8 Hz
37.50 KHz 75 Hz
35.156KHz
56.25 Hz
37.879 KHz
60.3 Hz
48.077 KHz
72.188 Hz
46.875 KHz
75.0 Hz
49.725 KHz
74.55 Hz
48.363 KHz
60.0 Hz
56.476 KHz
70.0 Hz
60.023 KHz
75.0 Hz
Resolution
640 x 350
720 x 400
640 x 480
640 x 480
640 x 480
640 x 480
800 x 600
800 x 600
800 x 600
800 x 600
832 x 624
1024 x 768
1024 x 768
1024 x 768
Total
Period
( E )
800 449 900 449 800 525 864 525 832 520 840 500
1024
625
1056
628
1040
666
1056
625
1152
667
1344
806
1328
806
1312
800
Video
Active
Time ( A )
640 350 720 400 640 480 640 480 640 480 640 480 800 600 800 600 800 600 800 600 832 624
1024
768
1024
768
1024
768
Blanking
Time
( B )
160
99
180
49
160
45
224
45
192
40
200
20
224
25
256
28
240
66
256
25
320
43
320
38
304
38
288
32
Sync
Duration
( D )
96
2
108
2
96
2
64
3
40
3
64
3
72
2
128
4
120
6
80
3
64
3
136
6
136
6
96
3
Back
Porch
( F )
48 60 55 34 48 33 96 39
128
28
120
16
128
22 88 23 64 23
160
21
224
39
160
29
144
29
176
28
Front
Porch
( C )
16 37 17 13 16 10 64
3
24
9
16
1
24
1
40
1 56 37 16
1 32
1 24
3 24
3 16
1
MODE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
(MAC)
(TEXT)
- 5 -
FRONT VIEW
REAR VIEW
Front Control Panel
1. Power Button
Use this button to turn the display on or off.
<Power (DPMS) Indicator>
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.
2. Menu Button
Use this button to enter or exit the On Screen Display.
3. Button
Use these buttons to choose or adjust items in the On Screen Display.
Volume:
Use these buttons to decrease or increase the volume level
.
4. AUTO/
SELECT Button
Use this button to enter a selection in the On Screen Display.
Power Connector
See front control panel
D-Sub Signal Connector
5 6 2 3 4 1
37
When adjusting your display settings, always press the AUTO/SELECT button before
entering the On Screen Display(OSD). This will automatically adjust your display image to the ideal settings for the current screen resolution size (display mode). The best display mode is
1024x768.
PROCESSING
AUTO CONFIGURATION
OPERATING INSTRUCTIONS
HEAD PHONE
AUDIO IN
5. LIGHT VIEW
This function optimizes the brightness, contrast or color value to the surrounding conditions and settings and enables you to enjoy the most suitable picture by adjusting the surroundings (DAY/NIGHT /USER MODE)
6. MUTE
Used to select mute on (means sound off) and mute off (means sound on).
CONTROLS LOCKED/UNLOCKED
:
MENU and Button for 3 seconds
Use this button to enter or exit the On Screen Display.
OPERATING INSTRUCTIONS
- 6 -
Front Control Panel
TEXT: For viewing letters
MOVIE: For viewing movies
PHOTO: For viewing pictures or
the photographs
USER MODE: This function memorizes the manual adjustment -Brightness, Contrast and Color value on the On Screen Display.
LIGHT VIEW
DAY
NIGHT
USER MODE
TEXT
MOVIE
PHOTO TEXT MOVIE PHOTO
37
This function allows you to secure the current control settings, so that they cannot be inadvertently changed. Press and hold the MENU button and button for 3 seconds: the message
“CONTROLS LOCKED”
appears.
You can unlock the OSD controls at any time by pushing the MENU button and button for 3 seconds: the message “CONTROLS UNLOCKED” will appear.
CONTROLS LOCKED
CONTROLS UNLOCKED
WIRING DIAGRAM
- 7 -
CN1
CN2
CN3
P902
J707
J705
J702
J701
J901
J706
J904
Connector Assy P/N:
6631T11012R
Connector Assy P/N:
6631T20008X
Connector Assy P/N:
6631T20020E
Connector Assy P/N:
6631T20015E
- 8 -
BLOCK DIAGRAM
EEPROM
24 LC08
ADC/PLL/Scaler
(GMZAN-2)
MICOM
(MTV312)
Sc hmit t Trigger
( 7 4HCT 14 A)
Panel
Interface
20 Pin
Connector
RGB
H.V
D-
Sub
15P
Control
S
C
LK
SDATA
CON
8P
Inverter
5VR
PL
MODPWR-
3.3V_PL3.3VD
5VR
3.3
3.3
3.3
3.3
3.3V
2.5
V_AD
Regulat or
Regulator
Regulat or
Regulat or
KA7805
BA033
BA033
VVV
D
ST
Hsync2
Vsync2
Hsyncm
Vsyncm
2.5VD
RC1171
VD
5VS
12V
CON 5P
<MAINBLOC
K>
_
_
AD
DSCL
DSDA
LVDS
Filter
BD
SMPS
Control
IC
TOP246
12V
5VS
CON 5P
<POWER BLOCK>
Headphone
Audio In
Audio
Processor
(TDA7449)
Audio Amp
(TDA7496L)
SCLSDA
78M08
8VA
12VA
CON 5P
12V
GND
SCL
SDA
Audio
Mute
Audio Mute
<AUDIO BLOCK>
U501
12V
U201
U502
U402
U701
U803
U802
U806
U805
U901
U902
EEPROM
24LC02
U702
DESCRIPTION OF BLOCK DIAGRAM
- 9 -
1. Scaler One chip IC(GMZAN-2, U201)
GMZAN-2 (U201) is one chip IC which it supports four internal function blocks of Video Amp, PLL, A/D converter and Video processor. Video signal (0.7Vp.p) clamped through C209, 208, 207 with matching ICs proper cut off voltage. This signal is processed as a proper 8 bit digital signal by U201s amplifying, phase locking, A/D converting, and scaling operations. U201 generates Clock, Horizontal and Vertical sync, Data Enable signals as LCD Panels input signals.
2. System Controller (Microprocessor) Circuit
1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input from signal source.
2) Microprocessor (U501) carries out power control by sending power-down trigger signal to each IC.
3) Microprocessor (U501) communicates with EEPROM (U502), and GMZAN-2 (U201) through IIC(2 lines) or 6 bit bus line. It makes all devices operated properly.
4) Microprocessor (U501) let User adjust screen by OSD function.
3. LVDS(Low Voltage Differential Signal, U402)
LVDS transmitter (U402) delivers digital signal to the receiver inside LCD module by method of abstraction. The abstracted signals are pairs of RIN0+-, RIN1+-, RIN2+-, RIN3+-, and RCLKIN+- of which voltage swing is 0.5V each. When SHUTON pins input is High, transmitter goes to power down mode.
4. DC/DC block
This block is composed of regulators which supplies 2.5V, 3.3V, and 5V. Each regulators source power is 5VS and 12V from power block. U806 supplies 2.5VD, U802 supplies 3.3VD, 3.3V_AD, and 3.3V_PL powers to GMZAN-2’s internal PLL, ADC, Pre-amp, and scaler by dropping down 5VS from power block. U805 supplies MODPWR-3.3V for LCD modules operation by dropping down 5VS from power block. U803 supplies 5VR for Microprocessor and Logic IC(U701)s operation by dropping down 12V from power block.
5. Power Block
This block supplies DC voltages of 5VS and 12V by converting AC input voltage of 100~240Vac. Converting method is SMPS(Switching Mode Power Supply).
6. Audio Part(TDA7449, TDA7496L)
In the circuit, audio processor(TDA7449) which is controlled by microprocessor(U501) adjust
volume/treble/bass/balance of audio signal which come from PC. The signal come from TDA7449 is amplified by TDA7496L. The final output signal is output through speaker.
- 10 -
ADJUSTMENT
All adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several minor adjustment may be required. Adjustment should be following procedure and after warming up for a minimum of 10 minutes. Alignment appliances and tools.
- IBM Compatible PC
- Programmable Signal Generator. (eg. VG-819 made by Astrodesign Co.)
- E(E)PROM with each mode data saved.
- Alignment Adapter and Software.
1. Adjustment for Factory Preset Mode
1) Run alignment program for LM505J on the IBM compatible PC.
2) Select EEPROM All Init. command and Enter.
3) Display cross hatch pattern at Mode 1.
4) Select COMMAND PRESET START command.
5) Select EDID WRITE command and Enter.
6) Press “Y”key, it will automatically save all FOS data to EEPROM.
2. Adjustment for White Balance
1) Display color 0,0 pattern at Mode 13.
2) Set External Bright to MAX position and Contrast to MAX Position.
3) Select PRESET START BIAS CAL command and Enter.
4) No attempt to manually adjust, BIAS data is auto­matically adjusted and saved to the EEPROM.
5) Display color 15,0 pattern at Mode 13.
6) Select DRIVE CAL command and Enter.
7) Color 1 (9300K) and Color 2 (6500K) are automatically adjusted and saved to the EEPROM.
8) Select PRESET END command and Enter.
3. DDC Data Write Procedure
1) Use this procedure only when there is some probelm on EDID data.
2) Select EDID Write EDID[A
Φ] command and
Enter.
3) This will write the EDID data to EEPROM.
Figure 1. Cable Connection
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
ST
VGS
MONITOR
E
E
V-Sync On/Off Switch (Switch must be ON.)
F
F
A
A
B
B
C
C
15
10
5
5
69
1
1
1
14
13
25
6
5V
5V
5V
4.7K
4.7K
4.7K
74LS06
74LS06
OFF ON
OFF
ON
11
Video Signal Generator
- 11 -
TROUBLESHOOTING GUIDE
1. NO POWER
CHECK U803.
CHECK
U501 PIN 8
VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK J707
VOLTAGE
PIN1&PIN2(12V)
PIN4(5V)?
NO
CHECK 5VS LINE
(OPEN CHECK)
CHECK
U805 Voltage
(5V) ?
NO
CHECK IIC LINE
CONNECTION
(U501, U502)
CHECK U201 VCC,
XTAL, RESET
IS U201 PIN12
VOLTAGE REPEATED
AS PULSE SHAPE ?
NO
YES
YES
YES
NO PROBLEM
NO
CHECK KEY CONTROL
CONNECTOR ROUTINE
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