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COLOR MONITOR SERVICE MANUAL
CHASSIS NO. :
MODEL:
W1542S
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the MSTAR Chip.
Copyright 2008
LG Electronics. Inc. All right reserved.
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LGE Internal Use
Only Only for training and service purposes
CONTENTS
SPECIFICATIONS ................................................... 2 PRECAUTIONS ....................................................... 3 TIMING CHART ....................................................... 7 DISASSEMBLY........................................................ 8 BLOCK DIAGRAM...................................................10 DISCRIPTION OF BLOCK DIAGRAM ................... 11 ADJUSTMENT ...................................................... 13 SERVICE OSD ............................................... .........16 TROUBLESHOOTING GUIDE .............................. WIRING DIAGRAM ............................................... 17 24
EXPLODED VIEW ................................................... 25 REPLACEMENT PARTS LIST ............................... 26 SCHEMATIC DIAGRAM ......................................... 27
SPECIFICATIONS
1. LCD CHARACTERISTICS Type : TFT Color LCD Module Active Display Area : 15 inch Pixel Pitch : 0.2595x 0.2595(mm) Color Depth : 16.7M 5. POWER SUPPLY 5-1. Power : 90 ~ 264 Vac / 50 ~ 60 Hz 5-2. Power Consumption
Status Power On Power Saving Power Off
Hon off on off --
Vsy nc on on off off --
Video active blanked blanked blanked --
Power 22W < 1W < 1W < 1W < 1W
LED BLUE Amber Amber Amber Off
Size Electrical Interface Surface Treatment Operating Mode Backlight Unit
: 332.16 (H) x186.84(V)mm : one channel LVDS : Anti-glare , Hardness (3H) : Normal white : Top/Bottom edge side 2-CCFL
2. OPTICAL CHARACTERISTICS 2-1. Viewing Angle by Contrast Ratio Left 45°/Right45°;up 20°/down 40°CR10 2-2. Luminance 200cd/m2 (Min.)/ 6500k;150 cd/m2 (Min.)/9300k 2-3. Contrast Ratio 500:1(typ)/5000:1(DCR) 3. SIGNAL (Refer to the Timing Chart) 3-1. Sync Signal Type: Separate TTL; Sync On Green 3-2. Video Input Signal 1) Type 2) Voltage Level 3) Input Impedance : Analog : 700 mV +/- 5% (P-P) : 75ohm
6. ENVIRONMENT 6-1. Operating Temperature : 0°C to 40°C 6-2. Relative Humidity : 20~80 % 6-3. MTBF : 60,000 HRS with 90% Confidence Lamp Life : 40,000 Hours(Min) 7. DIMENSIONS (with TILT/SWIVEL) Width: 364.8mm Depth: 206mm (W Base), 71.2mm (W/O Base), 58.65mm(W/O STAND&BASE) Height: 315.7mm (W Base), 313.4mm (W/O Base),253mm(W/O STAND&BASE) 8. WEIGHT (with TILT/SWIVEL) Net. Weight Gross Weight : 2.1+/-0.5kg : 2.3+/-0.5kg
3-3. Operating Frequency Horizontal : 30KHz~61KHz Vertical : 56Hz~75Hz 4. Max. Resolution: 1280*720@75Hz
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PRECAUTION
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. ·
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. · Be careful while tilting and rotating the monitor to avoid pinching hand(s)
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.
·
Leakage Current Hot Check Circuit
AC Volt-meter
·
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.)
To Instrument's exposed METALLIC PARTS
Good Earth Ground such as WATER PIPE, CONDUIT etc.
· · · · · ·
1.5 Kohm/10W
CAUTION
Please use only a plastic screwdriver to protect yourself from shock hazard during service operation.
Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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LGE Internal Use Only
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1. Always unplug the receiver AC power cord from the AC power source before; a. Removing or reinstalling any component, circuit board module or any other receiver assembly. b. Disconnecting or reconnecting any receiver electrical plug or other electrical connection. c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard. d. Discharging the picture tube anode. 2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe. Do not test high voltage by "drawing an arc". 3. Discharge the picture tube anode only by (a) first connecting one end of an insulated clip lead to the degaussing or kine aquadag grounding system shield at the point where the picture tube socket ground lead is connected, and then (b) touch the other end of the insulated clip lead to the picture tube anode button, using an insulating handle to avoid personal contact with high voltage. 4. Do not spray chemicals on or near this receiver or any of its assemblies. 5. Unless specified otherwise in this service manual, clean electrical contacts only by applying the following mixture to the contacts with a pipe cleaner, cottontipped stick or comparable non-abrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol (90%-99% strength) CAUTION: This is a flammable mixture. Unless specified otherwise in this service manual, lubrication of contacts in not required. 6. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this service manual might be equipped. 7. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed. 8. Always connect the test receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead. Always remove the test receiver ground lead last. 9. Use with this receiver only the test fixtures specified in this service manual. CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver. Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static by static electricity. 1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed to prevent potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static type solder removal device. Some solder removal devices not classified as "antistatic" can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ES device.)
Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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LGE Internal Use Only
General Soldering Guidelines 1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will maintain tip temperature within the range or 500to 600 F F. 2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead. 3. Keep the soldering iron tip clean and well tinned. 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-bristle (0.5 inch, or 1.25cm) brush with a metal handle. Do not use freon-propelled spray-on cleaners. 5. Use the following unsoldering technique a. Allow the soldering iron tip to reach normal temperature. (500to 600 F F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suction-type solder removal device or with solder braid. CAUTION: Work quickly to avoid overheating the circuitboard printed foil. 6. Use the following soldering technique. a. Allow the soldering iron tip to reach a normal temperature (500to 600 F F) b. First, hold the soldering iron tip and solder the strand against the component lead until the solder melts. c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil. CAUTION: Work quickly to avoid overheating the circuit board printed foil. d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush. IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. Removal 1. Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts. 2. Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC.
Replacement 1. Carefully insert the replacement IC in the circuit board. 2. Carefully bend each IC lead against the circuit foil pad and solder it. 3. Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas). "Small-Signal" Discrete Transistor Removal/Replacement 1. Remove the defective transistor by clipping its leads as close as possible to the component body. 2. Bend into a "U" shape the end of each of three leads remaining on the circuit board. 3. Bend into a "U" shape the replacement transistor leads. 4. Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the "U" with long nose pliers to insure metal to metal contact then solder each connection. Power Output, Transistor Device Removal/Replacement 1. Heat and remove all solder from around the transistor leads. 2. Remove the heat sink mounting screw (if so equipped). 3. Carefully remove the transistor from the heat sink of the circuit board. 4. Insert new transistor in the circuit board. 5. Solder each transistor lead, and clip off excess lead. 6. Replace heat sink. Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicular y to the circuit board. 3. Observing diode polarity, wrap each lead of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. Inspect (on the circuit board copper side) the solder joints of the two "original" leads. If they are not shiny, reheat them and if necessary, apply additional solder. Fuse and Conventional Resistor Removal/Replacement 1. Clip each fuse or resistor lead at top of the circuit board hollow stake. 2. Securely crimp the leads of replacement component around notch at stake top. 3. Solder the connections. CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.
LGE Internal Use Only
Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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Circuit Board Foil Repair Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds the foil to the circuit board causing the foil to separate from or "lift-off" the board. The following guidelines and procedures should be followed whenever this condition is encountered. At IC Connections To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections). 1. Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary). 2. carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern. 3. Bend a small "U" in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection. 4. Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.
At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board. 1. Remove the defective copper pattern with a sharp knife. Remove at least 1/4 inch of copper, to ensure that a hazardous condition will not exist if the jumper wire opens. 2. Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern. 3. Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side. Carefully crimp and solder the connections. CAUTION: Be sure the insulated jumper wire is dressed so the it does not touch components or sharp edges.
Copyright ©2008 LG Electronics. Inc. All right reserved. Only for training and service purposes
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LGE Internal Use Only
TIMING CHART
VIDEO
E D B
A
SYNC
C
M
Display Modes 1 2 3 4 5 6 7 8 9 10 11 640 x 350 720 x 400 640 x 480 640 x 480 800 x 600 800 x 600 832 x 624 1024 x 768 1024 x 768 1280 x 720 1280 x 720
Horizontal Freq. (kHz) 31.469 31.468 31.469 37.500 37.879 46.875 49.725 48.363 60.123 44.772 56.456
Vertical Freq. (Hz) 70.09 70.08 59.94 75 60.137 75 74.55 60 75.029 59.855 74.777
Dot Clock (MHz) 25.175 28.321 25.175 31.5 40 49.5 57.283 65 78.75 74.500 95.750
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DISASSEMBLY
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BLOCK DIAGRAM
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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 96MHz. This part consists of the Scaler, ADC convertor and LVDS transmitter. The Scaler gets the video signal converted analog to digital, interpolates input to 1280*720resolution 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 3.3V in Power board. 14V is provided for inverter, 14V is provided for LCD panel and 3.3V for micom. Also, 3.3V is converted 1.8V by regulator. Converted power is provided for IC in the main board. The inverter converts from DC14V to AC 700Vrms and operates back-light lamps of module. 3. MICOM Part. This part is include video controller part. And this part consists of Flash which stores control data, and the Micom which imbedded in scaler IC. The Micom distinguishes polarity and frequency of the H/V sync are supplied from signal cable. The controlled data of each modes is stored in Flash.
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LIPS Board Block Diagram
50-60HZ
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 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 achive the dc output stablize, 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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LGE Internal Use Only
ADJUSTMENT
1. Software: a.port95nt.exe b.Edid.exe c.Writing data: Mars W1542S 2. Hardware a. PCwinXP, win2000 or win981 pc b. Writing toolsIncluding EDID writing cardconnecting cable etc. 3. EDID Writing Connection
Figure 1
Figure 2
Figure 3
4. EDID Writing SOP: a. Select "File submenuselect "Auto Write".
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b. Select "Model" of main menu. Password: 1234
c. Select written model W1542S
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d. Input product serial number (The SN is 12 numbers) in "S/N"Column, then the program auto writing start.
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SERVICE OSD
1) Press MENU Key and Power Key, Monitor Will Enter Service OSD. 2) 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) MODULE : Show Current module Type e) LG LOGO: ON OFF. (Yes or No to display the Splash OSD in AC/DC power On time.) f) DFC: ON OFF. (Yes or No to apply the operation of DFC function.) g) NVRAM INIT : EEPROM initialize.(24C04) h) R/G/B-9300K : Allows you to set the R/G/B-9300K value manually. i) R/G/B-6500K : Allows you to set the R/G/B-6500K value manually. j) R/G/B-Offset : Allows you to set the R/G/B-Offset value manually.(Analog Only) k) R/G/B-Gain : Allows you to set the R/G/B-Gain value manually.(Analog Only) l) RS232: Enable/Disable Debug Mode(on/off) m) sRGB: Allows you to set the sRGB value manually
ISP Board Parallel Port Insert to Parallel Port on PC
D-SUB 15PIN
LCD Monitor DSub
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TROUBLESHOOTING GUIDE
1. No Power & Power LED Off
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2. Backlight can't be turned on
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3. DC output voltage is unstable
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4. Backlight turn on and turn off soon
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5.Black Screen and backlight turn on
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6. White Screen
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7. BAD SCREEN
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WIRING DIAGRAM
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Exploded View and Parts List
050
080 070
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120 090 110 130 100 140 160
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060 020 030 040 010 150
LGE Internal Use Only
Item 10 20 30 40 50 60 70 80 90 100 110 120
LGE PN COV30076101 EBU60134602 EBU60134603 EBU60134601 ACQ71991201 ACQ71995201 ACQ71995301 MCK60958301 MDQ60958401 COV30076402 COV30076002 COV30007703 EAD37992102
INL PN 631102050570R 792061300700R 792061400700R 792051500000R 714020015700R 714030020100R 714050018900R 501260209500R 502090200800R 430300802320R 430302000290R 453010100340R 453070800730R
6410TAW001A 453070800490R 130 6410TUW008A 453070800150R 6410TIW006B 453070800030R 6410TEW011A 453070809250R 140 MAY57632701 506020027000R
Descriptions Usage MOQ LCP 15'' M150EW02-V0 (A)(AUO)RoHS 1 20 PCBA,I/F BOARD,W/O SPK,LE15K1-710 ROHS 1 20 PCBA,P/I BOARD,W/O SPK,LE15K1-710 ROHS 1 20 PCBA,KEYPAD BOARD,LE18K2 ROHS 1 20 ASSY,BASE ,LE18K2 1 20 Assy,bezel,black,LE15K1 1 20 Assy,back cover,LE15K1 1 20 STAND ,LE18K2 1 20 Chassis,LE15K1 1 20 HRNASS'Y 2X4P TO 1X8P 190mm UL1571#28 1 20 HRN LVDS FFC 20P 170MM 1 20 CABLE D-SUB 15P MALE 1850mm BLACK/BLUE R 1 20 PWRCORD 16A/250V BLK 6FT VDE,H05VV-F 3Cx 1 20 ---Europe/Russia/Peru PWRCORD 16A/250V BLK 6FT SABS H05VV-F 3G 1 20 ---South Africa PWR CORD 10A/125V BLK 6FT UL/CSA,SVT 3Cx 1 20 ---US/Mexico/Panama/Canada PWRCORD 6A/250V BLK 1800mm,STQC H05VV-F 1 20 ---India PWRCORD 10A/250V BLK 6FT IMQ H05VV-F 3Gx 1 20 ---Italy(Chile) CARTON LG W/W W1542S(LE15K1) 1 20 CARTON LG USA/CANADA W1542S(LE15K1) Cushion,EPS-L,LE15K1 Cushion,EPS-R,LE15K1 1 1 1 20 20 20
MAY57632702 506020027001R 150 MFZ60958801 506060012600R 160 MFZ60958802 506060012610R
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SCHEMATIC DIAGRAM
1. DC to DC
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2. Input
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3. Scaler_TSUM1PFR-LF
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4. Keypad
5. Inverter
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6. Power
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P/NO :
. 2008 Printed in Korea
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