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Internal Use Only
Website:http://biz.LGservice.com
COLOR MONITOR
SERVICE MANUAL
CHASSIS NO. : LM57B
MODEL: L1733TR (L1733TR-SFQ.A**MQP)
L1933TR (L1933TR-SFQ.A**MQP,A**RQP)
( ) **Same model for Service
CAUTION
BEFORE SERVICING THE UNIT,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
*To apply the MSTAR Chip.
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CONTENTS SPECIFICATIONS ................................................... 2 SERVICE OSD ........................................................17 PRECAUTIONS ....................................................... 3 TROUBLESHOOTING GUIDE .............................. 18 TIMING CHART ....................................................... 7 WIRING DIAGRAM ............................................... 24 DISASSEMBLY ....................................................... 8 EXPLODED VIEW.....
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PRECAUTION WARNING FOR THE SAFETY-RELATED COMPONENT. WARNING BE CAREFUL ELECTRIC SHOCK ! • There are some special components used in LCD monitor that are important for safety. These parts are • If you want to replace with the new backlight (CCFL) or marked on the schematic diagram and the inverter circuit, must disconnect the AC adapter replacement parts list. It is essential that these critical because high voltage appears at inverter circuit about parts should be replaced with the manufactu
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SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in service manual and its supplements and addenda, read this service manual. and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication. to any heat sink in this receiver. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the Electrostatically Sensitive
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General Soldering Guidelines Replacement 1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad and solder it. temperature within the range or 500 F to 600 F. 3. Clean the soldered areas with a small wire-bristle 2. Use an appropriate gauge of RMA resin-core solder brush. (It is not necessary to reapply acrylic coating to co
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Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off" the board. The following guidelines and component side of the circuit board. procedures should be fol
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TIMING CHART VIDEO A E D B SYNC C Total Video Sync Front Blanking Sync Dot MODE H / V Frequency Period Active Duration Porch Time Resolution Polarity Clock ( E ) Time ( A ) ( D ) ( C ) ( B ) 1 H(Pixels) + 25.175 31.469 800 640 16 96 48 640 x 350 V(Lines) - 70.09 449 350 37 2 60 2 H(Pixels) - 28.321 31.468 900 720 18 108 54 720 X 400 V(Lines) + 70.08 449 400 12 2 35 3 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480 V(Lines) - 59.94 525 480 10 2 33 4 H(Pixels) - 31.5 37.5 840 640 16 64 120 6
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DISASSEMBLY-Set # 1 # 2 Soft pad on the table. Monitor on the pad. # 3 # 4-1 Hold the head & stand base and then Pull up the stand part. Twist Stand until "Click". # 4-2 # 5 Separate head & stand LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 8 - Only for training and service purposes
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# 6 # 7 1. Pull the front cover upward. Remove the screws. 2. Then, let the all latches are separated.(#3-1~3-2) 3. Put the front face down. # 8 # 9 Disassemble back cover. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 9 - Only for training and service purposes
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DISASSEMBLY-Stand * In case of Latch 4. # 1-1 # 1-2 Push the four latches on the bottom to the outside and Separate Stand Body & Base. (Reference the #1-2) # 2 # 3 After finished repair, necessarily push 4ea Latches to inside for restoration. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 10 - Only for training and service purposes
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DISASSEMBLY-Stand * In case of Latch 2. # 1 # 2 Hold the stand body. Confirm two latch of right and left. # 3 # 4 Push the latch to the inside. Push the base to the opposite direction. # 5 Confirm the condition of separation. LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 11 - Only for training and service purposes
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BLOCK DIAGRAM LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 12 - Only for training and service purposes TSUMx6AL 5V Line Buffer MStarACE LVDS 3.3V ADC Vcc Analog (R/G/B) LVDS 5V Scaler Tx TMDS Rx Digital OSD MCU 1.8V Intel8032 SSC EEPROM (EDID) SDA /SCL EEPROM LIPS Flash ROM (System) 3.3V 3.3V 5V 3.3V Filter 12V Regulator 1.8V 5V 12V Inverter (4 lamps) DVI-D D-Sub 12V KEY Module
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BLOCK DIAGRAM-POWER LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All right reserved. - 13 - Only for training and service purposes POWER INVERTER 12V Module Vcc High 5V Main Board Over (Scaler & Inverter On/OFF (3.3V) Voltage DC DC Protection Dimming (Lamp Current Control) 13V converter) Aux 12V P-ch Inverter Drive Control Inverter 5V Power IC Trans LAMP SMPS Control IC N-ch Start Drive Block Feedback Lamp Low Current Line Filter Feedback LN
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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 convertor, TMDS receiver and LVDS transmitter. The Scaler gets the video signal converted analog to digital, interpolates input to 128
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LIPS Board Block Diagram 12V 50 ~ 60Hz 5V 100KHz HVDC SWITCHING EMI INPUT RECTIFIER OUTPUT RECTIFIER TRANSFORMER COMPONENTS AND FILTER AND FILTER LINE GND 100 ~ 240V SIGNAL PWM CONTROL COLLENT- PHOTO-COUPLER CIRCUIT ION ISOLATION PRIMARY SECONDARY 12V INVERTER CIRCUIT High Voltage 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 cou
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ADJUSTMENT Windows EDID V1.0 User Manual 2. EDID Read & Write 1) Run WinEDID.exe Operating System: MS Windows 98, 2000, XP Port Setup: Windows 98 => Don’t need setup Windows 2000, XP => Need to Port Setup. This program is available to LCD Monitor only. 1. Port Setup a) Copy “UserPort.sys” file to “c:\WINNT\system32\drivers” folder b) Run Userport.exe 2) Edit Week of Manufacture, Year of Manufacture, Serial Number a) Input User Info Data b) Click “Update” button c) Click “ Write” button c)
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220 VGS MONITOR SERVICE OSD 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) Auto Color : W/B balance and Automatically sets the gain and offset value. b) NVRAM INIT : EEPROM initialize.(24C08) c) CLEAR ETI : To initialize using time. d) AGING : Select Aging mode(on/off). e) R/G/B-9300K : Allows you to set the R
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TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) Check Power Board, NO And Find Out a Short Point Check J403 Voltage as Opening Pin5, Pin6 (5V)? Each Power Line YES Check NO Check 3.3V Line U301 Pin2 Voltage (Open Check) (3.3V) ? No Problem YES Check Key Control Connector Routine Is U201 NO Pin75 (3.3V) Check 3.3V Line Voltage ? YES NO Check U201 Pin 96 1 Check X-TAL Pulse YES Check U201 Waveforms 1 U201-#96 LGE Internal Use Only Copyright 2007 LG Electronics. Inc. All rig
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2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS NO RASTER (OSD IS NOT DISPLAYED) CHECK POWER BOARD, J403 NO AND FIND OUT A SHORT PIN5, PIN6 POINT AS OPENING EACH 5V? POWER LINE YES NO CHECK MICOM INV J403 PIN9 ON/OFF PORT. 5V? YES 1. CONFIRM BRIGHTNESS NO OSD CONTRL STATE. J403 PIN10 2. CHECK MICOM DIM-ADJ 5V? PORT YES CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL. NO LIPS (CONTACT PROBE TO CAUTION LABEL. CAN YOU SEE PULSE AT YOUR SCOPE? YES REPLACE CCFL LAMP IN THE LCD MODULE LGE
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3. NO RASTER (OSD IS NOT DISPLAYED) – MSTAR NO RASTER (OSD IS NOT DISPLAYED) U201 NO CHECK U301 PIN 16, 75 3.3V? YES 1. CHECK C210, C211 U201 NO PIN96, 97 SOLDERING CONDITION 1 2. CHECK X201 OSCILLATE AS 14.31MHZ? 3. TROUBLE IN U201 YES U201 PIN27 IS 48KHz H-SYNC? CHECK CONNECTION NO 2 PIN28 IS 60Hz V-SYNC? LINE FROM D-SUB TO IS PULSE APPEARED U201 AT SIGNAL PINS? AT MODE 12? YES TROUBLE IN CABLE OR LCD MODULE Waveforms 1 2 2 U201-#96, 97 U201-#27 H-SYNC U201-#28 V-SYNC LGE Internal Use Only
