SPECIFICATIONS LCD CHARACTERISTICS : TFT XGA LCD : 15.1inch (38.35cm)

Transcription

1 . LCD CHARACTERISTICS Type : TFT XGA LCD Size : 5.inch (38.35cm) Pixel Pitch : 0.3mm x 0.3mm Pixel Format : 024 x 768 pixels (XGA) RGB Stripe Arrangement Color Depth : 8-bit, color(24bits) Active Video Area : 307mm x 230mm Surface Treatment : Anti-Glare, Hard Coating (3H) Backlight Unit : Two-CCFL (Cold Cathode Fluorescent Lamp) 2. OPTICAL CHARACTERISTICS 2-. Viewing Angle by Contrast Ratio 0 Left : 60 typ., 55 min. Righ : 60 typ., 55 min. Top : 45 typ., 40 min. Bottom: 45 typ., 40 min Luminance : 200 cd/m 2 typ Angle at Half Luminance Left : 50 min. Right : 50 min. Top : 45 min. Bottom : 30 min Contrast Ratio : 200 typ. 3. SIGNAL (Refer to the Timing Chart) 3-. Sync Signal ) Type : Separate Sync. (Horizontal & Vertical) 2) Input Voltage Level : Low=0~0.8V, High=2.~5.5V 3) Sync Polarity : Positive or Negative 3-2. Video Input Signal ) Type : R, G, B Analog 2) Voltage Level : 0~0.74 V a) Color 0, 0 : 0 Vp-p b) Color 7, 0 : Vp-p c) Color 5, 0 : 0.74 Vp-p 3) Input Impedance : 75 Ω 3-3. Operating Frequency Horizontal Vertical : 3 ~ 69kHz : 56 ~ 85Hz SPECIFICATIONS 4. POWER SUPPLY 4-. Power Adaptor Input : AC 00~240V, 50/60Hz.2A-0.6A Output : DC 24V 2.0A Power Consumption MODE H/V SYNC VIDEO POWER CONSUMPTION LED COLOR POWER ON (RMAL) STAND-BY SUSPEND OFF POWER OFF ON/ON OFF/ON ON/OFF OFF/OFF - ACTIVE OFF OFF OFF - less than 48 W less than 3 W less than 3 W less than 3 W less than 3 W GREEN ORANGE ORANGE ORANGE OFF 5. ENVIRONMENT 5-. Operating Temperature: 0 C~35 C (50 F~95 F) (Ambient) 5-2. Relative Humidity : 0%~80% (Non-condensing) 5-3. Altitude : 0~0,000ft (3,030m) 6. DIMENSIONS (with TILT/SWIVEL) Width : 394 mm (5.5'') Depth : 24.7 mm (8.45'') Height : mm (5.66'') - 576LU ~ mm (5.66'' ~ 8.6'') - 577LH, 577LM 7. WEIGHT (with TILT/SWIVEL) 577LM 577LH 576LU Net. Weight 5.7 kg (2.57 lbs) (Speaker: kg) 5.7 kg (2.57 lbs) 5.5 kg (2.3 lbs) 8. USB Upstream : port, Downstream : 4 port Speed : High-2Mbps, Low-.5Mbps Gress. Weight 8.6 kg (8.96 lbs) 7.6 kg (6.76 lbs) 7.4 kg (6.32 lbs) 9. AUDIO (Option) Input : Max 700mVrms S/N : More than 43dB (at 50mW output, khz) Distortion : Less than 2% (at 50mW output, khz) Amp Output : WW (at khz, THD 20%) Cross-talk : More than 30dB (at 50mW output, khz) - 2 -

2 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. Do not modify original design without obtaining written permission from LG 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.) CAUTION Please use only a plastic screwdriver to protect yourself from shock hazard during service operation. 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. CAUTION IF BRIGHTNESS OF THE LCD MODULE DARKEN, REPLACE THE BACKLIGHT ONE OR ALL. There is two backlight, must distinguish between the top (upper) and the bottom (lower), and be careful of treatment it. MTBF (Mean Time Between Failure) of a backlight is about 30,000 hours. Bottom (Lower) Backlight Ass y (P/N: 693TZZ00E) Top (Upper) Backlight Ass y (P/N: 693TZZ00D) - 3 -

3 TIMING CHART VIDEO B A SYNC C D F E MODE H / V Sync Polarity Dot Clock Frequency KHz 70.0 Hz KHz 70.0 Hz KHz 60.0 Hz KHz Hz KHz 75.0 Hz KHz 85.0 Hz KHz Hz KHz 60.3 Hz KHz Hz KHz 75.0 Hz KHz Hz KHz Hz KHz 60.0 Hz KHz 70.0 Hz KHz 75.0 Hz KHz 85.0 Hz Total Period ( E ) Video Active Time ( A ) Blanking Time ( B ) Sync Duration ( D ) Back Porch ( F ) Front Porch ( C ) Resolution 640 x x 400 (TEXT) 640 x x x x x x x x x x 624 (MAC) 024 x x x x

4 SCHEMATIC DIAGRAM. TDA8752 (PRE-AMP/PLL/ADC)

5 2. VIDEO PROCESS

6 3. PANEL-LINK FOR 8 Bit

7 4. MEMORY

8 5. MICOM

9 6. POWER GEN

10 7. CONNECTOR & JACKS

11 8. AUDIO POWER

12 9. AUDIO

13 0. AUDIO

14 . USB

15 WIRING DIAGRAM CN3 J2 CN J3 J4 J4 CN2 J J3 P4 J0 J - 0 -

16 BLOCK DIAGRAM System Block Diagram INVERTER PCB POWER SUPPLY POWER CORD 5-pin D-SUB SIGNAL CABLE MAIN LOGIC PCB CONTROL PCB LCD MODULE - 3 -

17 R G B HS/VS BLOCK DIAGRAM FOR Flatron LCD 577LM/ 577LH/ 576LU I2C Digital Video Pr ocessor MX88L284 24bit Video 5V 5V Module Analog Switch Dot clock System Controll er MC68HC05BD48 DC/DC Converter (L4973D5.) Control REG REG REG REG REG Li nk Connector 5PIN 3 ROW D-SUB 5V 5VPLL 5VANA MEMORY 2M Byte * 3 /WR /RD Control 3.3VD PRE AMP ADC PLL TDA8752B 8 BIT 8 BIT 8 BIT Clamp 3.3VD Control Signal Panel Li nk Transmit ter ( Sil 00 ) TMDS 5VST 5VPLL 3.3VD2 3.3VD 5V SDA/SCL Buf fer H-sy nc V-sync AD DR DA TA 0 6 H-sy nc V-sync I2C 8bit Communi cation 3.3VD2 EEPROM (24LC08B) 24V GND Power Connector 24V 5VST < MAIN > L R AUDIO AMP TDA7496L MUTE V V- 3.3V DC/DC Converter (L4973D5.) Audio signal input SHUT DOWN < AUDIO > - Option DOWN STREAM * 4 5V DATA REG 3.3V USB HUB IC (TUSB2046B) DC/DC Converter (L4973D5.) UPSTREAM < USB > - 4 -

18 DESCRIPTION OF BLOCK DIAGRAM FOR 577LM/ 577LH/ 576LU. Video Amp & PLL & A/D Converter Circuit TDA8752 (U) is one chip IC which it supports three function block of Video Amp, PLL and A/D converter. Video signal (0.7Vp.p) clamped through C6, 7, 6 inputs to U8 s R, G, and B pins. The signal level is 0.7Vac added 3Vdc. This signal is processed as a proper 8 bit digital signal for input of MX88L284 (U5) by U s amplifying, phase locking, and A/D converting operation. U generates clock and horizontal sync for MX88L284 (U5) with D-sub (J) s input horizontal sync signal. MX88L284 (U5) s clamp output makes U keep video signal s black level constantly regardless of various input video signals. 2. Macronix Circuit (Scaler chip) The MX88L284 (U5) gets the video signal converted analog to digital from U, and carries out four function of image processing that interpolates input signal less than 024x768 resolution to that of 024x768 resolution, displays one to one image without interpolation, mixes OSD(On Screen Display) signal by interfacing with internal OSD IC, and controls two memories(u6, 7) as frame converter. U5 outputs signals of HSYNC-OUT, VSYNC-OUT, DEN, CLKA- ODD, and each 8 bit R, G, B to transmitter IC (U6). 3. Memory Circuit 2M byte SDRAM(U6, 7) is used as a frame converter for supporting up to 85 Hz frame rate and controlled by MX88L284(U5). The control signals are CKA, CLK, UDOM, LDOM, /WE, /CAS, /RAS, /CS, /BA. 4. Panel-Link Circuit Panel link transmitter (U6) delivers digital signal to the receiver inside LCD module by method of abstraction. The abstracted signals are pairs of TX0-, TX-, TX2-, TXC- of which voltage swing is 0.5V each. Its swing is similar to LVDS (Low Voltage Differential Signal). Transmitter (U6) gets signals of HSYNC-OUT, VSYNC-OUT, DEN, CLKA-ODD from U5, and outputs TMDS (Transition Minimized Differential Signal) through TX pins. When PD pin s input is low, transmitter goes to power down mode. 5. System Controller (Microprocessor) Circuit ) Microprocessor (U4) distinguishes polarity and frequency by calculating horizontal and vertical sync input from signal source. 2) Microprocessor (U4) carries out power control by sending power-down trigger signal to each IC. U, U5, U6, and U3 has PD(Power-down) pin which operates at active-low or high. It also outputs signal to turn inverter on and off for lamp control. 3) Microprocessor (U4) communicates with EEPROM (U3), TDA8752 (U), and MX88L284 (U5 through IIC(2 lines) or 8 bit bus line. It makes all devices operated properly with communication channel. 4) Microprocessor (U4) let User adjust screen by each OSD function. 6. DC/ DC Converter This circuit supplies DC power for each device needing DC voltage of3.3vd, 3.3VD2, 5V, 5VPLL, and 5VST. L4973D5.(U3), the DC/DC controller IC converts input 24Vdc into 5Vdc and 3.3Vdc with peripheral circuit composed of Transformer (TRANS), condensing components (ZD5, D6, C20, C26, C72, C73) and Regulators (U7, U2, U24). 5VST is supplied for Microprocessor through regulators (U, U22). 5VMOD for LCD module power are switched by U2, switching FET, controlled by Microprocessor

19 TROUBLESHOOTING GUIDE. POWER POWER (POWER INDICATOR OFF) CHECK J S VOLTAGE (24V)? CHECK ADAPTER, AND FIND OUT A SHORT POINT AS OPENING EACH POWER LINE CHECK U22 PIN5 VOLTAGE (5V)? CHECK U22, U. CHECK U7 Voltage (5V)? CHECK T S PRIMARY COIL (OPEN CHECK) PROBLEM CHECK KEY CONTROL CONNECTOR ROUTINE U3 S PIN 0V? IS U5 PIN2 VOLTAGE REPEATED AS PULSE SHAPE? CHECK U3, AND CHECK 5VA LINE CHECK IIC LINE CONNECTION (U3, U) CHECK U4 S VCC, XTAL, RESET - 7 -

20 2. RASTER (OSD IS T DISPLAYED) INVERTER RASTER (OSD IS T DISPLAYED) J4 PIN0 24V? CHECK ADAPTER J4 PIN5 5V? CHECK MICOM INV ON/OFF PORT. J4 PIN 5V?. CONFIRM BRIGHTNESS OSD CONTRL STATE. 2. CHECK MICOM DIM-ADJ PORT CHECK PULSE AS CONTACTING SCOPE PROBE TO CAUTION LABEL. (CONTACT PROBE TO CAUTION LABEL. CAN YOU SEE PULSE AT YOUR SCOPE? REPLACE INVERTER ASS Y REPLACE CCFL LAMP IN THE LCD MODULE - 8 -

21 3. RASTER (OSD IS T DISPLAYED) MX88L284 RASTER (OSD IS T DISPLAYED) U5 POWER PINS 3.3V? CHECK U2, U24 U5 PIN34, 35 OSCILLATE AS 4.3M?. CHECK PIN34, 35 SOLDERING CONDITION 2. CHECK X 3. TROUBLE IN U5 J5 PIN2 IS 65MHz CLOCK? PIN4 IS 48KHz H-SYNC? PIN5 IS 60Hz V-SYNC? PIN37 IS 48KHz H-SYNC? IS PULSE APPEARED AT SIGNAL PINS? CHECK U5 S SOLDERING CONDITION AND CHECK CONNECTION LINE FROM U5 TO J5 IS APPEAR LOW VOLTAGE SIGNAL AT J4? CHECK SOLDERING STATE OF U6 J4 PIN4 5V? CHECK U2 TROUBLE IN CABLE OR LCD MODULE - 9 -

22 4. RASTER (OSD IS DISPLAYED) TDA8752BH RASTER (OSD IS DISPLAYED) U POWER PIN 5V? CHECK U7, 5V U PIN3 2.5V? CHECK U0 CHECK R,G,B INPUT? U PIN 2, 20, 28. CHECK PC 2. CHECK SIGNAL CABLE & D-SUB CONNECTOR LINE CHECK IIC PULSE? U PIN32, 33 CHECK IIC LINE CHECK CKREF(H-SYNC) INPUT? U PIN94 CHECK H-SYNC LINE (D-SUB U8 MICOM U PIN95) CHECK H-SYNC INPUT? U PIN90? CHECK CKREF INPUT

23 4. RASTER (OSD IS DISPLAYED) TDA8752BH / MX88L284 CHECK OE(H-SYNC)? U PIN87 CHECK H-SYNC LINE (D-SUB U8 MICOM U PIN95) CHECK CLAMP INPUT(H-SYNC)? U PIN89 CHECK SIGNAL LINE FROM U5 PIN TO U PIN89 CHECK H-SYNC INPUT? U5 PIN203 CHECK SIGNAL LINE FROM U2 PIN80 TO U5 PIN203 CHECK CLOCK INPUT (25MHz-95MHz SINEWAVE)? U5 PIN207 CHECK SIGNAL LINE FROM U PIN84 TO U4 PIN254 (024x768/85Hz : 95MHz) - 2 -

24 24V 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 0 minutes. Alignment appliances and tools. - IBM Compatible PC - Programmable Signal Generator. (eg. VG-89 made by Astrodesign Co.) - E(E)PROM with each mode data saved. - Alignment Adapter and Software.. Adjustment for Factory Preset Mode ) Run alignment program for 577LM/577LH/576LU on the IBM compatible PC. 2) Select EEPROM all clear command and Enter. 3) Display cross hatch pattern at Mode. 4) Select COMMAND PRESET START command. 5) Select FOS DEFAULT command and Enter. 6) Press "Y" key, it will automatically save all FOS data to EEPROM. 2. Adjustment for White Balance ) Display color 0,0 pattern at Mode 3. 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 5,0 pattern at Mode 3. 6) Select DRIVE CAL command and Enter. 7) Color (9300K) and Color 2 (6500K) are automatically adjusted and saved to the EEPROM. 8) Select PRESET EXIT command and Enter. 3. DDC Data Write Procedure ) Use this procedure only when there is some probelm on EDID data. 2) Select EEPROM EDID Write command and Enter. 3) This will write the EDID data to EEPROM. AUDOI DC OUT A IBM Compatible PC C Control Line C A Not used PARALLEL RS232C VGS MONITOR V-SYNC ST POWER 220 Power inlet (required) Power Select Switch (0V/220V) Power LED PARALLEL PORT 5V OFF F ON ON OFF E V 74LS06 4.7K 5V 4.7K 4.7K 74LS06 4 B E ST Switch B F V-Sync On/Off Switch (Switch must be ON.) Figure. Cable Connection - 6 -

25 24V DISASSEMBLY. TILT/SWIVEL REMOVAL ) Remove speaker from the Monitor. (Push the speaker in arrow direction.) 2) Remove Hinge Cover. (Pull the tilt cover both bottom side). 3) Remove four screws. 4) Remove the Tilt/swivel. Hinge Cover speaker 2. BACK COVER REMOVAL ) Remove four sheet from Back Cover. 2) Remove four screws (b) from the Back Cover. 3) Remove the Back Cover. 3. TOP SHIELD & INVERTER SHIELD& D-SUB PCB ASS Y REMOVAL ) Remove eleven screws. 2) Remove the Top Shield and Inverter Shield. 3) Remove two screws (b). 4) Remove the D-Sub PCB Ass y. Back Cover (b) (b) (b) (b) (b) - -

26 (b) J2 (b) J4 (c) (c) J0 (b) (c) (c) (b) (c) 4. CONTROL, MAIN PCB ASSEMBLY REMOVAL ) Remove six screws. 2) Remove the Cabinet Ass y. 3) Disconnect J2, J4 and J0. 4) Remove four screws (b). 5) Remove the Main PCB Ass y. 5) Remove five screws (c). 6) Remove the Control PCB Ass y. 5. BACKLIGHT REMOVAL ) Remove two screws. 2) Remove the Backlight from the LCD Module. 6. LCD MODULE REMOVAL ) Remove four screws. 2) Separate the LCD Module from the Main Frame. Top (Upper) Backlight Ass y LCD Module Bottom (Lower) Backlight Ass y - 2 -

27 CONTROL LOCATIONS MAIN PCB CONTROL PCB Control Function POWER SWITCH SET LEFT UP DOWN RIGHT OSD - 0 -

28 EXPLODED VIEW (Flatron LCD 577LM & 577LH) EXPLODED VIEW PARTS LIST (Flatron LCD 577LM & 577LH) Ref. No. Part No. Description Q'ty Material 7 309TKL09C 309TKL09J CABINET ASS Y (For 577LM) CABINET ASS Y (For 577LH) LGC ABS HF350U TLT5F LCD MODULE TKK20A 6632Z-502A 495TKS050A BRACKET INVERTER ASS Y INVERTER ASS Y MAIN FRAME ASS Y 6 687TMT59A MAIN PCB ASS Y TKK205A METAL REAR ASS Y TKT05A 687TKT03A 687TST58A INTERFACE ASS Y (For 577LM) INTERFACE ASS Y (For 577LH) POWER KEY TOTAL TST57A 3809TKL00G 3809TKL00F BWF CONTROL PCB ASS Y BACK COVER ASS Y (For 577LM) BACK COVER ASS Y (For 577LH) SCREW 4 LGC HF 350U 3 MCC SCREW TKK059A TILT SWIVEL ASS Y LGC HF 350U TKK23A 6634TBZ0A 6866TD900F COVER, STAND TOP REAR ADAPTER, AC-DC 00~240V, 24V, 2A SIGNAL CABLE TKS033A 355TKS032A SPEAKER ASS Y (LEFT), 577LM Only SPEAKER ASS Y (RIGHT), 577LM Only 3 4