Service Manual LCD COLOR MONITOR Model : CML-523BM DAEWOO LUCOMS CO., LTD. http://www.lucoms.com MAY.
CONTENTS SAFETY PRECAUTIONS 2 GENERAL SAFETY INFORMATION 3 SERVICING PRECAUTIONS 4 TECHNICAL INFORMATION 8 GENERAL INFORMATION 8 PIN CONNECTOR 9 CAUTIONS FOR ADJUSTMENT AND REPAIR 9 OPERATION & ADJUSTMENT 10 ALIGNMENT PROCEDURE 16 TROUBLESHOOTING HINTS 17 BLOCK DIAGRAM 25 SCHEMATIC DIAGRAM 26 PCB PATTERN 34 INFORMATION OF PART DESCRIPTION 38 ELECTRICAL PARTS LIST 39 1
SAFETY PRECAUTIONS CAUTION: No modifications of any circuits should be attempted. Service work should be performed only after you are thoroughly familiar with all of the following safety checks and servicing guidelines. ◆ Safety Check Care should be taken while servicing the inverter that generates the high voltage to lighten CCFL of the LCD panel. ◆ Fire & Shock Hazard • Insert an isolation transformer between the analog color display and AC power line before servicing the chassis.
GENERAL SAFETY INFORMATION ◆ Terms in the manual CAUTION Statements identify conditions or practices that could result in damage to the equipment or other property. WARNING Statements identify conditions or practices that could result in personal injury or loss of life. ◆ Terms as marked on equipment CAUTION Statements indicate a personal injury hazard not immediately accessible as one reads the marking or a hazard which is properly included on the equipment itself.
SERVICING PRECAUTIONS CAUTION: Before servicing instruments covered by this service manual, its supplements, and addendum, please read and follow the SAFETY PRECAUTIONS of this manual. NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions on page 1 of this manual, always follow the safety precautions. Remember: Safety First. ◆ General Servicing Precautions 1. Always unplug the AC power cord from the AC power source before: a.
SERVICING PRECAUTIONS ◆ Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are commonly called Electrostatically Sensitive (ES) Devices. The typical examples of ES devices are integrated circuits, 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 electricity. 1.
SERVICING PRECAUTIONS FIGURE 1. USE SOLDERING IRON TO PRY LEADS ◆ IC Removal/Replacement Some utilized chassis circuit boards have slotted (oblong) holes through which the IC leads are inserted and then bent flat against the circuit foil. When holes are slotted, 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 on the page under the title of general soldering guidelines.
SERVICING PRECAUTIONS ◆ Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2. Bend the two remaining leads perpendicularly to the circuit board. 3. Observing diode polarity, wrap each lead out of the new diode around the corresponding lead on the circuit board. 4. Securely crimp each connection and solder it. 5. Inspect the solder joints of the two “original” leads on the circuit board copper side.
TECHNICAL INFORMATION Panel Synchronization Video Bandwidth Max Resolution Colors Display Area PC Input Signal Speaker Plug and Play Power Source Power Consumption Dimension-W x H x D Size Pixel Pitch Viewing Angle Contrast Ratio Brightness Color Filter Horizontal Vertical Sync Video Audio Max. Output Weight-net/gross Power Saving Tilt Range Operating Temperature 15-inch (38cm) diagonal 0.297 x 0.
GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz. This TFT LCD monitor supports IBM PC, PC/XT, PC/AT, personal System/2 (PS/2), Apple Macintosh, and compatible users crisp text and vivid color graphics display when using the following graphics adapters : (VGA, Super VGA, VESA, XGA, SXGA and Apple Macintosh Video Card).
OPERATION AND ADJUSTMENT << L523BM >> Control Panel 2 POWER Indicator Shows both normal operation and power management status with power indicator light. 1 POWER Switches the monitor on and off. 2 AUTO EXIT MENU 1 BRIGHTNESS POWER LIGHT 7 6 3 ( *) 5 4 3 4 Moves cursor to the right or low window in the OSD window and increases the value of any selected function. 5 MENU Turns the OSD window on. 7 AUTO ( * ) Launches the AUTO TRACKING function directly.
OPERATION AND ADJUSTMENT Key Process 1024X768 60K 75 U T I L I TY U TIL ITY U TIL ITY OSD OSD SH AR PN ESS SH AR PN ESS OSD OFF HOT KEY AUTO EXIT AU TO T R AC K I N G POWER LIGHT POWER LIGHT PC MODE When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode. GAME MODE MOVIE MODE The screen will be brightened progressively by 10%.
OPERATION AND ADJUSTMENT Adjustment Procedure No Is the H.Size proper? Adjust the CLOCK control. Yes Is the noise displayed on the screen? Perform the AUTO POSITION. No Yes Perform the AUTO TRACKING. Is the noise displayed on the screen yet? No Yes Adjust the CLOCK FINE until the screen is cleared.
OPERATION AND ADJUSTMENT OSD Functions << OSD FUNCTIONS WITH USING PC >> ICON CONTROL FUNCTIONS VOLUME Adjust audio volume, mute sound. CLOCK Adjust the width (horizontal size) of the screen image. CLOCK FINE Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the CLOCK FINE after the CLOCK adjustment will produce a clear screen. AUTO TRACKING Adjust the horizontal & vertical picture image quality and size.
OPERATION AND ADJUSTMENT ICON CONTROL FUNCTIONS AUTO POSITION Choose automatically the proper horizontal position and vertical position & size of the screen image. LANGUAGE Select language for OSD (6 languages). CONTRAST Adjust the contrast of image, the difference between light and dark areas on the screen.
OPERATION AND ADJUSTMENT Self Diagnosis If there is no image, the Self Diagnosis screen will be displayed. Self Diagnosis function checks if the status of the monitor screen is No Signal, Out of range or None support. “No Signal” screen is displayed when the D-Sub signal connector is not connected or the status of the monitor is on DPMS mode. “Out of Range” screen is displayed when the applied frequency is under or over normal range.
ALIGNMENT PROCEDURE Standard Check point 1. Power source : 100 - 240Vac, 50/60Hz. 2. Aging : Take at least 20 minutes warm-up time. 3. Signal • Video input : Analog 0.7Vpp 75Ω terminal positive polarity • Synchronizing : acceptable negative or positive at TTL level • Max. Resolution : 15”-1024 x 768@75Hz • Frequency: 15”- Horizontal : 30KHz - 62KHz Vertical : 50Hz - 75Hz (available only non interlace mode) Adjustment 1. Sharpness set to 0% 2. Contrast set to 100% 3. Brightness set to 100% 4.
TROUBLESHOOTING HINTS 1. Abnormal mode detect 1-1. Abnormal mode detect for PC Source Abnormal mode detect Yes Is a input H-sync of Scaler(pin 126, U6) correct? No Yes Trouble in Scaler(U6). 17 Trouble in the H-sync input circuit.
TROUBLESHOOTING HINTS 2. Trouble in Power on Trouble in Power on Yes Is the Power LED toggled between on and off? On Refer to No video or No raster. Off Is the power cord well connected? No Check if the power switch is on position and Connect the power cord correctly. Yes Check the waveform of pin 17 of -com(U4). No Trouble in Scaler(U6). Yes Is Vcc 5V line normal(pin 8 of CON1)? No Yes Check on Scaler(U6). 18 Check the power board (Vcc 5V of CN2A).
TROUBLESHOOTING HINTS 3. No Raster No Raster Yes Check the output of Q1 or pin 15 of U4. low Trouble in pin 15 of -com. No Check the output of D811 12V line (power board). high Is 12V plugged in pin5 of CN2(power board)? Yes Is the output of inverter correct? No Replace the inverter. Yes Replace a LCD panal.
TROUBLESHOOTING HINTS 4. One color is missing One color is missing Yes Is the OSD color normal? No Check the output signal of Scaler. Yes Is the input signal normal? No Check the video signal cable or R,G,B con-ass’y. Yes Are the R,G,B Digital values (every eight bits) correct on Scaler output stage? No Yes Trouble in the soldering of R,G,B data lines from output of Scaler to Scaler(U6). 20 Check the ambient circuit of Scaler.
TROUBLESHOOTING HINTS 5. No Video No Video Yes Has display image only white? No Next page. Yes Check if the CON3 wafer is well connected at the LCD panel. No Connection trouble. Yes Is pin 1 of U2 3.3V? No Check U2, its ambient circuit and pin 14 of U8. Yes Check the output of scalier (pin LAV 0P~3P, 0M~3M) and soldering of CON3.
TROUBLESHOOTING HINTS 5-1. No Video Black Yes Is OSD normal? No 3. No raster Yes Is the contrast at its maximum? No Set the contrast up to Max. Yes Is the output of Scaler correct? No Is the input of Scaler correct? No Yes Yes Replace the main board (or replace Scaler). Check If the CON3 wafer is well connected at the LCD panel.
TROUBLESHOOTING HINTS 6. Power Problem Power problem Yes Is the power cord well connected? Check if the power cord is correctly connected. No Yes Check 5V, 3.3V, 12V of CN4. Yes Check the main board.
TROUBLESHOOTING HINTS 7. Sound Problem No Sound Is Audio-in OK? (pin 10, 14 at U7) No Check Audio-in jack(J1). Yes Is VCC(Pin15,16) of Audio IC(U7) 12V? No Check VCC 12V line. Yes Is Audio-out OK? No Yes Is Mute ON? No Check speaker. Yes Change Mute OFF. 24 Check Auido IC(U7).
BLOCK DIAGRAM 25
SCHEMATIC DIAGRAM(L523BM) 26
SCHEMATIC DIAGRAM 27
SCHEMATIC DIAGRAM 28
SCHEMATIC DIAGRAM 29
SCHEMATIC DIAGRAM 30
SCHEMATIC DIAGRAM 31
SCHEMATIC DIAGRAM 32
SCHEMATIC DIAGRAM 33
PCB PATTERN 34
PCB PATTERN 35
PCB PATTERN 36
PCB PATTERN 37
INFORMATION OF PART DESCRIPTION Important Safety Notice Components identified with the International Symbol have special characteristics important for safety. When replacing any components, use only manufacturer’s specified parts. Abbreviation of Description RESISTOR Description Tolerance F ± 1% J ± 5% K ± 10% M ± 20% G ± 2% Example: Fig & Index Part No Description Resistors RD-4Z820J Carbon : 82J HRFS472JBA Chip 4.7K OHM J R101 R30 CAPACITOR Description C D F J K P Z Tolerance ± 0.25pF ± 0.
ELECTRICAL PARTS LIST The components identified by mark have special characteristics important for safety and x-ray radiation. These should be replaced only with the types specified in the parts list.
ELECTRICAL PARTS LIST LOC C1 C10 C11 C12 C13 C14 C15 C16 C17 C18 C19 C20 C21 C22 C23 C24 C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C5 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C6 C60 C61 PART-CODE HCFK104ZBA HCEEF101MD HCFK104ZBA HCBK103KBA HCEEF101MD HCFK104ZBA HCFD105ZBA HCEEF101MD HCFK104ZBA HCBK103KBA HCFK104ZBA HCEEF101MD HCFK104ZBA HCEEF101MD HCFK104ZBA HCFK104ZBA HCFK104ZBA HCEEF101MD HCEEF101MD HCFK104ZBA HCFK104ZBA HCEKF100MC HCEDC470MC HCFK
ELECTRICAL PARTS LIST LOC C62 C63 C64 C65 C66 C67 C68 C69 C7 C70 C71 C72 C73 C74 C75 C76 C77 C78 C79 C8 C80 C81 C82 C83 C84 C85 C86 C87 C88 C89 C9 C90 C91 C92 CON3 D1 D10 D2 D3 D4 D5 D6 D7 D8 D9 FB1 FB2 L1 L10 L11 L12 L13 L2 L3 L4 PART-CODE HCEKF100MC HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCEKF100MC HCFK104ZBA HCBK103KBA HCFK104ZBA HCQK220JBA HCQK220JBA HCFD105ZBA HCEPF471ME HCEPF471ME HCFD105ZBA HCFK104ZBA HCEPF471ME HCEPF221ME HCFK104ZBA HCFK104ZBA HCFD105ZBA HCFD105ZBA HCFD105ZBA HCBK1
ELECTRICAL PARTS LIST LOC L5 L6 L7 L8 L9 PCB Q1 R1 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R2 R20 R21 R22 R23 R24 R25 R26 R27 R28 R29 R3 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R45 R46 R47 R48 R49 R5 R50 R51 R52 R53 R54 PART-CODE HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 9979800612 TKTC3875SY HRFS102JBA HRFS472JBA HRFS472JBA HRFS101JBA HRFS105JBA HRFS472JBA HRFS472JBA HRFS103JBA HRFS472JBA HRFS472JBA HRFS473JBA HRFS102JBA HRFS101JBA HRFS101JBA HRFS472JBA HRFS101JBA HRFS151JBA
ELECTRICAL PARTS LIST LOC R55 R56 R57 R58 R59 R6 R60 R61 R62 R64 R65 R66 R67 R68 R69 R7 R70 R8 R9 U2 U3 U4S U5 U6 Y1 Y2 Z2030 CA201 LED1 W5 W6 Z3030 Q201 Q202 SW201 SW202 SW203 SW204 SW205 SW206 Z4030 PCB R201 R202 R203 R204 R205 R206 R207 R208 R209 R212 Z1020 YR010 YR040 PART-CODE HRFS750JBA HRFS750JBA HRFS750JBA HRFS101JBA HRFS101JBA HRFS472JBA HRFS101JBA HRFS000JBA HRFS000JBA HRFS000JBA HRFS101JBA HRFS103JBA HRFS101JBA HRFS101JBA HRFS101JBA HRFS472JBA HRFS391JBA HRFS103JBA HRFS472JBA TAPM4835KC 1APL111
ELECTRICAL PARTS LIST LOC YR070 YR080 YR090 Z1030 YP010 YP020 YP030 YP040 YP050 YP051 YP060 YP061 YP063 YP064 YP065 YP100 YP110 YP120 YP130 PART-CODE 99729250A1 7173301012 7S103B4081 PCPKCPG205 9978051702 9978136300 9978215300 2TP00075CL 9975841000 9919310000 9978634606 W3415M7319970800072 9978212900 99708A0019 9975842900 9972610300 9975432903 9975841607 PART-NAME PART-DESC STAND AS SCREW TAPTITE SCREW SPECIAL PACKING AS BOX CARTON CUSHION BAG POLY TAPE OPP LABEL BARCODE LABEL BARCODE E MANUAL INSTRUCT
