Service Manual LCD COLOR MONITOR Model : CML-710 DAEWOO LUCOMS CO., LTD. http://www.lucoms.
CONTENTS SAFETY PRECAUTIONS 2 GENERAL SAFETY INFORMATION 3 SERVICING PRECAUTIONS 4 TECHNICAL INFORMATION 8 GENERAL INFORMATION 9 PIN CONNECTOR 9 CAUTIONS FOR ADJUSTMENT AND REPAIR 9 OPERATION & ADJUSTMENT 10 ALIGNMENT PROCEDURE 16 TROUBLESHOOTING HINTS 17 BLOCK DIAGRAM 24 SCHEMATIC DIAGRAM 25 PCB PATTERN 30 INFORMATION OF PART DESCRIPTION 34 ELECTRICAL PARTS LIST 35 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 Optimal Resolution Colors Display Area PC Input Signal Plug and Play Power Source Power Consumption Dimension-W x H x D (without speaker) Weight-net/gross Power Saving Tilt Range Operating Temperature Size 17-inch (43.2 cm) diagonal Pixel Pitch 0.264 x 0.
GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 80KHz, and all vertical frequencies from 56Hz to 77Hz(15”- 50KHz to 75KHz). 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 << L710 >> 2 POWER Indicator 1 POWER Shows both normal operation and power management status with power indicator light. Swithes the monitor on and off. 5 8 3 7 6 4 3 1 (*) 2 4 Moves cursor to the right or low window in the OSD window and increases the value of any selected function. 5 POWER LIGHT Moves cursor to the left or high window in the OSD window and decreases value of any selected function.
OPERATION AND ADJUSTMENT Key Process MENU 1280X1024 80K UT L TY 75 UT L TY OSD OSD SELECT UT L TY EXIT SELECT SHARPNESS EXIT 11 EXIT SHARPNESS
OPERATION AND ADJUSTMENT HOT KEY AUTO AUTO T R AC K I N G BRIGHTNESS / When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode. When there is no OSD, if you press this BRIGHTNESS button, you can adjust the brightness directly. : decreases brightness : increases brightness POWER LIGHT POWER LIGHT PC 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 ICON CONTROL FUNCTIONS LANGUAGE Select language for OSD (6 languages). 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 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 : 17”-1280 x 1024@75Hz, • Frequency: 17”- Horizontal : 30KHz - 80KHz Vertical : 56Hz - 77Hz (available only non interlace mode) Adjustment 1. Sharpness set to 0% 2. Contrast set to 100% 3. Brightness set to 100% 4.
TROUBLESHOOTING HINTS (L710) 1. Abnormal mode detect Abnormal mode detect Yes Is a input H-sync of Scaler(pin126, U6) correct? No Trouble in the H-sync input circuit. Yes Trouble in Scaler(U6).
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 VCC5V line normal(pin 8 of CON1)? No Yes Check on Scaler(U6). 18 Check the power board (VCC5V of CON2).
TROUBLESHOOTING HINTS 3. No Raster No Raster Yes Check the output of Q1 or pin 15 of U14. low Trouble in Q1 or pin 15 of -com. high Is 12V plugged in pin 5 of CN2(power board)? No Check the output of 12V line(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 Check the ambient circuit of Scaler. Yes Trouble in the soldering of R,G,B data lines from output of Scaler to Scaler(U6).
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 5, 6, 7, 8 of U2 5V? No Yes Check interface scalier pin LAV (0P~3P, 0M~3M) and solding of CON3. 21 Check U2, its ambient circuit and pin 14 of U8.
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? No Yes Check +3.3V, +5V, +12V of CN2. Yes Check the main board. 23 Check if the power cord is correctly connected.
BLOCK DIAGRAM 24
SCHEMATIC DIAGRAM(L710) 25
SCHEMATIC DIAGRAM 26
SCHEMATIC DIAGRAM 27
SCHEMATIC DIAGRAM 28
SCHEMATIC DIAGRAM 29
PCB PATTERN 30
PCB PATTERN 31
PCB PATTERN 32
PCB PATTERN 33
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 (L710) 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 C40 C41 C42 C43 C45 C46 C47 C48 C49 C50 C51 C53 C54 C55 C56 C58 C59 C6 C60 C61 C63 C64 C65 C66 C67 C69 C7 C70 C71 C72 C8 C81 C82 C83 C84 C85 C86 C87 C88 C89 C90 C91 C92 CON3 D1 D10 D4 D5 D6 L1 L10 L11 L12 L13 L14 PART-CODE HCQK101JBA HCQK471JBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104ZBA HCFK104Z
ELECTRICAL PARTS LIST LOC L2 L3 L4 L5 L6 L7 L8 L9 Q1 R1 R10 R11 R12 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 R49 R5 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 PART-CODE HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 HFFHH1M601 TKTC3875SY HRFS102JBA HRFS472JBA HRFS472JBA HRFS101JBA HRFS472JBA HRFS472JBA HRFS103JBA HRFS472JBA HRFS472JBA HRFS473JBA HRFS102JBA HRFS101JBA HRFS101JBA HRFS472JBA HRFS101JBA HRF
ELECTRICAL PARTS LIST LOC R6 R60 R61 R62 R64 R65 R66 R67 R68 R69 R7 R70 R74 R8 R9 U2 U3 U4S U5 U6 Z4010 Z5010 C10 C13 C16 C2 C20 C22 C26 C27 C30 C31 C33 C36 C44 C5 C52 C57 C62 C68 C9 Z6010 DZ1 DZ2 DZ3 DZ4 DZ5 PCB Z2020 CN901 LED1 Z3030 SW901 SW902 SW903 PART-CODE HRFS472JBA HRFS101JBA HRFS000JBA HRFS000JBA HRFS000JBA HRFS101JBA HRFS103JBA HRFS101JBA HRFS101JBA HRFS101JBA HRFS472JBA HRFS391JBA HRFS472JBA HRFS103JBA HRFS472JBA TFDS4435A1B1117N259979300502 1CAT24WC08 1MST9111— PCMPJ0J266 PCMPJRJ266 CEXF1C101
ELECTRICAL PARTS LIST LOC SW904 SW905 SW906 SW907 Z4030 PCB R207 R209 R901 R902 R903 R904 R905 R906 R907 Z1020 YR010 00010 YR020 YR030 YR040 YR050 YR060 Z1030 YST10 00010 00010 00020 00030 00040 YST20 YST30 00010 YST40 YST50 00010 Z1040 TP061 TP062 TP063 YP001 YP010 YP020 YP030 YP040 YP050 YP060 YP120 YP130 PART-CODE 5S50101Z10 5S50101Z10 5S50101Z10 5S50101Z10 PCPLJAJ267 9979800630 RD-AZ101JRD-AZ101JRD-AZ303JRD-AZ153JRD-AZ302JRD-AZ471JRD-AZ302JRD-AZ153JRD-AZ471JPCBCCPJ267 9972117600 22211102H5 99779234A0
