Related Manuals for Daewoo L520B
Summary of Contents for Daewoo L520B
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Page 1: Service Manual
Service Manual XGA COLOR MONITOR Model : L520B/L520BM L521B/L521BM L520BAV DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.kr October, 2002... -
Page 2: Table Of Contents
PIN CONNECTOR CAUTIONS FOR ADJUSTMENT AND REPAIR OPERATION & ADJUSTMENT ALIGNMENT PROCEDURE TROUBLESHOOTING HINTS (L520B/L520BM/L521B/L521BM) TROUBLESHOOTING HINTS (L520BAV) BLOCK DIAGRAM SCHEMATIC DIAGRAM EXPLODED VIEW & MECHANICAL PARTS LIST INFORMATION OF PART DESCRIPTION ELECTRICAL PARTS LIST (L520B/L520BM/L521B/L521BM) ELECTRICAL PARTS LIST (L520BAV) -
Page 3: Safety Precautions
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. -
Page 4: General Safety Information
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... -
Page 5: Servicing Precautions
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. - Page 6 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.
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Page 7: Small-Signal" Discrete Transistor Removal/Replacement
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. -
Page 8: Technical Information
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. -
Page 9: General Information
GENERAL INFORMATION This TFT LCD monitor automatically scans all horizontal frequencies from 30KHz to 62KHz, and all vertical frequencies from 50Hz to 75Hz. 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 and XGA and Apple Macintosh Video Card). -
Page 10: Pin Connector
PIN CONNECTOR Signal Green Blue GND - Red GND - Green GND - Blue 5Vdc Arrangement of 15-pin D-sub connector GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) CAUTIONS FOR ADJUSTMENT AND REPAIR •... -
Page 11: Operation & Adjustment
OPERATION AND ADJUSTMENT << L520B/L520BM >> Control Panel POWER POWER Indicator swithes the monitor on and off. shows both normal operation and power management status with power indicator light. moves cursor to the right or low moves cursor to the left or high window... -
Page 12: Hot Key
Key Process MENU U T L TY 1024X768 U T L TY MENU MENU EXIT EXIT UT L TY SH ARPN ESS SH AR PN ESS EXIT OSD OFF HOT KEY AUTO TRACK ING When there is no OSD, if you press this AUTO button, you can use the best display performance fit for a current mode. -
Page 13: Control Panel
<< L521B/L521BM >> Control Panel POWER POWER Indicator swithes the monitor on and off. shows both normal operation and power management status with power indicator light. AUTO EXIT MENU BRIGHTNESS moves cursor to the right or low moves cursor to the left or high window window in the OSD window and in the OSD window and decreases increases the value of any selected... - Page 14 Key Process MENU U T L TY 1024X768 U T L T Y MENU MENU EXIT EXIT SH AR PN ESS U T L TY SH A R PN ESS EXIT OSD OFF HOT KEY AUTO When there is no OSD, if you press this AUTO button, you can AUTO T RACK ING use the best display performance fit for a current mode.
- Page 15 << L520BAV >> Control Panel POWER POWER Indicator swithes the monitor on and off. shows both normal operation and power management status with power indicator light. moves cursor to the right or low window moves cursor to the left or high window in the OSD window and increases the in the OSD window and decreases value value of any selected function.
- Page 16 Key Process MENU U T L T Y U T L T Y 1024X768 MENU MENU EXIT EXIT U T L T Y S H A R P N ES S S H AR P N E SS EXIT OSD OFF HOT KEY AUTO When there is no OSD, if you press this AUTO button, you can...
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Page 17: Adjustment Procedure
Adjustment Procedure Is the H.Size Adjust the CLOCK proper? control. Perform the AUTO Is the POSITION noise displayed on the screen? Perform the AUTO TRACKING Is the noise displayed on the screen yet? Adjust the CLOCK FINE until the screen is cleared. - Page 18 OSD Functions (L520B/L520BM/L521B/L521BM) ICON CONTROL FUNCTIONS Select language for OSD (6 languages). LANGUAGE CLOCK Adjust the width (horizontal size) of the screen image. Sharpen the focus by aligning the illuminated pixels and adjust until the screen image looks focused, crisp and sharp. Adjusting the...
- Page 19 OSD Functions (L520BAV) << OSD FUNCTIONS WITH USING PC >> INPUT Select PC mode. Select S-VIDEO mode. SVIDEO Select Video(CVBS) mode. VIDEO SOUND Adjust sound. VOLUME Increase or decrease audio volume. Balance audio sound. BALANCE Adjust high frequency response. TREBLE BASS Adjust low frequency response.
- Page 20 Adjust the blue color. BLUE CONTROL COLOR Choose different preset color temperatures or set your own customized color parameters. TEMPERATURE CENTER H. CENTER & Adjust the position of the display horizontally (left or right) and vertically (up or down) V. CENTER UTILITY Adjust the display image quality (if the screen proceed to scaling up).
- Page 21 << OSD FUNCTIONS WITH USING VIDEO >> Increase or decrease audio volume. VOLUME Adjust the brightness of image. BRIGHTNESS CONTRAST Adjust the contrast of image. COLOR SATURATION Adjust saturation of image. Adjust the hues of image. Adjust the display image quality (if the screen proceed to scaling up). SHARPNESS SOUND BALANCE...
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Page 22: Self Diagnosis
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”, “None support” or “Check Cable”. “No Signal” screen is displayed when the D-Sub signal connector is connected and the status of the monitor is on DPMS mode. -
Page 23: Alignment Procedure
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. -
Page 24: Troubleshooting Hints (L520B/L520Bm/L521B/L521Bm)
TROUBLESHOOTING HINTS (L520B/L520BM/L521B/L521BM) 1. Abnormal mode detect Abnormal mode detect Is a input Trouble in the H-sync H-sync of ADC(pin 90, input circuit. U12) correct? Is waveform Trouble of pin 81 of ADC(U12) in ADC. correct? Trouble in Scaler(U9). - Page 25 2. Trouble in Power on Trouble in Power on Is the Refer to No video Power LED toggled or No raster. between on and off? Check if the power switch Is the power is on position and cord well Connect the power connected? cord correctly.
- Page 26 3. No Raster No Raster Check the Trouble in pin 42 output of Q2 or -com. pin 42 of U6. < 2.5 > 2.5 Is 12V plugged in pin 1 Check the output of CN4A(power of D811(power board). board)? Is the output of Replace the inverter.
- Page 27 4. One color is missing One color is missing Check the output Is the OSD color signal of Scaler. normal? Is the input Check the video signal signal normal? cable or R,G,B con-ass’y. Are the R,G,B Digital values Check the ambient (every eight bits) correct circuit of ADC.
- Page 28 5. No Video No Video Has display image Next page. only white? Check if the CN5 wafer is Connection trouble. well connected at the LCD panel. Is pin 1 Check Q5, its ambient of Q5 3.3V? circuit and pin 42 of -com. Check the output of scalier (pin 71, 72, 73, 74, 75) and soldering of CN5.
- Page 29 5-1. No Video Black Is OSD normal? 3. No raster Set the contrast Is the contrast up to Max. at its maximum? Is the output of Is the input of ADC correct? ADC correct? Check the video Replace the main board Next Page.
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Page 30: Power Problem
6. Power Problem Power problem Is the power Check if the power cord well cord is correctly connected? connected. Check 5VS, 5VD, 5VA, 6V, 3.3V of CN2A. the output of D812 6.2V? Check the main board. Check ambient circuit of IC801. -
Page 31: Troubleshooting Hints (L520Bav)
TROUBLESHOOTING HINTS (L520BAV) 1. Abnormal mode detect 1-1. Abnormal mode detect for PC Source Abnormal mode detect Is a input Trouble in the H-sync H-sync of ADC(pin 90, input circuit. U12) correct? Is waveform Trouble of clock of ADC(pin 49, in ADC. - Page 32 1. Abnormal mode detect 1-2. Abnormal mode detect for AV Source Abnormal mode detect Is a input signal of Decoder (pin 10 at CVBS or Check J5. pin 14, 18 at S- Video of U5)? Is clock of Trouble in Decoder (pin 94, U5) decoder(U5).
- Page 33 2. Trouble in Power on Trouble in Power on Is the Refer to No video Power LED toggled or No raster. between on and off? Check if the power switch Is the power is on position and cord well Connect the power connected? cord correctly.
- Page 34 3. No Raster No Raster Check the Trouble in Q5 or output of Q4 or pin 41 of -com. pin 41 of U6. < 2.5 > 2.5 Is 12V plugged in pin 1 Check the output of CN4A(power of D811(power board). board)? Is the output of Replace the inverter.
- Page 35 4. One color is missing for PC Source One color is missing Check the output Is the OSD color signal of Scaler. normal? Is the input Check the video signal signal normal? cable or R,G,B con-ass’y. Are the R,G,B Digital values Check the ambient (every eight bits) correct circuit of ADC.
- Page 36 5. No Video...
- Page 37 5. No Video 5-1. No video for PC Source Black Is OSD normal? 3. No raster Set the contrast Is the contrast up to Max. at its maximum? Is the output of Is the input of ADC correct? ADC correct? Check the video Replace the main board Next Page.
- Page 38 5. No Video 5-2. No video for AV Source Black Is OSD normal? 3. No raster Set the contrast Is the contrast up to Max. at its maximum? Is the input of Is the output of Decoder(U5) Decoder(U5) correct? correct? Check the video Replace the main board Next Page.
- Page 39 6. Power Problem Power problem Is the power Check if the power cord well cord is correctly connected? connected. Check 5VS, 5VD, 5VA 3.3V of CN2A. the output of D812 6.2V on power board? Check the main board. Check ambient circuit of IC801 on power board.
- Page 40 7. Sound Problem No Sound Audio-in OK? Check Audio-in (pin 10, 14 at PC Source jack(CN 11). and pin 9, 13 at AV Source Is input of Is VDD(pin2) 9V regulator(IC 602) of Audio IC(IC 601) 12V? Change 9V Regulator (IC 602).
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Page 41: Block Diagram
BLOCK DIAGRAM... -
Page 42: Schematic Diagram
SCHEMATIC DIAGRAM TDA 8752 Section... - Page 43 DVI Receiver Section...
- Page 44 Video Decoder Section...
- Page 45 Micro Controller Section...
- Page 46 ASI 310 Section...
- Page 47 LCD Panel Interface Section...
- Page 48 Power Distribution Section...
- Page 49 Jack PCB Section...
- Page 50 Key and TV Tuner Section...
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Page 51: Exploded View & Mechanical Parts List
EXPLODED VIEW & MECHANICAL PARTS LIST... -
Page 52: Information Of Part Description
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 ± 1% ± 5% ± 10% ±... -
Page 53: Electrical Parts List (L520B/L520Bm/L521B/L521Bm)
ELECTRICAL PARTS LIST (L520B/L520BM/L521B/L521BM) 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. LEVEL PART-CODE PART-NAME PART-DESC NOTE 1 Z1010 PCFMCAG161(162) COVER FRONT AS... - Page 54 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 C130 HCEDC470MC C CHIP ELECTRO MV 6.3V 47MF 5DX5.2H 4 C131 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C132 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C133 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C134...
- Page 55 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 C216 HCEKF100MC C CHIP ELECTRO MV 16V 10MF D4.0XH5.2 4 C22 HCQK150JBA C CHIP CERA 50V CH 15PF J 1608 4 C23 HCBK223KBA C CHIP CERA 50V X7R 0.022MF K 1608 4 C24 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C25...
- Page 56 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 Q3 TKTC3875SY TR CHIP KTC3875SY(RTK) 4 Q4 TKTC3875SY TR CHIP KTC3875SY(RTK) 4 Q5 TFDS4435A- FDS4435A 4 R1 HRFS000JBA R CHIP 1/16 0 OHM J 1608 4 R10 HRFS750JBA R CHIP 1/16 75 OHM J 1608 4 R100 HRFS472JBA R CHIP...
- Page 57 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 R75 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 4 R76 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 4 R77 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 4 R82 HRFS101JBA R CHIP 1/16 100 OHM J 1608 4 R83 HRFS472JBA...
- Page 58 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 SW205 5S50101Z10 SW TACT KPT-1115AM 4 SW206 5S50101Z10 SW TACT KPT-1115AM 4 Z4040 PCPLJAG158 PCB CONTROL AXIAL AS CML-520BAV 5 PCB 9979800580 PCB CONTROL T=1.6*235*28 5 R201 RD-AZ302J- R CARBON FILM 1/6 3K OHM J 5 R202 RD-AZ682J- R CARBON FILM...
- Page 59 LEVEL PART-CODE PART-NAME PART-DESC NOTE 4 C838 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP 4 C845 CEXF1C102C C ELECTRO 16V RUS 1000MF (10X20) TP 4 C850 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP 4 C851 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP 4 C855 CEXF1C471C C ELECTRO...
- Page 60 LEVEL PART-CODE PART-NAME PART-DESC NOTE 6 R815 RW01Z758JN R WIRE WOUND 1W 0.75 OHM J NON-INDUCT 6 R820 RD-AZ180J- R CARBON FILM 1/6 18 OHM J 6 R822 RD-AZ681J- R CARBON FILM 1/6 680 OHM J 6 R825 RD-AZ479J- R CARBON FILM 1/6 4.7 OHM J 6 R826 RD-AZ333J-...
- Page 61 LEVEL PART-CODE PART-NAME PART-DESC NOTE 2 YR070 99729250A1 STAND AS CML-520B STAND AS 2 YR080 7173301012 SCREW TAPTITE TT2 BIN 3X10 MFZN BK 2 YR090 7S103B4081 SCREW SPECIAL M/C BIN 4*8 MFZN 1 Z1030 PCPKCPG161(162) PACKING AS CML-520B(L520BM) 2 YP010 9978047300 BOX CARTON DW-3 (DW) 2 YP020 9978136300...
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Page 62: Electrical Parts List (L520Bav)
ELECTRICAL PARTS LIST (L520BAV) 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. LEVEL PART-CODE PART-NAME PART-DESC 1 Z1010 PCFMCAG158 COVER FRONT AS CML-520BAV 2 LCD 9979615042... - Page 63 LEVEL PART-CODE PART-NAME PART-DESC 4 C13 HCEEF101MD C CHIP ELECTRO MV 16V 100MF M 6.3DX5.7H 4 C130 HCEDC470MC C CHIP ELECTRO MV 6.3V 47MF 5DX5.2H 4 C131 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C132 HCFK104ZBA C CHIP CERA 50V Y5V 0.1MF Z 1608 4 C133 HCFK104ZBA...
- Page 64 LEVEL PART-CODE PART-NAME PART-DESC 4 C21 HCQK150JBA C CHIP CERA 50V CH 15PF J 1608 4 C216 HCEKF100MC C CHIP ELECTRO MV 16V 10MF D4.0XH5.2 4 C22 HCQK150JBA C CHIP CERA 50V CH 15PF J 1608 4 C23 HCBK223KBA C CHIP CERA 50V X7R 0.022MF K 1608 4 C24 HCFK104ZBA...
- Page 65 LEVEL PART-CODE PART-NAME PART-DESC 4 C93 HCQK200JBA C CHIP CERA 50V CH 20PF J 1608 4 C94 HCFH473ZBA C CHIP CERA 25V Y5V 0.047MF Z 1608 4 C97 HCFH473ZBA C CHIP CERA 25V Y5V 0.047MF Z 1608 4 C98 HCFH473ZBA C CHIP CERA 25V Y5V 0.047MF Z 1608 4 C99...
- Page 66 LEVEL PART-CODE PART-NAME PART-DESC 4 R130 HRFS105JBA R CHIP 1/16 1M OHM J 1608 4 R131 HRFS102JBA R CHIP 1/16 1K OHM J 1608 4 R132 HRFS330JBA R CHIP 1/16 33 OHM J 1608 4 R133 HRFS102JBA R CHIP 1/16 1K OHM J 1608 4 R134 HRFS102JBA R CHIP...
- Page 67 LEVEL PART-CODE PART-NAME PART-DESC 4 R94 HRFS000JBA R CHIP 1/16 0 OHM J 1608 4 R96 HRFS000JBA R CHIP 1/16 0 OHM J 1608 4 R97 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 4 R98 HRFS472JBA R CHIP 1/16 4.7K OHM J 1608 4 RA10 HRTS8E330J R CHIP ARRAY...
- Page 68 LEVEL PART-CODE PART-NAME PART-DESC 5 R204 RD-AZ303J- R CARBON FILM 1/6 30K OHM J 5 R205 RD-AZ623J- R CARBON FILM 1/6 62K OHM J 5 R206 RD-AZ221J- R CARBON FILM 1/6 220 OHM J 5 R207 RD-AZ101J- R CARBON FILM 1/6 100 OHM J 5 R208 RD-AZ221J-...
- Page 69 LEVEL PART-CODE PART-NAME PART-DESC 4 C860 CEXF1E471C C ELECTRO 25V RUS 470MF (10X16) TP 4 IC801 1KA3842B-- IC POWER KA3842B 4 Z5010 PCSMJRG158 PCB POWER RADIAL AS CML-520BAV 5 C803 CEXF1C101V C ELECTRO 16V RSS 100MF (6.3X11) TP 5 C805 CEXF1H330V C ELECTRO 50V RSS 33MF (6.3X11) TP...
- Page 70 LEVEL PART-CODE PART-NAME PART-DESC 6 R827 RD-AZ151J- R CARBON FILM 1/6 150 OHM J 6 R832 RD-AZ102J- R CARBON FILM 1/6 1K OHM J 6 R837 RD-AZ102J- R CARBON FILM 1/6 1K OHM J 6 R839 RN-AZ1002F R METAL FILM 1/6 10K OHM F 6 R840 RN-AZ6491F...
- Page 71 LEVEL PART-CODE PART-NAME PART-DESC 5 D603 DZN4148--- DIODE 1N4148 AUTO 52MM 5 D604 DZN4148--- DIODE 1N4148 AUTO 52MM 5 D605 DZN4148--- DIODE 1N4148 AUTO 52MM 5 D606 DZN4148--- DIODE 1N4148 AUTO 52MM 5 D607 DZN4148--- DIODE 1N4148 AUTO 52MM 5 D608 DZN4148--- DIODE 1N4148 AUTO 52MM...