Service Manual XGA COLOR MONITOR Model : 719B-3/719BF-3 DAEWOO LUCOMS CO., LTD. b http://www.lucoms.
CONTENTS SAFETY PRECAUTIONS 1 GENERAL SAFETY INFORMATION 2 SERVICING PRECAUTIONS 3 TECHNICAL INFORMATION 6 GENERAL INFORMATION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REPAIR 8 OPERATION AND ADJUSTMENT 9 ALIGNMENT PROCEDURE 15 TROUBLESHOOTING HINTS 17 BLOCK DIAGRAM 32 SCHEMATIC DIAGRAM 33 EXPLODED VIEW & MECHANICAL PARTS LIST 34 INFORMATION OF PART DESCRIPTION 36 ELECTRICAL PARTS LIST 37
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 this analog color display because of the high voltages used in the deflection circuits. These voltages are exposed in such areas as the associated flyback and yoke circuits.
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 ◆ Power IC, Transistor or Devices Removal/Replacement 1. Heat and remove all solders from the device leads. 2. Remove the heatsink mounting screw (if applicable). 3. Carefully remove the device from the circuit board. 4. Insert new device in circuit board. 5. Solder each device lead and then clip off excess lead. 6. Replace heatsink. ◆ Diode Removal/Replacement 1. Remove defective diode by clipping its leads as close as possible to diode body. 2.
GENERAL INFORMATION This color monitor automatically scans all horizontal frequencies from 30KHz to 70KHz, and all vertical frequencies from 50Hz to 160Hz. This color 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, 8514/A, Super VGA, VESA and XGA and Apple Macintosh Video Card).
PIN CONNECTOR Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Signal 1 Red Green Blue GND GND GND - Red GND - Green GND - Blue +5Vdc(option) GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) 6 10 15 Arrangement of 15-pin D-sub connector CAUTIONS FOR ADJUSTMENT AND REPAIR • Degaussing is always required when adjusting purity or convergence. • The white balance adjustment has been done by a color analyzer in factroy.
OPERATION AND ADJUSTMENT 719B-3 Control Panel POWER LIGHT • Move cursor to the right window on the OSD window. • Increase the value of any selected function. • While the OSD screen is off, you can adjust the screen brightness according to each situation. • • Move cursor to the left window on the OSD window. Decrease the value of any selected function. • Launch OSD(On-Screen Display) MENU window. • • Move cursor to the high window on the OSD window. Increase the value of V.size or V.center.
OPERATION AND ADJUSTMENT 719BF-3 Control Panel • • Move cursor to the right window on the OSD window. Increase the value of any selected function. • While the OSD screen is off, you can adjust the screen brightness according to each situation. • • Move cursor to the left window on the OSD window. Decrease the value of any selected function. • Launch OSD(On-Screen Display) MENU window. • • Move cursor to the high window on the OSD window. Increase the value of V.size or V.center.
OPERATION AND ADJUSTMENT 719B Key Process MENU MENU MENU MENU OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key BRIGHTNESS POWER LIGHT PC GAME MOVIE CONTRAST O The screen brightens progressively by 10%. If you carry out general PC works such as document edition on the Movie mode,you may shorten the life span of CRT. Thus,it is recommended to verify the selected mode before use.
OPERATION AND ADJUSTMENT 719BF Key Process OSD OFF • When you choose the icon on the OSD window, you can exit the OSD screen. Hot Key POWER LIGHT BRIGHTNESS PC GAME MOVIE CONTRAST The screen brightens progressively by 10%. If you carry out general PC works such as document edition on the Movie mode,you may shorten the life span of CRT. Thus,it is recommended to verify the selected mode before use.
OPERATION AND ADJUSTMENT OSD Functions ICON CONTROL FUNCTIONS PINCUSHION Adjust the left and right margins for more convex or more concave margins. TRAPEZOID Adjust the trapezoid of the screen by moving the lines inward or outward. PARALLELOGRAM Adjust the parallelogram when the screen is leaning left or right. PIN BALANCE Adjust the side balance when the sides of the screen are bowed towards left or right. T. PIN CORNER Adjust the pin corner top when the top sides of the screen are bowed. B.
OPERATION AND ADJUSTMENT ICON CONTROL FUNCTIONS STATUS Display horizontal & vertical frequency and polarity. H. MOIRE Adjust the horizontal picture moire cancellation. V. MOIRE Adjust the vertical picture moire cancellation. LANGUAGE Select language for OSD (5 languages). RECALL Reset the screen to the Factory Preset Display Settings.
ALIGNMENT PROCEDURE ◆ Standard Adjustment Conditions 1. Power source voltage : AC 100~240V, 50/60Hz 2. Aging : Take at least 20 minutes warm-up time. 3. Signals. Video : Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : TTL Level Negative/Positive Separate/Composite Deflection frequency Horizontal Frequency : 30KHz - 70KHz Vertical Frequency : 50Hz - 160Hz ◆ Pre-Adjustment 1.
ALIGNMENT PROCEDURE (g) Receive the small square white pattern about 50 x 50mm. (h) Adjust the G-gain control to get the brightness to 50 Ft/L. (i) Adjust the B-gain control to get the y cordinate to 0.311 ± 0.03. (j) Adjust the R-gain control to get the x cordinate to 0.281 ± 0.03. (k) Receive the full white pattern. (l) Adjust the ABL control to get the brightness to 32 Ft/L. 6. Static Convergence Adjustment (a) Apply a magenta cross hatch pattern on display.
TROUBLESHOOTING HINTS 1. No Character No Character Are the Contrast & Brightness Controls maximum No Change the Contrast & Brightness control to maximum Yes Is whole screen bright? No No Raster Refer to No Raster Yes Is CRT Cathode (Rk, Gk, Bk) signal level normal? No Is the output signal of the (pin 19,20,21) pre-amp (IC201) normal? Yes Check the peripheral circuit of CRT Board Rk, Gk, Bk About 40Vpp Yes Check the video output (IC203) and their ambient circuit No Trouble in 6.
TROUBLESHOOTING HINTS 2. No Raster No Raster Is CRT heater red-hot? Is Heater Voltage (CRT PWB) about 6V? No Yes Yes Trouble in CRT No Trouble in power supply circuit Turn the Brightness & Contrast control to set Maximum Refer to trouble in power supply unit.
TROUBLESHOOTING HINTS 3. A Missing Color One color is missing Is input signal normal? No Check video signal cable or video card. No Trouble in IC201 or its ambient circuit 0.
TROUBLESHOOTING HINTS 4. Horizontal Output Circuit Trouble in Horizontal output circuit (No Raster Is the B+line voltage over 54V? No Trouble in B+ Booster Circuit (Check the B+section of IC501) Yes Is the H-out waveform of IC501 normal? 11V 0V No Trouble in IC501 Yes Is the Collector waveform of Q406 normal? 66V Yes Trouble in Q406 and its ambient circuit. 20 No Trouble in Q406 and its ambient circuit.
TROUBLESHOOTING HINTS 5. Unstable Picture 5-1. Horizontal Unstable picture Is H.Sync input pin of IC501 correct? No Check H.Sync Out of Micom or its ambient circuits. No Check the value of C402, R423. Yes Is the pin 29 of IC501 12~13V? Yes Trouble in IC501.
TROUBLESHOOTING HINTS 5-2. Vertical Unstable or Abnormal picture Is 13V DC line correct? No Check PWR 13V ambient circuit. Yes Check V.DY and ambient circuit. Yes Check the IC301 or ambient circuit. Yes 45Vp-p Is the output waveform of IC301 (pin 5) normal? No Is the output pulse of IC501 (pin 13) normal? No Trouble in V.Sync line or IC501 failure.
TROUBLESHOOTING HINTS 6.
TROUBLESHOOTING HINTS 6-1. Dynamic Focus FVH FVV * Check after adjusting the static focus finely by VR in FBT Focus is poor ORION : 300V 120V SAMSUNG : 300V 120V DF waveform FVH FVV Is the waveform of the DF pin in FBT correct? Yes 1. Check the CRT socket or connector wire. 2. Trouble in FBT or CRT. No Is the waveform of the pin 32 in IC501 correct? Yes Trouble in Q901,T902,R903 24 No Trouble in IC501 or C407.
TROUBLESHOOTING HINTS 7. Convergence Poor convergence Is convergence on the center area bad? Yes Adjust static convergence Refer to Adjustment procedure of convergence No Is convergence on the fringe area bad? Yes Adjust D.
TROUBLESHOOTING HINTS 8. Abnormal Picture 8-1. Horizontal Size Abnormal H.Size When the H.Size on the OSD is changed, is the H.size changed? No Yes It isn’t out of order.
TROUBLESHOOTING HINTS 8-2. Vertical Size Abnormal V.Size Is changeable the DC voltage of IC301 pin 5? No Is the 3.5Vdc of pin 23 of the IC501? No Yes Trouble V.OSC/ Deflection Circuit Check the pin 23 of IC501 and its ambient circuit Refer to V.
TROUBLESHOOTING HINTS 9. High Voltage Output Circuit Trouble in H.V circuit (No Raster) Is B+(54V) line voltage normal? No Trouble in power supply circuit. Yes Trouble in FBT. Yes Trouble in IC501 ambient circuit. Yes Trouble in IC501 ambient circuit. Yes Is Q407 collector waveform normal? No Is IC501 pin 26 normal? No Is the IC501 pin 1 H.trigger correct? No Trouble in H.trigger.
TROUBLESHOOTING HINTS 10. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel Select the side-pincushion icon on OSD menu, and adjust acceptable position. Yes O.K No Is the pin 11 waveform of IC501 correct? Yes Check IC501or their ambient circuit Yes Check IC501 or it’s ambient circuit. No Is the waveform of IC501 pin 14,15? No Trouble in H.
TROUBLESHOOTING HINTS 11. Power Supply Unit (P.S.U) Trouble in P.S.U Is power switch on? No Switch on Yes Is fuse F001 O.K? No Check the power cord outlet and diode D001, D002, D003, D004, Q001 No Trouble in D001, D002, D003, D004, C004 and TH001. Yes Is voltage of T001 pin 8 130V (370V)? Yes Is the waveform of Q001 Drain pin correct? 400Vpp (620Vpp) No Trouble in T001, IC001, Q001 and D009 etc.
TROUBLESHOOTING HINTS A Is voltage of C827 13Vdc? No Trouble in D814 or horizontal part No Trouble in D908 or FBT part. Yes Is voltage of C908 -12Vdc? Yes P.S.U O.
BLOCK DIAGRAM 719B-3/719BF-3 32
SCHEMATIC DIAGRAM 719B-3/719BF-3 33
EXPLODED VIEW & MECHANICAL PARTS LIST 719B-3 719B 34
EXPLODED VIEW & MECHANICAL PARTS LIST 719BF-3 719B 35
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 Allowance F ± 1% J ± 5% K ± 10% M ± 20% G ± 2% Example: Fig & Index Part No Description Resistors RD-4Z820J Carbon: 82J RD-4Z201J Carbon1/4W-200J R101 R102 CAPACITOR Description C D F J K P Z Allowance ± 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 PART-CODE PART-NAME C407 CMXM2A104J C MYLAR C408 CMXM2A472J C MYLAR C409 CMXD2A821J C410 C411 PART-DESC LOC PART-CODE PART-NAME PART-DESC 100V 0.1MF J (TP) C913 CMXM2A102J C MYLAR 100V 1000PF J (TP) 100V 4700PF J (TP) C915 CEXF1C471V C ELECTRO 16V RSS 470MF (8X12)TP C MYLAR KD 100V 820PF J C916 CEXF1C470V C ELECTRO 16V RSS 47MF (5X11) TP CMXM2A103J C MYLAR 100V 0.01MF J (TP) C917 CCXF1H104Z C CERA 50V F 0.
ELECTRICAL PARTS LIST LOC PART-CODE PART-NAME ! D814 DUG2D——- DIODE D816 85801065GY WIRE COPPER D901 DUG1D——- DIODE D903 D1N4937GP- D904 D1N4937GP- D905 PART-DESC LOC PART-CODE PART-NAME PART-DESC UG2D 200V 2A J021 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING AWG22 1/0.65 TIN COATING J022 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING UG1D J023 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING DIODE 1N4937GP (TAPPING) J024 85801065GY WIRE COPPER AWG22 1/0.
ELECTRICAL PARTS LIST LOC PART-CODE PART-NAME J205 85801065GY WIRE COPPER J206 85801065GY WIRE COPPER J207 85801065GY J208 J209 PART-DESC LOC PART-CODE PART-NAME PART-DESC AWG22 1/0.65 TIN COATING Q418 TKTD2061— TR AWG22 1/0.65 TIN COATING Q801 TZTC3198Y- TRANSISTOR KTC3198Y-(1815Y) (AUTO) WIRE COPPER AWG22 1/0.65 TIN COATING Q803 TKSD1616Y- TR KSD1616Y 85801065GY WIRE COPPER AWG22 1/0.65 TIN COATING Q805 TKSB1116Y- TR KSB1116Y 85801065GY WIRE COPPER AWG22 1/0.
ELECTRICAL PARTS LIST LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC R161 RD-AZ122J- R CARBON FILM 1/6 1.2K OHM J R408 RD-AZ103J- R CARBON FILM 1/6 10K OHM J R162 RD-AZ272J- R CARBON FILM 1/6 2.7K OHM J R409 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R163 RD-AZ512J- R CARBON FILM 1/6 5.1K OHM J R410 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R164 RD-AZ822J- R CARBON FILM 1/6 8.2K OHM J R411 RN-AZ6401F R METAL FILM 1/6 6.
ELECTRICAL PARTS LIST LOC PART-CODE PART-NAME PART-DESC LOC ! R515 ! R516 RN-AZ1003F R METAL FILM 1/6 100K OHM F R929 RD-AZ103J- R CARBON FILM 1/6 10K OHM J RD-AZ334J- R CARBON FILM 1/6 330K OHM J R930 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R518 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R936 RD-AZ333J- R CARBON FILM 1/6 33K OHM J ! R552 RN-AZ1203F R METAL FILM 1/6 120.0K OHM F R937 RD-AZ432J- R CARBON FILM 1/6 4.3K OHM J R801 RD-AZ472J- R CARBON FILM 1/6 4.
ELECTRICAL PARTS LIST ◆ Difference Components List Between 719B-3 and 719BF-3 719B-3 719BF-3 LOC. Part No. Part Description Part No. Part Description CDT 9979617041 M41KXU200XX021 9979617081 M41QEC200XX021 R468 RD-AZ302J 1/6W 3K ohm RD-AZ222J- 1/6W 2.
