Service Manual XGA COLOR MONITOR Model : 103FH DAEWOO ELECTRONICS CO., LTD. http : //svc.dwe.co.
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 & ADJUSTMENT 9 ALIGNMENT PROCEDURE 14 TROUBLESHOOTING HINTS 16 BLOCK DIAGRAM 32 PCB LAYOUT 33 SCHEMATIC DIAGRAM 39 EXPLODED VIEW & MECHANICAL PARTS LIST 43 INFORMATION OF PART DESCRIPTION 44 ELECTRICAL PARTS LIST 45
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.
◆ 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.
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. ◆ Removal 1.
◆ 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.
GENERAL INFORMATION This color monitor automatically scans all horizontal frequencies from 30KHz to 107KHz, and all vertical frequencies from 50Hz to 160Hz. This color monitor adopted the OSD (On Screen Display), it shows the sync polarity and frequency and it provides that easily adjust control.
PIN CONNECTOR Pin Signal 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Red Green Blue GND GND GND - Red GND - Green GND - Blue +5Vdc GND - H.Sync GND - V.Sync Bi-directional Data (SDA) Horizontal Sync Vertical Sync (VCLK) Data Clock (SCL) 1 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 & ADJUSTMENT Control Panel • • Move cursor to the right window on the OSD window. • • Move cursor to the left window on the OSD window. • Launch OSD(On-Screen Display) MENU window. • • Move cursor to the high window on the OSD window. • • Move cursor to the low window on the OSD window. Increase the value of any selected function. Decrease the value of any selected function. Increase the value of V.size or V.center. Decrease the value of V.size or V.center.
Key Process ENGL SH DEUTSCH ESPAÑOL FRANCA S TAL ANO MENU Start • When you choose the icon on the OSD window, you can exit the OSD screen.
OSD Functions ICON CONTROL FUNCTIONS LANGUAGE Select language for OSD (5 languages). H. CENTER & Adjust the position of the display horizontally(left or right) and vertically (up or down). V. CENTER COLOR TEMP Choose different preset color temperatures or set your own customized color parameters. RED GAIN Adjust the red gain. GREEN GAIN Adjust the green gain. BLUE GAIN Adjust the blue gain. RED BIAS Adjust the red bias. GREEN BIAS Adjust the green bias. BLUE BIAS Adjust the blue bias.
ICON CONTROL FUNCTIONS ZOOM Adjust the display width & height at the same time. 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. PIN BALANCE Adjust the side balance when the sides of the screen are bowed towards left or right. PARALLELOGRAM Adjust the parallelogram when the screen is leaning left or right.
Self Diagnosis When the monitor doesn’t display, if you press any key, Self Diagnosis screen is displayed. Self Diagnosis function checks if the status of the monitor is No Signal or Out of range. 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 Adjustment Conditions 1. Power source voltage : AC 100 - 240Vac, 50/60Hz. 2. Aging : Take at least 15 minutes warm-up time. 3. Signals. Video : Analog 0.7Vpp 75Ω terminal positive polarity Synchronizing : H+V Sync on Green : 0.286Vpp ± 5% (Negative) Composite H+V Sync : 1.0Vpp ~5.
(l) Select the B - GAIN and adjust the / key to get the color coordinates in Y=0.311±0.015. (m) Select the R - GAIN and adjust the / key to get the color coordinates in X=0.281±0.015. (n) Adjust the ABL VR to get the screen luminosity up to 26Ft/L. (o) Check if the x,y coordinates of color analyzer is in x=0.281 ± 0.015, y=0.311 ± 0.015. If the color coordinates is out of range, adjust the R.G.B Bias & Gain to get the coordinates in X=0.281, Y=0.311.
TROUBLESHOOTING HINTS 1.
2. No Raster No Raster Is CRT heater red-hot? Is Heater Voltage (CRT PCB) about 6.3V? No Yes Yes Trouble in CRT No Trouble in power supply circuit Turn the Brightness & Contrast control fully Maximum Refer to trouble in P.S.
3. A missing Color One color is missing Is input signal normal? No Check video signal cable or video card. No Trouble in IC802 or its ambient circuit. No Is video output IC803 waveform normal? 0.7Vpp Yes Is the output of pre-amp (IC802, M52742ASP) pin 29, 32, 35 all normal? Yes Is CRT Cathode (Rk, Gk, Bk) normal? Rk, Gk, Bk About 45Vpp Yes Yes Trouble in 80Vdc line.
4. Abnormal OSD Font Abnormal OSD Font Is menu key selected? Is OSD Font exist? * If menu key selected. Is the Fast Blanking signal normal? No Yes Yes One color is missing Trouble in IC802 or its ambient circuit Yes Is the output of IC804 (pin 13, 14, 15) normal? No Trouble in IC804 and its ambient circuit Yes Refer to Missing Color 19 No Trouble in IC804 or its ambient circuit.
5. Horizontal Output Circuit Trouble in Horizontal output circuit (No Raster) Is the B+ line voltage normal? No Refer to abnormal H.Size. Yes 12V 13Vpp Is Q505 base waveform normal? Yes Trouble in Q505. NO 12Vpp Is the Collector waveform of Q502 or Q503 normal? Yes Trouble in Q504, T506. NO 0.7V 0.2V Is IC501 pin17 H.OSC waveform normal? Yes Trouble in Q502, Q503. NO Is IC501pin16 voltage about 12V? No Trouble in Power Supply Unit. Yes Is the input H.Sync correct? NO Trouble in H.
6. Unstable Picture 6-1. Horizontal Unstable picture Is the pulse of pin26 of the IC501 correct? Yes Trouble in IC501 or its ambient circuits. Yes Check IC201 and its ambient circuits. Yes Check IC201 and its ambient circuits. 5Vpp NO Is the pulse of pin 42 of the IC201 correct? 5Vpp NO Is the input H.Sync correct? NO 0.7Vpp Trouble in Signal Cable or 15P D-Sub Connector.
6-2. V.OSC/Deflection Circuit Unstable or Abnormal picture Is +17Vdc, -13Vdc line correct? No 1. Trouble in P.S.U. 2. Check the D108(-13Vdc), Q106(+17Vdc) and their ambient circuit. Yes 106KHz/85Hz 50Vpp Is the output waveform of IC401 (pin 5) normal? 6Vpp 0 Yes V.DY failure. 8Vpp No Is the output pulse of IC501 (pin 8) normal? No Trouble in V.Sync line or IC501 failure. 22 Yes Trouble in IC401 or its ambient circuit.
7. Focus Monitor remains unfocused Adjust finely Focus VR in HVG Is focus acceptable? Yes OK No Trouble in Focus circuit (HVG) No 23 Refer to focus is poor.
7-1. Dynamic Focus Focus is poor FVH FVV HITACHI : 450V 180V SAMSUNG : 370V 180V FVH FVV Is the waveform of the DF pin in HVG (pin 1) correct? Yes 1. Check the CRT socket or connector wire. 2. Trouble in HVG or CRT. Yes 1. Check the waveform of the pin 1 of HVG. 2. Check D620, D619. No Is the collector voltage of the Q605 about 650V? No Is the base voltage waveform of the Q605 correct? No 1. Check the 12V DC line. 2. Check Q607, Q602, Q603, Q605 and Q604. 3.
8. 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.
9. Abnormal Picture 9-1. Horizontal Size *At first, adjust controls in the OSD MENU. Abnormal H. Size Is the changeable the B+ line voltage? No OK Yes 226V 0 Is the gate voltage of the Q521 correct? Yes Trouble in D507, D520. NO 12V 10V 0 Is the waveform of the pin6 in IC505 correct? Yes Check the Q520, D505 and their ambient circuit. Yes Check the IC508, Q506 and their ambient circuit. NO 3.0V Is the waveform of the pin4 in IC505 correct? 1.4V 0 NO 3.1V 2.
9-2. Vertical Size Abnormal V.Size Is changeable the DC voltage of IC401 pin 1? No Is changeable the DC level of pin 8 of the IC501? No Yes 106KHz/85Hz Is the waveform of the pin5 of IC401 correct? Check the IC501 and its ambient circuit No 50Vpp 6Vpp 0 Yes 8Vpp Trouble in R410. 27 1. Trouble in IC401. 2. Check the +12Vdc line. Yes Trouble in R401, C401.
10. High Voltage Output Circuit Trouble in H.V output circuit Is VB+(+185Vdc), 12V lines correct? No Refer to trouble in R.S.V. Yes Is the voltage of the pin3 (ON/OFF) in HVG ON level(1.5V~15V)? No Trouble in R628, R629. Yes No Check the EHT set (pin 4 in HVG) EHT set : R( ) EHT(KV) 1K 330K 2M2 8 Is the value of the R622 correct? Yes Trouble in HVG 28 25 26 27 27.
11. Side-Pincushion Circuit Side-Pincusion distortion is excessive or barrel When the side pincushion is selected on the OSD menu, is it adjusted at the acceptable position? Yes O.K Yes Check IC504 or its ambient circuit. Yes Check IC501 or its ambient circuit. No Is the waveform of pin9 in IC501correct ? No Is the waveform of pin28 in IC501(V. Sync) normal? No Trouble in V Sync.
12. 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 bridge D001. No 1. Replace Q003. 2. Replace TH001. No Trouble in bridge diode D001 or peripheral device. No Trouble in T001, IC001 and check cold soldering of IC001. Yes Is the TH001 OK? Is TR Q003 OK? Yes Is voltage of T001 pin 1 130V (370V)? Yes Is the waveform of T001 pin 7 correct? Yes Is voltage of C103 226Vdc? No Trouble in D102, D103.
A Is voltage of C107 28Vdc? No Trouble in D105. Yes Is voltage of C111 17Vdc? No Trouble in Q106, D106. Yes Is voltage of C128 12Vdc? No Trouble in IC103. Yes Is voltage of C118 -13Vdc? No Trouble in D108. Yes Is voltage of C109 5Vdc? No Yes P.S.U O.K 31 Trouble in IC101.
32 KA3882 START-UP MC34262 STEP-UP PFC(OPTION) EEPROM 24C08 KEY CONTROL DDC H/V RGB HV RGB HV SYNC H/V VIDEO BNC VIDEO D-SUB FLYBACK CIRCUIT MCU 68HC05 BD32 SELECT.& SYNC SEP.
PCB LAYOUT Main PCB Component Side 33
Main PCB Solder Side 34
Video PCB Component Side 35
Video PCB Solder Side 36
Control PCB Component Side Control PCB Solder Side 37
Socket PCB Component Side Socket PCB Solder Side 38
SCHEMATIC DIAGRAM Power & PFC Circuit 39
MCU OSD Key Deflection Dynamic Circuit 40
Deflection & H/V Circuit 41
Video & Vertical & Convergence & Tilt Circuit 42
EXPLODED VIEW & MECHANICAL PARTS LIST 43
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 F J K M G Tolerance ± 1% ± 5% ± 10% ± 20% ± 2% Example: Fig & Index Part No R101 Resistors RD-4Z820J Cabron: 82J Description 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. LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC 00020 9979500017 RECEPTACLE 03GEEG3B-SL/FILTER EMI BD806 5PB13857-- COIL BEAD BI3857(AXIAL) ! 00020 W3475N731- CORD POWER 3 H05VV-F 3X0.75 1.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC C124 CMXM2A104J C MYLAR 100V 0.1MF J (TP) C250 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C125 CEXF1C101C C ELECTRO 16V RUS 100MF (6.3X11) TP C301 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C127 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C302 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C128 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C303 HCBK104KCA C CHIP CERA 50V X7R 0.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC C516 CEXF1C471C C ELECTRO 16V RUS 470MF (10X12.5)TP C569 CMYA2G124J C MYLAR MPA 400V 0.12MF J BULK C517 HCQK102JCA C CHIP CERA 50V CH 1000PF J 2012 C570 CMXF2G104J C MYLAR MPP 400V 0.1MF J C518 CEXE1H229C C ELECTRO 50V RU 2.2MF (5X11) TP C571 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C519 CEXE1H229C C ELECTRO 50V RU 2.2MF (5X11) TP C572 HCBK104KCA C CHIP CERA 50V X7R 0.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC C803 HCBK103KCA C CHIP CERA 50V X7R 0.01MF K 2012 C845 HCQK220JCA C CHIP CERA 50V CH 22PF J 2012 C8031 HCBK103KCA C CHIP CERA 50V X7R 0.01MF K 2012 C846 CEXD2A109F C ELECTRO 100V RND 1MF(5*11) TP C8032 CEXF1C221C C ELECTRO 16V RUS 220MF (8X11.5) TP C847 CEXF2A221D C ELECTRO 100V RMU 220MF(12.5*25)TP C8033 HCBK104KCA C CHIP CERA 50V X7R 0.1MF K 2012 C848 HCBK104KCA C CHIP CERA C8034 HCBK104KCA C CHIP CERA 50V X7R 0.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC C903 HCQK221JCA C CHIP CERA 50V CH 220PF J 2012 D202 DZN4148--- DIODE 1N4148 AUTO 52MM C991 CCXE3D103P C CERA HIKE 2KV 0.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC D809 DZN4148--- DIODE 1N4148 AUTO 52MM EF104 5PF1FH104M FILTER LC CFI-06-F-1H-104M D810 D1NS4----- DIODE 1NS4 EF201 5PF1FH104M FILTER LC CFI-06-F-1H-104M D811 DZN4148--- DIODE 1N4148 AUTO 52MM EF202 5PF1FH104M FILTER LC CFI-06-F-1H-104M D812 DZN4148--- DIODE 1N4148 AUTO 52MM EF203 5PF1FH104M FILTER LC CFI-06-F-1H-104M D813 RD-AZ100J- R CARBON FILM 1/6 10 OHM J EF501 5PF1FH104M FILTER LC CFI-06-F-1H-104M
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC Q001 T2SK2676-- FET 2SK2676 Q801 TBFQ221--- TR BFQ221 Q002 TKST2222A- TR CHIP KST2222A Q802 TZSC1009Y- TR KSC1009-Y (AUTO) Q003 TKSC2688-Y TR KSC2688-Y Q803 TKSA910Y-- TR KSA910Y Q101 TKST2222A- TR CHIP KST2222A Q804 TKSR1102-- TR CHIP KSR1102 Q104 TKTA1281Y- TR KTA1281Y Q805 TKST2222A- TR CHIP KST2222A Q105 TKSR1102-- TR CHIP KSR1102 Q806 TKST2222A- TR CHIP KST2222A Q106 TKTA1281Y- TR KTA1281Y
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC R118 HRFT561JCA R CHIP 1/10 560 OHM J 2012 R235 RD-4Z151J- R CARBON FILM 1/4 150 OHM J R119 RD-4Z331J- R CARBON FILM 1/4 330 OHM J R239 HRFT102JCA R CHIP 1/10 1K OHM J 2012 R121 HRFT822JCA R CHIP 1/10 8.2K OHM J 2012 R240 HRFT103JCA R CHIP 1/10 10K OHM J 2012 R122 HRFT102JCA R CHIP 1/10 1K OHM J 2012 R241 RD-AZ203J- R CARBON FILM 1/6 20K OHM J R123 RD-4Z432J- R CARBON FILM 1/4 4.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC R502 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R556 HRFT104JCA R CHIP 1/10 100K OHM J 2012 R503 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R557 RS01Z154J- R M-OXIDE FILM 1W 150K OHM J(TAPPING) R504 RD-AZ102J- R CARBON FILM 1/6 1K OHM J R558 RD-2Z109J- R CARBON FILM 1/2 1 OHM J R505 HRFT392JCA R CHIP 1/10 3.9K OHM J 2012 R559 RS01Z479J- R M-OXIDE FILM 1W 4.7 OHM J (TAPPING) R506 HRFT222JCA R CHIP 1/10 2.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC R611 RD-2Z474J- R CARBON FILM 1/2 470K OHM J R803 RD-AZ220J- R CARBON FILM 1/6 22 OHM J R612 RD-4Z100J- R CARBON FILM 1/4 10 OHM J R804 RN-AZ7509F R METAL FILM 1/6 75.
LOC PART-CODE PART-NAME PART-DESC LOC PART-CODE PART-NAME PART-DESC R858 RD-AZ221J- R CARBON FILM 1/6 220 OHM J R908 HRFT750JCA R CHIP 1/10 75 OHM J 2012 R859 HRFT102JCA R CHIP 1/10 1K OHM J 2012 R909 HRFT750JCA R CHIP 1/10 75 OHM J 2012 R860 HRFT102JCA R CHIP 1/10 1K OHM J 2012 R910 RD-4Z220J- R CARBON FILM 1/4 22 OHM J R861 RN-AZ7509F R METAL FILM 1/6 75.0 OHM F R921 HRFT202JCA R CHIP 1/10 2K OHM J 2012 R862 RN-AZ7509F R METAL FILM 1/6 75.
DAEWOO ELECTRONICS CO., LTD 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : "DAEWOOELEC" E-mail : G7F00E@web.dwe.co.
