Instruction/ maintenance manual of the product 531X Daewoo
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D AEW OO ELECTR ONICS CO ., L TD . http : //svc.dwe .co .kr Service Manual XGA COLOR MONIT OR Model : 531X September , 2000 Warning The data contained within this manual may not reflect your configuration. Please verify this information matches your model before making repairs.
CONTENTS SAFETY PRECAUTIONS 1 GENERAL SAFETY INFORMA TION 2 SER VICING PRECAUTIONS 3 TECHNICAL INFORMA TION 6 GENERAL INFORMA TION 7 PIN CONNECTOR 8 CAUTIONS FOR ADJUSTMENT AND REP AIR 8 OPERA TION AN.
1 SAFETY PRECAUTIONS ◆ Safety Check Care should be taken while servicing this analog color display because of the high voltages used in the deflection circuits.
2 W arning: This product includes critical mechanical and electrical parts which are essential for x ray protection. For continued safety , replace critical components that are indicated in the service manual with exact replacement parts given in the parts list.
3 SERVICING PRECAUTIONS ◆ General Servicing Precautions 1. Always unplug the AC power cord from the AC power source before: a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly . b. Disconnecting or reconnecting any electrical plug or other electrical connection.
4 ◆ 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.
5 FIGURE 1. USE SOLDERING IRON TO PR Y 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.
6 ◆ Power IC, T ransistor 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.
This color monitor automatically scans all horizontal frequencies from 30KHz to 54KHz, and all vertical frequencies from 50Hz to 160Hz. This color monitor supports IBM PC, PC/XT, PC/AT, personal Syste.
8 Pin Signal 1 Red 2 Green 3 Blue 4 GND 5 GND 6 GND - Red 7 GND - Green 8 GND - Blue 9 +5Vdc 10 GND - H.Sync 1 1 GND - V .Sync 12 Bi-directional Data (SDA) 13 Horizontal Sync 14 V ertical Sync (VCLK) 15 Data Clock (SCL) • Degaussing is always required when adjusting purity or convergence.
9 OPERA TION AND ADJUSTMENT Contr ol Panel • Move cursor to the right window on the OSD window . • Increase the value of any selected function. • Move cursor to the left window on the OSD window . • Decrease the value of any selected function.
10 • When you choose the icon on the OSD window , you can exit the OSD screen. OSD OFF MENU MENU MENU MENU Key Process.
11 OSD Functions ICON CONTROL FUNCTIONS Adjust the pin corner bottom when the bottom sides of the screen are bowed. B. PIN CORNER Adjust the parallelogram when the screen is leaning left or right. Adjust the pin corner top when the top sides of the screen are bowed.
12 Reset the screen to the Factory Preset Display Settings. RECALL ICON CONTROL FUNCTIONS Adjust the vertical picture moire cancellation. V. MOIRE Adjust the horizontal picture moire cancellation.
ALIGNMENT PROCEDURE ◆ Standard Adjustment Conditions 1. Power source voltage : 100-240V ac 50/60Hz 2. Aging : T ake at least 20 minutes warm-up time.
14 6. Static Convergence Adjustment (a) Apply a magenta cross hatch pattern on display . (b) Adjust the focus from the best over all focus on the display . Also adjust the brightness to the desired condition. (c) V ertical red and blue lines are conver ged by varying the angle between the two tabs of the 4-pole magnets.
15 TROUBLESHOOTING HINTS 1. No Character Change the Contrast & Brightness control value to maximum No Raster Refer to No Raster Check the peripheral circuit of CRT Check the video output circuit a.
16 2. No Raster Trouble in power supply circuit Trouble in power supply circuit Trouble in G1 line Trouble in FBT or its pin4 ambient circuit High Voltage trouble in FBT Trouble in 100Vdc line of power supply unit Refer to trouble in P.S.U Refer to trouble in power supply unit.
17 3. A Missing Color Is input signal normal? One color is missing CRT Cathode (Rk, Gk, Bk) is normal? Is video output IC802 waveform normal? Each grid (G1, G2) voltage normal? Is the output of pre-amp (IC801,TDA9210) pin 14, 16,18 all normal? Check video signal cable or video card.
18 4. Abnormal OSD Font Is menu key selected? Is OSD Font exist? * If menu key selected. Is Heater Voltage about 6V? Abnormal OSD Font Is the output of IC204 (pin 13, 14, 15) normal? Trouble in Heater voltage line.
MODE B+ Voltage VGA 60Vdc Super VGA 72Vdc 54KHz 110Vdc 19 5. Horizontal Output Circuit Is the B+line voltage over 50V? Is the H-out waveform of IC501 normal? Trouble in IC501 Trouble in Horizontal output circuit (No Raster Yes No Is the Collector wave form of Q504 normal? Yes Yes Yes Trouble in Q505 No No No Trouble in Q505 and its ambient circuit.
20 6. Unstable Picture 6-1. Horizontal Unstable picture Is the pulse of pin 26 of the IC501 correct? Trouble in IC501 or its ambient circuit Is the pulse of pin 28 of the IC201 correct? Check IC501 and its ambient circuit No No No Yes Yes Is the input H.
21 6-2. V ertical Unstable picture Is the 12V,-12Vdc line voltage is correct? Refer to P. S. U Is the pulse of pin 6 of the IC401 correct? Trouble in vertical D.
22 7. Focus Monitor remains unfocused Check Focus VR in FBT Is focus acceptable? Trouble in Focus circuit (FBT) Yes OK No.
23 8. Convergence Is convergence on the center area bad? Is convergence on the fringe area bad? Adjust static convergence Refer to Adjustment procedure of convergence Yes Adjust D.
MODE B+ Voltage VGA 60Vdc Super VGA 72Vdc 54KHz 110Vdc 24 9 . Abnormal Picture 9-1. Horizontal Size Trouble in L503, C520 or their ambient circuit Trouble in Horizontal output circuit Check the B+ and anode voltage of CRT.
25 9-2. V ertical Size Is changeable the DC voltage of IC401 pin 1? Check the IC401 and its ambient circuit Check the IC501 and its ambient circuit No No Trouble V.OSC/ Deflection Circuit Refer to V.OSC/Deflection circuit Yes Is the 3.5Vdc of pin 21of the IC501? Yes Abnormal V.
26 10. Side-Pincushion Circuit Check the Base waveform of the Q515 Yes Pincusion distortion is excessive or barrel O.K Select the side-pincushion icon in OSD menu, and adjust acceptable position.
27 1 1. Power Supply Unit (P .S.U) Is the IC001 O.K? Replace IC001 No Is voltage of C104 50Vdc? No Is voltage of D002 130V (270V)? Trouble in switching power transformer T001 or IC001 and its ambient circuit Trouble in diode D001,D002,D003,D004 or peripheral device No Is the waveform of T001 pin5 correct? Trouble in T001 or D101 No Trouble in P.
28 Is voltage of C105 8Vdc? Trouble in D103 No Is voltage of C109 13Vdc? No Yes Yes Yes Is voltage of C108 -12Vdc? Trouble in D104 or vertical part P.S.
29 BLOCK DIAGRAM CM C- 5 3 1 X MO NI TOR BLOCK DI A G RA M CR T SO CKET CR T : O rion Mini -N eck 15" D - SUB RG B H/ V Vi deo Pre-am p ( 65M Hz ) TD A921 0 ( S GS T hom pson) OS D NT 6828 (N ov .
PCB LA YOUT 30 Main PCB Component Side.
31 Main PCB Solder Side.
32 CRT PCB Component Side CRT PCB Solder Side.
33 SCHEMA TIC DIAGRAM Power & Connection Section.
34 Control & V ert. out Section.
35 Horizontal Section.
36 V ideo Section.
EXPLODED VIEW DIAGRAM 37.
38 RESISTOR Description Example: CAP ACIT OR Description Example: Fig & Part No Description Index Capacitors C102 CCXF1H104Z Ceramic 50V 0.1 µ F Z C402 CCXB1H331K Ceramic 50V 330PF K C105 CMXM 2A224J MYLAR 100V 0.22 µ FJ Allowance C ± 0.25pF D ± 0.
39 00001 9979800540 PCB MAIN T=1.6*246*247 (531X) 00002 9979800548 PCB CRT T=1.6*108*82(531X) 00020 W3475N731- CORD POWER 3 H05VV-F 3X0.75 1.8 IV B001 5PB13890-- COIL BEAD BI3890 B006 5PB13890-- COIL .
40 C536 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP C538 CEXF1H109V C ELECTRO 50V RSS 1MF (5X11) TP C541 CMXM2A103J C MYLAR 100V 0.01MF J (TP) C542 CMXM2A152J C MYLAR 100V 1500PF J (TP) C543 CEXD1H339W C ELECTRO 50V RHD 3.3MF(16*25) C550 CMXM2A224J C MYLAR 100V 0.
41 D612 DRGP10K--- DIODE RGP10K D613 DRGP10K--- DIODE RGP10K D801 DZN4148--- DIODE 1N4148 AUTO 52MM D802 DZN4148--- DIODE 1N4148 AUTO 52MM D803 DBAV20---- DIODE BAV20 D804 DBAV20---- DIODE BAV20 D831 .
42 R113 RD-AZ562J- R CARBON FILM 1/6 5.6K OHM J R202 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R203 RD-AZ101J- R CARBON FILM 1/6 100 OHM J R204 RD-AZ202J- R CARBON FILM 1/6 2K OHM J R205 RD-AZ101J- R CAR.
43 R545 RD-AZ471J- R CARBON FILM 1/6 470 OHM J R547 RS01Z688J- R M-OXIDE FILM 1W 0.68 OHM J R548 DTVR1G---- DIODE TVR1G TPA1 R549 RD-AZ153J- R CARBON FILM 1/6 15K OHM J R550 RD-AZ154J- R CARBON FILM 1/6 150K OHM J R551 RD-AZ154J- R CARBON FILM 1/6 150K OHM J R553 RD-2Z758J- R CARBON FILM 1/2 0.
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.
An important point after buying a device Daewoo 531X (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Daewoo 531X yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Daewoo 531X - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Daewoo 531X you will learn all the available features of the product, as well as information on its operation. The information that you get Daewoo 531X will certainly help you make a decision on the purchase.
If you already are a holder of Daewoo 531X, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Daewoo 531X.
However, one of the most important roles played by the user manual is to help in solving problems with Daewoo 531X. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Daewoo 531X along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
