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Daewoo 432X Service Manual - General Information

Manual is about: XGA COLOR MONITOR

Summary of 432X

  • Page 1

    Service manual xga color monitor model : 432x / 523x daewoo electronics co., ltd overseas service dept..

  • Page 2: Contents

    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 12 troubleshooting hints 14 block diagram 28 pcb layout 29 schematic di...

  • Page 3: Safety Precautions

    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. These voltages are exposed in such areas as the associated flyback and yoke circuits. ◆ fire & shock hazard • insert an isolation transform...

  • Page 4: General Safety Information

    2 warning: this product includes critical mechanical and electrical parts which are essential for x radiation safety. For continued safety, replace critical components indicated in the service manual only with exact replacement parts given in the parts list. Operating high voltage for this product i...

  • Page 5: Servicing Precautions

    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 con...

  • Page 6

    4 ◆ electrostatically sensitive (es) devices some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called electrostatically sensitive (es) devices. The examples of typical es devices are integrated circuits, some field-effect transistors a...

  • Page 7

    5 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 repl...

  • Page 8: Technical Information

    6 ◆ 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 clip off ...

  • Page 9: General Information

    7 general information this color monitor automatically scans all horizontal frequencies from 30khz to 54khz, and all vertical frequencies from 50hz to 120hz. 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 g...

  • Page 10: Pin Connector

    8 • degaussing is always required when adjusting purity or convergence. • the white balance adjustment has been done by a color analyzer in factroy. The adjustment procedure, described in the service manual is made by a visual check. • allow 20 minutes warm-up time for the display before checking or...

  • Page 11: Operation and Adjustment

    9 operation and adjustment control 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. • launch osd(on-screen display) menu window. • move cursor t...

  • Page 12: •

    10 key process menu start • when you choose the icon on the osd window, you can exit the osd screen. Hot key brightness contrast.

  • Page 13

    11 icon control functions adjust the width (horizontal size) and the height (vertical size) of the display. Display horizontal & vertical frequency and polarity. Degaussing keeps the monitor free from unwanted magnetism that can result in color impurity. H. Size & v. Size degauss status select langu...

  • Page 14: Alignment Procedure

    12 alignment procedure ◆ standard adjustment conditions 1. Power source voltage: 100-240vac 50/60hz 2. Aging: take at least 20 minutes warm-up time. 3. Signals video:analog 0.7vpp 75 Ω terminal positive polarity synchronizing:ttl level negative/positive separate deflection frequency horizontal frequ...

  • Page 15

    13 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) vertical red and blue lines are converged by varying the angle between the two tabs of th...

  • Page 16: Troubleshooting Hints

    14 troubleshooting hints 1. No character are the contrast & brightness controls in osd menu maximum? 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 and its ambient circuit trouble in 8vdc line ...

  • Page 17

    15 2. No raster trouble in power supply circuit trouble in video circuit trouble in g1 line of main pwb trouble in fbt high voltage trouble in fbt trouble in 65vdc line of power supply unit refer to trouble in p.S.U refer to trouble in power supply unit. Is crt heater red-hot? No yes no no no no yes...

  • Page 18

    16 3. A missing color is input signal normal? One color is missing crt cathode (rk, gk, bk) is normal? Is video output q801, q831, q861 waveform normal? Each grid (g1, g2) voltage normal? Is the output of pre-amp ic801 pin 15, 19, 22 all normal? Check video signal cable or video card. Trouble in ic8...

  • Page 19

    17 4. Abnormal osd font is menu key selected? Is osd font exist? One color is missing abnormal osd font is the output of ic204 (pin 21, 22, 23) normal? Refer to missing color no yes yes yes * if menu key selected. Trouble in ic801 and its ambient circuit no no yes is the fast blanking signal (ic204 ...

  • Page 20

    18 5. Horizontal output circuit is b+ line boltage normal? Is q506 base waveform normal? Trouble in power supply circuit refer to trouble in power supply unit trouble in fbt trouble in horizontal output circuit (no raster) yes no q505 and its ambient cirucit trouble in q505, t501 if the holddown cir...

  • Page 21

    19 6. Unstable picture 6-1. Horizontal unstable picture is the pulse of pin 15 of the ic501 correct? Trouble in ic501 or its ambient circuit is the pulse of pin 33 of the ic201 correct? Check ic501 and its ambient circuit no no no yes yes is the input h.Sync correct? Check ic201 and its ambient circ...

  • Page 22

    20 6-2. Vertical unstable picture is the 15vdc line voltage is correct? Refer to p. S. U is the pulse of pin 4, 6 of the ic401 correct? Trouble in vertical d. Y no no no yes yes is the output of pin 12,13 of ic501 all normal? Check ic401 and its ambient circuit yes check the ic501 and its ambient ci...

  • Page 23

    21 7. Focus monitor remains unfocused check focus vr in fbt is focus acceptable? Trouble in focus circuit (fbt) yes ok no.

  • Page 24

    22 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.Y location yes no poor convergence.

  • Page 25

    23 9. Abnormal picture 9-1. Horizontal size trouble in l503, c539 or their ambient circuit trouble in horizontal output circuit check the b+ and anode voltage of crt. Trouble in h.Osc/ deflection circuit refer to horizontal output circuit is the dc level of the base of q521 changeable? No yes is the...

  • Page 26

    24 9-2. Vertical size is the dc voltage of c219 changeable ? Check the ic201 and its ambient circuit no trouble in vertical output circuit refer to vertical output circuit yes abnormal v.Size.

  • Page 27

    25 10. Side-pincushion circuit check the q518, q522 and its ambient circuit yes pincusion distortion is excessive or barrel o.K select the pincushion icon in osd menu, and adjust acceptable position. Yes is the waveform of ic501 (pin 11) correct? No no check the ic501 and its ambient circuit.

  • Page 28

    26 11. Power supply unit (p.S.U) is the ic001 o.K? Replace ic001 no is voltage of c104 65vdc? 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 corr...

  • Page 29

    27 is voltage of ic102 pin 3 5vdc? Trouble in ic102 d103 no is voltage of c108 35vdc? No yes yes yes is voltage of ic103 pin3 12vdc? Trouble in d106, q103, q104, ic103 p.S.U o.K trouble in d104, t001 no a.

  • Page 30: Block Diagram

    28 block diagram r g b r/g/b bias focus screen abl h.V main b+ video b+ v -out b+ general hea ter (+165v) (+65v) (+35v) (+15v) (+8v) dega uss scl1 sd a1 ss1 v -o s v -i s h -i s s mute h -o h/v size h/v pos g/d h-fbp h-lin v -blk scl sda f-blk r/g/b osd dy sign al in pre amp mc13282ep video out & bi...

  • Page 31

    Pcb layout 29 main pcb component side.

  • Page 32

    30 main pcb solder side.

  • Page 33

    31 video pcb component side video pcb solder side.

  • Page 34

    32 schematic diagram.

  • Page 35

    33.

  • Page 36

    34.

  • Page 37

    35.

  • Page 38

    Exploded view diagram 36.

  • Page 39: Replacement Parts List

    Replacement parts list 37 resistor description example: capacitor description example: 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 o...

  • Page 40

    38 0001 9979800483 pcb main cmc-432x t=1.6*246*310 0001 9979800484 pcb crt cmc-432x t=1.6*136*105 b001 5pb13890-- coil bead bi3890 b002 5pb13890-- coil bead bi3890 b003 5pb13857-- coil bead bi3857(axial) b004 5pb13857-- coil bead bi3857(axial) b005 5pb13857-- coil bead bi3857(axial) b006 5pb13857-- ...

  • Page 41

    39 c514 cmxm2a104j c mylar 100v 0.1mf j (tp) c515 hczk104zca c chip cera 50v z5u 0.1mf z 2012 c516 ccxb2h102k c cera 500v b 1000pf k (tapping) c517 cmxm2a104j c mylar 100v 0.1mf j (tp) c518 cexf1h101v c electro 50v rss 100mf (8x11.5) tp c519 cmxh3c602j c mylar bup 1.6kv 6000pf j c520 cmxe2j822j c my...

  • Page 42

    F001a 9977410900 fuse clip bsp3-h t0.4 sn 5.2 f001b 9977410900 fuse clip bsp3-h t0.4 sn 5.2 ic001 1strf6653- ic power str-f6653 ic101 1ka431zta- ic shunt ka431zta ic102 1xc62a500- ic regulator xc62ap5002th ic103 1k1a7812p1 ic regulator kia7812pi ic201 1dwm240t-- ic micom nt68p62 ic202 1m24c04bn6 ic ...

  • Page 43

    R111 rd-az102j- r carbon film 1/6 1k ohm j r112 rd-az102j- r carbon film 1/6 1k ohm j r120 rn-az1503f r metal film 1/6 150k ohm f r121 rn-az2201f r metal film 1/6 2.2k ohm f r122 hrft204jca r chip 1/10 200k ohm j 2012 r123 rd-az562j- r carbon film 1/6 5.6k ohm j r124 hrft152jca r chip 1/10 1.5k ohm ...

  • Page 44

    R511 rd-az103j- r carbon film 1/6 10k ohm j r512 hrft393jca r chip 1/10 39k ohm j 2012 r513 hrft222jca r chip 1/10 2.2k ohm j 2012 r514 rd-az122j- r carbon film 1/6 1.2k ohm j r515 rd-az362j- r carbon film 1/6 3.6k ohm j r516 hrft273jca r chip 1/10 27k ohm j 2012 r517 rd-az474j- r carbon film 1/6 47...

  • Page 45

    R844 rd-4z220j- r carbon film 1/4 22 ohm j r845 rc-2z470j- r carbon comp 1/2 47 ohm j r847 rd-az105j- r carbon film 1/6 1m ohm j r848 hrft104jca r chip 1/10 100k ohm j 2012 r849 hrft473jca r chip 1/10 47k ohm j 2012 r850 hrft273jca r chip 1/10 27k ohm j 2012 r851 hrft622jca r chip 1/10 6.2k ohm j 20...

  • Page 46: Service Manual

    Service manual daewoo electronics co., l t d overseas ser vice dept . Daewoo electronics co., ltd 686, ahyeon-dong mapogu, seoul, korea. C.P.O. Box 8003 seoul korea telex: dwelec k28177-8 cable: "daewooelec" fax: 02) 590-6291 tel: 02) 360-7114/590-6151~5 http://www.Dwe.Daewoo.Co.Kr printed date:june...