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Daewoo CMC-518X Service Manual - Technical Information

Manual is about: XGA COLOR MONITOR

Summary of CMC-518X

  • Page 1

    Service manual xga color monitor model : cmc-518x daewoo electronics co., ltd. Overseas service dept. Ser v ice manual d a ew oo electr onics co., l t d ..

  • 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 alignment procedure 9 troubleshooting hints 11 operation & adjustment 25 block diagram 28 pcb layout 29 schematic diag...

  • Page 3: 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 transformer between the analog col...

  • Page 4

    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...

  • Page 5: 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. C. Connecting a t...

  • Page 6

    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 and s...

  • Page 7

    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...

  • Page 8: Technical Information

    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 exces...

  • Page 9: General Information

    This color monitor automatically scans all horizontal frequencies from 30khz to 64khz, and all vertical frequencies from 50hz to 120hz. This color monitor adopted the osd (on screen display), it shows the sync polarity and frequency and it provides that easily adjust control. This color monitor supp...

  • Page 10: Pin Connector

    Arrangement of 15-pin d-sub connector ¡ 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 tim...

  • Page 11: Alignment Procedure

    Standard adjustment conditions 1. Power source voltage : 100~240vac 50/60hz 2. Aging : tak e at least 20 minutes warm-up time. 3. Signals video : analog 0.7vpp 75 Ω terminal positive polarity synchronizing : ttl level negative/positive separate/composite deflection frequency horizontal frequency : 3...

  • Page 12

    (k) select 6550 ¡£ k on the osd menu and set the color coordinates in x=0.313, y=0.329 at the maximum contrast control and center brightness control. (l) check if the a full white pattern is over 30ft/l. If you satisfied with the result, readjust the internal sub contrast vr. 6. Static convergence a...

  • Page 13: Troubleshooting Hints

    11 1. No character troubleshooting hints yes yes no about 45vpp yes no no no character are the contrast & brightness controls maximum ? Is whole screen bright? Is crt cathode (rk, gk, bk) signal level normal? Is 8vdc line normal? Is the output signal of the (pin 15, 19, 22) pre-amp ic801, normal? Rk...

  • Page 14

    12 2. No raster no no refer to trouble in power supply unit. No no no yes yes yes yes yes yes refer to trouble in p.S.U is heater voltage (crt pwb) about 6v? Is crt heater red-hot? Is whole screen bright? Check g1 voltage about -70v? Is crt g2 (screen) voltage about 560v? Is 65vdc line normal? Yes d...

  • Page 15

    3. A missing color 13 no no no no rk, gk, bk about 45v p-p no yes yes yes yes 0.7vpp check video signal cable or video card. Trouble in ic801 or its ambient circuit trouble in g1 line and g2 line one color is missing is input signal normal? Is the output of pre-amp ic801, pin 15, 19, 22 all normal? ...

  • Page 16

    4. Abnormal osd font 14 no yes yes trouble in ic801 and its ambient circuit trouble in ic204 and its ambient circuit trouble in ic204 or its ambient circuit abnormal osd font is menu key selected? Is osd font exist? No is the fast blanking signal (ic204 pin12) normal? No yes is the output of ic204 (...

  • Page 17

    5. Horizontal output circuit 15 11vp-p 14.5vp-p 4vp-p yes yes yes yes is b+ line voltage normal? Is q502 base waveform normal? Mode vga s.Vga 54khz no no no trouble in fbt no refer to trouble in power supply unit trouble in power supply circuit yes no trouble in q501, t501 q501 and its ambient ciruc...

  • Page 18

    6. Unstable picture 6.1 horizontal 16 yes no trouble in ic501 or its ambient circuit unstable picture is the pulse of pin 15 of the ic501 correct? Yes no check ic201 and its ambient circuit is the pulse of pin 33 of the ic201 correct? Yes no check the ic201 and its ambient circuit is the input h.Syn...

  • Page 19

    6-2.Vertical 17 yes no refer to p.S.V unstable picture is the 12vdc line voltage is correct? Yes no trouble in vertical d.Y is the pulse of pin 4, 6 of the ic401 correct? Yes no check the ic401 and its ambient circuit is the output of pin 12, 13 of ic501 all normal? Check the ic501 and its ambient c...

  • Page 20

    7. Focus 18 yes ok check focus vr in fbt is focus acceptable? Monitor remains unfocused trouble in focus circuit (fbt) no.

  • Page 21

    8. Convergence 19 yes yes no is convergence on the center area bad? Is convergence on the fringe area bad? Poor convergence adjust static convergence refer to adjustment procedure of convergence adjust d.Y location.

  • Page 22

    9. Abnormal picture 9.1 horizontal size * at first, adjust controls in the osd menu 20 =1100vp-p yes is changeable the dc level of the base of q508? Is changeable the dc level of pin 7 of the ic201? Is the collector pulse of q502 correct? Mode vga super vga 54khz yes refer to horizontal output circu...

  • Page 23

    9.2 vertical size 21 yes is changeable the dc voltage of ic201 pin37 refer to vertical output circuit no check the ic201 and its ambient circuit trouble in vertical output circuit abnormal v.Size.

  • Page 24

    10. Side-pincushion circuit 22 yes no o.K side-pincushion distortion is excessive or barrel select the side-pincushion icon in osd menu, and adjust acceptable position yes no check the q507, q510 and its ambient circuit is the waveform of ic501 (pin 11) correct? Check the ic501 and its ambient circu...

  • Page 25

    23 11. Power supply unit (p.S.U) no switch on no yes check the power cord outlet and diode bridge d001 no yes no yes yes yes no no a trouble p.S.U is power switch on? Is fuse f001 o.K? Is the ic002 o.K? Is voltage of d001 pin 4 130v (270v)? Is the waveform t001 pin 5 correct? Is voltage of c102 165v...

  • Page 26

    24 no trouble in d104, t001 trouble in d106, q104 or ic112 trouble in ic111 d103 p.S.U o.K yes no no yes yes a is voltage of c110 35v dc? Is voltage of ic112 pin 3 12v dc? Is voltage of ic111 pin 3 5v dc?.

  • Page 27: Operation & Adjustment

    25 operation & adjustment menu contrast brightness h.Position h.Size v.Position v.Size 1024x768 60hz 50 contrast brightness h.Position h.Size v.Position v.Size 1024x768 60hz 50 color select pincushion trapezoid color temp. R. Gain b. Gain degaussing recall 1024x768 60hz 50 50 pincushion trapezoid co...

  • Page 28

    26 1. Osd(on-screen display) menu 1 adjust the contrast of image, the difference between light and dark areas on the screen. Adjust the brightness of the entire display. Adjust the position of the display horizontally (left or right). Adjust the display width (horizontal size). Adjust the position o...

  • Page 29

    27 2. Osd (on-screen display) menu 2 adjust the left and right margins for more convex or more concave margins. ƒu image turns to by . ƒu image turns to by . Adjust the trapezoid of the screen by moving the lines inward or outward. ƒu image turns to by . ƒu image turns to by . Choose different prese...

  • Page 30: Block Diagram

    28 block diagram.

  • Page 31: Pcb Layout

    Pcb layout 29 main pcb solder side.

  • Page 32

    30 video pcb solder side.

  • Page 33

    31 main pcb component side.

  • Page 34

    32 video pcb component side.

  • Page 35: Schematic Diagram

    Schematic diagram 33.

  • Page 36

    34.

  • Page 37: Exploded View Diagram

    Exploded view diagram 35.

  • Page 38: Replacement Parts List

    36 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 replacement parts list resistor description example: capacitor descrip...

  • Page 39: Part List

    10010 pcfmcag067 cover front as cmc-518x cgnd 9970710164 crt gnd as 0.12*6*16+bl102ng=630 ! Crt 9979615003 cdt m36kxu110xx61(t) dg001 5mg0000050 coil degaussing hp-1512b 00010 99720183a0 cover front as cmc-518b cover front 00010 9972018300 cover front fr-abs gy-258a 00010 2221080957 resin abs lg af-...

  • Page 40

    38 loc part-code part-name part-desc i401b 9977012421 heat sink 124 a1050p-h24 i401c 9976012100 screw special tt2 bin 3*10 mfzn pw ic501 1tda4858-- ic h.Osc tda4858 l501 5mc0000060 coil chock tch-18a l502 5mh0000059 coil h-linearity trl-147 l504 5mc0000061 coil chock tch-12a pr001 decpac140m posisto...

  • Page 41

    39 loc part-code part-name part-desc 00010 2221080957 resin abs lg af-312 88328b(gy-275a) 00040 9972212100 cover signal fr-abs gy-258a 00010 2221080957 resin abs lg af-312 88328b(gy-275a) 00050 9977713400 spacer card nylon 6.6 dasc-6n 00030 7173401011 screw tapptite tt2 bin 4x10 mfzn 00040 7s103b408...

  • Page 42

    40 loc part-code part-name part-desc r203 hrft202jca r chip 1/10 2k ohm j 2012 r205 hrft202jca r chip 1/10 2k ohm j 2012 r207 hrft562jca r chip 1/10 5.6k ohm j 2012 r208 hrft105jca r chip 1/10 1m ohm j 2012 r209 hrft562jca r chip 1/10 5.6k ohm j 2012 r210 hrft562jca r chip 1/10 5.6k ohm j 2012 r211 ...

  • Page 43

    41 loc part-code part-name part-desc r406 hrft393jca r chip 1/10 39k ohm j 2012 r407 hrft393jca r chip 1/10 39k ohm j 2012 r414 hrft272jca r chip 1/10 2.7k ohm j 2012 r417 hrft103jca r chip 1/10 10k ohm j 2012 r418 hrft221jca r chip 1/10 220 ohm j 2012 r502 hrft153jca r chip 1/10 15k ohm j 2012 r505...

  • Page 44

    42 loc part-code part-name part-desc c018 ch1fdf222m c cera ac hikb ac400v 222m c019 ch1fdf222m c cera ac hikb ac400v 222m c101 ccxb3a101k c cera 1kv b 100pf k c102 cexf2c101v c electro 160v rss 100mf (16x25) tp c103 ccxb3a101k c cera 1kv b 100pf k c104 ceyf2a221v c electro 100v rss 220mf (16x25) c1...

  • Page 45

    43 loc part-code part-name part-desc p3 4857417500 term pin da-ib0214(d2.3/dy pin) p4 4857417500 term pin da-ib0214(d2.3/dy pin) p5 4857417500 term pin da-ib0214(d2.3/dy pin) p6 4857417500 term pin da-ib0214(d2.3/dy pin) r002 rs02z683j- r m-oxide film 2w 68k ohm j (tapping) r003 rs01z473j- r m-oxide...

  • Page 46

    44 loc part-code part-name part-desc c107 cexf1c101c c electro 16v rus 100mf (6.3x11) tp c114 cexf1e101c c electro 25v rus 100mf (6.3x11) tp c201 cexf1h229v c electro 50v rss 2.2mf (5x11) tp c210 ccxb1h102k c cera 50v b 1000pf k (tapping) c217 cexf1h479v c electro 50v rss 4.7mf (5x11) tp c218 cexf1h...

  • Page 47

    45 loc part-code part-name part-desc c513 cmxm2a104j c mylar 100v 0.1mf j (tp) c514 cmxm2a103j c mylar 100v 0.01mf j (tp) c518 cmxm2a472j c mylar 100v 4700pf j (tp) c519 ccxb1h222k c cera 50v b 2200pf k (tapping) c520 cexf1h100v c electro 50v rss 10mf (5x11) tp c522 ccxb1h103k c cera 50v b 0.01mf k ...

  • Page 48

    46 loc part-code part-name part-desc q514 tztc3198y- tr ktc3198y-(1815y) (auto) q515 tztc3198y- tr ktc3198y-(1815y) (auto) q516 tzta1270y- tr kta1270y(auto)(562y) q518 tztc3198y- tr ktc3198y-(1815y) (auto) q520 tkta1277y- tr kta1277y q521 tztc3206y- tr ktc3206y (2229y) q522 tzta1270y- tr kta1270y(au...

  • Page 49

    47 loc part-code part-name part-desc d206 dzn4148--- diode 1n4148 auto 52mm d210 dzn4148--- diode 1n4148 auto 52mm d211 dzn4148--- diode 1n4148 auto 52mm d212 dzn4148--- diode 1n4148 auto 52mm d213 dzn4148--- diode 1n4148 auto 52mm d214 dzn4148--- diode 1n4148 auto 52mm d502 dzn4148--- diode 1n4148 ...

  • Page 50

    48 loc part-code part-name part-desc j003 85801052gy wire copper 1/0.52 tin coating j014 85801052gy wire copper 1/0.52 tin coating j101 85801052gy wire copper 1/0.52 tin coating j102 85801052gy wire copper 1/0.52 tin coating j103 85801052gy wire copper 1/0.52 tin coating j105 85801052gy wire copper ...

  • Page 51

    49 loc part-code part-name part-desc j143 85801052gy wire copper 1/0.52 tin coating j144 85801052gy wire copper 1/0.52 tin coating j145 85801052gy wire copper 1/0.52 tin coating j146 85801052gy wire copper 1/0.52 tin coating j147 85801052gy wire copper 1/0.52 tin coating j148 85801052gy wire copper ...

  • Page 52

    50 loc part-code part-name part-desc j183 85801052gy wire copper 1/0.52 tin coating j184 85801052gy wire copper 1/0.52 tin coating j185 85801052gy wire copper 1/0.52 tin coating j186 85801052gy wire copper 1/0.52 tin coating j187 85801052gy wire copper 1/0.52 tin coating j188 85801052gy wire copper ...

  • Page 53

    51 loc part-code part-name part-desc r109 rd-az102j- r carbon film 1/6 1k ohm j r110 rd-4z101j- r carbon film 1/4 100 ohm j r111 rd-az102j- r carbon film 1/6 1k ohm j r202 rd-az393j- r carbon film 1/6 39k ohm j r204 rd-az393j- r carbon film 1/6 39k ohm j r206 rd-az183j- r carbon film 1/6 18k ohm j r...

  • Page 54

    52 loc part-code part-name part-desc r416 rd-4z363j- r carbon film 1/4 36k ohm j r419 rd-az471j- r carbon film 1/6 470 ohm j r421 rd-az243j- r carbon film 1/6 24k ohm j r422 rd-az912j- r carbon film 1/6 9.1k ohm j r501 rd-az122j- r carbon film 1/6 1.2k ohm j r503 rd-az623j- r carbon film 1/6 62k ohm...

  • Page 55

    53 loc part-code part-name part-desc r561 rd-az102j- r carbon film 1/6 1k ohm j r574 rd-az103j- r carbon film 1/6 10k ohm j r575 rd-az103j- r carbon film 1/6 10k ohm j 00001 9979800453 pcb main t1.6*330*246 30020 pcctswg067 pcb crt as cmc-518x bd894 5mbfd3512r emi bead filter bfd 3512 r2 ca801 99707...

  • Page 56

    54 loc part-code part-name part-desc r800 hrft330jca r chip 1/10 33 ohm j 2012 r801 hrft750jca r chip 1/10 75 ohm j 2012 r803 hrft101jca r chip 1/10 100 ohm j 2012 r804 hrft911jca r chip 1/10 910 ohm j 2012 r806 hrft331jca r chip 1/10 330 ohm j 2012 r809 hrft560jca r chip 1/10 56 ohm j 2012 r810 hrf...

  • Page 57

    55 loc part-code part-name part-desc r811 rs02z242j- r m-oxide film 2w 2.4k ohm j (tapping) r812 rs02z242j- r m-oxide film 2w 2.4k ohm j (tapping) r841 rs02z242j- r m-oxide film 2w 2.4k ohm j (tapping) r842 rs02z242j- r m-oxide film 2w 2.4k ohm j (tapping) r871 rs02z242j- r m-oxide film 2w 2.4k ohm ...

  • Page 58

    56 loc part-code part-name part-desc q835 tkta1268gr tr kta1268gr q836 tktc3200y- tr ktc3200y q862 tph2369--- tr ph2369 q863 tbfq221--- tr bfq221 q864 tbfq241--- tr bfq241 q865 tkta1268gr tr kta1268gr q866 tktc3200y- tr ktc3200y 70010 pcctjag067 pcb crt axial as cmc-518x bd890 5pb13857-- coil bead b...

  • Page 59

    57 loc part-code part-name part-desc j811 85801052gy wire copper 1/0.52 tin coating j812 85801052gy wire copper 1/0.52 tin coating j813 85801052gy wire copper 1/0.52 tin coating loc part-code part-name part-desc j814 85801052gy wire copper 1/0.52 tin coating j815 85801052gy wire copper 1/0.52 tin co...

  • Page 60

    58 loc part-code part-name part-desc r868 rd-az470j- r carbon film 1/6 47 ohm j r873 rd-4z220j- r carbon film 1/4 22 ohm j r874 rd-4z220j- r carbon film 1/4 22 ohm j r875 rc-2z470j- r carbon comp 1/2 47 ohm j r877 rd-az104j- r carbon film 1/6 100k ohm j r879 rd-az473j- r carbon film 1/6 47k ohm j r8...

  • Page 61: Ser

    Daewoo electronics co., ltd. 686, ahyeon-dong mapo-gu 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: ser v c e manual o verseas ser vice dept ..