1. DL manuals
  2. Daewoo
  3. Monitor
  4. 529B
  5. Service Manual

Daewoo 529B Service Manual

Manual is about: XGA COLOR MONITOR

Summary of 529B

  • Page 1

    Service manual xga color monitor model : 529b 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 13 troubleshooting hints 15 block diagram 29 pcb layout 30 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. The normal operating voltage for this pro...

  • 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 e...

  • Page 9: General Information

    Adj adjustment afc automatic frequency control crt cathode ray tube def deflection d.Y deflection yoke fbt flyback transformer h.Sync horizontal synchronization osc oscillator p.S.U power supply unit pwa printed circuit board wiring assembly r.G.B red, green, blue v.Sync vertical synchronization 7 g...

  • Page 10: Pin Connector

    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 11 gnd - v.Sync 12 bi-directional data (sda) 13 horizontal sync 14 vertical sync (vclk) 15 data clock (scl) 8 • degaussing is always required when adjusting purity or convergence. • the white b...

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

  • Page 13

    11 osd functions adjust the parallelogram when the screen is leaning left or right. Adjust the rotation when the screen is tilted left or right. Adjust the pin corner top when the top sides of the screen are bowed. Rotation pin corner top parallelogram adjust the trapezoid of the screen by moving th...

  • Page 14

    12 select language for osd (5 languages). Language icon control functions reset the screen to the factory preset display settings. Recall.

  • Page 15: Alignment Procedure

    13 ◆ 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/composite deflection frequency horizontal frequency :...

  • Page 16

    14 (h) set the brightness control to the center and adjust the sub contrast control to get the screen luminosity from 33ft/l. (i) 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 co...

  • Page 17: Troubleshooting Hints

    15 troubleshooting hints 1. No character are the contrast & brightness controls 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 ic801 (pin 5,7,9) and their ambient circuit trouble i...

  • Page 18

    16 2. No raster trouble in power supply 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 no yes yes yes yes no is...

  • Page 19

    17 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 14,16,19 all normal? Check video signal cable or video card trouble in ic801 ...

  • Page 20

    18 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 13, 14, 15) 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 21

    19 5. Horizontal output circuit is b+ line voltage normal? Is q505 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 q501 and its ambient circuit trouble in q501, t501 if the holddown cir...

  • Page 22

    20 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 ic201 and its ambient circuit no no no yes yes is the input h.Sync correct? Check ic201 and its ambient circ...

  • Page 23

    21 6-2. Vertical unstable picture is the 12vdc line voltage 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 circu...

  • Page 24

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

  • Page 25

    23 8. Convergence is convergence on the center area bad? Is convergence on the fringe area bad? Adjust static convergence refer to adjustment procedure for convergence yes adjust d.Y location yes no poor convergence.

  • Page 26

    24 9. Abnormal picture 9-1. Horizontal size * at first, adjust controls in the osd menu trouble in l503, c543 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...

  • Page 27

    25 9-2. Vertical size is the dc voltage with ic501 pin 12,13 changeable? Check the ic501 and its ambient circuit no trouble in vertical output circuit refer to vertical output circuit yes abnormal v.Size is the dc voltage with ic401 pin 4,6 changeable? Yes.

  • Page 28

    26 10. Side-pincushion circuit check the q515, q517 and its ambient circuit yes side-pincusion distortion is excessive or barrel o.K select the side-pincushion icon in osd menu, and adjust to acceptable position. Yes is the waveform of ic501 (pin 11) correct? No no trouble in h.V sync.

  • Page 29

    27 11. Power supply unit (p.S.U) is the ic001 o.K? Replace ic002 no is voltage of c104 set at 65vdc? No is voltage of t001 pin 8 130v (270v)? Trouble in switching power transformer t001 or ic001 and its ambient circuit trouble in bridge diode d001 or peripheral device no is the waveform t001 pin 5 c...

  • Page 30

    28 is voltage of ic102 pin 3 set at 5vdc? Trouble in ic102, d103 no is voltage of c108 set at 22vdc? No yes yes yes is voltage of ic103 pin 3 set at 12vdc? Trouble in d106, q103 or ic103 p.S.U o.K trouble in d104, t001 no a.

  • Page 31: Block Diagram

    29 block diagram r/g/ b bia hs-in vs-in sda scl g-osd f-blk r-osd b-osd r/g gain clamp contrast g1 focus -130v screen r/g/b abl high voltage +65v +185v +22v +15v +8v sc l1 hs-o vs-o brightness contrast mute sda 1 signal in video pre amp. Ka2143b video out & bias bfq225, ph2369, bfq221, bfq241 cd t m...

  • Page 32

    30 pcb layout main pcb component side.

  • Page 33

    31 main pcb solder side.

  • Page 34

    32 crt pcb component side crt pcb solder side.

  • Page 35

    33 schematic diagram power & connection section.

  • Page 36

    34 control & vertical out section.

  • Page 37

    35 horizontal section.

  • Page 38

    36 video section.

  • Page 39

    37 exploded view & mechanical parts list.

  • Page 40

    Resistor description example: capacitor description example: fig & part no description index capacitors c102 ccxf1h104z ceramic 50v 0.1µf z c402 ccxb1h331k ceramic 50v 22pf k c105 cmxm 2a224j mylar 100v 0.22µf j allowance c ± 0.25pf d ± 0.5% f ± 1pf j ± 5% k ± 10% p ± 100% ~ 0% z ± 80% ~ – fig & par...

  • Page 41: Electrical Parts List

    C216 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c217 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c220 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c221 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c223 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c224 cexf1c101v c electro 16v rss 100mf (6.3x11) tp c22...

  • Page 42

    C892 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c893 cexf1c221v c electro 16v rss 220mf (8x11.5) tp c895 cmxm2a103j c mylar 100v 0.01mf j (tp) c896 ccxb2h102k c cera 500v b 1000pf k (tapping) c897 hcfk104zca c chip cera 50v y5v 0.1mf z 2012 c898 ccxe3d103p c cera hike 2kv 0.01mf p c899 cexf1c470v c...

  • Page 43

    Ic501 1tda4856-- ic h.Osc tda4856 ic801 1ka2143b-- ic video preamp ka2143b l501 5cpz568k03 coil peaking 0.56uh k (axial 7mm) l502 5mh0000064 coil h-linearity trl-523x l503 5mc0000073 coil choke ch-120a l504 5mc0000061 coil choke tch-12a l801 5cpz229k03 coil peaking 2.2uh k (axial 7mm) l802 5cpz478k0...

  • Page 44

    R223 hrft101jca r chip 1/10 100 ohm j 2012 r224 hrft202jca r chip 1/10 2k ohm j 2012 r225 hrft101jca r chip 1/10 100 ohm j 2012 r226 hrft202jca r chip 1/10 2k ohm j 2012 r227 hrft202jca r chip 1/10 2k ohm j 2012 r228 rd-az183j- r carbon film 1/6 18k ohm j r229 hrft202jca r chip 1/10 2k ohm j 2012 r2...

  • Page 45

    R580 rd-az824j- r carbon film 1/6 820k ohm j r581 rd-4z153j- r carbon film 1/4 15k ohm j r582 rd-az154j- r carbon film 1/6 150k ohm j r583 rd-az363j- r carbon film 1/6 36k ohm j r590 rd-az753j- r carbon film 1/6 75k ohm j r591 hrft683jca r chip 1/10 68k ohm j 2012 r592 hrft683jca r chip 1/10 68k ohm...

  • Page 46

    R893 rs01z220j- r m-oxide film 1w 22 ohm j (tapping) r894 rs01z100j- r m-oxide film 1w 10 ohm j (tapping) r895 hrft124jca r chip 1/10 120k ohm j 2012 rl001 5sc0101005 sw relay hr-cr313 dc12v 1c-1p rl501 5sc0201103 sw relay hr-cr323 2c-1p dc12v sc001 9970800023 cable signal as 15p+4c/ddc=1.5m(gy275a)...

  • Page 47: Serv

    Serv ce 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: aug...