Dell E551C Series Service Manual
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Dell E551C Series Service Manual

Dell E551C Series Service Manual

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SERVICE MANUAL
COLOR MONITOR
E551C SERIES
(D556Q)

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Summary of Contents for Dell E551C Series

  • Page 1 SERVICE MANUAL COLOR MONITOR E551C SERIES (D556Q)
  • Page 2 THESE DOCUMENTS ARE FOR REPAIR SERVICE INFORMATION ONLY. EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL.WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLAIMS LIABILITY FOR CHANGES, ERRORS OR OMISSIONS, MANUFACTURE DATA : MAY.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS PAGE 1. SPECIFICATIONS ..................... 2. PRECAUTION AND NOTICES ................2-1 SAFETY PRECAUTIONS ................2-2 PRODUCT SAFETY NOTICE ............... 2-3 SERVICE NOTES ................... 2-4 HIGH VOLTAGE WARNING ............... 3. OPERATING INSTRUCTIONS ................4. ADJUSTMENT ......................4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS ....... 4-2 MAIN ADJUSTMENTS .................

  • Page 4: Specifications

    1. SPECIFICATIONS FOR D556P COLOR MONITOR 38cm(15V) 90 Deflection, 29mm Neck, 0.28mm Dot Pitch, Non-Glare Screen Viewable image Size: 35cm (13.8") diagonal Display Color: Unlimited Colors External Controls: Power On/Off, UP/Down key, Function key: Contrast, Brightness, H-Size, H-Center, V-Size, V-Center, Pincushion, Trapezoid Input Video Signal Mode 1...
  • Page 5 14. Humidity: 10﹪ to 85﹪ Relative, Non-Condensing Weight: 12.5kg(Net), 14.5kg(Gross) • 16. Dimensions Monitor: 460(W)×425(H)×494(D) ﹪ Carton: 360(W)×364(H)×385(D) ﹪ Monitor: 17. External Connection: 15 Pin D-type Connector AC Power Cord 18. Regulations:UL, CSA, FCC, TÜV/GS, CE , MPR II...

  • Page 6: Precaution And Notices

    2. PRECAUTIONS AND NOTICES SAFETY PRECAUTIONS Observe all caution and safety related notes located inside the display cabinet. Operation of the display with the cover removed, may cause a serious shock hazard from the display power supply. Work on the display should not be attempted by anyone who is not thoroughly familiar with precautions necessary when working on high voltage equipment.

  • Page 7: High Voltage Warning

    HIGH VOLTAGE WARNING Operation of monitor outside of cabinet or with back removed may cause a serious shock hazard. Work on this model should only be performed by those who are thoroughly familiar with precautions necessary when working on high voltage equipment. Exercise care when servicing this chassis with power applied.

  • Page 8: Operating Instructions

    3. OPERATING INSTRUCTIONS This procedure gives you instructions for installing and using the E55lc display. Position the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduit ground.

  • Page 9: Adjustment

    4. ADJUSTMENT 4-1 ADJUSTMENT CONDITIONS AND PRECAUTIONS Approximately 30 minutes should be allowed for warm up before proceeding. Adjustments should be undertaken only on those necessary elements since most of them have been carefully preset at the factory. 4-2 MAIN ADJUSTMENTS FUNCTION LOCATION DESIGNATION...
  • Page 10 D. Full white luminance: (a) Set mode 5 ( 800×600 Fh: 46.8K ) full white pattern. (b) Image size : H:270±4mm, V:202±4mm. (c) Brightness set to raster just cut off and set the contrast to max. (d) Adjust VR701 to make sure white luminance at 113± 2cd/m². 4.

  • Page 11: Circuit Description

    5. CIRCUIT DESCRIPTION 5-1 MICRO CIRCUIT IC101 is CPU, This CPU has the following functions. 1. Detect timing mode by sensing the horizontal frequency, vertical frequency, the polarity of Hor. Sync and Ver. Sync. 2. Key board scan control. 3. Geometry control internal D/A converters and I²C bus control. 4.

  • Page 12: Transistor & Diode Circuit

    5-5 TRANSISTOR & DIODE CIRCUIT LOCATION CIRCUIT FUNCTION DESCRIPTION D901 ~ D904 Bridge Rectifier for AC Source D909 Half-Wave Rectifier for Start CKT D910 Clamp Diode for Snubber CKT D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D925 Rectifier for Output Voltage...

  • Page 13: Trouble Shooting Chart

    6.TROUBLE SHOOTING CHART 6-1 NO RASTER, CRT RELATIVE CIRCUIT PROBLEMS 90V, 12V CHECK MAIN PC BOARD CHECK POWER SAVING CIRCUIT, Q909, Q910 CHECK THE HIGE VOLTAGE OF CRT ABOUT 23.5KV ~ 25KV CHECK FAILSAFE CKT Q402, Q403 RELATIVE CKT. CHECK THE VOLTAGE OF CRT HEATER ABOUT 6.3V CHECK CRT'S HEATER RELATIVE CIRCUIT Q907, Q908...
  • Page 14 2.ABNORMAL VIDEO LEVEL ON SCREEN CHECK THE VOLTAGE OF IC801 PIN 2, 16 ABOUT 8V CHECK 8V RELATIVE CIRCUIT CHECK THE SIGNAL INPUT OF R.G.B. ABOUT 0.7Vpp CHECK SIGNAL CABLE OR INTERFACE CARD. CHECK IC801 PIN 11 ABOUT 10Vpp CHECK THE RELATIVE CIRCUIT OF Q813, Q814 OR CLAMP.

  • Page 15: Abnormal Display

    6-2 ABNORMAL DISPLAY 1.NO SIGNAL ON SCREEN CHECK VIDEO IC VCC ABOUT 8V CHECK THE 12V PIN OF P802 CONNECTOR CHECK THE OUTPUT VOLTAGE OF IC801 PIN 13, 15, 18 ABOUT 3Vpp CHECK THE RELATIVE CIRCUIT OF Q813, Q814 & IC801 CHECK THE B+ VOLTAGE OF VIDEO PCB ABOUT 75V CHECK THE 80V RELATIVE CIRCUIT...

  • Page 16: Blanking

    6-3 NO BLANKING CHECK THE RELATIVE CIRCUIT OF BLANKING CHECK THE RELATIVE CIRCUIT OF Q601 & Q707 ON MAIN PCB CHECK C836, R859 ON VIDEO PCB, CHECK G1 RELATIVE CIRCUIT FBT PIN 5 ON MAIN PCB 6-4 HOR./OSC/DEF/HV CIRCUIT FAULT 1.

  • Page 17: Abnormal Horizontal Deflection

    6-5 ABNORMAL HORIZONTAL DEFLECTION 1. ABNORMAL HORIZONTAL SIZE READJUST H-SIZE FUNCTION CHECK THE RELATIVE CIRCUIT OF Q404, Q405, & Q406 CHECK FBT VOLTAGE ABOUT 90V AT FH=31KHz CHECK THE RELATIVE CIRCUIT OF SMPS. CHECK THE HV OF CRT ABOUT 24.5KV 2.

  • Page 18: Abnormal Vertical Scanning

    6-6 ABNORMAL VERTICAL SCANNING 1. ABNORMAL VERTICAL SIZE READJUST V-SIZE FUNCTION VALUE CHECK THE IC601 ABOUT 11.8V PIN 6 CHECK D601, C606 RELATIVE CIRCUIT CHECK VERT. OSC CIRCUIT CHECK THE VOLTAGE OF IC101 RELATIVE CIRCUIT READJUST V-SIZE FUNCTION VALUE CHECK IC401 PIN 20, 21, 22, 23 RELATIVE CIRCUIT 2.

  • Page 19: Side-Pin Cushion Distortion

    6-7 SIDE-PIN CUSHION DISTORTION READJUST SIDEPIN FUNCTION VALUE CHECK IC401, Q404, Q405, Q406 RELATIVE CKT. 6-8 POOR FOCUS READJUST FOCUS CONTROL CHECK FOCUS CONTROL UNIT, FOCUS LEAD WIRE, CRT SOCKET & CRT...

  • Page 20: Power Supply Trouble Shooting Chart

    6-9 POWER SUPPLY TROUBLE SHOOTING CHART BEFORE CHECK SW.REG. PLEASE REFER TO THE POWER SUPPLY BLOCK DIAGRAM POWER SUPPLY OUTPUT: (A) VARIABLE OUTPUT : 88V - 160V EPENDING UPON H.SYNC FREQUENCY) CONSTANT OUTPUT : 6.3V, 15V, -12V, 75V BEAD SET ABNORMAL VARIABLE OUTPUT MAKE SURE THAT CHECK AC LINE...

  • Page 21: Mechanical Of Cabinet Front Dis-Assembly

    8. MECHANICAL OF CABINET FRONT DIS-ASSEMBLY...

  • Page 22: Parts Listing

    PARTS LIST OF CABINET LOCATION D556QFCDDLD SPECIFICATION (LOW RADIATION 220V) CMC556Q CHAS ASS'Y 503- SCREW RUBBER WASHER PALLET TERMINAL LUG 6015 CRT SUPPORT 403- BUMPER STEEL 33A 3712- A.B.S. PLASTIC 33A 3675- FUNC LED LENS 33A 3731- KEY PAD 646- 370 - FRONT PANEL CRT WARNING LABEL FOR MOP...
  • Page 23 Q403 ASS'Y 705A 556Q- C87 - AC INLET INALWAYS CN901 705A 556Q- C56 - IC904 ASS'Y 750A 5910- 15” CPT CRT D556Q DELL 750A 5910- 15” CPT CRT D556Q DELL 750A 5932- 15” PHILIPS D556Q DELL (GND2) 205- 30 -...
  • Page 24 C603 309- 471 - 470UF +-20% 16V C606 309- 102 - 0.1uF +80-20% 50V Y5V C609 450- 104 - 1000uF +-20% 16V C713 309- 220 - 22uF +-20% 200V C714 305- 331 - 330uF +-20% 16V C900 65A 305M- 472 - 4700PF +-20% 400VAC/250VAC C900 65A 305M-...
  • Page 25 L404 253- 1.5MH +-5% 0.4A L404 253- 1.5MH +-5% 0.4A L405 253- 68 - 180UH +-10% L405 253- 68 - 180UH +-10% L405 253- 68 - CHOKE COIL L901 174- 25MH FILTER L901 174- LINE FILTER L901 174- 25MH LINE FILTER L901 174- 25MH FILTER...
  • Page 26 SW901 267- 12 - PWR SW 5A/250V SW901 267- 12 - POWER SWITCH SW901 267- 12 - PUSH-PUSH SEITCH(TV-5) SW901 267- 12 - POWER SWITCH T401 167- 71B - DRIVER X'FMR T402 T402 14” FBT T901 80A 356T T901 80A 356T X’FMR D356PT BY LI TAI TP901 211-...
  • Page 27 C445 TIN COATED C446 444- 101 - 100 PF 10% 50V Z5P C447 45G- 102 - 0.001UF 100V +-2% C448 64A 176J- 823 - 0.082UF +-5% 50/63V C448 64A 176J- 823 - 0.082uF +-5% 100V C460 450- 333 - 0.033uF +-5% 50V C463 44J- 103 -...
  • Page 28 D103 11 - DIODE IN4148 D104 11 - DIODE IN4148 D105 11 - DIODE IN4148 D125 11 - DIODE IN4148 D126 11 - DIODE IN4148 D127 TIN COATED D160 11 - DIODE IN4148 D402 11 - DIODE IN4148 D403 93A 1002- 1N5817 D403 93A 1002-...
  • Page 29 D926 11 - DIODE IN4148 D927 11 - DIODE IN4148 D928 11 - DIODE IN4148 D929 47P - 1N4004 D929 47T - 1N4004 D930 93A 1040- UF4004 D930 93A 1040- 501 - GUF10G D939 11 - DIODE IN4148 D984 11 - DIODE IN4148 D995 11 -...
  • Page 30 J051 TIN COATED J052 TIN COATED J053 TIN COATED J054 TIN COATED J058 TIN COATED LOCATION CMP556QAI SPECIFICATION J059 TIN COATED J061 TIN COATED J063 TIN COATED J064 TIN COATED J065 TIN COATED J066 TIN COATED J067 TIN COATED J068 TIN COATED J069 TIN COATED...
  • Page 31 J134 TIN COATED L101 339 - 3.3UH +-10% L402 TIN COATED L403 TIN COATED L406 TIN COATED L907 TIN COATED Q101 446- 2SC1213AC LOCATION SPECIFICATION CMP556QAI Q401 419- TRAN 2SC945P/NEC TAPING Q401 419- SG - KSC945C-G TA FAIRCHILD Q404 420- TRAN 2SA733P/NEC TAPING Q404 420-...
  • Page 32 R119 602- 103 - 10K OHM +-5% 1/6W R122 172- 221 - 220 OHM +-5% 1/4W R123 602- 472 - 4.7K OHM +-5% 1/4W R124 602- 332 - 3.3K OHM +-5% 1/4W R126 172- 202 - 2K OHM +-5% 1/4W R132 602- 101 -...
  • Page 33 R460 172- 472 - 4.7K OHM +-5% 1/4W R462 602- 243 - 24K OHM +-5% 1/6W R471 602- 563 - 56K OHM +-5% 1/6W R497 210- 242 - 2.4K OHM +-5% 1/6W R601 172- 243 - 24K OHM +-5% 1/4W R602 172- 392 -...
  • Page 34 R940 172- 393 - 39K OHM +-2% 1/4W R941 172- 152 - 1.5K OHM +-5% 1/4W R942 172- 680 - 68 OHM +-5% 1/4W R950 602- 243 - 24K OHM +-5% 1/6W R951 172- 100 - 10 OHM +-5% 1/4W R952 172- 473 -...
  • Page 35 C835 103 - 0.01UF +80% -20% 2K Z5V C837 305- 470 - 47UF 160V GND1 203- BRASS PIN IC801 539- LM1279N J806 26 - FERRITE BEAD K5B RH 3.5 J806 26 - FERRITE BEAD 202- 59 - HOOK UP WIRE P801 33A 3278- 11P PLUG...

  • Page 36: Block Diagram (Deflection)

    C820 44J- 104 - 0.1UF +-5% 100V PEI C820 65A 176J- 104 - 0.1UF +-5% 100V C828 478 - 0.47uF 100V NP C829 478 - 0.47uF 100V NP C830 478 - 0.47uF 100V NP C831 64A 176J- 104 - 0.1uF +-5% 100V C832 64A 176J- 104 -...
  • Page 37 J801 TIN COATED J802 TIN COATED J803 TIN COATED J804 TIN COATED J805 TIN COATED LOCATION 556Q SPECIFICATION J807 TIN COATED J808 TIN COATED J809 TIN COATED J810 TIN COATED J818 TIN COATED J819 TIN COATED J820 TIN COATED L801 479 - 4.7UH L805...
  • Page 38 R858 TIN COATED R861 602- 822 - 8.2K OHM +-5% 1/6W R862 602- 222 - 2.2K OHM +-5% 1/6W R863 TIN COATED R864 61A 175L- 471 - 470 OHM +-5% 1/2W ZD801 57 - RD8.2EB3/NEC. 8.07~8.41V ZD801 519 - TZX8V2B ZD801 57M - MTZJ8.2B...
  • Page 39 PARTS LIST OF IC802 ASS'Y LOCATION PARTS No. SPECIFICATION 200- SILICONE RUBBER 355- HEAT SINK M1A 1730- SCREW IC802 551- LM2438T PARTS LIST OF IC101 CPU ASS'Y LOCATION PARTS No. SPECIFICATION IC101 56A 1125- NT6861B-08066 PARTS LIST OF AC LINET ASS'Y LOCATION PARTS No.
  • Page 40 PARTS LIST OF Q911 ASS'Y LOCATION PARTS No. SPECIFICATION NYLON WASHER 32A 3028- MICA 200- SILICONE RUBBER 315- HEAT SINK M1A 1730- SCREW M3x10 Q911 600- MOS FET IRF634A PARTS LIST OF IC904 ASS'Y LOCATION PARTS No. SPECIFICATION 200- SILICONE RUBBER 315- HEAT SINK M1A 1730-...
  • Page 41 LOCATION PARTS No. SPECIFICATION 750A 5910- 5PS - 15” CHUNGHWA .28 CRT C414 64A 176J- 104 - 0.1UF 5% 100V C418 63A 210J- 432 - 4.3Nf/2kv =-5% C419 63A 210J- 682 - 6800P/1600V C422 64A 100J- 225 - 2.2UF/100V MEF C425 63A 210J- 244 -...
  • Page 42 C425 63A 210J- 244 - 0.24UF 400V PMH BY MYLAR C430 152 - 1500PF 10% Z5F 1KV P404 33A 8009- 3P PLUG R409 172- 204 - 200K OHM 5% 1/4W R456 61A 153M- 391 - 390 OHM +-5% 3W R461 TIN COATED R470 602-...

  • Page 43: Block Diagram (Deflection)

    9. BLOCK DIAGRAM (DEFLECTION)

  • Page 44: Block Diagram (Smps)

    9-1. BLOCK DIAGRAM (SMPS)

  • Page 45: Ic Block Diagrams

    10. IC BLOCK DIAGRAMS IC101 UM6861/WT6018 DEGAUSS V-I/P BRIGHT H-I/P CONTRAST RESET_ IC802 OSC0 OFF MODE LM2439 OSC1 H-OUT Vin 1 V-OUT Vin 2 Vin 3 Vout 3 WRITE PROTECT MUTE Vout 2 STAND BY/SUSPEND Vout 1 H.W DDC SENSE AUDIO KEY SELECT LED DETECT...
  • Page 46 IC102 24C04 HV GENERATOR MEMORY EEPROM ARRAY CONTROL CONTROL (128X8) LOGIC LOGIC XDEC PAGE LATCHES YDEC SENSE AMP R.W CONTROL IC601 TDA9302H FLYBACK GENERATOR POWER AMPLITIER THERMAL PROTECTION...
  • Page 47 IC901 3842 SET/ Vref Vref RESET U.V.L.O. INTERNAL LOGLC BIAS 1/2 Vref C.S. COMP COMP. LATCH OSCILLATOR Ct/Rt...

  • Page 49: Pcb Layout

    11 PCB LAYOUT 11-1 MAIN PCB LAYOUT...
  • Page 50 11-2 CRT BOARD LAYOUT RESERVE FOR CRT BOARD LAYOUT PICURE...

  • Page 51: Schematic Diagram

    12 SCHEMATIC DIAGRAM CMPC-E551c 715A767-X CRPC-E551c 715A723-X D814 H802 C821 CN903 C820 93A64-19-52T 10UF ROTATION COIL 1SS83 IC801 250V R801 C810 100V C811 47UF 56A539-2 R-BIAS P801 C812 C813 R849 R900 LM1279 1000UF 0.22 VR803 I/4W 1/4W R111 C841 R-OSD G-OSD IC802 1000P...

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