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Compaq CPQ-C1786FNSL Service Manual

17-inch color monitor.
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Service Manual
17-inch Color Monitor
CPQ-C1786FNSL/T
(FS7550/V7550)

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   Summary of Contents for Compaq CPQ-C1786FNSL

  • Page 1 Service Manual 17-inch Color Monitor CPQ-C1786FNSL/T (FS7550/V7550)
  • Page 2 Service Manual Versions and Revision N o. Ve rs ion R e le as e D ate R e vis ion Copyright Trademarks...
  • Page 3 CPQ-C1786FNSL/T (FS7550/V7550) Table of Contents...
  • Page 4: Safety Precautions

    CPQ-C1786FNSL/T (FS7550/V7550) 1 Precautions 1-1 Safety Precautions 1-1-1 Warnings To ex pos ed m e ta l To kn ow n ca bin et p art ea rth g ro un d 0.15 ufd 1500 ohm 10 w att 1-1-2 Safety Checks...
  • Page 5 CPQ-C1786FNSL/T (FS7550/V7550) 1-1-3 Product Safety Notices 1-2 Servicing Precautions Warning: Caution: Note: MUST BE 1-3 Hi-Pot Test Precautions...
  • Page 6: Ground Continuity Test

    CPQ-C1786FNSL/T (FS7550/V7550) 1-4 Ground Continuity Test Precautions...
  • Page 7: Product Specifications

    CPQ-C1786FNSL/T (FS7550/V7550) 2 Product Specifications 2-1 Specifications Product Specifications...
  • Page 8 CPQ-C1786FNSL/T (FS7550/V7550) 2-2 Signal Cable Pin Connections S ig na l S ig na l Note * Product Specifications...
  • Page 9: Timing Chart

    CPQ-C1786FNSL/T (FS7550/V7550) 2-3 Timing Chart M ode H. D ots V. D ots H-fre q (kHz) Sync Polarity A pe riod us B B lanking us C Sync us D B .P. us E Active us F F.P. us V-fre q (Hz)
  • Page 10 CPQ-C1786FNSL/T (FS7550/V7550) 2-4 Power Saving Function Note: S ta te Po we r Co ns umptio n Lig ht 2-5 TCO Version Product Specifications...
  • Page 11 CPQ-C1786FNSL/T (FS7550/V7550) 2-5-1 TCO 95 Version (Optional) 2-5-2 TCO 99 Version Product Specifications...
  • Page 12: Control Location And Functions

    CPQ-C1786FNSL/T (FS7550/V7550) 3 Control Location and Functions 3-1 Front Panel Power LED MENU Key - Key + Key Power Button 3-2 Front Panel Keys Functions 3-3 Adjustment Procedure...
  • Page 13: Operation Theory

    CPQ-C1786FNSL/T (FS7550/V7550) 4 Operation Theory 4-1 Main Features 4-2 Microcontrol Section Operation Theory...
  • Page 14 CPQ-C1786FNSL/T (FS7550/V7550) 4-3 Deflection Section 4-3-1 Horizontal Section 4-3-2 Vertical Section 4-3-3 Vertical O/P section 4-3-4 E-W/Trapezoid and H. Width Controls 4-3-5 X-Ray Protection Operation Theory...
  • Page 15 CPQ-C1786FNSL/T (FS7550/V7550) 4-3-6 G1, Blanking and Brightness 4-3-7 Contrast Section 4-3-8 H/V size breathing compensation 4-3-9 Dynamic focus circuitry 4-4 Power Supply Section 4-4-1 AC Rectifier 4-4-2 Line Filter 4-4-3 Power LED Status Operation Theory...
  • Page 16 CPQ-C1786FNSL/T (FS7550/V7550) 4-4-4 Auto Degaussing 4-4-5 PWM Control 4-4-6 Synchronization 4-4-7 O.V.P. 4-4-8 O.P.P. 4-4-9 Step Up Power Supply For FBT Operation Theory...
  • Page 17 CPQ-C1786FNSL/T (FS7550/V7550) 4-5 Video Amplifier Section 4-6 OSD (On Screen Display) Circuit Operation Theory...
  • Page 18: Alignments And Adjustments

    CPQ-C1786FNSL/T (FS7550/V7550) 5 Alignments and Adjustments 5-1 General Adjustments 5-1-1 Adjustment Conditions 5-1-2 Equipment Required 5-1-3 Switching Power Supply and Regulator Adjustment Alignments and Adjustments...
  • Page 19 CPQ-C1786FNSL/T (FS7550/V7550) 5-2 Alignment Procedures 5-2-1 High Voltage Adjustment CONDITION PROCEDURE 5-2-2 Screen and White Balance Adjustment CONDITION PROCEDURE CONDITION PROCEDURE Alignments and Adjustments...
  • Page 20 CPQ-C1786FNSL/T (FS7550/V7550) CONDITION 5-2-3 Focus Adjustment CONDITION PROCEDURE 5-2-4 Static Convergence Adjustments CONDITION PROCEDURE C R T 1) Setup Bolt 2) Bow Magnet 3) Band 4) 2-Pole Magnet F R O N T 5) Spacer 6) 4-Pole Magnet 7) Spacer...
  • Page 21 CPQ-C1786FNSL/T (FS7550/V7550) Red/ Blue Blue G reen Red/ Blue Blue Green 4-pole m agnets 6-pole m agnets m ovem ent m ovem ent 5-2-5 Degaussing 5-2-6 Manual Degaussing Alignments and Adjustments...
  • Page 22: Troubleshooting

    CPQ-C1786FNSL/T (FS7550/V7550) 6 Troubleshooting 6-1 No Raster No Raster Measure voltage of B+ at T402 pin 2 on PWB-MAIN Normal High (56 V, 31.5 kHz) (75 V or more) Check voltage of Check I401, cathode, heater, I703, R719, C741, Short Circuit Grid 1, Grid 2, etc.
  • Page 23 CPQ-C1786FNSL/T (FS7550/V7550) 6-2 OSD Abnormal OSD Abnormal Check I502 pin 9, 4 Put on is 5V and pin 5, 10, 7, 8 I502 missing? Check R517, L514, R527, R523, R524 Replace them Check P502 Replace it Replace I502 Troubleshooting...
  • Page 24 CPQ-C1786FNSL/T (FS7550/V7550) 6-3 Function Key Abnormal Function Key Abnormal Put on Check I701 and I701, I703 I703 missing? Power ON/OFF again and Replace X701 check X701, oscillator Check Replace I703 or do I703 EEPROM content ATE again Replace I701 and check...
  • Page 25 CPQ-C1786FNSL/T (FS7550/V7550) 6-4 No Vertical Scan (Raster is one horizontal line) No Vertical Scan Check I301 voltage of Ckeck or replace pin 1 is 12V, pin 4 is I301. -11V, pin 2 is 40V? Check Check R312, R307, pin 5 O/P waveform at...
  • Page 26 CPQ-C1786FNSL/T (FS7550/V7550) 6-5 Out of Horizontal Synchronization Out of Horizontal Synchronization Check or replace Horizontal the signal cable or sync present at H. sync pin 41 pin 15 of I401 of I701. Check I401 pin 8 H. output Check or replace frequency &...
  • Page 27 CPQ-C1786FNSL/T (FS7550/V7550) 6-7 R.G.B. Video Amplifier Abnormal RGB Video AMP Abnormal Check Check or replace the waveform at I501 pin 5, 6 and signal cable or I501 Check waveform at I501 Replace I501 pin 18, pin 19 and pin 20.
  • Page 28 CPQ-C1786FNSL/T (FS7550/V7550) 6-8 Blank EEPROM Trouble-shooting: Description of functions for models under C1786 series EEPROM DATA AUTO-RELOAD Troubleshooting...
  • Page 29: Recommended Parts List

    CPQ-C1786FNSL/T (FS7550/V7550) 7 Recommended Parts List Location Part Number Description Recommended Spare Parts List...
  • Page 30 CPQ-C1786FNSL/T (FS7550/V7550) Location Part Number Description Recommended Spare Parts List...
  • Page 31: Block Diagram

    CPQ-C1786FNSL/T (FS7550/V7550) 8 Block Diagram R DAC P501 G DAC B DAC LM2479 R, G, B I502 I501 BUFFER Video AMP PRE AMP & LM2467 LM1267 RESTORE R G B SW 5 V 11.6V MTV021 P503 P502 BLANKING BRIGHTNESS CONTROL &...
  • Page 32 LITE-ON TECHNOLOGY CORP. 5 F, No. 16, Sec. 4, Nanking E. Road, Taipei, Taiwan Tel: 886-2-25706999 Fax: 886-2-25706888 URL:// www.liteontc.com.tw Printed in Taiwan...

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