LiteOn C1770NSL Service Manual
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LiteOn C1770NSL Service Manual

LiteOn C1770NSL Service Manual

17-inch color monitor
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Service Manual
17-inch Color Monitor
C1770NSL/T

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Summary of Contents for LiteOn C1770NSL

  • Page 1 Service Manual 17-inch Color Monitor C1770NSL/T...
  • Page 2 5- 8 Blank EEPRO M Trouble- shooting Copyright Trademarks Copyright 2001 LiteOn Technology Corp. LiteOn is a registered trademark of LiteOn Technology Corp. All Rights Reserved All other trademarks are the property of their This manual may not, in whole or in part, be respective owners.
  • Page 3 C1770NSL/T Table of Contents...
  • Page 4 C1770NSL/T 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 C1770NSL/T 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

    C1770NSL/T 1-4 Ground Continuity Test Precautions...

  • Page 7: Product Specifications

    C1770NSL/T 2 Product Specifications 2-1 Specifications Product Specifications...
  • Page 8 C1770NSL/T 2-2 Signal Cable Pin Connections Sig na l S ig na l Note * Product Specifications...

  • Page 9: Timing Chart

    C1770NSL/T 2-3 Timing Chart M o de H. D o ts V. D o ts H-fre q (k Hz) S y nc Po la rity A pe rio d us B B la nk ing us C S y nc us D B .P.
  • Page 10 C1770NSL/T 2-4 Display Power Management Signal (DPMS) Note: S ta te LED Co lo r H-S y nc V-S y nc Po we r Co ns umptio n 2-5 TCO Version (Optional) Product Specifications...
  • Page 11 C1770NSL/T 2-5-1 TCO 95 Version (Optional) 2-5-2 TCO 99 Version (Optional) Product Specifications...

  • Page 12: Operation Theory

    C1770NSL/T 3 Operation Theory 3-1 Main Features 3-2 Microcontrol Section 3-3 Deflection Section Operation Theory...
  • Page 13 C1770NSL/T 3-3-1 Horizontal Section 3-3-2 Vertical Section 3-3-3 Vertical O/P section 3-3-4 E-W/Trapezoid and H. Width Controls 3-3-5 X-Ray Protection 3-3-6 G1, Blanking and Brightness 3-3-7 Contrast Section Operation Theory...
  • Page 14 C1770NSL/T 3-3-8 H/V size breathing compensation 3-3-9 Dynamic focus circuitry 3-4 Power Supply Section 3-4-1 AC Rectifier 3-4-2 Line Filter 3-4-3 Power LED Status 3-4-4 Auto Degaussing 3-4-5 PWM Control Operation Theory...
  • Page 15 C1770NSL/T 3-4-6 Synchronization 3-4-7 O.V.P. 3-4-8 O.P.P. 3-4-9 Step Up Power Supply For FBT 3-5 Video Amplifier Section Operation Theory...
  • Page 16 C1770NSL/T 3-6 OSD (On Screen Display) Circuit Operation Theory...

  • Page 17: Alignments And Adjustments

    C1770NSL/T 4 Alignments and Adjustments 4-1 General Adjustments 4-1-1 Adjustment Conditions 4-1-2 Equipment Required 4-1-3 Switching Power Supply and Regulator Adjustment Alignments and Adjustments...
  • Page 18 C1770NSL/T 4-2 Alignment Procedures 4-2-1 High Voltage Adjustment CONDITION PROCEDURE 4-2-2 Screen and White Balance Adjustment CONDITION PROCEDURE CONDITION PROCEDURE Alignments and Adjustments...
  • Page 19 C1770NSL/T CONDITION 4-2-3 Focus Adjustment CONDITION PROCEDURE 4-2-4 Static Convergence Adjustments CONDITION PROCEDURE C R T F R O N T 8 7 6 5 4 3 1) Setup Bolt 2) Bow Magnet 3) Band 4) 2-Pole Magnet 5) Spacer...
  • Page 20 C1770NSL/T Red/ Blue Blue G reen Red/ Blue Blue Green 4-pole m agnets 6-pole m agnets m ovem ent m ovem ent 4-2-5 Degaussing 4-2-6 Manual Degaussing Alignments and Adjustments...

  • Page 21: Troubleshooting

    C1770NSL/T 5 Troubleshooting 5-1 No Raster No Raster Measure voltage of B+ at T402 pin 2 on PWB-MAIN Normal High (68 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 22 C1770NSL/T 5-2 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 23 C1770NSL/T 5-3 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 24 C1770NSL/T 5-4 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. -12V, pin 2 is 35V? Check Check R312, R307, pin 5 O/P waveform at...
  • Page 25 C1770NSL/T 5-5 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 26 C1770NSL/T 5-7 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 I502 pin 1, 2 and 3 collector Check I901 voltage (normally about 70V) &...

  • Page 27: Recommended Parts List

    C1770NSL/T 6 Recommended Parts List Location Part Number Description Recommended Spare Parts List...
  • Page 28 C1770NSL/T Location Part Numbe r De scription Recommended Spare Parts List...

  • Page 29: Block Diagram

    C1770NSL/T 7 Block Diagram R DAC P501 G DAC B DAC LM2479 R, G, B I502 I501 BUFFER Video AMP PRE AMP & LM2469 LM1267 RESTORE R G B SW 5 V 11.6V MTV021 P503 P502 BLANKING BRIGHTNESS CONTROL &...
  • Page 36 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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