Medion B1770NSL Service Manual
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Medion B1770NSL Service Manual

Medion B1770NSL Service Manual

17-inch color monitor
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MEDION
Service Manual
17-inch Color Monitor
B1770NSL/T (MD1772LB)

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Summary of Contents for Medion B1770NSL

  • Page 1 MEDION Service Manual 17-inch Color Monitor B1770NSL/T (MD1772LB)
  • Page 2 This manual may not, in whole or in part, be respective owners. copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. B1770NSL/NST(99) MD1772LB Service Manual. Printed in Taiwan.

  • Page 3: Table Of Contents

    MEDION MD 1772LB (B1770NSL/T) Table of Contents 1. Precautions......................2 2. Product Specifications ..................5 Control Location and Functions ..............10 4. Operation Theory....................11 5. Alignments and Adjustments ................16 6. Troubleshooting ....................21 7. Recommended Spare Parts List ............... 27 8.

  • Page 4: Precautions

    MEDION MD 1772LB (B1770NSL/T) 1 Precautions Follow these safety and servicing precautions to prevent damage and to protect against potential hazards such as electrical shock and X-rays. nonmetallic control knobs, insulating materials, 1-1 Safety Precautions cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacitor networks, mechanical insulators, etc.

  • Page 5: Servicing Precautions

    MEDION MD 1772LB (B1770NSL/T) 1-1-3 Product Safety Notices Many electrical and mechanical parts in this chassis have special safety-related characteristics which are often not evident from visual inspection, the protection afforded by them may not be obtained by replacing them with components rated for higher voltage, wattage, etc.
  • Page 6 MEDION MD 1772LB (B1770NSL/T) d) Plug monitor power cord to the Hi Pot tester terminals. e) Turn on tester and watch the indicator or beeper. f) If the indicator lamp lighten, or beeper beeps, the test fails. 1-4 Ground Continuity Test 1.

  • Page 7: Product Specifications

    MEDION MD 1772LB (B1770NSL/T) 2 Product Specifications 2-1 Specifications 1 7 - i nc h ( 1 5 . 8 - i nc h Vi s ua l i ma ge a r e a) , s l o te d ma s k, 9 0...
  • Page 8 MEDION MD 1772LB (B1770NSL/T) 2-2 Signal Cable Pin Connections Table 2-1. Signal Cable Pin Assignment Signal Signal Red vi de o Gr een vi deo Di gi tal Gr ound Bl ue vi de o Gr ound Gr ound H- Sync...

  • Page 9: Timing Chart

    MEDION MD 1772LB (B1770NSL/T) 2-3 Timing Chart This section describes the timings that the computer industry recognizes as standard for computer-generated video signals. Table 2-2. Timing Chart M ode H. Dots 1024 1024 1024 1280 1024 V. Dots 1024 H-fre q (kHz) 31.47...
  • Page 10 MEDION MD 1772LB (B1770NSL/T) 2-4 Display Power Management Signal (DPMS) Note: These power-saving states exceed the Environmental Protection Agency (EPA) Energy Star requirements and the Video Electronics Standard Association (VESA) for Display Power Management Signal (DPMS) . Table 2-3. Display Power Management Signal (DPMS)
  • Page 11 MEDION MD 1772LB (B1770NSL/T) 2-6-2 TCO 95 Version (Optional) The TCO 95 scheme is for international and environmental labelling of personal computers. The labelling scheme was developed as a joint effort by the TCO (The Swedish Confederation of Professional Employ ees), Naturskyddsforeningen (The Swedish Society for Nature Conservation) and NUTEK (The National Board for Industry and Technical Development in Sweden).

  • Page 12: Control Location And Functions

    MEDION MD 1772LB (B1770NSL/T) 3 Control Location and Functions (1) Function Key (2) Decrease Key (3) Increase Key (4) Select Key (5) Power LED (6) Power ON/OFF 3-1 Front Panel 3-2 Front Panel Keys Functions 1. Function Key: Display the main menu, and exit the adjustment screen and save adjustments.

  • Page 13: Operation Theory

    MEDION MD 1772LB (B1770NSL/T) 4 Operation Theory This is a fully digital controlled multi-sync color monitor that is compliant with DDC1/2B Plug and Play VESA standard and offers the following main features. 4-1 Main Features 1. Simplified design with minimum components.
  • Page 14 MEDION MD 1772LB (B1770NSL/T) 4-3-1 Horizontal Section 1. The oscillator is driven by the currents in R467 and R468. The minimum oscillator frequency is determined by R467 and the maximum frequency is determined by R468. 2. Horizontal sync goes into pin 15 through R494. And horizontal flyback pulse goes into pin 1 through R479 and bypass filter C446 from Emitter of Q403 and C406, C407, C461, R407, D432, R404, R402 for AFC loop.
  • Page 15 MEDION MD 1772LB (B1770NSL/T) 4-3-7 Contrast Section 1. Contrast is controlled by I701 through I C bus to I501 (TDA4886) directly. 2. Beam current is detected through T402 (FBT) pin 7, C432, Q418, VR402, R453, Q419 and detected voltage feeding into R510, R509, R507,C523 to control I501 pin 24 voltage. When I501 pin 24 voltage drops below 5V, the ABL function will happen.
  • Page 16 MEDION MD 1772LB (B1770NSL/T) 2. Regulation The DC O/P voltage is proportional to the auxiliary voltage, so I801 pin 2 senses the feedback voltage from the divider R802, R823, VR801 and R821 to compare with the built-in 2.5 volts reference voltage for error amplifier operation.
  • Page 17 MEDION MD 1772LB (B1770NSL/T) 5. Under override condition, “CHECK SIGNAL” will show up on the screen. 4-6 OSD (On Screen Display) Circuit 1. The I502 HTV021-02 is OSD IC. The OSD signals are worked by positive vertical pulse from I701 pin 32 that goes through R521 to I502 pin 10, and positive horizontal pulse from HFLB1 through R513 to I502 pin 5.

  • Page 18: Alignments And Adjustments

    MEDION MD 1772LB (B1770NSL/T) 5 Alignments and Adjustments This section of the service manual explains how to make permanent adjustments to the monitor settings. 5-1 General Adjustments 5-1-1 Adjustment Conditions a) Power Supply Apply AC 115 V or 220 V...

  • Page 19: Alignment Procedures

    MEDION MD 1772LB (B1770NSL/T) 5-2 Alignment Procedures 5-2-1 High Voltage Adjustment CONDITION Display image : Crosshatch pattern PROCEDURE Connect DC meter to TP5 and adjust VR401 to obtain a DC voltage of -130 ± 0.2 V DC. 5-2-2 Screen and White Balance Adjustment...
  • Page 20 MEDION MD 1772LB (B1770NSL/T) 4-b. Adjust VR 402 to Y=29.5FL ± 1FL. 4-c. Check the white balance at 5FL and 28FL. 4-d. Repeat all the procedures in 5-2-2 section until the best white balance is obtained 5-2-3 Focus Adjustment CONDITION Display image : “e”...
  • Page 21 MEDION MD 1772LB (B1770NSL/T) Figure 4-1. Convergence Magnets on the CRT 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 6) 4-Pole Magnet...
  • Page 22 MEDION MD 1772LB (B1770NSL/T) 5-2-6 Degaussing Degaussing is required when poor color impurity appears on the screen. This monitor uses an automatic degaussing circuit that is activated when the power is on. The automatic degaussing will be fully functional again after the monitor has been in operation for 20 minutes.

  • Page 23: Troubleshooting

    MEDION MD 1772LB (B1770NSL/T) 6 Troubleshooting 6-1 No Raster Page 21...
  • Page 24 MEDION MD 1772LB (B1770NSL/T) 6-2 OSD Abnormal Page 22...
  • Page 25 MEDION MD 1772LB (B1770NSL/T) 6-3 Function Key Abnormal Page 23...
  • Page 26 MEDION MD 1772LB (B1770NSL/T) 6-4 No Vertical Scan (Raster is one horizontal line) Abnormal Normal Still no vertical scan Page 24...
  • Page 27 MEDION MD 1772LB (B1770NSL/T) 6-5 Out of Horizontal Synchronization 6-6 Out of Vertical Synchronization Page 25...
  • Page 28 MEDION MD 1772LB (B1770NSL/T) 6-7 R.G.B. Video Amplifier Abnormal Page 26...

  • Page 29: Recommended Spare Parts List

    MEDION MD 1772LB (B1770NSL/T) 7 Recommended Parts List Note: 1. The components identified by “ “ mark are critical for X-ray safety. Replace these with only the same parts specified. There is only OTP IC at the model beginning (FPR stage or before). When it put in mass production and there must be Mask coming out.
  • Page 30 MEDION MD 1772LB (B1770NSL/T) Location Part Number Description R804 6201100012 THERMISTOR 10 OHM 3A P=5 TKS R818 6220327852 FS OHM 0.27 1W J HOR T401 6135000801 XFRMR HOR DRIVE THD-1008A EI19 T402 6133070120 FBT TFB-7012 FEA867 SAMPO T403 6111155174 COIL CHOKE 150 uH...

  • Page 31: Block Diagram

    MEDION MD 1772LB (B1770NSL/T) 8 Block Diagram Q 9 6 1 V I D E O A M P B B U F F E R & R 9 7 1 , R 9 7 2 , Q 9 6 3 ,...
  • Page 32 MEDION 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...

This manual is also suitable for:

B1770nstMd1772lbB1770nsl/t

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