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Medion B1997PNST Service Manual

19-inch color monitor
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Service Manual
19-inch Color Monitor
B1997PNST (MD 1998LE)

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Summary of Contents for Medion B1997PNST

  • Page 1 Service Manual 19-inch Color Monitor B1997PNST (MD 1998LE)
  • 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. MD 1998LE (B1997PNST) Service Manual. Printed in Taiwan.

  • Page 3: Table Of Contents

    MD 1998LE (B1997PNST) Table of Contents 1. Precautions......................2 2. Product Specifications ..................5 3. Operation Theory....................9 4. Alignments and Adjustments ................14 5. Troubleshooting ....................18 6. Recommended Spare Parts List ............... 22 7. Block Diagram ....................24 8. Exploded Diagrams.................. Inserted 9.

  • Page 4: Precautions

    MD 1998LE (B1997PNST) 1 Precautions Please 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

    MD 1998LE (B1997PNST) 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. Before replacing any of these components, consult the Recommended Spare Parts List given at the end of this manual.
  • Page 6 MD 1998LE (B1997PNST) 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

    MD 1998LE (B1997PNST) 2 Product Specifications 2-1 Specifications Picture Tube 19-inch (18-inch Visual image area), 95 degrees deflection, dot type black matrix, medium short persistence phosphor, dark bulb,direct etch, Flat square screen with Invar Mask, 0.26 mm dot pitch VGA, Super VGA, 1024x768@60/70/75/85/100 Hz, 1280x960@85 Hz...
  • Page 8 MD 1998LE (B1997PNST) 2-2 Signal Cable Pin Connections Table 2-1. Signal Cable Pin Assignment Signal Signal Red vi de o +5V ( fr om PC) Gr een vi deo Gr ound Bl ue vi de o Gr ound Gr ound...

  • Page 9: Timing Chart

    MD 1998LE (B1997PNST) 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 Mode H. Dot s 1152 1024 1024 1280 1280 1024 1600 1280 V. Dot s...
  • Page 10 MD 1998LE (B1997PNST) 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: Operation Theory

    MD 1998LE (B1997PNST) 3 Operation Theory This is an I2C-bus fully digital controlled multi-sync color monitor, compliant with VESA DDC1/2B and DPMS standards. Besides, it also meets TCO95 and MPRII requirements. It provides user friendly OSM (On-Screen display Menu) controls, and offers the following main features.
  • Page 12 MD 1998LE (B1997PNST) controllable by I C bus. SDA and SCL signals coming from microprocessor feed to pin 19 and pin 18 to control all functions. 3-3-1 Horizontal Section 1. The oscillator is driven by the currents in R424 and R423. The minimum oscillator frequency is determined by R424 and the maximum frequency is determined by R423.
  • Page 13 MD 1998LE (B1997PNST) 2. In protection mode or out-of-range situation, HUNLock will send 5 V pulse to saturate Q706, then pin 8 of I902 will be low state and open Q509, so G1 will go down to -140V. During the mode change, Mute acts as same as HUNLock’s.
  • Page 14 MD 1998LE (B1997PNST) voltage. 2. Regulation The DC O/P voltage is proportional to the auxiliary voltage, so I802 pin 2 senses the feedback voltage from the divider R895, R888, R868, R897 and VR801 to compare with the built-in 2.5 volts reference voltage for error amplifier operation.
  • Page 15 MD 1998LE (B1997PNST) Horizontal dynamic focus 3-6 Video Amplifier Section 1. RGB signal inputs are terminated by R501, R531 and R561 then pass through the coupling capacitors C502, C532 and C562 to I501 M52743BSP preamplifier. 2. The amplifier RGB signals (0~3 Vpp) are adjusted by I C bus, pin 19 is for clamp pulse which comes from pin 16 of TDA4856 to set up equal clamp level.

  • Page 16: Alignments And Adjustments

    MD 1998LE (B1997PNST) 4 Alignments and Adjustments This section of the service manual explains how to make permanent adjustments to the monitor settings. 4-1 General Adjustments 4-1-1 Adjustment Conditions a) Power Supply Apply AC 115 V or 220 V b) Warm-up Time The monitor must be powered on for 15 minutes before starting any alignment, but requires 30 minutes of warm-up time for convergence adjustment.

  • Page 17: Alignment Procedures

    MD 1998LE (B1997PNST) 4-2 Alignment Procedures 4-2-1 High Voltage Adjustment CONDITION Display image : Crosshatch pattern PROCEDURE Connect DC meter to TP001 and adjust VR102 to obtain a DC voltage of -152 ± 1V DC . 4-2-2 Screen and White Balance Adjustment CONDITION Switch S701 to factory mode, then press “...
  • Page 18 MD 1998LE (B1997PNST) 4-2-3 Focus Adjustment CONDITION Display image : “e” character pattern PROCEDURE 1. Set Brightness and Contrast used for a normal display. 2. Adjust the static focus control on the high voltage resistor block to obtain the best focus over the entire display area.
  • Page 19 MD 1998LE (B1997PNST) Figure 4-2. 4-pole and 6-pole Magnets Movement Red/ Blue Blue G reen Red/ Blue Blue Green 4-pole m agnets 6-pole m agnets m ovem ent m ovem ent Note : The 4-pole magnets and the 6-pole magnets interact, making dot movement complex.

  • Page 20: Troubleshooting

    MD 1998LE (B1997PNST) 5 Troubleshooting 5-1 No Raster Page 18 Troubleshooting...
  • Page 21 MD 1998LE (B1997PNST) 5-2 Function Key Abnormal Function Key Abnormal Repair power Check 5V from supply I810 regulator? Power ON/OFF again and Replace X701 check X701, oscillator Check Replace I701 I701 uC OK? Replace Check LED LD701 OK? Q701 or Q702...
  • Page 22 MD 1998LE (B1997PNST) 5-3 Vertical Scan (Raster is one horizontal line) Vertical Scan Abnormal Check voltage of pin 3 at I301 Replace I301. (about 17.3 V) Check Check pin 12 & pin pin 4 or pin 7 waveform Abnormal 13 waveform at...
  • Page 23 MD 1998LE (B1997PNST) 5-4 R.G.B. Video Amplifier Abnormal RGB Video AMP Abnormal Check the Check Check B+ waveform at pin Check I501 the waveform at the I501 (pin17, pin36) 2, 6, 11, 19, 27 pin 29, pin 32, pin 35...

  • Page 24: Recommended Spare Parts List

    MD 1998LE (B1997PNST) 6 Recommended Parts List Note:1. The components identified by “ “ mark are critical for X-ray safety. Replace these with exactly 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 25 MD 1998LE (B1997PNST) Location Part Number Description Q802 6426002201 FET N-CHNL SSH 10N 80A I501 6442024210 IC 52743BSP 36P MITSUBISHI R415 6212147254 CF KOHM 4.7 1/4W J T26 MINI ZD401 6414150004 HZ15-2 ZNR 15V/0.5 R803 6203459017 POSISTOR 4.5 DGC3D4R5Q27C 3PIN...

  • Page 26: Block Diagram

    MD 1998LE (B1997PNST) 7 Block Diagram Page 24 Block Diagram...
  • Page 27 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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