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Mitsubishi Electric Diamond View 1995SL Service Manual

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CRT Monitor
Service Guide
Diamond View Model
1995SL
November 2000
Distributed by
Mitsubishi Electric Australia Pty. Ltd.
A.B.N. 58 001 215 792
348 Victoria Road
RYDALMERE NSW 2116
Australia
Telephone 1300 651 808

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Summary of Contents for Mitsubishi Electric Diamond View 1995SL

  • Page 1 CRT Monitor Service Guide Diamond View Model 1995SL November 2000 Distributed by Mitsubishi Electric Australia Pty. Ltd. A.B.N. 58 001 215 792 348 Victoria Road RYDALMERE NSW 2116 Australia Telephone 1300 651 808...
  • Page 2 Copyright Copyright ã 1996 by the Company. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of the Company.
  • Page 3 Diamond View CRT Monitor 1995SL Manual Contents Section Engineering Specifications Circuit Operation Theory Alignment procedure Trouble Shooting Parts List Schematic Diagrams Assembly...

  • Page 4: Table Of Contents

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Table of Contents 0. Introduction : ............................. 3 1. ELECTRICAL CHARACTERISTICS ....................3 1.1 Power Supply........................3 1.2 Signal Interface........................3 1.3 Scan Range ......................... 4 1.4 Video Performance ......................4 1.5 Timings ..........................
  • Page 5 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Table of Contents Fig.4 Picture Distortion & Phase Measurements ..........25 Fig.5 TCO 99 Pincushion Measurements ..............26 Fig.6 TCO 99 Barreling Measurements ..............27 Table 5 - TCO 99 Spec......................28 A.

  • Page 6: Introduction

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 0. Introduction : The subject model is designed for a value line 19” color monitor. It has the following figures : 0.26mm dot pitch , short length CRT, 176MHz video bandwidth ,1600X1200 max resolution. Low radiation TCO99 standard, ISO 14000 certificated green design.

  • Page 7: Scan Range

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 1.3 Scan Range Remark Spec Horizontal 30 ~ 95 KHz Vertical 50~ 160 Hz OK: Positive performance N. A.: Not applicable for this set 1.4 Video Performance Remark Condition Spec Dot Rate 176 MHz Max.

  • Page 8: Environment & Reliability

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 2.ENVIRONMENT & RELIABILITY Remark Condition Spec +5 ~ +40℃/ 20~90% R.H. Operation Temp./Humidity Non-condensing -20~ +60℃/ 10~90% R.H. Non- Operation Temp./Humi. Non-condensing Altitude Operating condition 0~3048m (10,000ft) Without packing Non-operating condition 0~12,192m (40,000ft) With packing Vibration...

  • Page 9: Front Of Screen

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification sheet 4.FRONT OF SCREEN 4.1 Geometry Remark Magnetic Environment Northern Hemisphere H = 0 + 0.05 V = +0.45 + 0.05 Southern Hemisphere H = 0 + 0.05 V = -0.45 + 0.05 Equatorial H = 0 + 0.05 V = 0 + 0.05...

  • Page 10: Image Stability

    MEA 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Color Tracking x, y (nominal) + 0.015 Brightness cut off “ Max Brightness with ABL 30Ft-L(Cut-off) Full white pattern “ Max Brightness no ABL 40Ft-L (Cut-off) 3” Block “ Brightness Uniformity >...

  • Page 11: User Controls

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 5. USER CONTROLS 5.1 Basic Remark Function Spec Power Switch Contrast Brightness H Size H Position V Size V Position Barrel/Pincushion Parallelogram Trapezoid 5.2 Advanced Remark Function Spec OSD position See Table 3 Color Gain Corner Pin-balance...

  • Page 12: Weight

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Carton Box W x H x D mm 575 x 522 x 536 mm Tilt and Swivel range Tilt : -5/+15 degree Swivel:- 45/ +45 degrees 6.2 Weight Remark Spec Monitor (Net) 19 Kg Monitor 23 Kg...

  • Page 13: Pallet & Shipment

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 7. Pallet & Shipment 7.1 Dimension Transport Type Pallet A Pallet B Pallet C Shipping Pallet Length 1150 Dimension(mm) Width 1072 Height Air Transport Pallet Length 1072 Dimension(mm) Width 1150 Height 7.2 Shipping Container Stowing Type Quantity of...

  • Page 14: Air Transport Container

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 7.3 Air Transport Container Container Type Quantity of products Quantity of Products Quantity of pallet (sets) (sets) (sets) (Every container) (Every Pallet) (Every Container) Container Pallet A: Pallet A: 4 3048 * 2286 * 2438 Pallet B: Pallet B: 2...

  • Page 15: Appendix

    1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification 73/23/EEC CB (Nordics) TUV/GS EN60950 CCIB (China) EIAJ/JEIDA (Japan) NOM (Mexico) IAA (Korea) CE Mark 89/336/EEC FCC (USA) Class B EN55022 Class B CISPR 22 Class B VCCI (Japan) Class B BCIQ (Taiwan) C-Tick (Australia) AS3548...
  • Page 16 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Header ID Manufacturer Name = MEA ID Product Code = 1995SL (Vender Assigned code) ID Serial Number Week of Manufacture (0-53),use 0 if n/a Year of Manufacture (year - 1990) EDID version Revision Video Input Define Max.
  • Page 17 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Established Timing II Established Timing III Standard Timing Identification #1 1600x1200 / 65Hz #2 800x600 / 85Hz #3 1024x768 / 85Hz Detailed Timing Description # 1 WS8 1280x1024 91.15k/85Hz...
  • Page 18 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Address Data Description Detailed Timing Description # 2 Monitor Name MEA 1995SL Detailed Timing Description # 3 Range Limit: Vertical refresh rate 50Hz~160Hz Horizontal frequency 30KHz~95KHz...
  • Page 19 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification...
  • Page 20 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Address Data Description Detailed Timing Description # 4 Serial number. PS: Example : Monitor serial number in description from 71 to 75 is 23456 ASCII data string in descriptor until 0A end. 20 is mean Null string.
  • Page 21 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Note 1 Description Analog / Digital Input : Defines usage of the rest if the byte as "analog input" or digital input". Analog=0, Digital=1 . If input is described as analog, the following definitions apply to bits 6-0.
  • Page 22 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Note 2 Bit 7 Stand-by Bit 6 Suspend Bit 5 Active off Bit 4-3 Display Type 0,0 - Monochrome/gray scale display 0,1 - RGB color display 1,0 - Non-RGB multicolor display (example:RGY) 1,1 - Undefined.
  • Page 23 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Note 4 Byte 1 Established Timings 1 Source 640*400 @ 70Hz (720x400) (VGA, MEA) 720*400 @ 88Hz (XGA2, MEA) 640*480 @ 60Hz (VGA, MEA) 640*480 @ 67Hz (Mac II, Apple) 640*480 @ 72Hz (VESA) 640*480 @ 75Hz (VESA)
  • Page 24 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Table 2 - CRT Blemish & Scratch Spec The following criteria is applied to high-contrast blemishes. Allowable No. of Blemishes Allowable Minimum Blemishes Separation Zone Zone Total (Zones A & B ) Zone A Zone B 1 trio...
  • Page 25 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Table 4- Geometry Fig. Fig.1 Linearity Measurements X11 ~ X18 Xmax - Xmin ------------------- X 100% < 5% Xmax + Xmin Ymax - Ymin ------------------- X 100% < 5% Ymax + Ymin...
  • Page 26 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Fig.2 General Pincushion Measurements Bmm b1 A, B represented as display area width and height Top/Bottom Pincushion = (a1 or a2) Side Pincushion = (b1 or b2) Substituted A by (PS + QR)/2 B by (PQ + RS)/2...
  • Page 27 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Fig.3 Trapezoid Measurements * Each of the 4 corners of picture shall fall within the relevant area (F) illustrated up (hatched) * ABCD is the picture outlines.
  • Page 28 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Fig.4 Picture Distortion & Phase Measurements orthogoal Tilt Total Peak − − − ≤ ≤ ≤...
  • Page 29 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Fig.5 TCO 99 Pincushion Measurements ∆ y1 ∆x1 ∆ x2 ∆ y2 [AC+EG]/2, [AG+CE]/2 represented as display area width and height Top/Bottom Pincushion = y1 or y2 Side Pincushion = x1 or x2 Linearity (TCO99) = x1/x or y1/y...
  • Page 30 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Fig.6 TCO 99 Barreling Measurements ∆ y1 ∆x1 ∆ x2 ∆ y2 [AC+EG]/2, [AG+CE]/2 represented as display area width and height Top/Bottom Pincushion = y1 or y2 Side Pincushion = x1 or x2 Linearity (TCO99) = x1/x or y1/y...
  • Page 31 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Table 5 - TCO 99 Spec A. Ecology 1 General Criteria 1.1 Manufacturing Processes 1.1.1 Ozone Depleting Substances: * PCB and any Process shall not use any ozone depleting substance. 1.1.2 Chlorinated Solvent: * PCB and any Process shall not use any Chlorinated Solvent substance.
  • Page 32 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification B. CRT Display Part 1: Visual Ergonomic - Legibility 1.3 Linearity: * <= 1%, (See Fig.5 & Fig.6) 1.4 Orthogonality: * H/V: <= 2%, Diagonal: <= 3% 1.5.1: Display Luminance: * >=100cd/m (80% Loading) 1.5.2 Luminance Uniformity: * <...
  • Page 33 1995SL CRT Monitor Service Guide Chapter 1 Engineering Specification Part 2: External Alternate Magnetic Fields: 2.1: External Alternating Magnetic Fields: * < 0.1 mm (500 mm Viewing Distance; 80Hz, 200nT.) Part 3: Emission and Energy Saving 3.1 X-Ray : * < 0.5 mR/Hr 3.2 Electrostatic Potential: * <+-0.5KV 3.3 Electric Field (AC): * Band I <...
  • Page 34 1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory Table of Contents 1995SL System Block Diagram ......................3 Switching Power Supply Operation Theory ................... 4 1. General Specification....................... 4 2. Block Diagram ......................... 4 3. Circuit Operation Theorem ...................... 5 3.1 RFI FILTER.......................
  • Page 35 1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory Table of Contents [ ABL Circuit ] ..........................19 [ Dynamic Focus Circuit ] ......................19 Video Output Circuit..........................20 [ Design Specification ] ........................ 20 [ CRT Specification ] ........................20 [ Block Diagram ] .........................

  • Page 36: 1995Sl System Block Diagram

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 1995SL System Block Diagram 19" Yoke signal source Video Amplifier Micro-controller & RS-232 Interface Horizontal & Vertical Deflection Circuit HV Generation Switching Power Supply & 90 - 264 VAC Power Saving...

  • Page 37: Switching Power Supply Operation Theory

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory Switching Power Supply Operation Theory 1. General Specification Input Voltage : 90~264VAC (FULL RANGE) Input Frequency : 47~63Hz Output Requirement: Output MAX. Load Current +6.5V 0.7 A +16.5V 0.8 A +85V 0.15A +200V...

  • Page 38: Circuit Operation Theorem

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3. Circuit Operation Theorem 3.1 RFI FILTER C602 L602 L603 2200P C601 250V R601 0.47U 250V 430K C603 1/2W L604 2200P 250V This circuit designed to inhibit electric and magnetic interference for meet FCC, VDE, VCCI standard requirements.

  • Page 39: Switching Element And Isolation Transformer

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3.3 switching Element and isolation transformer FR701 T601 (SHORT) R604 C613 ZD650 0.01U (OPEN) D607 RGP10J FR702 L606 L609 (BEAD) (BEAD) (SHORT) L608 D608 RGP10J (BEAD) C614 Q602 220P FS14SM-12 L607 (BEAD) R619...

  • Page 40: Control Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3.5 Control circuit R607 C625 0.15 50V (D) 330P R611 VREF R613 R614 IC601 ISSEN D612 100K 1N4148 UC3842 COMP C615 D613 1000P 1N4148 C619 ZD602 IC603 (PE) MCR100-3 0.047U C620 R622 C618...

  • Page 41: Feedback Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3.6 Feedback circuit This power supply adopt feedback circuit of +190V. It used IC701 for voltage regulation and IC602 for primary- secondary isolation, The output voltage differential signal will be detected and sensed to the pin2 of UC3842 for comparison then the duty cycle of MOSFET will be decided to control the output voltage.

  • Page 42: Mea 1995Sl Microcontroller Circuit Operation Theory

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory MEA 1995SL MICROCONTROLLER CIRCUIT OPERATION THEORY 1. Introduction This model, 1995SL, will support powerful OSD function to help end user fine adjustment. The Microcontroller circuit of the 1995SL can determine what mode it is by detecting the frequency of horizontal and vertical synchronous and the polarity of horizontal synchronous, and provide DC voltages to control the picture and save the adjusted value into the EEPROM by using the OSD,...

  • Page 43: Mcu And The Peripheral Circuit Operation Theory

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3.MCU and the peripheral circuit operation theory: 3-1.MCU function The MCU is MTV212, it is an 87C51 with PWM output controlled microcontroller, after power on, the reset circuit output a "High" to "Low" signal(>40mS) and the 12MHz crystal oscillated circuit working , the MCU begin to manages the following functions, (1) To detect mode and output proper SC0 ~ SC5 to deflection circuit.

  • Page 44: 3-4.How To Memorize The Timing And Adjusted Data

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory 3-4.How to memorize the timing and adjusted data The EEPROM of 1995SL is 24C08, it has 1024 bytes memory size and communicates with MCU by two wires of I 2 C bus, one wire is "SCL," the other is "SDA". The MCU send clock and data to EEPROM to do "Write"...

  • Page 45: Deflection Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory Deflection Circuit G1 & Spot Killer (Q201,Q202,Q203) To Video HUNLOCK Vertical Deflection Vertical Output VOUT1 H/H+V Yoke VOUT2 (IC202--TDA8351) Sync. Video (Q382) Input V Sync. X-Ray Input XRAY Protection 26KV Output Generation BDRV...
  • Page 46 1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory TDA4856 is a high performance and efficient solution for auto-sync monitors. Shown as fig. , all functions are controllable by I2C bus. TDA4856 provides synchronization processing, horizontal and vertical synchronization with fill auto-sync capability, a TV/VCR mode and very short settling time after mode changes.

  • Page 47: [ 1995Sl Autosync Deflection Controller Circuit ]

    5SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory [ 1995SL Autosync Deflection Controller Circuit ] The auto-sync deflection control circuit is shown as fig. R214 and R215 are known as RHBUF and RHREF which determine fmax and fmin of the horizontal oscillator. For 98e, free-run mode is 28.5KHz and the frequency range is from 31KHz to 86KHz.

  • Page 48: [ G1 And Spot-Killer ]

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory p negative pulse and sent to G1 grid to cancel the vertical retrace line of the raster. [ G1 and Spot-killer ] When the monitor power turns off, horizontal and vertical deflection will stop quickly, but the light output still remains on screen and turns into a light spot at the center screen to destroy the monitor.

  • Page 49: [ Tilt Circuit ]

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory [ Tilt Circuit ] Q204 generates a 12V PWM and the buffer (Q205 and Q206) outputs 0~11VDC to get positive and negative coil current for tilt. [ Horizontal Size Modulation Circuit ] <...

  • Page 50: H-Size Output Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory < H-size Output Circuit > H-output circuit has a positive collect pulse up to 1200V Q314 acts as a PWM converter for B+ to accept PWM waveform and vary on/off duty. <...

  • Page 51: Cs Control Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory < Cs Control Circuit > The monitor needs several Cs capacitors to obtain good linearity picture from 31K to 86KHz modes. Cs capacitors include C309 ~ C313. They are switched by IC301 and switch control signals are sent from uC IC801. The switching truth table is as follows: <...

  • Page 52: [ High Voltage Processing Circuit ]

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory [ High Voltage Processing Circuit ] The high voltage circuit uses two MOSFETs (Q320 and Q323) to drive FBT to generate HV up to 26KV. HVDRV and BDRV both are from IC201 but are opposite waveforms. HV-FB is the feedback signal for HV compensation to adjust the duties of HVDRV and BDRV.

  • Page 53: Video Output Circuit

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory Video Output Circuit [ Design Specification ] Input : D-sub connector Sync type : Separate Sync (H-sync & V-sync) Pixel rate = 150 MHz Light output @ 3” block pattern = 35 F.L. min [brightness at cut-off and contrast max] @ full white pattern = 28 F.L.

  • Page 54: [ Circuit Descriptions ]

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory [ Circuit Descriptions ] Preamplifier IC101 (LM1279) is a high bandwidth preamplifier with OSD mixer. CONTRAST voltage controls the gain of three guns simultaneously. R, G, B DRIVE voltages control the gains of these three guns individually to approach the white balance of CRT.

  • Page 55: Crt Driver (Lm2435)

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory CRT Driver (LM2435) IC102 (LM2435) contains three wide-bandwidth cascode amplifiers. The parasitic capacitance and inductance between IC102 outputs and cathodes will also influence the frequency response of IC102. The diodes and series resistors between cathodes and IC102 output pins are used to protect IC102 during the tube arcing.

  • Page 56: Dc Restoration

    1995SL CRT Monitor Service Guide Chapter 2 Circuit Operation Theory DC Restoration The amplified video signals are AC couple to cathodes. So a DC restoration circuit is needed to fix their DC levels. By adjusting R,G,B bias voltages. The raster can be set to specific color temperature. The control ranges at Q122/Q142/ Q162 emitters are about 80V ~ 53V.
  • Page 57 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Table of Contents Preparation for alignment : ........................2 1. B﹢Adjustment............................3 2. HV Adjustment............................3 3. H-center Adjustment :........................... 3 4. H-size preset :............................3 5. Factory setting mode adjustment ......................3 6.

  • Page 58: Preparation For Alignment

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Preparation for alignment : (I) Setup unit and keep it warm up at least 30 minutes (II) Signal mode Mode Frequency (H/V) Display 31.47K / 70 (-/+) 640 * 400 (VGA400) 37.50K / 75 (-/-) 640 * 480 (6448A)

  • Page 59: B﹢Adjustment

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure 1. B﹢ ﹢ ﹢ ﹢ Adjustment a. Input mode 91K (1280x1024) with cross-hatch Pattern. b. Set brightness and contrast in OSD to maximal value. c. Adjust main board VR701 to main 200V ± ± ± ± 0.5V. 2.

  • Page 60: Focus Adjustment

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure 6. Focus adjustment a. Input mode 91K (1280x1024) with green cross-hatch pattern. b. Adjust V(F2) Focus VR of FBT to make vertical line between center and corner area of CRT clear. c.

  • Page 61: Clear All Of User Mode Data

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure 9. Clear all of user mode data After finishing all factory setting , select “Reset to default “at MENU 1 then press enter. 10. Geometry Specification ITEM DESCRIPTION SPECIFICATION 350 ± 4 mm HORI SIZE 262 ±...
  • Page 62 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure g. Disconnect the signal cable from input ,then power on , the unit will go into "Override" mode. The OSD windows will show “no signal”, and the LED indicator is green. The power consumption is normal. h.

  • Page 63: Eyelet & Touch Up

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure 12. Eyelet & Touch up Eyelet: IC301, Q317 headsink , H & V dy , T303 FBT , C612 , Q602...
  • Page 64 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Touch up : T303 FBT , TR602...

  • Page 65: Wire Dressing

    1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure 13. Wire dressing: Right side Top side...
  • Page 66 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Back side Right side Braid wire...
  • Page 67 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Left side FBT schielding & braid wire Top view FBT wire core...
  • Page 68 1995SL CRT Monitor Service Guide Chapter 3 Alignment Procedure Ac GND wire & PCB GND wire...
  • Page 69 1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting Table of Contents 0. Introduction ..........................2 1. System trouble category ......................2 2. Trouble shooting for short circuit ..................... 3 3. Trouble shooting for bad geometry..................4 4.Trouble shooting for no picture....................5 5.

  • Page 70: Introduction

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 0. Introduction This 1995SL trouble shooting guide has flow chart and trouble list to show the easy problem solution for engineers. Please follow this guide and step by step to maintain your 1995SL when the system is in any trouble.

  • Page 71: Trouble Shooting For Short Circuit

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 2. Trouble shooting for short circuit Short circuit Start ** Key components: Q323,Q320,Q302,Q317,Q301 D308,D303 Check Damage **key components Replace Remove +200V, +85V,+16V, +12V,+6.5V, respectively Check Fail short circuit reason on each Vcc path Success Figure.2 Trouble shooting for Short circuit...

  • Page 72: Trouble Shooting For Bad Geometry

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 3. Trouble shooting for bad geometry Item Status Reason Check Note Vertical one line Hor. deflection failure R301,R355,R328 Horizontal one line Ver. deflection failure IC202,R227,R228,R233 Bad focus Dynamic focus failure Q324,R347,C333,C348,C349, T304 Picture dimension too HV less than 26KV(philips)

  • Page 73: Trouble Shooting For No Picture

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 4.Trouble shooting for no picture No picture Start Connect to signal Blanking About -180V voltage Normal Adjustable -50~-70V Check Abnormal 0 Vp-p output Cathode voltage Check Normal OSD and Adjustable 0 - 55Vp-p video amplifier output Abnormal...

  • Page 74: Trouble Shooting For Bad Video

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 5. Trouble Shooting for bad video Bad video Start No picture Video OK, but no OSD Picture quality No video, No picture Check OSD,MCU but OSD OK for no OSD Check Cathode, Check G1,G2,HV...
  • Page 75 1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting Lack one or more video Video output path open or Check open or short circuit color short circuit from video input to output Lack one or more video Components damage IC102,IC101 color D111,D112,D131,D132, D151,D152...

  • Page 76: Power Supply

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 6.Power supply POWER NO OUTPUT NO OUTPUT Check Check Replace Replace Replace D701,D702,D703, Check F601,BD601 Q602,R618 Q602,R618 F601,BD601 D704,D705 D701,D702,D703, ok ? R607,R611 R607,R611 D704,D705 Replace Check Check Replace Check Replace IC601,Q601 IC601,Q601 FR704...

  • Page 77: Check Mcu And Osd For No Video Output

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 7. Check MCU and OSD for no video output Check MCU and OSD for no video output Start Use a preset timing Check +5V, ok ? (1) On the Main Board, (a) IC801 pin5 (b) IC802 pin8 Check +5V power...

  • Page 78: Check Osd,Mcu For No Osd Window

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 8. Check OSD,MCU for no OSD window Check OSD, MCU for no OSD window Start Check +5V, ok? (1) IC1901(OSD IC) pin 6,19 Check +5V power Check Check IC1901 (OSD IC) pin 4 have DC 1~3V pin 2,3,4,5 with oscillation wave? and the R,C CKT...

  • Page 79: Dis-Assembly

    1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 9. Dis-assembly 1. Remove left 2 pcs screw 2. Remove right 2 pcs screw 3. Push backcover 4. Take signal cable cover 5. Remove left & right hook 6. Take base frame...
  • Page 80 1995SL CRT Monitor Service Guide Chapter 4 Trouble Shooting 7. Remove main pcba hook 8. Take main pcba 9. Replacement component .
  • Page 81 Diamond View CRT Monitor 1995SL Main Board 1 of 5...
  • Page 82 Diamond View CRT Monitor 1995SL Main Board 2 of 5...
  • Page 83 Diamond View CRT Monitor 1995SL Main Board 3 of 5...
  • Page 84 Diamond View CRT Monitor 1995SL Main Board 4 of 5...
  • Page 85 Diamond View CRT Monitor 1995SL Main Board 5 of 5...
  • Page 86 Diamond View CRT Monitor 1995SL Video Board 1 of 2...
  • Page 87 Diamond View CRT Monitor 1995SL Video Board 2 of 2...
  • Page 88 Diamond View CRT Monitor 1995SL Assy Drawing...