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This manual is prepared for the maintenance service for the LCD Monitor. Maintenance procedures
described in this manual are intended to isolate faulty parts and replace them in the field. It also aims to
serve as a guide in procuring replacement parts for this product.
This manual is copyrighted and all rights are reserved. This product may not, in whole or in part
be copied, photocopied, translated or reduced to any electronic or machine readable form without prior
written consent except for copies retained by the purchaser for backup purpose.
This manual includes system overview, major system assembly, components' description, and the
"Troubleshooting" makes explanations on how to detect errors. It also includes a flow chart for
checking or correcting faults.
No Warranty or representation, either expressed or implied, is made with respect to this
documentation, its quality, performance, merchantability or fitness for particular purpose.
No event will the vendor be liable for direct, indirect, special, incidental or consequential damages
arising out of the user or inability to use this product or documentation.
Notice :
The information found in this manual is subject to change without prior notice. Any
subsequent changes made to the data herein will be incorporated in future edition.
Copyright December, 1999
All Rights Reserved
Manual Version 1.0
Document #550-G04-01A
Preface
PV752A Service Manual

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Table of Contents
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Summary of Contents for Optoma PanoView PV752A

  • Page 1 PV752A Service Manual Preface This manual is prepared for the maintenance service for the LCD Monitor. Maintenance procedures described in this manual are intended to isolate faulty parts and replace them in the field. It also aims to serve as a guide in procuring replacement parts for this product. This manual is copyrighted and all rights are reserved.
  • Page 2: Table Of Contents

    PV752A Service Manual Table of Content 1. Introduction 1-1 The Appropriate Operation 1-2 Product Features 1-3 User Controls 1-4 Rear Connector Ports 1-5 Digital Board 2. Mechanical Construction 2-1 Package overview 2-2 Exploded view 3. Procedure of Disassembly 3-1 Disassembly Stand and Main body unit 3-2 Disassembly Panel unit and Front&Rear Covers 3-3 Disassembly Main BD &...
  • Page 3 PV752A Service Manual 5. Troubleshooting Procedure 5-1 Equipment needed 5-2 Main procedure 6. Function Test & Alignment Procedure 6-1 Product 6-2 Test Equipment 6-3 Test Condition 6-4 Test Display Modes & Patterns 6-5 Function Test and Alignment Procedure 6-6 Hi-Pot & Grounding Test 6-7 Cleaning 7.
  • Page 4: Introduction

    PV752A Service Manual CHAPTER 1 Introduction This manual provides an integral technical information you need to maintain the LCD Monitor. And this manual is applied to the model of 1024*768 pixels color TFT LCD Monitor with a 15.1” flat panel screen. There are seven topics in this manual, and you can immediately identify problems through this manual.
  • Page 5: Product Features

    PV752A Service Manual 1-2 Product Features Direct analog RGB input Active matrix TFT LCD technology. 15.1” diagonal screen size 1024*768 addressable pixels 16.7 million displayable colors Wide Viewing Angle technology 200cd/m high brightness 24-60KHz horizontal scan 56-75Hz high refresh rate Auto adjustment capability High quality full screen re-scaling capability Multilingual OSD menus in four lanugages : English, German, Spanish, and Japanese...
  • Page 6: User Controls

    PV752A Service Manual 1-3 User Controls 1-3.1 Front Bezel Controls MENU SELECT/AUTO t t u e t i v i t A " " t i t c g i r e t i g i r s u l s u l e t i Page 1-3...
  • Page 7: Rear Connector Ports

    PV752A Service Manual 1-3.2 How to Use the OSD Menus Press the “Menu” button to pop up the on-screen menu and to select between three Main Menus. Choose the adjustment items by pressing the “Select/Auto” button. Adjust the value of the adjustment items by pressing the “3” or “4” button. Once you don’t operate the OSD menus after a pre-set time, the OSD menus will automatically disappear.
  • Page 8: Digital Board

    PV752A Service Manual 1-5 Digital Board 1-5.1 Block Diagram Page 1-5...
  • Page 9 PV752A Service Manual 1-5.2 Description The AD9884 is a complete 8-bit 140 Msps monlithic analog interface optimizd for capturing RGB graphics signals from personal computers and workstations. Its 140 Msps encode rate capability and full-power analog bandwidth of 500 MHz supports display resolutions of up to 1280*1024 (SXGA) at 75Hz with sufficientinput bandwidth to accurately acquire and digitize each pixel.
  • Page 10 PV752A Service Manual Micro Processor The W78E516B is an 8-bit microprocessor which has an in-system programmable MTP-ROM for firmware updating. The W78E516B contains a 64K bytes of auxiliary MTP-ROM which allows the contents of the 64KB main MTP-ROM to be updated by the loader program located at the 4KB auxiliary MTP-ROM;...
  • Page 11: Mechanical Construction

    PV752A Service Manual CHAPTER 2 Mechanical Construction 2-1 Package Overview Page 2-1...
  • Page 12: Replacement Parts List

    PV752A Service Manual 2-1.1 Replacement Parts List Item Part# Description 35.52302.091 Label, Carton 108*92 Blank 55.53405.001 Carton, AB-18 507*485*275 DC.55001.001 PV752A 56.54801.001 R Cushion 56.54802.001 L Cushion 56.54803.001 Base Cushion 56.54804.001 Support Cushion 51.53409.001 ESD Bag LDPE 57.00001.001 Pack SiO2 Drier 20g 55.54801.001 Corrugate Base 55.53402.001...
  • Page 13 PV752A Service Manual 2-2 Exploded Overview Page 2-3...
  • Page 14 PV752A Service Manual 2-2.1 Replacement Parts List Item Part# Description 70.55001.001 ASSY Main Body PV752A 35.50702.001 Label, 99*49 Blank 51.54801.002 Front Cover 51.54809.001 Lens PMMA 51.54808.001 CTRL Knob 51.54802.301 Rear Cover 51.54806.001 Decorative Cap 42.55001.001 W.A 40/41P 190mm 42.55002.001 W.A 10P/5P 1095 #28 150/200mm 42.55003.001 W.A 12P UL1571 #28 220mm (CTRL) 48.54004.003...
  • Page 15 PV752A Service Manual Item Part# Description 85.SA123.100 Screw Binding Tap Tite-P 2L M3*10 Ni 85.2A124.080 Screw Bin MECH M4*8 Ni-L 41.55001.001 EMI Tape (80773) 15*25mm 41.55002.001 EMI Tape (80773) 50*90mm Page 2-5...
  • Page 16: Procedure Of Disassembly

    PV752A Service Manual CHAPTER 3 Procedure of Disassembly 3-1 Disassemble Stand and Main body unit Hinge Cap PV752A Hinge Tilt Stand Decorate Cap Press and pull out Hinge Cap. Take Decorate Cap off. Unscreww four screws on Hinge Tilt of Stand unit to remove Stand unit. Page 3-1...
  • Page 17: Disassembly Panel Unit And Front&Rear Covers

    PV752A Service Manual 3-2 Disassemble Panel unit and Front & Rear Covers Rear Side of PV752A Front Cover Panel&LCD Bracket Rear Cover&Support Bracket Unscrew six screws on the rear side of PV752A. Turn over the monitor, lift up Front Cover and unplug the cable to take off Front Cover.
  • Page 18 PV752A Service Manual 3-3 Disassemble Main BD & Inverter Boards and Bracket Main Board Inverter Boards Mylar LCD Bracket EMI Tape Turn over LCD Bracket, unplug five cables on Inverter and Main Board. Unscrew four screws on Inverter Boards to remove them and Mylar. Tear off EMI tape, unscrew two hex screws and four screws on Main Board to remove it.
  • Page 19: Disassembly Panel And Bracket

    PV752A Service Manual 3-4 Disassemble Panel and Bracket LCD Panel EMI Core Bushings LCD Bracket Unscrew four screws on LCD Panel tolift up Panel from Bracket. Take off EMI Core and two Bushings, then pull out three cables. Page 3-4...
  • Page 20 PV752A Service Manual 3-5 Disassemble Control Board and Front Cover Control Board Front Cover Unscrew three screws on Control Board to remove it from Front Cover. Page 3-5...
  • Page 21: Function Of Boards

    PV752A Service Manual CHAPTER 4 Functions of Boards 4-1 Main Board 4-1.1 The Position of the Connectors 4-1.2 JP3 : Header 10 Connector Page 4-1...
  • Page 22 PV752A Service Manual 4-1.3 J1 : VGA Connector l a t c i t 4-1.4 JP4 : Power Connector 4-1.5 JP2 : To LG Panel Connector l a t c i t Page 4-2...
  • Page 23 PV752A Service Manual Page 4-3...
  • Page 24 PV752A Service Manual 4-1.6 JP5 : Keypad Connector c t i " " + " - " S " " t " " u Page 4-4...
  • Page 25: Inverter Board

    PV752A Service Manual 4-2 Inverter Board 4-2.1 The Position of the Connectors 4-2.2 CN1 : DC-In Connector 4-2.3 CN2 : AC-Out Connector a t l a t l a t l a t l Page 4-5...
  • Page 26: Control Board

    PV752A Service Manual 4-3 Control Board 4-3.1 The Position of the Connectors JP5B 4-3.2 JP5B : Connector c t i " " + " - " S " " t " " u Page 4-6...
  • Page 27: Troubleshooting Procedure

    PV752A Service Manual CHAPTER 5 Troubleshooting Procedures 5-1 Equipment Needed PanoView 752A PC (Personal Computer) with XGA Card Screw Driver 5-2 Main Procedure Start Connect all of devices to PV752A Power-on A. Power Circuit Is indicator light ? Troubleshooting Page 5-1...
  • Page 28 PV752A Service Manual B. Backlight Is backlight on ? Troubleshooting Display C. Performance performance ok ? Troubleshooting Function D. Function adjustment ok ? Troubleshoting No Trouble Found Page 5-2...
  • Page 29 PV752A Service Manual 5-2.1 A. Power Circuit Troubleshooting Start Change AC/DC Adapter and retry power Change Main Board Change Control Board Page 5-3...
  • Page 30 PV752A Service Manual 5-2.2 B. Backlight Troubleshooting Start Change Inverter Board Change Main Board Change LCD Module Page 5-4...
  • Page 31 PV752A Service Manual 5-2.3 C. Performance Troubleshooting Start Change Change Is screen Main Board VGA Cable scrollig ? Change Change Is screen Change Inverter Board LCD Module flickering ? Main Board Is LCD Change line defective ? LCD Module Change Have Change Inverter Board...
  • Page 32 PV752A Service Manual Reset & Screen with Adjust “Tracking” or noise or line bar “Frequency” Change Main Board Page 5-6...
  • Page 33 PV752A Service Manual 5-2.4 D. Function Troubleshooting Start Change Control Board and retry Change Main Board Page 5-7...
  • Page 34: Function Test & Alignment Procedure

    PV752A Service Manual CHAPTER 6 Function Test & Alignment Procedure 6-1. Product : 15.1” LCD Monitor 6-2. Test Equipment : Color Video Signal & Pattern (or PC with XGA resolution) Hi-pot & Grounding measurement Shadow gauge or Filter film of 2% and 5% 25X Monoscope or Blemish film 6-3.
  • Page 35: Test Display Modes & Patterns

    PV752A Service Manual 6-4. Test Display Modes & Pattern 6-4.1 Compatible Modes Resolution V. Freq. (Hz) H. Freq. (KHz) Standards 640*350 31.5 IBM VGA 640*400 31.5 IBM VGA 720*400 31.5 IBM VGA 640*480 31.5 IBM VGA 640*480 37.9 VESA VGA 640*480 37.5 VESA VGA...
  • Page 36 PV752A Service Manual Fine Line Morie Pattern (Figure 1) Gray Scale Pattern (Figure 2) Horizontal & Vertical Thickness Pattern (Figure 3) R. Color Pattern (Figure 4) G. Color Pattern (Figure 5) B. Color Pattern (Figure 6) Page 6-3...
  • Page 37: Function Test And Alignment Procedure

    PV752A Service Manual Full White Pattern (Figure 7) Dark Screen Pattern (Figure 8) 6-5. Function Test and Alignment Procedure 6-5.1 All Mode Reset Please press “+” and “-” functions on front bezel and trun on Power simultaneously and keep unreleased for 2 seconds. Then, the screen will show “ALL MODES RESET”. This action will allow you to erase all end-user’s setings and restore the factory defaults.
  • Page 38 PV752A Service Manual 6-5.4 Boundary Test Signal : 1024*768@75Hz Test Pattern : Horizontal & Vertical Line Thickness Pattern v Check and see if the image boundary is within the screen frame. v If not, readjust by the following steps : (a) Select and enter “Position”...
  • Page 39: Hi-Pot & Grounding Test

    PV752A Service Manual 6-5.9 All Mode Reset After final QC step, we have to erase all saved changes again and restore the factory defaults. Please press “+” and “-” functions on front bezel and trun on Power simultaneously and keep unreleased for 2 seconds.
  • Page 40: Appendix

    PV752A Service Manual CHAPTER 7 Appendix 7-1 Serial Number System Definition 7-1.1 Serial Number for LCD Display A BBB Y WW C D BEMO EEEE A = CTX Opto, B~Z = OEM Product code (ex: 550=PanoView752A) Y = Last number of the year (ex: 1998 - 8, 1999 - 9) Week of inspection Panel vendor code Electrical classification (1=110V, 2=220V, 0=universal)
  • Page 41 PV752A Service Manual 7-1.2 Serial Number for PCBA Main Board L BB M Y M A1 AAAA L = LPP, M = LMT BB = Model code (ex:80=PV752A..etc) M = Main board, A = A/V board, D = Driver board Last number of the year (ex:1998 - 8, 1999 - 9) M = Month (Jan.~Sep.=1~9, Oct.~Dec.=X,Y,Z) A1 = version (A1~AZ, B1~BZ..)
  • Page 42 PV752A Service Manual Reader’s Response Dear readers: Thank you for your backing our service manual up. In order to refine our content of the service manual and satisfy your requirement. We expect you can offer us some precious opinions for reference. Assessment : Assessment : A.

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