Optoma PanoView PV752A User manual

PV752A Service Manual
Preface
ThismanualispreparedforthemaintenanceservicefortheLCDMonitor. Maintenanceprocedures
described in this manual are intended to isolate faulty parts and replace them in the field. It also aims to
serveasaguide in procuringreplacementparts forthis 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

PV752A Service Manual
vTable of Content v
1. Introduction 1-1
1-1 The Appropriate Operation 1-1
1-2 Product Features 1-2
1-3 User Controls 1-3
1-4 Rear Connector Ports 1-4
1-5 Digital Board 1-5
2. Mechanical Construction 2-1
2-1 Package overview 2-1
2-2 Exploded view 2-3
3. Procedure of Disassembly 3-1
3-1 Disassembly Stand and Main body unit 3-1
3-2 Disassembly Panel unit and Front&Rear Covers 3-2
3-3 Disassembly Main BD & Inverter Boards and Bracket 3-3
3-4 Disassembly Panel and Bracket 3-4
4. Function of Boards 4-1
4-1 Main board 4-1
4-2 Inverter board 4-5
4-3 Control board 4-6

PV752A Service Manual
5. Troubleshooting Procedure 5-1
5-1 Equipment needed 5-1
5-2 Main procedure 5-1
6. Function Test & Alignment Procedure 6-1
6-1 Product 6-1
6-2 Test Equipment 6-1
6-3 Test Condition 6-1
6-4 Test Display Modes & Patterns 6-2
6-5 Function Test and Alignment Procedure 6-4
6-6 Hi-Pot & Grounding Test 6-6
6-7 Cleaning 6-6
7. Appendix 7-1
7-1 The serial number system definition 7-1

PV752A Service Manual
Page 1-1
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.
This manual is for the technicians and people who have the electronic background. Send the
product back to the distributor for repairing and do not attempt to do anything which is complex or
not mentioned in the troubleshooting.
❉Turn off the product before cleaning.
❉Use only a dry soft cloth when cleaning the LCDpanel surface.
❉Use a soft cloth moistured with mild detergent to clean the display housing.
❉Use only high quality and safety approved AC/DC power adapter.
❉Disconnect the power plug fromAC outlet if the product is not used for a long period
of time.
❉Do not touch the LCDpanel surface with sharp or hard objects.
❉Do not use abrasive cleaners, waxes or solvents for your cleaning.
❉Do not operate the product under the following conditions :
- Extremely hot, cold or humid environment.
- Areas susceptible to excessive dusts and dirt.
-Near any appliance generating a strong magnetic field.
- Place in direct sunlight.
1-1 The Appropriate Operation

PV752A Service Manual
Page 1-2
1-2 Product Features
rDirect analog RGB input
rActive matrix TFT LCD technology.
r15.1” diagonal screen size
r1024*768 addressable pixels
r16.7 million displayable colors
rWide Viewing Angle technology
r200cd/m2high brightness
r24-60KHz horizontal scan
r56-75Hz high refresh rate
rAuto adjustment capability
rHigh quality full screen re-scaling capability
rMultilingual OSDmenus in four lanugages : English,German, Spanish, and Japanese
rVESADDC 1/2B data communication
rVESADPMS power saving
rVESAflat panel monitor physical mounting interface (75mm)
rMTBF = 48K hours except CCFLs
r25,000 hrs. lamp life (min.)
rDot defect : bright[6, dark[6, total[10
rAgency approval : FCC-B, CE-B, VCCI-II, BCIQ, UL, CUL, TUV-GS, TCO’99
rEnvironmental Operating temperature : 5oC ~ 35oC / 41oF ~ 95oF
Humidity : 80% max.
Storage temperature : -20oC ~ 60oC / -4oF ~ 140oF
Humidity : 80% max.

PV752A Service Manual
Page 1-3
1-3 User Controls
1-3.1 Front Bezel Controls
MENU SELECT/AUTO
nocI/.oN lortnoC noitcnuF
uneMnottubuneM.sunemDSOehtpupopoT
OTUA/TCELESotuA/tceleS
tceleS morfsmetitnemtsujdaehttcelesoT- .sunemDSO otuA "tnemtsujdAotuA"ehtetavitcaoT- .egamimumitponaniatbootnoitcnuf
suniM/suniMssenthgirB
yalpsidehtfosssenthgirbehtsesaerceD.1 .egami tnemtsujdaehtfoeulavehtsesaerceD.2 .smeti
sulP/sulPthgirB
yalpsidehtfosssenthgirbehtsesaercnI.1 .egami tnemtsujdaehtfoeulavehtsesaercnI.2 .smeti
hctiwSrewoP DCLehtforewopehtffo/nosehctiwS .yalpsid
DELrewoP .nodenrutsiyalpsidehtsetacidnineerG.1 -rewopniyapsidehtsetacidnirebmA.2 .edomgnivas
3
4
3
6
1
2
5
4
36
125
4

PV752A Service Manual
Page 1-4
1-3.2 How to Use the OSD Menus
1. Press the “Menu” button to pop up the on-screen menu and to select between three
Main Menus.
2. Choose the adjustmentitemsbypressingthe“Select/Auto” button.
3. Adjust thevalue of theadjustment itemsby pressingthe “3” or “4” button.
4. Once you don’t operate the OSDmenus after a pre-set time, the OSDmenus will
automaticallydisappear.
1-4 Rear Connector Ports
DC Power-in
Display Input

PV752A Service Manual
Page 1-5
1-5 Digital Board
1-5.1 BlockDiagram
+12V
H.Vsync RGB DDC
Input Interface
R.G.B. Hsync LCD H.V sync
DE R.G.B.(2..7) DCLK
R.G.B. (0..7) Data CLK
SCL SDA
+12V 5V
3.3V
ADC
Micro Processor
DC-DC Converter
Flat Panel Controller
LCDPanel Interface

PV752A Service Manual
Page 1-6
1-5.2Description
ADC TheAD9884is a complete8-bit 140 Msps monlithic analog
interfaceoptimizdforcapturingRGBgraphicssignalsfrom
personal computers and workstations. Its 140 Msps encode
ratecapability and full-poweranalogbandwidthof 500 MHz
supportsdisplayresolutions of upto1280*1024 (SXGA) at
75Hzwithsufficientinputbandwidthtoaccuratelyacquireand
digitizeeachpixel.
TheAD9884 includesan internal+1.25Vreference,PLLto
generateapixelclockfromHSYNC,andprogrammablegain,
offsetandclampcircuits.Thisdeviceisfullyprogrammable
via atwo-wireserial port.
Flat Panel Controller Itperformsimagescalingon24-bitRGBorYUVdatastream
andfeedsthescaledpixelstoLCDpanel.AnOSD(OnScreen
Display)logic is embedded, besides,there isan overlayport
forexternalOSDsignalsinterface.Thechipembedsline
bufferssothatsame-frame-ratescalingsrequirenoexternal
memoryICs.Anautoadjustmentfunctionprovidesautomatic
frequency,phase,H&Vposition,andwhite balancetuning.
DC-DC Coverter Circuit ofDC-DC Converter used 12VDC-in to regulate
+5V & +3.3V for system use.

PV752A Service Manual
Page 1-7
Micro Processor TheW78E516B is an 8-bit microprocessor which has an
in-systemprogrammableMTP-ROMforfirmwareupdating.
TheW78E516Bcontainsa64KbytesofauxiliaryMTP-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; 512bytesofon-chipRAM;four8-bit
bi-directionalandbit-addressable I/O ports;anadditional
4-bitport P4;three16-bittimer/counters;aserialport.These
peripherals aresupported by a eight sources two-level
interruptcapability.Tofacilitateprogrammingandverification,
the MTP-ROM inside theW78E516B allows the program
memorytobeprogrammedandreadelectronically.