52” VideoWall Display WN-5220-V Module Level Service Guide 070-0001-01
Clarity Visual Systems 1997 by Clarity Visual Systems™, Inc. All Rights Reserved. Contents of this publication may not be reproduced in any form without permission of Clarity Visual Systems, Inc. Trademark Credits Macintosh is a registered trademark of Apple Computer Corp. IBM is a registered trademark of International Business Machines, Inc. Windows is a trademark of Microsoft Corp. All other names are trademarks or registered trademarks of their respective companies.
WN-5220-V Module Level Service Guide LIMITED WARRANTY. Clarity warrants to Buyer that the WN-5220-V (the “Product”), if properly used and serviced, will perform substantially in accordance with the product data sheet and users manual, and will be free from defects in material and workmanship for 1 year following date of shipment. This warranty does not apply to lamps (see following section for lamp warranty) and other consumable parts.
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WN-5220-V Module Level Service Guide Table of Contents SAFETY ............................................................................................................................ 1 MODULE IDENTIFICATION ................................................................................................ 5 PREVENTATIVE MAINTENANCE ......................................................................................... 9 SCREEN .............................................................................
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WN-5220-V Module Level Service Guide Safety Please read this chapter carefully before attempting to install, use, service, or repair the WN5220-V VideoWall. Hazardous voltage inside. Can shock, burn, or cause death. No user serviceable parts inside. Refer all service to qualified serviceman.
Clarity Visual Systems Hazardous voltage. Can shock, burn or cause death. Disconnect power cord before servicing this unit. Refer to service manual for details. Explosion hazard. Hot bulb under high pressure. Wait more than 5 minutes before changing lamp. Handle lamp assembly carefully; do not touch bulb. See instructions for changing lamp assembly. Hot surface near lamp. Skin burn hazard. Wait more than 5 minutes for lamp housing to cool before replacing lamp assembly. See instruction manual.
WN-5220-V Module Level Service Guide UV radiation from unprotected, operating bulb. Eye damage injury. Do not disturb light path shielding from the bulb. ∇ WARNING Only the WN-5220-V lamp, air filter, and fuse are user serviceable. Refer all other service to a qualified service center. Failure to do so can result in electrical shock, ultraviolet radiation burns, contact heat burns, serious injury, or irreparable damage to the WN-5220-V.
Clarity Visual Systems ∇ CAUTION Some types of environmental lighting, such as incandescent, or high-intensity discharge lamps such as metal halide or mercury vapor lamps create high temperatures. This can cause excessive heating of the WN-5220-V VideoWall. The WN-5220-V VideoWall installation should be positioned away from lighting to prevent heat buildup. ∇ CAUTION The front screen of the WN-5220-V VideoWall can be easily scratched and the optical quality degraded by fingerprints.
WN-5220-V Module Level Service Guide Module Identification There are eight main modules in the WN-5220-V. These are field replaceable modules that represent most of the functional pieces of the VideoWall. Two of them, the Lamp and Air Filter, are designed to be user replaceable since they are a consumable that will need to be replaced periodically. The Screen assembly is also user replaceable, but it should not need to be replaced unless it becomes scratched or dented.
Clarity Visual Systems Front View (screen off) Back View 6 September 1997
WN-5220-V Module Level Service Guide Back View (access covers off) Front/Side View (screen off) 7
Clarity Visual Systems Front View of the Internal Cables The High Voltage Lamp Cable runs between the Power Supply Module and the Lamp. The LCD Flat Cable runs between the Electronics Module and the Optical Engine. The DC Power Wiring Harness runs between the Power Supply Module and the Electronics Module. The fans also connect to this harness. The Interlock Wiring Harness connects to the DC Power Wiring Harness and makes a serial connection through the two interlock switches and the thermal switch.
WN-5220-V Module Level Service Guide Preventative Maintenance Preventive maintenance consists of replacing the air filter when it is dirty, ensuring that the screen is clean and free of smudges or scratches, and cleaning the mirrors if they become smudged or dusty. The projection lamp has a service life of 3,000 hours and should be replaced at that time for trouble-free operation. Screen Removing the screen provides service access to other replaceable modules from the front of the VideoWall.
Clarity Visual Systems Lamp ∇ WARNING Before attempting to remove the lamp module, switch off the WN-5220-V with the remote and allow the lamp cooling cycle to complete (3 – 4 minutes) before switching off power at the rear-panel power switch. The lamp module may be removed and replaced from the front by first removing the screen, or from the rear by removing the lamp service access cover.
WN-5220-V Module Level Service Guide Length of time between air filter replacements depends on the environment in which the VideoWall is operated. Air filter cleanliness should be monitored often and the air filter replaced at least every 3000 hours of operation. An excessively dirty air filter can block airflow to the optical assembly and cause excessive heat buildup inside the VideoWall. The air filter is most easily accessed from the rear of the VideoWall by first removing the lamp access cover.
Clarity Visual Systems Cleaning the Screen The screen’s lenticular pattern is sensitive to smudges and scratches. To clean smudges from the screen, use a soft cloth and a non-abrasive, non-hydrocarbon cleaner. Wipe the screen from top to bottom, or vertically (in the direction of the lenticular pattern). Cleaning the Mirrors The WN-5220-V’s optical mirrors can become dusty in normal operation, particularly if the operating environment is dusty.
WN-5220-V Module Level Service Guide Service Menu The Service Menu provides access to the several options that can be useful in diagnosing failures and setting-up the displays. The service menu for both the older electronics (one Monitor ID knob) and the newer electronics (two Monitor ID knobs) is accessed the same way, but the contents of the two menus are different. On the older electronics, the Service Menu was added at revision 3. Firmware older than revision 3 does not have the Service Menu feature.
Clarity Visual Systems This will bring up the Service Menu, providing access to the following features: Older Electronics (one Monitor ID knob and firmware version 3 or higher) Service Menu [ [ [ [ [ < ] ] ] ] ] > Lockout Disable Reset System Hours Initialize EEPROM Test Patterns Gamma Disable OEM Select: 000 Lockout Disable Reduces the standby-delay time from 3 minutes to 3 seconds. This can be useful when diagnosing start-up problems.
WN-5220-V Module Level Service Guide Test Patterns Brings up the following sub-menu that generates the full-screen patterns: Test Patterns [X] [ ] [ ] [ ] [ ] [ ] [ ] [ ] Off White Black 50% Gray Red Green Blue Geometry Most of these are self explanatory. Off – allows the source data/video to be displayed Geometry- displays a black background with a white grid pattern. The outside edge of the image is a white line that is one line wide.
Clarity Visual Systems When an arc-lamp of this type is first turned on, the power supply has to produce between 4000 and 30,000 volts to heat the gas in the lamp to start the illumination reaction. As the gas heats up, the voltage drops to the operating voltage of around 90 volts. If an attempt is made to restart a hot lamp, the initial surge of high voltage will cause permanent damage to the lamp – significantly reducing it’s life. The 3 minute standby-delay prevents re-ignition of a hot lamp.
WN-5220-V Module Level Service Guide Field Replaceable Unit Procedures Electronics Module The Electronics Module houses the controller board, which provides connections for all signals entering and leaving the WN-5220-V. It also contains the microprocessor and all control circuitry that drives the LCD. This procedure requires access to the back of the VideoWall. ∇ CAUTION Always switch off the WN-5220-V before connecting or disconnecting cables.
Clarity Visual Systems other is on the opposite corner of the Electronics Module near the projection lens. 9. Remove the Electronics Module From inside, lift the electronics module and withdraw. Be careful not to scrape the big mirror. Replacement is the reverse of this procedure. When replacing the ribbon cable, make sure that the conductors are oriented toward the front, seat the cable in the connector evenly, and push down the tabs at each end. Both tabs must be fully locked down.
WN-5220-V Module Level Service Guide If this is true for the defective electronic controller board being replaced, you will need to remove the 3 sets of nuts and washers from the back of the new (replacement) electronic controller board prior to installation. Otherwise the new board will be overflexed in that area and may lead to premature failure. Make sure that the two black heatsinks remain with the parts referenced as U43 and U7.
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WN-5220-V Module Level Service Guide Optical Engine The optical engine contains the VideoWall’s illumination and imaging optics and the LCD.
Clarity Visual Systems The optical engine must have access from the rear of the display for full servicing. The LCD assembly has two vertical adjustment screws that can only be adjusted with the Lamp Access Cover removed. Without access to these two screws, it may not be possible to properly position an image on the screen. 1. Turn the lamp off Switch off the WN-5220-V using the remote and allow the cooling cycle to complete (3 – 4 minutes) before switching off the AC power at the rear-panel switch 2.
WN-5220-V Module Level Service Guide ∇ CAUTION Make sure that the LCD fans get reconnected and are operating. Failure to do so can lead to overheating of the LCD, resulting in a ruined LCD. When the new Optical Engine is installed it will be necessary to center the LCD image on the screen and adjust the size of the image. Optical Adjustment Process The LCD is initially centered and the image sized at the factory.
Clarity Visual Systems down. Go to the Test Patterns menu and move the cursor to the Geometry pattern. This is a white grid pattern on a black background that will define the edges of the LCD. For more information on the Service Menu see Service Menu on page 13. 7. Cover the front of the Screen Put a sheet of cloth, paper, cardboard or other nonscratching material over the front of the display.
WN-5220-V Module Level Service Guide Back View (filter off) Optically Sizing the Image The image must be properly sized to allow for proper alignment of video images across adjacent displays. When placing other displays adjacent to each other it is important that all displays have the same image size. If they don’t then the composite image won’t line up. The mullion around the edge of the screen covers approximately 3 lines of the image on each edge.
Clarity Visual Systems When adjusting the size of the image it is only necessary to adjust based on the vertical portion of the image. When the image is sized vertically, it should also be the correct size horizontally. ∇ WARNING Operating the WN-5220-V with access panels or the front screen removed can expose service or operating personnel to intense light, high electrical voltages and hot surfaces. Always wear ultraviolet-blocking eyeware with side guards when servicing the WN5220-V. 1.
WN-5220-V Module Level Service Guide LCD Assembly The LCD assembly may be accessed without removing the optical engine. Access to the front and rear of the VideoWall is required for this procedure. 1. Turn the lamp off Switch off the WN-5220-V using the remote and allow the cooling cycle to complete (3 – 4 minutes) before switching off the AC power at the rear-panel switch 2. Remove power cord Remove the AC power cord from the WN-5220-V 3. Remove the lamp 4. Remove the Screen 5.
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WN-5220-V Module Level Service Guide Power Supply The Power supply module contains the following items: • • • • • • • • • Fuse (in the AC Input Module) Power switch Voltage selector switch Fan relay Lamp Relay High voltage lamp power supply DC power supply AC line filter Cooling fan The easiest way to diagnose a power supply problem is to check the voltages on the cables coming from the Power Supply module.
Clarity Visual Systems The Power Supply module can be simply removed with the following process. 1. Turn the lamp off Switch off the WN-5220-V using the remote and allow the cooling cycle to complete (3 – 4 minutes) before switching off the AC power at the rear-panel switch 2. Remove power cord Remove the AC power cord from the WN-5220-V 3. Remove the Screen (front access) or Power Supply Access Cover (rear access) 4.
WN-5220-V Module Level Service Guide Mirrors Big Mirror When removing and replacing the Big Mirror it is advisable to have someone assist from the front to minimize the possibility of dropping the mirror on the other modules. 1. Turn the lamp off Switch off the WN-5220-V using the remote and allow the cooling cycle to complete (3 – 4 minutes) before switching off the AC power at the rear-panel switch 2. Remove power cord Remove the AC power cord from the WN-5220-V 3. Remove the Screen 4.
Clarity Visual Systems 5. Unscrew the 2 mounting screws on the front of the chassis Some displays were originally manufactured with 3 screws. Front View of Step Area Under Screen 6. Removed the Small Mirror Note the location of any washers that are between the Small Mirror and the chassis. Save these washers. When replacing the Small Mirror place any washers back in the same location as the were with the original mirror. Do not replace screw #3 in the front of the chassis.
WN-5220-V Module Level Service Guide Internal Cables Thermal Switch T Green (40") 11 Green (40") 8 Blue (40") Fan Control 9 Black (40") DC Gnd Yellow (38") Yellow (38") Violet 1 7 5 12 1 Interlock Connector 2 Controller Board 1 4 2 Lamp On P23 Fan/ Interlock Connector 4 Interlock J23 3 3 Fan On 1 1 Gnd +5V DC 2 2 +5V +5V DC 3 3 +5V (38") -5V DC 6 Black (38") DC Gnd Orange (38") +12V DC Black (38") DC Gnd Black (82") DC Gnd Black (48") DC Gnd 3 4
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WN-5220-V Module Level Service Guide Troubleshooting Power and Start-Up Problems When AC power is applied to the unit by turning on the main AC power switch, the unit enters a 3-minute standby-delay sequence. During this time, the STBY lamp on the rear panel flashes and the Lamp and Fan lamps are off. Also during this time, the unit does not respond to remote or manual controls and alerts you that it is locked by giving 3 short beeps when you press a button on the remote control.
Clarity Visual Systems Normal Power-Up Sequence Sequence Note Failure Symptoms At This Part Of The Sequence diagram, replace the Power Supply Module. • Replace the Electronics Module STBY LED comes on and then goes out and stays out • Cover the IR window on the Electronics Module with a piece of opaque tape to determine if the problem is due to too many stray IR signals • Replace the Electronics Module 4.
WN-5220-V Module Level Service Guide Normal Power-Up Sequence Sequence Note Failure Symptoms At This Part Of The Sequence remote • Replace the Electronics Module • Remove and reinstall LCD Cable • Replace the LCD Interconnect board • Replace the LCD Much of the preliminary diagnostics can be done by observing the 3 LED’s on the rear connector panel. Table 1 shows the LED combinations for the most likely failure modes.
Clarity Visual Systems Image Problems Follow these steps in order. Check Symptom Image is dim the operation of the VideoWall after each step. 1. Verify that the VideoWall has adequate ventilation and that the fans are working 2. 3.
WN-5220-V Module Level Service Guide Image is keystoned 1. 2. Check all mirrors and verify that they are securely attached If one is not, replace the defective mirror assembly Displayed image is too small or too large 1.
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WN-5220-V Module Level Service Guide Functional Tests Every display should be fully tested after it is repaired to verify that all features and functions are working properly. Take a few minutes to check everything thoroughly to insure that other problems won’t appear after you have left the customer’s site. Prior to starting these tests make sure that the Input Levels have been properly set. Color balance the display or make sure that the red, green and blue Color Balance numbers are all set to 31.
Clarity Visual Systems Test Video Mode Pattern or Image Pass Criteria VGA Data path VGA 256 shades of red, green and blue No blank or missing colors MAC II Data path MAC II 256 shades of red, green and blue No blank or missing colors 31.5K Video Data path 31.
WN-5220-V Module Level Service Guide These defects are defined as opaque defects that are not non-operational pixels. Scratches are usually in the laminated films on the LCD, on the input polarizer, or on the Fresnel lenses. Scratches can also be present on the screen itself. Blemishes are usually foreign material contamination in the laminated films. Dust and lint usually only cause a noticeable defect when on the LCD, Fresnels, or polarizers. d) Smudges.
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WN-5220-V Module Level Service Guide Index A Ac Line Filter ..........................................29 Air Filter ..............................................5, 11 Air Filter, Replacing ...............................11 B Big Mirror................................................31 C Cables .....................................................33 Centering The Lcd .................................23 Cleaning Mirrors ....................................12 Cleaning The Mirrors.............................
Clarity Visual Systems Mirrors, Cleaning ...................................12 Misc Control ...........................................13 Module Identification...............................5 O OEM Select .......................................15, 16 Optical Adjustment Process.................23 Optical Defect Specification .................42 Optical Engine Parts Of...............................................21 Optical Engine.... …5, 8, 21, 22, 23, 24, 25, 26, 27 Optically Sizing The Image ............
