HITACHI LCD Projection Television TrainingInstructor: Alvie Rodgers C.E.T.

Service PolicyThe LCD Projection Television service police is; "Board Level Repair". It's not necessary for a PWB tobe replaced if there can be found a simple repair. PWBs and the Engine does not require Authorization to order. NOTE: When returning a PWB that has been replaced, there is a form that comes with the replacement PWB. Please fill this form on completely.

Model NumberChassis Number50V500LC3750V500ALC37E60V500ALC37F50VX500LC37E60VX500LC37F

Service Policy Board Part Numbers

PWBLC-3750V500LC-37E50V500A, 50VX500LC-37F60V500A, 60VX500Main Chassisp/n UE22341p/n UE22343p/n UE22344Engine Assemblyp/n UX22201p/n UX22202p/n UX22203Front Control Sub PWBp/n X480273Comes with Ft ControlComes with Ft ControlFront Control PWBp/n JT24171p/n JT24173p/n JT24173LED PWBp/n X480274Comes with Ft ControlComes with Ft ControlSignal PWBp/n JT24141p/n JT24143p/n JT24144Terminal PWBp/n JT24151p/n JT24153p/n JT24154Power PWBp/n JT24161p/n JT24163p/n JT24164FC Unit (Flex Control Unit)p/n CS00771p/n CS00771p/n CS00772Drive PWBp/n JP06781p/n JP07191p/n JP07191AUDIO PWBp/n X480263p/n X480266p/n X480265Memory Card Reader or Bridge Mediap/n CS00761p/n CS00761p/n CS00761Lamp Ballast (Lamp Power)p/n HA01232p/n HA01232p/n HA01232DVI PWBp/n JT24251p/n JT24253p/n JT24254OTHER COMPONENTSTop Fan (Lamp Fan)p/n UX21521p/n UX21521p/n UX21521Top Fan with Fan Duct (Housing)p/n UX21521p/n UX21521p/n UX21521Bottom Fan (Engine Fan)p/n GS00931p/n GS00931p/n GS00931Lamp (Service Lamp)p/n UX21511p/n UX21511p/n UX21511Door Switch PWBp/n X480272Comes with Ft ControlComes with Ft ControlPower Switch PWBp/n X480271Comes with Ft ControlComes with Ft ControlThermal Switchp/n UF00051Up/n UF00051Up/n FH00051U

PWB Return Form

Basic: Light PathLCD Liquid Crystal light "Valve".

LCD Liquid Crystal light Path".

Front and Rear Inputs

Top Removal Cabinet Front View

Top Removal Speaker GrillPop Off Speaker Grill Remove 4 screws holding front plastic piece with power button.

Top Removal Speaker Grill Left SideLeft Side Close up view.

Top Removal Speaker Grill Right SideRight Side Close up view.

Top Removal Upper CabinetRemove 4 screws holding top cabinet front.

Top Removal Upper Cabinet Left SideLeft Side Close Up View

Top Removal Upper Cabinet Right SideRight Side Close Up View

Top Removal SubwooferPull out subwoofer as shown,to access the upper cabinet wires.

Top Removal Control Panel WiringDisconnect all the wires. Pay special attention to the Wire Dress and how these wires are dressed inside the cavity behind the Sub Woofer. Cavity seen in the above picture. Pay special attention to removing the Power Switch connector. Sometimes this can be overlooked.

Top RemovalNow lift the top straight up. (2 person lift!)

Top RemovedThis picture show the LCD Projector with the Top Cabinet removed. Lamp door and Lamp also removed. Reassembly by reverse procedure

REASSEMBLY PROCEDURE NOTES REINSTALLING THE SUB WOOFER:BOTTOM BACK COVER INSTALLATION:

Engine Removal Back BracketRemove this bracket. 4 screws. (6 total),but top 2 have already been removed when the top cabinet assembly was removed.

Engine Removal Back Bracket RemovedBracket Removed

Engine Removal BallastRemove the Ballast Assy. (4 screws). Pay close attention to the wire dress

Engine Removal Ballast Power ConnectorThis shows the Ballast and Exhaust screen assembly which has been swung over to the right to reveal the Lamp ballast wires. Remove Lamp Power Connector retaining bracket, then Lamp Power Connector.(1 screw). After metal retaining clip is removed, pull wires straight back and out.

Engine Removal Exhaust PortRemove Fan Exhaust Housing (back screw is hidden in this view) (2 screws).

Engine Removal Exhaust Port Hidden ScrewAnother view of Fan Exhaust housing, showing hidden black screw. Pay attention to this removal process as re-assembly can be slow with unfamiliarity.

Engine Removal Lamp SwitchRemove Lamp Switch PWB. (2 screws).Note just above this switch is the Air Duct Temperature sensor. This switch is normally "open" until a high temperature is sensed. Then it closes.

Engine Removal Base ScrewsRemove the 5 screws holding down the Engine Assy. Use a stubby #2 Philips head as needed.

Engine Removal Base Screws Other SideRemove the 5 screws holding down the Engine Assy.

Engine Removal Upper BracketRemove upper bracket, so Engine assembly can be pulled out the back. During this process, you must pay very close attention to the Wire Dress. All wires routed from the back left to the back right side are held in place by wire dress clips. When re-installing this bracket, the wires must be dressed back into their original placement.

Engine Removal Upper Plastic Covers LeftRemove the Left and Right hand top plastic covers around the Lens.

Engine Removal Upper Plastic Covers RightRemove the Left and Right hand top plastic covers around the Lens.

Engine Removal Upper Plastic CoverRemove the plastic cover around the Lens.

Engine Removal Signal PWB RemovalTo make the engine removal procedure easier, disconnect all connectors on the Signal PWB and slide it back and out. This will free up room to manipulate the engine during removal.

Engine Removal Top ViewSome Connectors must be removed.

Engine RemovedThis picture shows the New replacement Engine assembly on top. Here you can see the engine assembly comes complete with all necessary PWBs, fans and sensors to allow operation. It does not come with a new Lamp Switch.

Engine ReassemblyTo install new Engine Assembly, Reassemble in reverse order of disassembly. To remove the old engine, lift it straight up and then pull the left hand side to the rear first.

ENGINE PART NUMBERS: 50V500A = UX22202 50VX500 = UX22202 60V500A = UX22203 60VX500 = UX22203 Re-installation notes:Care must be taken with installation and wire dress. Careful notice during disassembly should have been taken to observe the wire dress.

Power Supply PWB Layout

Power Supply Shut Down Diagram

Power Supply Shut Down PROT_SW

Power Supply Shut Down PROT_SW2

Video Signal Path NTSC

Video Signal Path Component

PWB Function Ft Control

PWB Function Ft Control

Sheet1

Front Control PWBThe PWB contains the function switches. Power, Channel Up/Down, Volume Up/Down, Avx, Menu. Also the front LEDs are visible here. Power LED, Card Reader LED, Temperature Sensor LED and Lamp LED.

INDICATORINDICATIONMEANINGACTION

LAMP LEDLIGHT ONNO LAMP LIGHT OR LAMP BROKENNeed to replace the lamp if lamp still doesn't light after next power on, check the assembly of Lamp unit.

LIGHT BLINKINGWRONG LAMP LIGHT ASSEMBLY OR LAMP DOOR OPEN.

TEMP LEDLIGHT ONTOO HOT INSIDE THE OPTIC ASSEMBLY.Call for Service

BLINKINGCOOLING FAN STOPPED.

POWER LEDLIGHT ONNORMAL OPERATION.

SLOWLY BLINKINGUNIT COOLING DOWN.

If the LAMP, TEMP and POWER are blinking in this order, the unit is warming up.

PWB Function Signal PWB

PWB Function Drive, LCD, Audio PWB

PWB Function Memory Card, Lamp Ballast, Temp Sensor, Door Switch, DVI PWB

Lamp Replacement Warnings

Lamp Replacement 1

Lamp Replacement 2

Lamp Replacement 3

Lamp Replacement 4

Lamp Replacement 5

Lamp Replacement 6NOTE: IF POWER IS CONNECTED BEFORE THE LAMP COVER IS INSTALLED, THE POWER WILL BE OFF AND THE LAMP INDICATOR WILL FLASH (See Front LED Explanation).

Lamp Replacement 7

Lamp Replacement 8

Next, remove the Ballast Assy. (4 screws). Pay close attention to the wire dress as they will have to be returned to their original placement during re-assembly.After the screws are removed, swing the ballast and exhaust screen assembly back and to the right to gain access to the the ballast wires going to the Lamp.

Note there is also some "FOAM" that surrounds the Lens assembly that's not shown here. This foam can slip up and into the Light Path and cause shadows in the bottom corners of the picture. Please see Known Fixes for details.Note there is also some "FOAM" that surrounds the Lens assembly that's not shown here. This foam can slip up and into the Light Path and cause shadows in the bottom corners of the picture. Please see Known Fixes for details.This picture shows the engine top view. Identifies the Flex Converter, the Drive PWB, the Audio PWB and the Engine Fan p/n GS00506. There's another fan not shown here that's located on the bottom of the engine. This Fan is the Lamp Fan p/n GS00931. The fans are replaceable. There's a cover (dust filter) over the bottom Lamp Fan that can come loose or be accidentally pushed in and may make contact with the bottom fan. Be careful when installing the new fan so as not to push in this filter.The connectors on the Flex Converter and Drive PWBs must be removed if they leave the Engine Assembly. Some do not. Example: The white flat ribbon cable shown below on the right hand side of the Flex Converter goes down to the Signal PWB. Be careful with this connector as it is fragile. The lock mechanism is also fragile. It simply snaps up to unlock and down to lock. There's a blue strip on the ribbon cable at each end. This blue strip goes away from the contacts and towards the lock mechanism. If too much pressure is applied to the lock mechanism, it may pop off the connector and fall. If you find the lock mechanism is missing, look around inside the cabinet for this brown lock mechanism and re-install. There are many symptoms that can occur when this ribbon cable is loose or improperly connected. See Know Fixes for some details.\This picture shows the engine top view. Identifies the Flex Converter, the Drive PWB, the Audio PWB and the Engine Fan p/n GS00506. There's another fan not shown here that's located on the bottom of the engine. This Fan is the Lamp Fan p/n GS00931. The fans are replaceable. There's a cover (dust filter) over the bottom Lamp Fan that can come loose or be accidentally pushed in and may make contact with the bottom fan. Be careful when installing the new fan so as not to push in this filter.The connectors on the Flex Converter and Drive PWBs must be removed if they leave the Engine Assembly. Some do not. Example: The white flat ribbon cable shown below on the right hand side of the Flex Converter goes down to the Signal PWB. Be careful with this connector as it is fragile. The lock mechanism is also fragile. It simply snaps up to unlock and down to lock. There's a blue strip on the ribbon cable at each end. This blue strip goes away from the contacts and towards the lock mechanism. If too much pressure is applied to the lock mechanism, it may pop off the connector and fall. If you find the lock mechanism is missing, look around inside the cabinet for this brown lock mechanism and re-install. There are many symptoms that can occur when this ribbon cable is loose or improperly connected. See Know Fixes for some details.\This picture shows the engine top view. Identifies the Flex Converter, the Drive PWB, the Audio PWB and the Engine Fan p/n GS00506. There's another fan not shown here that's located on the bottom of the engine. This Fan is the Lamp Fan p/n GS00931. The fans are replaceable. There's a cover (dust filter) over the bottom Lamp Fan that can come loose or be accidentally pushed in and may make contact with the bottom fan. Be careful when installing the new fan so as not to push in this filter.The connectors on the Flex Converter and Drive PWBs must be removed if they leave the Engine Assembly. Some do not. Example: The white flat ribbon cable shown below on the right hand side of the Flex Converter goes down to the Signal PWB. Be careful with this connector as it is fragile. The lock mechanism is also fragile. It simply snaps up to unlock and down to lock. There's a blue strip on the ribbon cable at each end. This blue strip goes away from the contacts and towards the lock mechanism. If too much pressure is applied to the lock mechanism, it may pop off the connector and fall. If you find the lock mechanism is missing, look around inside the cabinet for this brown lock mechanism and re-install. There are many symptoms that can occur when this ribbon cable is loose or improperly connected. See Know Fixes for some details.\The lamp gets very hot! The lamp may explode if improperly handled. To avoid injury, please observe the following precautions.Do not open lamp compartment or attempt to remove lamp assembly unless the lamp assembly is being replaced. Unplug the products power cord from the AC outlet before attempting to replace the lamp assembly. If the lamp is in use when failure occurs or if the lamp has exploded, wait at least 30-45 minutes for the lamp to cool before opening the lamp compartment or touching the lamp assembly or any broken pieces. Broken lamp pieces can cause injury. Handle with gloves to avoid cuts. Do not place any foreign objects inside the lamp compartment. When installing a new lamp, follow handling instruction included with the new lamp. Do not touch glass surface of new lamp. The lamp in this product contains Mercury. Dispose of properly in accordance with applicable environmental laws. For Recycling and Disposal information, contact your respective governmental agencies or the Electronic Industries Alliance at www.eiae.org (in the U.S.) or Electronic Product Stewardship Canada at www.epsc.ca (in Canada). CAUTION!A "LAMP" indicator will light when lamp becomes hot. Unplug products power cord from the AC outlet and allow lamp to cool for at least 30-45 minutes. If "LAMP" indicator is still lit, check the lamp unit assembly.NOTES:Contact your Hitachi dealer for a new lamp unit. Using other lamps may cause damage to the TV Set. TYPE NAME: LC37 LAMP ASSEMBLY PART NUMBER: UX21511When replacing the lamp, let it cool down completely, for approximately 30 to 45 minutes after the power has been switched off and A.C. cord has been unplugged. Do not touch the glass of the new lamp or make it dirty which can shorten the life of the lamp and reduce the picture quality. Keep the lamp out of the reach of children and away from flammable materials. Do not pour water onto the removed lamp or put any object inside the lamp. Once the lamp is removed, do not put flammable materials and metal objects inside the lamp receptacle on the TV set. Do not touch the receptacle. Install the new lamp securely, otherwise the picture may become dark or it may cause severe overheating. Install the lamp cover correctly, otherwise power will not come on. The lamp in this product contains Mercury. Dispose of properly in accordance with applicable environmental laws. For Recycling and Disposal information, contact your respective governmental agencies or the Electronic Industries Alliance at www.eiae.org (in the U.S.) or Electronic Product Stewardship Canada at www.epsc.ca (in Canada).