Mitsubishi Electric Unisen LT-52151 User manual

• Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351JeronimoRoad,Irvine,CA 92618-1904
Copyright © 2009 Mitsubishi Digital ElectronicsAmerica, Inc.
AllRightsReserved
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCTSAFETYNOTICE" containedinthis manual.
SerSer
SerSer
Servicevice
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ManualManual
ManualManual
Manual
20092009
20092009
2009
MITSUBISHIELECTRIC
LCD FLAT PANEL TELEVISION
VLP41 / VLP41+ / VLP41++ CHASSIS
• Analog Output : AUDIO/SUBWOOFEROUTJACK
Level (RCAType)
-4.7dBm 4.7kΩ unbalanced
• Analog Input : VIDEOIN JACK (RCAType)
Level Y - 1.0Vp-p, Cr, Cb - 700mVp-p
75Ωunbalanced
•Digital : HDMITM 1.3 Inputs
Inputs/Outputs 480i, 480p, 720p, 1080i (60Hz)
1080p(24Hz, 30Hz, 60Hz)
: DigitalAudio Input (AC-3, PCM)
: DigitalAudio Output (AC-3, PCM)
: USB Input
: Direct IR Input/NetCommand Ouput
(V41+,V41++)
: RS-232c (V41++)
: Ethernet Wired Internet Connector
(V41++)
•HDMITM Digital PCCompatibilty
: 640 x 480, 898 x 480, 800 x 600,
1064 x 600, 1024 x768, 1280 x 720,
1365 x 768, 1280 x 1034 @ 60Hz,
1920 x 1080 @ 24Hz, 30Hz, 60Hz
VLP41 Chassis
LT-40151
LT-46151
LT-52151
Pb Solder
VLP41++ Chassis
LT-46249
LT-52249
SPECIFICATIONS
• Power Input :AC 120V, 60Hz
•Power Usage : See table on page 5
• Dimensions : See table on page 5
& Weight
• LCD Panel : Resolution - 1920 x 1080
: Refresh Rate - 120 Hz
• Tuning :Digital/AnalogTuner
(NTSC/ATSC/QAM)
• Tuning Range :AnalogCable- 1~125
Digital Cable - 1~135
•Antenna Input : 1 RF 75 Ohms unbalanced
• Speakers : 2W x 16 (V41/V41+)
: 2W x 16 & 20W x 2 (V41++)
VLP41+ Chassis
LT-40153
LT-46153
LT-52153
Lead-Free solder PWBs
LT-52249

• HDMI™is a trademark of HDMILicensing, LLC
• Dolbyand Dolby Digitalare registeredtrademarks of DolbyLaboratories.

Page 3
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
INTRODUCTION ................................................................................................................................5
Dimensions, Weight, etc. ...............................................................................................................5
PRODUCTSAFETY NOTICE ............................................................................................................. 5
SAFETY PRECAUTIONS .................................................................................................................6
DISASSEMBLY&PARTSREPLACEMENT ....................................................................................... 7
LCDPanelReplacement.................................................................................................................7
BackCover Removal .......................................................................................................................7
LCDStandRemoval ........................................................................................................................7
Speaker Cabinet Removal& Disassembly.......................................................................................8
BezelRemoval &Replacement .......................................................................................................9
WallMount BracketsRemoval ...................................................................................................... 10
StandMounting Bracket Removal .................................................................................................10
SideTerminal Removal & Disassembly ......................................................................................... 10
NET/MLAssemblyRemoval.......................................................................................................... 11
PWB-ML/POWERReplacment..................................................................................................... 11
PWB-NET/MLReplacment ........................................................................................................... 12
PowerAssemblyRemoval............................................................................................................. 12
PWB-POWERReplacment........................................................................................................... 12
MainAssembly Removal............................................................................................................... 13
PWB-MAINReplacment ............................................................................................................... 13
Top, Bottom & Side Brackets Removal ......................................................................................... 14
TopStayRemoval ......................................................................................................................... 14
LCD Panel Replacement Final Steps - Wiring and Wiring Clamps................................................. 15
INITIALIZATION, INITIAL SETTINGS & TROUBLESHOOTING....................................................... 19
RemoteControl............................................................................................................................. 19
OptionMenu ................................................................................................................................. 20
Resetand Initialization .................................................................................................................. 20
Initial Settings ............................................................................................................................... 21
A/V Reset..................................................................................................................................... 22
Backup / Restore ISF Settings ..................................................................................................... 23
LED Indications & Self Diagnostics............................................................................................... 24
ErrorCodes .................................................................................................................................. 25
ErrorCodeLog.............................................................................................................................. 25
SounProjectorTransducerTest .................................................................................................... 25
USINGLEAD FREE SOLDER .......................................................................................................... 26
CHIPPARTSREPLACEMENT ......................................................................................................... 27
REPLACEMENTPARTS .................................................................................................................. 28
PartsOrdering .............................................................................................................................. 28
Criticaland WarrantyParts Designation........................................................................................28
PartsTolerance Codes.................................................................................................................. 28
Quick Reference List...................................................................................................................... 29
SERVICE PARTS LIST .................................................................................................................... 30
CONTENTS

Page 4
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
CIRCUITRYBLOCK DIAGRAMS ..................................................................................................... 37
PowerSupplyOverview ................................................................................................................. 37
5VSLSource ................................................................................................................................ 38
5VSLDistribution.......................................................................................................................... 39
+340VSource............................................................................................................................... 40
PWB-ML-POWER ........................................................................................................................ 41
OVINV, 12VS & PANEL-VCC Sources.......................................................................................... 42
12VSDistribution (1/2) .................................................................................................................. 43
12VSDistribution (2/2) .................................................................................................................. 44
Signal Path ................................................................................................................................... 45
SystemControl............................................................................................................................. 46
SCHEMATICDIAGRAMS

Page 5
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
INTRODUCTION
Thisservice manual provides service instructions for LCD Flat Panel TV Models and Chassis:
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety related characteristics. These charac-
teristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by
usingreplacement componentsrated for higher voltage, wattage, etc.
Replacementparts which have special safety characteristics are identified in this service manual.
Electrical components having such features are identified by shading on the schematic diagram and parts list of this
service manual. Therefore, the replacement for any safety part should be identical in value and characteris-
tics.
Pb Solder
The PWBs used in thischassis are constructed using Lead-Free solder. When servicing use
only recommended Lead-Free solder.
NORMAL STANDBY
LT-40151 VLP41 25.1" 26.4" 36.7" 2.9" 12.9" 52.9 lbs 230W 0.4W
LT-40153 VLP41+"""""" " "
LT-46151 VLP41 28.1" 29.4" 42" " " 62.4 lbs 280W "
LT-46153 VLP41+"""""" " "
LT-46249 VLP41++ " " " 3" " " " "
LT-52151 VLP41 31.5" 32.8" 47.7 3.5" " 80.9 lbs 295W "
LT-52153 VLP41+"""""" " "
LT-52249 VLP41++ " " " 3.6" " " " "
Dimensions, Weight & Power Consumption
MODEL CHASSIS HEIGHT HEIGHT
w base WIDTH DEPTH DEPTH w base WEIGHT w base POWER USAGE

Page 6
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
Leakage current check
Before returning the receiver to the customer, it is recommended that leakage current be measured according to the
followingmethods.
1. Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug
prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal part
(i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particularly any
exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts having a
return path to the chassis should be a minimum of 1Meg Ohm. Any resistance below this value indicates an
abnormalconditionand requires correctiveaction.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after
connection, andwith the switching devices of the receiver in their operating positions,measure the
leakage current for both positions of switch S2.
2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the
switchingdevices of the receiver in their operating positions, measure the leakage current forboth
positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has
reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).
SAFETY PRECAUTIONS
NOTICE: Observeall cautions andsafety related noteslocated inside thereceiver cabinet and on the receiver
chassis.
WARNING:
1. Operationof this receiver outsidethe cabinet or with the cover removed presents a shock hazard from the
receiver's power supplies. Work on the receiver should not be attempted by anyone who is not thoroughly
familiarwith the precautions necessary when working onhigh voltage equipment.
2. Donot install, remove or handle the LCD panel in any manner unless shatterproof goggles are worn. People
not so equipped should be kept away while the panel is being handled. Keep the panel away from the body
whilehandling.
3. Whenservice is required, observe the original lead dress. Where a short-circuit has occurred, replace those
componentsthat indicate evidenceof overheating.
4. If the LCD Panel is damaged, crystalline liquid may leak from the LCD panel and broken glass may be
scattered. The crystalline liquid is toxic. Avoid contact with your skin, eyes, or mouth. DO NOT touch the
broken glass or crystalline liquid with bare hands, as cuts, poisoning, and/or skin irritation may occur. DO
NOT let glass fragments or crystalline liquid get into your eyes or mouth. Should either contact your eyes or
mouth, rinse the contacted area thoroughly with water and consult your doctor.
5. The fluorescent tubes in the panel contain mercury that is toxic and if broken should not be touched.
6. DO NOT dispose of the TV with general household waste. Follow local laws and regulations for legal and
safe disposal of theTV. For disposal or recycling information, contact local authorities or the Electronic
IndustriesAllianceat www.eiae.org.
GWG - Green Wire Ground
(Earth Ground)
S2
S1
OPEN
GROUND
SUPPLY CONNECTOR GROUND
RECEIVER
INSULATED TABLE
TOUCH ALL
EXPOSED
METAL PARTS
AC MA
METER
L
N

Page 7
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
Back Cover Removal**
NOTE: Itis notnecessary to remove the Standfor Back Cover removal.
1) Removeshort screws(A) andlong screws (B).
2) Lft the back cover from the TV.
DISASSEMBLY
Stand Removal**
NOTE: TheStandcanberemoved either beforeor
afterBackCoverremoval.
1) Lay the TV face down on a soft flat surface.
2) Removescrews (C)and lift out.
NOTE: Unless noted, instructions are for all models.
Illustrationsmay differ slightly depending uponthe actualmodel being serviced.
LCD Panel Replacement
1) Removethe partsnoted with**.
2) Reversethe procedureto install areplacement.
A
A
A
B
B
B
C
DISASSEMBLY & PARTS REPLACEMENT

Page 8
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
Speaker Cabinet Removal**
1) Disconnect all electrical connectors to the Speaker Cabinet.
2) Removescrews (A).
3) Liftthe SpeakerCabinet from theTV.
Screen Size Screw Quantity
52" 10
46" 8
40" 6
Speaker Cabinet Disassembly (LT-40151, LT-46151, LT-52151, LT-46153 & LT-52153)
1) GRILL-REAR- Remove screws (B).
2) PreampAssembly- Remove screw (C).
3) LEDAssembly- Remove screw (D).
4) PLATE-LED -Removescrews (E).
DISASSEMBLY & PARTS REPLACEMENT
(CONTINUED)
B
ORNAMENT
B
E
NET-SP
GRILL-REAR
PWB-PREAMP
PLATE-IR
C
LENS-IR
PLATE-LED
D
PWB-LED
COVER-LED
GRILL-SP
SPEAKER-2W PAD-SP
SPEAKER
A
A
46" 40"
52" AA46"
52"
CABINET
40"

Page 9
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
Speaker Cabinet Disassembly (LT-46249 & LT-52249)
1) GRILL-REAR- Remove screws (B).
2) PreampAssembly- Remove screw (C).
3) LEDAssembly- Remove screw (D).
4) SPEAKER(S)- Removescrews (E).
DISASSEMBLY & PARTS REPLACEMENT
(CONTINUED)
B
ORNAMENT-SP
PWB-
PREAMP
LENS
IR PLATE
IR
B
C
D
SPEAKER
GRILL-SP
GRILL-REAR
NET-SP
SPEAKER-2W PAD-SP
LENS-LED
PWB-SBL
PLATE-
LED
PWB-LED
E
HOLDER-SP
BEZEL-FRONT Removal**
1) Removethe SpeakerCabinet.
2) Release the clips arond the sides and top of the Bezel and lift away from the front of the LCD Panel .
BEZEL-FRONT Replacement (LT-40153, LT-46153, LT-52153, LT46249, LT-52249)
1) Applydouble facedadhesive tape along the inside top, bottom and sides of thePanel-Front.
2) Use even pressure to mate the Panel-Front to the Bezel.
DF-ADHESIVE-TAPE
PANEL-FRONT

Page 10
MODELS: LT-40151 / LT-46151 / LT-52151 / LT-40153 / LT-46153 / LT-52153 / LT-46249 / LT-52249
Wall Mount Brackets Removal**
1) Removescrews (A).
2) Lift off the Wall Mount Brackets.
Stand Mounting Bracket Removal**
1) Removescrews(D).
2) Lift off the Stand Mounting Bracket.
DISASSEMBLY & PARTS REPLACEMENT
(CONTINUED)
AC Power Jack Removal**
1) Removescrews (B) and(C).
2) Disconnectelectrical connector.
3) Lift off theAC POWER JACK.
Side Terminal Removal**
1) Disconnect all electrical connectors to the Side Terminal.
2) Slide the Side Terminal out of the TV.
Side Terminal Disassembly
1) HDMICable - Removescrews (E).
2) PWB-SIDE& BUTTON-SIDE -Removescrews (F).
A A WALL MOUNT
BRACKETS
ASTAND
BRACKET
MOUNTING
D
BC AC POWER
JACK
E
USB CABLE
PWB-SIDE BUTTON-SIDE
SIDE TERMINAL
F