Panasonic TX-22LT2 User manual

ORDERNO. ITD0110014C2
22”LCD TV
TX-22LT2
LH4Chassis
SPECIFICATIONS
PowerSource
AC100~240V, 50/60Hz
PowerConsumption
Averageuse:69W (Maximumcurrent0.7A)
Stand-bycondition:4W (at120-240V)
TVset
DC15V, 4.1Amax.
LCD
22-inch, 16:9aspectratio LCDpanel
Screen Size
487mm(W)x274mm(H)
Receiving System
PAL I, PAL-525/60, M. NTSC
NTSC(AVonly)
Receiving Channel
UHF E21 -E65
Sound
Speaker
Tweeter(4x7cm 2pcs, 8 ), Woofer( 5cm 2pcs, 4 )
Audio Output
9W (2.5W+2.5W+4.0W (Woofer)), 10%THD, 50Hz~20kHz
Headphones
M3(3.5mm)Jack x1
1

FEATURES
3DY/CDigital comb Filter
Aero-Hammer DoubleWooferSystem (2Way
4SpeakerSystem)
CLOSEDCAPTION V-Chip
Accessories Supplied
Remotecontrol TransmitterN2QAFC000006
Battery:CR2025 x1
ACAdaptor:N0JZHK000004
ACCord:K2CA2EA00005
Operating Conditions
Temperature:41°F-95°F(5-35°C)
Humidity:5%-90%RH(non-condensing)
Connection Terminals
Video In
VIDEO
RCAPINTypex2 1.0Vp-p
S-VIDEO
Mini DIN4-pin x2 Y:1Vp-p(75 ), C:0.286Vp-p(75 )
AUDIOL-R
RCAPINTypex2 1.0Vp-p
COMPONENTINVIDEO
DTypeConnecterx
2Y, PB, PR
AUDIOL-R
RCAPINTypex2 0.5Vrms
AUDIOOUT
M3Stereo Jack x1 0.5Vrms
Dimensions(W xDxH)
Including TVStand
586mm x240mm x424mm
TVSetOnly
586mm x67mm x388mm
Weight(Mass)
11.5kg Net
Note:
Design and Specificationsaresubjectto changewithoutnotice.
Weightand Dimensionsshown areapproximate.
2000 Matsushita ElectricIndustrial Co., Ltd. All rights reserved.
Unauthorizedcopying and distribution isaviolation oflaw.
2

1. SafetyPrecautions
1.1. General Guidelines
1. Whenservicing, observetheoriginal leaddress. Ifashortcircuit
isfound, replace all parts whichhavebeenoverheatedor
damagedbytheshortcircuit.
2. Afterservicing, see toitthat all theprotectivedevices suchas
insulation barriers, insulation papersshieldsareproperlyinstalled.
3. Afterservicing, make thefollowing leakagecurrentchecks to
preventthecustomerfrombeing exposedtoshock hazards.
1.2. Touch-CurrentCheck
1. Plug theACcorddirectlyintotheACoutlet. Donotuse an
isolation transformerforthischeck.
2. Connect ameasuring networkfortouchcurrents betweeneach
exposedmetallicparton theset and agood earthground suchas
awaterpipe, as showninFigure1.
3. Use LeakageCurrentTester(Simpson 228 orequivalent) to
measurethepotential across themeasuring network.
4. Check eachexposedmetallicpart, and measurethevoltageat
eachpoint.
5. ReservetheACplug intheACoutlet and repeat eachoftheabove
measure.
6. Thepotential at anypoint(TOUGHCURRENT)expressedas
voltageU1and U2, does notexceedthefollowing values:
Fora. c.:U1=35 V(peak) and U2=0.35 V(peak);
Ford. c.:U1=1.0V,
Note:
ThelimitvalueofU2=0.35 V (peak)for a. c. and U1=1.0V for d. c. correspond tothevalues 0.7
mA(peak)a. c. and 2.0mAd. c.
ThelimitvalueU1=35 V (peak)for a. c. correspond tothevalue70 mA(peak)a. c. for
frequencies greaterthan100 kHz.
7. Incase ameasurementisoutofthelimits specified, thereisa
possibilityofashock hazard, and theequipmentshouldbe
3

repairedand recheckedbeforeitisreturnedtothecustomer.
Figure1
2. Prevention of ElectroStaticDischarge (ESD) to
ElectrostaticallySensitive(ES) Devices
Somesemiconductor (solidstate)devices canbedamagedeasilybystaticelectricity. Such
componentscommonlyarecalledElectrostaticallySensitive (ES)Devices. Examples oftypical
ES devices areintegratedcircuitsand somefield-effecttransistorsand semiconductor "chip"
components. Thefollowing techniques shouldbeusedtohelpreduce theincidence of
componentdamagecausedbyelectro staticdischarge(ESD).
1. Immediatelybeforehandling anysemiconductorcomponentor
semiconductor-equippedassembly, drainoff anyESDon your
bodybytouching aknownearthground. Alternatively, obtainand
wearacommerciallyavailabledischarging ESDwrist strap,
whichshouldberemovedforpotential shock reasonspriorto
applying powertotheunitundertest.
2. Afterremoving anelectrical assemblyequippedwithES devices,
place theassemblyon aconductivesurface suchas alminumfoil,
topreventelectrostaticchargebuildup orexposureofthe
assembly.
3. Use onlyagrounded-tipsoldering iron tosolderorunsolderES
devices.
4. Use onlyananti-staticsolderremoval device. Somesolder
removal devices notclassifiedas "anti-static(ESDprotected)"can
4

generate electrical chargesufficienttodamageES devices.
5. Donotuse freon-propelledchemicals. These cangenerate
electrical charges sufficienttodamageES devices.
6. DonotremoveareplacementES device fromits protective
packageuntil immediatelybeforeyou arereadytoinstall it. (Most
replacementES devices arepackagedwithleadselectrically
shortedtogetherbyconductivefoam, alminumfoil or
comparableconductivematerial).
7. Immediatelybeforeremoving theprotectivematerial fromthe
leadsofareplacementES device, touchtheprotectivematerial to
thechassisorcircuitassemblyintowhichthedevice will be
installed.
Caution
Besureno powerisappliedtothechassisorcircuit, and observe
all othersafetyprecautions.
8. Minimizebodilymotionswhenhandling unpackagedreplacement
ES devices. (Otherwise hamless motion suchas thebrushing
togetherofyourclothes fabricorthelifting ofyourfootfroma
carpetedfloorcangenerate staticelectricity(ESD)sufficient
todamageanES device).
3. Self Check
1. Self-Check isusedtoautomaticallycheck thebuslines and
hexadecimal codeoftheTVset.
2. To get intotheSelf-Check modepress theDown( )
button on thecustomercontrolsat thefrontoftheset, at thesame
timepressing theRecall button on theremote control, andthe
screenwill show :
5

IftheCCU portshave beencheckedand found tobeincorrector notlocatedthen“--”will appear
inplace of“O.K.”.
4. ChasisBoardLayout
6

5. Servicing method
5.1. Removing tiltbase
7

5.2. Removing rearpanel
5.3. Removing speakerunit
8

5.4. Removing chassis
9

5.5. Removing A-Board
10

11

5.6. Removing B-Board(withtunerassembly)
5.7. Removing DG-Board
12

5.8. Removing H1-Boardand H2-Board
5.9. Removing P1-Board
5.10. Removing P2-Board
13

5.11. Removing K-Board
5.12. Removing V-Board
5.13. A-Boardservicing
14

6. Service Mode Function
MPUcontrolsthefunctionsswitching for eachIICsthrough IICbusinthischassis. Thefollowing
setting and adjustmentcanbeadjustedbyremotecontrol inService Mode.
6.1. How toenterSERVICE1
1. Insound menu, set BASS toMAX/MUM, and set TREBLEto
MINIMUM.
2. Simultaneouslypress INDEX button on remote control and DOWN
button [ ]on theTVset.
6.2. How toenterSERVICE2
1. Set thechannel toCH99.
2. Press HOLDbutton on remote control.
Note:
To exittoService mode, press NorPowerbutton on remote control.
15

6.3. Option Description
16

17

7. ConductorViews
7.1. A-Board
7.2. B, H1, H2, K, P1and P2-Board
7.3. DG-Board
8. Block and SchematicDiagrams
8.1. SchematicDiagramNotes
18

8.2. PowerBlock Diagram
8.3. Signal Block Diagram
8.4. Interconnection SchematicDiagram
8.5. A-Board(1 of5) SchematicDiagram
8.6. A-Board(2 of5) SchematicDiagram
8.7. A-Board(3 of5) SchematicDiagram
8.8. A-Board(4 of5) SchematicDiagram
8.9. A-Board(5 of5) SchematicDiagram
8.10. DG-Board(1 of5) SchematicDiagram
8.11. DG-Board(2 of5) SchematicDiagram
8.12. DG-Board(3 of5) SchematicDiagram
8.13. DG-Board(4 of5) SchematicDiagram
8.14. DG-Board(5 of5) SchematicDiagram
19

8.15. P1-BoardSchematicDiagram
8.16. B, K, V, and P2-BoardSchematicDiagram
8.17. H1and H2-BoardSchematicDiagram
9. PartsLocation &Mechanical Replacement Parts
List
9.1. Parts Location
9.2. Packing ExplodedView
20