Toshiba 37WL68P User manual

SERVICE MANUAL

LCDColor Television

37WL68P Ver.1

Thismodelis classified as a green product

(*1), as indicated by the underlined serialnumber.

ThisService Manualdescribes replacementpartsforthe green product. When repairing this

green product, usethe part(s)described in this manualand lead-free solder (*2).

For(*1)and (*2), referto GREENPRODUCTPROCUREMENT and LEAD-FREE

SOLDER.

©TOSHIBACORPORATION

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GREEN PRODUCT PROCUREMENT

The ECis actively promoting the WEEE &RoHS Directivesthatdefine standards for

recycling and reuseofWaste Electricaland Electronic Equipmentand forthe Restriction of

the use ofcertain HazardousSubstances. FromJuly 1, 2006, the RoHS Directive will

prohibitany marketing ofnewproducts containing the restricted substances.

Increasing attention is given to issues related to the globalenvironmental. Toshiba

Corporation recognizes environmentalprotection as a key managementtasks, and is doing its

utmostto enhance and improve the quality and scopeofits environmentalactivities. In line

with this, Toshibaproactively promotes GreenProcurement, and seeks topurchase and use

products, parts and materials thathave lowenvironmentalimpacts.

Green procurementofparts isnotonly confined to manufacture. The same green parts used

inmanufacture mustalso beused asreplacementparts.

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LEAD-FREE SOLDER

Thisproductis manufactured using lead-freesolderas apartofa movementwithinthe

consumerproducts industry atlarge to beenvironmentally responsible. Lead-

freesoldermust

be used in the servicing and repairofthisproduct.

The melting temperatureoflead-freesolderishigherthan thatofleaded solderby 86 F to

104 F (30 Cto40 C). Useofa soldering iron designed forlead-based solders to repair

productmade with lead

free soldermayresultin damage to the componentand orPCB being

soldered. Greatcareshould bemadeto ensure high-quality soldering when servicing this

productespecially when soldering large components, through

-hole pins, and on PCBs asthe

levelofheatrequired to meltlead-free solderishigh.

WARNING: Thisproductismanufacturedusing lead free solder.

DONOTUSELEADBASEDSOLDER TOREPAIRTHISPRODUCT!

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SAFETY INSTRUCTION

SafetyPrecaution

1.An isolation transformershould be connected in the powerlinebetween the receiver

and the ACline before any service is performed on the receiver.

2.Always disconnectthe powerplug before any disassembling ofthe product. It may

resultin electricalshock.

3.When replacing a chassisin thecabinet, always be certain thatallthe protective

devices are putback in place, such as nonmetallic controlknobs, insulating covers,

shields, isolation resistor-capacitornetwork, etc.

Always keep tools, componentsoftheproduct, etc away fromthe children, These items

may causeinjury to children.

5.Depending on the model, use an isolation transformerorwearsuitable gloves when

servicing with the poweron, and disconnectthepowerplug to avoid electricalshock

when replacing parts. In somecases, alternating currentis also impressed in the

chassis, so electricalshock ispossible ifthe chassis is contacted withthe poweron.

6.Always usethe replacementpartsspecified fortheparticularmodelwhen making

repairs. The parts used in products requirespecialsafety characteristicssuch as

WARNING: BEFORESERVICINGTHISCHASSIS,READ THE "SAFETY

PRECAUTION"AND"PRODUCTSAFETYNOTICE"INSTRUCTIONSBELOW.

WARNING: SERVICINGSHOULDNOTBEATTEMPTEDBYANYONE

UNFAMILIARWITHTHE NECESSARYPRECAUTIONSON THISRECEIVER.

THE FOLLOWINGARE THE NECESSARYPRECAUTIONSTOBEOBSERVED

BEFORESERVICINGTHISCHASSIS.

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SAFETYINSTRUCTION[LCD]ASIA, EU

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inflammability, voltage resistance, etc. therefore, use only replacementparts thathave

these same characteristics. Use only the specifiedparts when the mark isindicated

in the circuitdiagramorparts list.

7.Parts mounting and routingdressing ofwiringsshould bethe sameas thatused

originally. Forsafety purposes, insulating materials such as isolation tube ortape are

sometimes used and printed circuitboardsare sometimes mounted floating. Also make

sure thatwirings is routed and clamped to avoid parts thatgenerate heatand which use

high voltage. Always followthe manufactured wiring routes /dressings.

8.Always ensure thatallinternalwirings are inaccordance beforere-assembling the

externalcasing aftera repairing completed. Do notallowinternalwiring to bepinched

by cabinets, panels, etc. Any errorin reassembly orwiring can resultin electrical

leakage, flame, etc., and may be hazardous.

NEVERremodelthe productin any way. Remodeling can resultin improperoperation,

malfunction, orelectricalleakage and flame, which may behazardous.

10.Touch currentcheck. (Aftercompleting the work, measure touch currentto preventan

electric shock.)

lPlug the ACcord directly into the ACoutlet. Do NOTuse an isolation transformer

forthis check.

lConnecta measuring network fortouch currents between each exposed metallicpart

on the setand a good earth ground such as a waterpipe.

Annex D

(normative)

Measuring network for TOUCH CURRENTS

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SAFETYINSTRUCTION[LCD]ASIA, EU

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lThe potentialatany point(TOUCHCURRENT)expressed as voltage and

doesnotexceed thefollowing value:

Resistance values in orms ( ).

Input resistance : 1 M

Input capacitance : 200pF

Frequency range : 15 Hz to 1 MHz and d.c. respectively

Note: Appropriate measures should be taken to obtain the correct valuein caseof non

sinusoidal waveforms.

Themeasuring instrument is calibratedby comparing the frequency factor of with the

solid line infigure F.2 of IEC 60990 at various frequencies. A calibration curveis

constructedshowing the deviation of from theideal curve asa function of frequency.

TOUCH CURRENT = /500 (peak value).

V: Voltmeter or oscilloscope

(r.m.s. or peak reading)

Thepart orcontact of a TERMINAL is not HAZARDOUS LIVE if:

Note: The limitvalues of =0.35 V (peak) for a.c. and =1.0 Vfor d.c. correspond to

the values 0.7 mA (peak) a.c. and 2.0 mAd.c.

a) Theopen-circuit voltage should notexceed 35 V (peak) a.c. or 60 V d.c. or, if a)is not

met.

b) Themeasurementof the TOUCH CURRENTshall be carried out inaccordance with

IEC60990, with themeasuring network describedin Annex D of this standard.

TheTOUCH CURRENTexpressed as voltages and , does not exceed the

following values:

- for a.c. : =35 V(peak) and =0.35 V (peak);

- for d.c. : =1.0 V

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SAFETYINSTRUCTION[LCD]ASIA, EU

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ProductSafetyNotice

Manyelectricaland mechanicalparts in this chassishave specialsafety-related

characteristics. These characteristicsareoften passed unnoticed by a visualinspection and

the protection afforded by themcannotnecessarily be obtained by using replacement

components rated forhighervoltage, wattage, etc. Replacementparts which have these

specialsafety characteristics are identified in this manualand its supplements;electrical

components having such features are identified by the internationalhazard symbols on the

schematicdiagramand theparts list.

Before replacing any ofthese components, read the partslistin this manualcarefully. The

use ofsubstitutereplacementparts which do nothave the same safety characteristics as

specified in theparts listmay create electricalshock, fire, orotherhazards.

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SAFETYINSTRUCTION[LCD]ASIA, EU

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SAFETY INSTRUCTION

Handling theLCDModule

Safety Precaution

In the eventthatthe screen is damaged orthe liquid crystal(fluid)leaks, do notbreathein or

drink this fluid.

Also, nevertouch this fluid. Such actions could cause toxicity orskin irritation. Ifthis fluid

should enterthe mouth, rinse the mouth thoroughly with water. Ifthe fluid should contactthe

skin orclothing, wipe offwith alcohol, etc., and rinse thoroughly with water. Ifthe fluid

should enterthe eyes, immediately rinsethe eyes thoroughly with running water.

Precautions forHandlingthe LCD Module

The LCDmodule can easily bedamaged during disassembly orreassembly;therefore,

always observe thefollowing precautions when handling the module.

When attaching the LCDmodule to the LCDcover, position itappropriately and fasten

atthe position wherethe display can beviewed mostconveniently.

2.Carefully align the holes atallfourcorners ofthe LCDmodulewith the corresponding

holes inthe LCDcoverand fasten with screws. Do notstrongly push on the module

because any impactcan adversely affectthe performance. Also use caution when

handling the polarized screen becauseitcan easily be damaged.

CAUTION:Themetaledgesofthe LCDmoduleare sharp,handleit with

care.

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Handling theLCD Module

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3.Ifthepanelsurface becomes soiled, wipe with cotton ora softcloth. Ifthis doesnot

remove the soiling, breatheon the surface and then wipe again.

Ifthepanelsurface is extremely solied, use aCRT cleaneras a cleaner. Wipe offthe

panelsurface by drop the cleaneron thecloth. Do notdrop the cleaneron thepanel.

Pay attention notto scratch the panelsurface.

4.Leaving waterorotherfluids on the panelscreen foran extended period oftimecan

resultin discolorationorstripes. Immediately remove any type offluid fromthe screen.

5.Glass is used in the panel, so do notdrop orstrikewith hard objects. Such actions can

damage the panel.

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Handling theLCD Module

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6.CMOS-LSIcircuitry is used in the LCDmodule, so avoid damage dueto static

electricity. When handling the module, use a wristground oranchorground.

7.Do notexpose theLCD module to directsunlightorstrongultravioletrays foran

extended periodoftime.

8.Do notstore the LCDmodule belowthe temperature conditions described in the

specifications. Failure to do so could resultin freezing ofthe liquid crystaldue to cold

airorlossofresilience orotherdamage.

9.Do notdisassemble theLCDmodule. Such actionscould resultin improperoperation.

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Handling theLCD Module

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