Samsung PS51E450A1W - Servicing Precautions

1.Precaution
1.2.ServicingPrecautions
WARNING
1)Firstcarefullyreadthe“SafetyInstruction”inthisservicemanual.
Whenthereisaconictbetweentheserviceandthesafetyinstructions,followthesafetyinstructionatalltimes.
2)Anyelectrolyticcapacitorwiththewrongpolaritywillexplode.
1)Theserviceinstructionsareprintedonthecabinet,andshouldbefollowedbyanyservicepersonnel.
2)MakesuretounplugtheACpowercordfromthepowersourcebeforestartinganyrepairs.
a)Removeorre-installpartsorassemblies.
b)Disconnecttheelectricplugorconnector,ifany.
c)Connectthetestpartinparallelwiththeelectrolyticcapacitor.
3)Somepartsareplacedatahigherpositionthantheprintedboard.Insulatedtubesortapesareusedforthispurpose.
Theinternalwiringisclampedusingbucklestoavoidcontactwithheatemittingparts.Thesepartsareinstalledback
totheiroriginalposition.
4)Aftertherepair,makesuretocheckifthescrews,partsorcablesareproperlyinstalled.Makesurenodamageiscaused
totherepairedpartanditssurroundings.
5)CheckforinsulationbetweenthebladeoftheACplugandthatofanyconductivematerials(i.e.themetalpanel,
inputterminal,earphonejack,etc).
6)InsulationCheckProcess:
UnplugthepowercordfromtheACsourceandturntheswitchon.Connecttheinsulatingresistancemeter(500V)to
theACplugblade.TheinsulatingresistancebetweenthebladeoftheACplugandthatoftheconductivematerial
shouldbemorethan1MΩ.
7)AnyB+interlockshouldnotbedamaged.
Ifthemetalheatsinkisnotproperlyinstalled,noconnectiontotheACpowershouldbemade.
8)Makesurethegroundingleadofthetesterisconnectedtothechassisgroundbeforeconnectingtothepositivelead.
Thegroundleadofthetestershouldberemovedlast.
9)Bewareofrisksofanycurrentleakagecomingintocontactwiththehigh-capacitycapacitor.
10)Thesharpedgesofthemetalmaterialmaycausephysicaldamage,soprotectyourselfbywearingglovesduringthe
repair.
11)Duetothenatureofplasmadisplaypanels,partialafter-imagesmayappearifastillpictureisdisplayedonthescreen
foralongperiodoftime.
Thisiscausedbybrightnessdeteriorationduetothestorageeffectofthepanel,andtopreventthisfromhappening,we
recommendthatthebrightnessandcontrastarereduced.(e.g.)Contrast:25,Brightness:50
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