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Troubleshooting

4.Troubleshooting
4-1 CheckpointsbyErrorMode

4-1-1 FirstChecklistforTroubleshooting
1. Check the various cable connections first.
- Check to see if there is a burnt or damaged cable.
- Check to see if there is a disconnected or loose cable connection.
- Check to see if the cables are connected according to the connection diagram.

2. Check the power input to the Main Board.

3. CheckthevoltageinandoutbetweentheSMPSMainBoard,betweentheSMPSX,YMainBoard,
and between the Logic Boards.

Samsung Electronics 4-1
Troubleshooting

4-1-2 CheckpointsbyErrorMode

NoPower

- The LEDs on the front panel do not work when connecting the power cord.
Symptom - The SMPS relay does not work when connecting the power cord.
- The unit appears to be dead.

The SMPS relay or the LEDs on the front panel does not work when connecting the power cord
if the cables are improperly connected or the Main Board or SMPS is not functioning.
Inthiscase,checkthefollowing:
Major
- Check the internal cable connection.
Checklist
- Check the fuses.
- Check the output voltages of the SMPS.
- Replace the Main Board.

No Power

1
Yes
Check that the AC power cord is Connect the AC power cord
connected?

Refer to image of
No
Fig. 4-1.

If LED is set up as
No
beingONwhenPOWER-ON, Replace Fuse (FE801)
check the ligt-on in LED?

Yes

2
No
Is the AC Inlet socket Connect AC Inlet socket
connected?

Yes Refer to image of
Fig. 4-1.

4-2 Samsung Electronics
Troubleshooting

3
Check the connection between No
FuseF801S,forchecking Replace Fuse
SMPS's Fuse?

Refer to image of
Yes
Fig. 4-1.

4
No
ChecktheNo.4STAND-BY Replace the SMPS
power of CN801?

Yes Refer to image of
Fig. 4-1.

5
Replace the Main Board

Refer to image of
Fig. 4-1.

Samsung Electronics 4-3
Troubleshooting

1 3 2 4 5
<42" PDP>

1 3 2 4 5
<50" PDP>

4-4 Samsung Electronics
Troubleshooting

Whentheunitisrepeatedlyturningonandoff

Symptom The SMPS relay is repeatedly turning on and off.

Ingeneral,theSMPSrelayrepeatedlyturnsonandoffbytheprotectionfunctionduetoadefect
on a board connected to the SMPS.
- DisconnectallcablesfromtheSMPS,operatetheSMPSaloneandcheckiftheSMPSworks
Major
properly and if each voltage output is correct.
Checklist
- IfthesymptomcontinuesevenwhenSMPSisoperatingalone,replacetheSMPS.
- IfthesymptomisnotobservedwhenoperatingtheSMPSalone,findanydefective
assemblies by connecting the cables one by one.

WhenseparatingandconnectingthecablessuchasSMPS,XMAINBoardandYMAINBoard,
Caution asparkmaybegeneratedbytheelectricchargeofthehighcapacitycapacitor.Therefore,wait
some time after disconnecting the power cord from the unit.

When the unit is repeatedly turning on
and off

1
CheckthattheVa,VsvoltageofSMPS Yes
TunetheVa,VsorReplacetheSMPS
match the voltages marked on the
module label?

Refer to image of
No Fig. 4-2.

No
Did problem improve? Replace the Main Board

Yes

Did problem improve? No YMainBoardcablecheckorReplace
the SMPS

Yes

Samsung Electronics 4-5
Troubleshooting

No XMainBoardcablecheckorReplace
Did problem improve?
the SMPS

Yes

Did problem improve? No Logic Board cable check or Replace
the SMPS

Yes

Did problem improve? No
ReplacetheX,YBufferBoard

4-6 Samsung Electronics
Troubleshooting

1
<42" PDP>

1
<50" PDP>

Samsung Electronics 4-7
Troubleshooting

NoSound

Symptom Video is normal but there is no sound.

Generally there are four things that can cause this issue.
- Speakers not connected
Major
- Speakers are defective
Checklist
- Main board audio error
- SMPS not supplying voltage to the main board

No Sound

Is the cable connection between Yes
the Main Board and the speaker Make the connection
properly connected?

1 No
Checkthatthevoltageonpin7,8of Replace the SMPS
CN801 has 12V?

Yes Refer to image of
Fig. 4-3.

Use an oscilloscope to
monitor the output of the speaker jack. No
Replace the Main Board
Does the wave form match the
wave form listed?

Yes

2
Replace the Speaker
SoundOutputShape

Refer to image of
Fig. 4-3.

4-8 Samsung Electronics
Troubleshooting

2 1 2
<42" PDP>

2 1 2
<50" PDP>

Samsung Electronics 4-9
Troubleshooting

4-1-3 FaultsandCorrectiveActions

Symptom RelatedImage CausesandCountermeasures

Address buffer defect
A blank vertical cell - Replace the corresponding
(block) appears on the upper/lowerbuffers(E,ForG)
screen. COF defect (burnt)
- Replace the module

A green screen appears
The Scale is not reseting
when the TV is turned
- Replace the Main board
on.

Incorrect program version
The OSD box appears
- Check the version of each program
but there is no text.
- Replace the Main board

Upper/LowerYBufferdefect
A blank upper (or lower)
- Replace the corresponding upper/
block appears on the
lower buffers
screen.

4-10 Samsung Electronics
Troubleshooting

Symptom RelatedImage CausesandCountermeasures

Either the main or
sub picture does not Replace the Main board
appear.

The SMPS voltage is incorrect
A vertical green line - Adjust the SMPS voltage according
appears on the screen. to the voltage printed on the module
label

X-Mainboarddefect
Dim screen
- ReplacetheX-Mainboard
(blurred in red)

Samsung Electronics 4-11
Troubleshooting

4-1-4 TroubleshootingProceduresbyassembly
IfMajorSymptomsishappened,CheckAssemblyrefertotableasfollow.

Assembly MajorSymptoms

SMPS-PDP TV Nopower,Blankscreen,theRelayrepeatsOnandOff

ASSYPDPP-X-MAINBOARD Blank screen

ASSYPDPP-Y-MAINBOARD Blank screen

ASSYPDPP-LOGICMAINBOARD Blankscreen,Screennoise

ASSYPDPP-X-MAINBUFFERBOARD Upper screen is blank

ASSYPDPP-Y-MAINBUFFERBOARD Lower screen is blank

ASSYPDPP-E-BUFFERBOARD Corresponding Buffer Board block screen is blank

ASSYPDPP-F-BUFFERBOARD Corresponding Buffer Board block screen is blank

NoPower,Abnormalscreenforeachinputsource,PIPscreen
ASSYPCBMISC-MAIN
trouble,Soundtrouble

The side function key does not work properly.
ASSYBOARDP-TOUCHFUNCTION&IR Theremotecontroldoesnotworkproperly,theLEDdoesnot
work properly.

4-12 Samsung Electronics
Troubleshooting

4-2 Adjustment

4-2-1 ServiceInstruction

Beforeperformingservice
1. Check if the measurement and test equipment is working properly.

2. Secure sufficient work space for disassembling the product.

3. Prepare a soft pad for disassembling the product.

Serviceadjustmentafterboardreplacement

1. PDPOptionofFactoryModesettheFactoryDataTypeitemasthesuitablevalueofrelevantmodel.

2. Adjust Calibration of Factory Mode for each mode.

3. Adjust White Balance of Factory Mode.

1. WritedownthevalueofHDMIWhiteBalanceofFactoryModebeforereplacingBoard.

2. PDPOptionofFactoryModesettheFactoryDataTypeitemasthesuitablevalueofrelevantmodel.

3. SetthevalueofHDMIWhiteBalancewiththevaluewrittendownbefore.

Samsung Electronics 4-13
Troubleshooting

4-2-2 HowtoAccessServiceMode

1. General Remote

ToEnter: POWEROFF INFO MENU MUTE POWERON

ToExit: POWEROFF POWERON

2. Factory Remote

ToEnter: POWERON INFO FactoryKey (Intervalbetweenkeystrokes:lessthan3sec)

ToExit: Press the Factory key twice. (Pressing once enters Aging Mode)

3. Settings when entering Factory mode
- SharpScreen(Dynamic),ColorTone(Cool1),Factory(DynamicCEOff)

4. Adjustment Procedures
- ChannelKey:Selectanitem.
- Volume Key:Adjustthevalueupordown.
- MENUKey:SavethechangestotheEEPROMandreturntothehigher-levelmode.
- UsingtheNumeric(0~9)keys,youcanselectachannel.
- UsingtheSOURCEkey,youcanswitchAVmodes.

5. InitialSERVICEMODEDISPLAYState

Option T-TDT5DEUC

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