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Troubleshooting


4. Troubleshooting
4-1 Troubleshooting

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,andbetweenthe
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
areimproperlyconnectedortheMainBoardorSMPSisnotfunctioning.Inthiscase,checkthefollowing:
Major - Check the internal cable connection.
Checklist - Check the fuses.
- Check the output voltages of the SMPS.
- Replace the Main Board.




3
2 4


5
1




Check that the AC power cord is connected
No
Connect the AC power cord
Yes
Troubleshooting
Procedures If LED is set up as being ON when No
POWER-ON,checktheligt-oninLED Replace Fuse (FE801)
Yes


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


Check the connection between Fuse FE801 No
,FB801,FS803forcheckingSMPS'sFuse
Replace Fuse

Yes


No
ChecktheNo.4STAND-BYpowerof
CN801
Replace the SMPS

Yes


Replace the Main Board




4-2 Samsung Electronics
Troubleshooting


Whentheunitisrepeatedlyturningonandoff
Symptom - The SMPS relay is repeatedly turning on and off.

Ingeneral,theSMPSrelayrepeatedlyturnsonandoffbytheprotectionfunctionduetoadefectonaboard
connected to the SMPS.
- DisconnectallcablesfromtheSMPS,operatetheSMPSaloneandcheckiftheSMPSworksproperlyandif
Major Checklist each voltage output is correct.
- IfthesymptomcontinuesevenwhenSMPSisoperatedalone,replacetheSMPS.
- IfthesymptomisnotobservedwhenoperatingtheSMPSalone,findanydefectiveassembliesby
connecting the cables one by one.




1




CheckthattheVa,VsvoltageofSMPS No
match the voltages marked on the module Replace the SMPS
Troubleshooting label

Procedures Yes

No
Did problem improve? Replace the Main Board
Yes

No
Did problem improve? ReplacetheYMainBoard

Yes

No
Did problem improve? ReplacetheXMainBoard
Yes

No
Did problem improve? Replace the Logic Board

Yes

No
Did problem improve? ReplacetheX,YBufferBoard




WhenseparatingandconnectingthecablessuchasCN800,CN801,CN802,CN803,CN804,CN805ofthe
MAINSMPS,CN4005oftheXMAINBoard,andCN5005oftheYMAINBoard,asparkmaybegeneratedby
Caution
theelectricchargeofthehighcapacitycapacitor.Therefore,waitsometimeafterdisconnectingthepowercord
from the unit.




Samsung Electronics 4-3
Troubleshooting


NoSound
Symptom - Video is normal but there is no sound.

- When the speaker connectors are disconnected or damaged.
Major Checklist - When the sound processing part of the Main Board is not functioning.
- Speaker defect.




2



1


3 3
Troubleshooting
Procedures
Is the cable connection between the Main No
Board and the speaker properly connected?
Cable Connection

Yes


No
CheckthatthevoltageofNo.7,8pinof
SMPS CN801 has 12V
Replace the SMPS

Yes


Is the speaker output terminal of the Main No
Replace the Main Board
Board normal?
Yes


Replace the Speaker




4-4 Samsung Electronics
Troubleshooting


4-1-3 FaultsandCorrectiveActions
Symptom Related Image Causes and Countermeasures



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




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




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




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




Samsung Electronics 4-5
Troubleshooting


Symptom Related Image Causes and Countermeasures




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




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




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




A blank screen appears - ReplacetheY-Mainboard




4-6 Samsung Electronics
Troubleshooting


4-1-4 TroubleshootingProceduresbyassembly
<50">
No Assembly Major Symptoms
1 SMPS-PDP TV Nopower,Blankscreen,theRelayrepeatsOnandOff
2 ASSYPDPMODULEP-XMAIN Blank screen
3 ASSYPDPMODULEP-YMAIN Blank screen
4 ASSYPDPMODULEP-LOGICMAIN Blankscreen,Screennoise
5 ASSYPDPMODULEP-Y-MAINSCANUPPER Upper screen is blank
6 ASSYPDPMODULEP-XMAINSCANLOWER Lower screen is blank
7 ASSYPDPMODULEP-ADDRESSEBUFFER Corresponding Buffer Board block screen is blank
8 ASSYPDPMODULEP-ADDRESSFBUFFER Corresponding Buffer Board block screen is blank
9 ASSYPCBMISC-MAIN NoPower,Abnormalscreenforeachinputsource,PIPscreentrouble,Soundtrouble
The side function key does not work properly.
10 ASSYBOARDP-FUNCTION&IR
Theremotecontroldoesnotworkproperly,theLEDdoesnotworkproperly.




1




4

9

0




5

2


3



6




7 8




Samsung Electronics 4-7
Troubleshooting


<58">
No Assembly Major Symptoms
1 ASSYPDPP-ADDRESSG-BUFFERBOARD Corresponding Buffer Board block screen is blank
2 ASSYPDPP-ADDRESSF-BUFFERBOARD Corresponding Buffer Board block screen is blank
3 ASSYPDPP-ADDRESSE-BUFFERBOARD Corresponding Buffer Board block screen is blank
4 ASSYPDPP-YSCANBUFFERPAIR Blankscreen,Screennoise
5 ASSYPDPP-Y-MAINBOARD Upper screen is blank
6 ASSYPDPP-LOGICMAIN Blankscreen,Screennoise
7 ASSYPDPP-X-MAINBOARD Corresponding Buffer Board block screen is blank
8 ASSYPDPP-X-MAINBUFFERBOARD Lower screen is blank
9 SMPS_PDP TV Nopower,Blankscreen,theRelayrepeatsOnandOff
10 ASSYPCBMISC-MAIN NoPower,Abnormalscreenforeachinputsource,PIPscreentrouble,Soundtrouble
The side function key does not work properly.
11 ASSYBOARDP-TOUCHFUNCTION&IR
Theremotecontroldoesnotworkproperly,theLEDdoesnotworkproperly.



1 2 3




7
4
8
5
6




3 2 1




9




0


4




4-8 Samsung Electronics
Troubleshooting


4-2 Adjustment

4-2-1 ServiceInstruction

BeforePerformingAfterSalesServices
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.

ServiceadjustmentitemafterreplacementofBoard

PDPOptionofFactoryModesettheFactoryDataTypeitemasthesuitablevalueofrelevantmodel.
Adjust Calibration of Factory Mode for each mode.
Adjust White Balance of Factory Mode.

WritedownthevalueofHDMIWhiteBalanceofFactoryModebeforereplacingBoard.
PDPOptionofFactoryModesettheFactoryDataTypeitemasthesuitablevalueofrelevantmodel.
SetthevalueofHDMIWhiteBalancewiththevaluewrittendownbefore.




Samsung Electronics 4-9
Troubleshooting


4-2-2 HowtoAccessServiceMode

1. GeneralRemote
ToEnter: POWEROFF MUTE 1 8 2 POWERON
(Intervalbetweenkeystrokes:lessthan3sec)
ToExit: POWEROFF POWERON

2. Factory Remote
ToEnter: POWERON INFO FactoryKey (Intervalbetweenkeystrokes:lessthan3sec)

ToExit: POWEROFF POWERON
Press the Factory key twice with a key stroke interval of more than 1 second (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 Byte Expert Settings
ADC Expert D-Settings
ADC Target ExpertGrayScale
ADC Result Expert C-Space
White Balance Expert Others
W/B Movie CHECKSUM0x0000
EPA Standard View Log
Video/Scaler Font Data Viewer
Enhancement T-SPNAUSC-1000.4
T-SPNAUSM-0019
SOUND MTK-DRV2.0.61.0
Dynamic Contrast RFS:T-SPNAUS-20080103
2008-01-31
LNA+ PANEL:50FSPU
HotelOption PN50A550
EDID SUCCESS
EDID Option:00012101208001833921
4001 0000 0
CALIB:AV*COMP*PC*HDMI*
PDP Option DTP-COMP-0105-550-US-0002
DTP-LM-0097-550US-0005
Dateofpurchase:00/00/0000
The version of the firmware displayed at the bottom of the screen may differ and the firmware is subject to change for the
improvement of product functions.
IfyouhaveadjustedthesettingsinServiceMode,youhavetoresettheproduct.


4-10 Samsung Electronics
Troubleshooting


4-2-3 FactoryData Theunderlinedareitemsappliedduringtheserviceadjustment.Noneoftheothersshouldbeadjusted.


1. Option Byte
ITEM
Factory Reset DVI/HDMISound Auto SIDE AV OPTION 32/37/40/52
Panel Option 50FMRT4 7.5IRE OFF Visual Test Disable
Model A550 7.5IREOffset ... TUNSR ALPS
Watchdog Enable ON HDMIHotPlug Enable Expert Adj OFF
Spread Spectrum 2% HDMIDelayTime 600ms WB Reset OFF
SSpectrum Period 1000ns HDMIFLTCNTSIG 300ms EER Reset
Dimming Selection ... HDMIFLTCNTLOS 300ms
RS-232 jack Product UNSTABLE BAN CNT 2500ms
Gamma 0.88 HDMIErrCnt 2
LVDS OUT Format PDP Wall Calib.
Panel Display Time 1Hr Watchdog Count 0
Panel Time Reset Out Clock INV CLK_INV
Mute Time[RF] 600ms Out Clock Phase 4
Shop Mode[Aft.F/R] OFF SUB MICOM DOWN OFF
PC Mode Ident Auto IIC BUS STOP OFF
"UF1moduleType-50FMEUF1,Gamma-0.95"

2. White Balance
ITEM
Sub Brightness 128
R-Offset 514
G-Offset 512
B-Offset 511
Sub Contrast 128
R-Gain 617
G-Gain 512
B-Gain 593
Movie R-Offset 566
Movie B-Offset 488
MovieR-Gain 631
MovieB-Gain 387




Samsung Electronics 4-11
Troubleshooting




3. W/B Movie
ITEM ITEM
W/B Movie OFF NOR_Roffset ...
Mode ... NOR_Boffset ...
Color Tone ... C2_Rgain ...
Msub Brightness ... C2_Bgain ...
Msub Contrast ... C2_Roffset ...
W1_Rgain ... C2_Boffset ...
W1_Bgain ... MovieGamma ...
W1_Roffset ... Movie Contrast ...
W1_Boffset ... Movie Brightness ...
W2_Rgain ... Movie Color ...
W2_Bgain ... Movie Sharpness ...
W2_Roffset ... Movie Tint ...
W2_Boffset ... Movie Backlight ...
NOR_Rgain ...
NOR_Bgain ...


4. EPA Standard
ITEM
Standard Contrast 95
Standard Brightness 45
Standard Sharpness 50
Standard Color 50
Standard Tint 0
Standard Backlight 7


5. Video/Scaler
ITEM
manualAGC OFF Gain2 5
MIN_HWIDTH 7 Gain3 5
MAX_HWIDTH 20 Gain4 5
TH_HIGH 7 Gain5 5
TH_SUPER 26 Gain6 5
Noise Level 127 Gain7 2
LowGain 74 Gain8 2
MiddleGain 80 LTI_Gain 2
HighGain 80 ECTI_Gain 2
Local Low 74 PIP_CTI_GAIN 4
Local Middle 80 PIP_CTI_FGAIN 32
LocalHigh 80 U delay 0
Limit Pos 64 V delay 0
Limit Neg 64 Color_mid_value 156
Gain1 5 Chip_th 10




4-12 Samsung Electronics
Troubleshooting


6. Enhancement 9. LNA+

Item Item
Patt-Sel 0 LNA PLUS ON
B-Slope gain 80 RF_dB0_TH 1
B-Tilt min 40 RF_dB1_TH 3
B-Tilt-max 90 RF_dB2_TH 5
Lfunc-Basis 70 RF_dB3_TH 18
Hfunc-Basis 80 NR1_Coring 0
Mean-Offset1 50 NR2_Coring 4
Mean-Offset2 235 NR3_Coring 6
Mean-Slope 100 NR4_Coring 8
ACR-Offset 5
ACR-Th1 10 10.HotelOption
ACR-Th2 110 Item
Skin-Enable ON HotelMode OFF
Skin-UV 133 Power On Channel ...
Sub color 133 Power On Band ...
Power On Volume ...
7. SOUND
Max Volume ...
Item Panel Button Lock ...
FM/AM Prescale 3ch Power On Source ...
Carrier Mute ON
HighDevision OFF 11. EDID
SAPHighThreshold 70h Item
SAP Low Threshold 30h EDID ON/OFF ON
Melody Volume 10 ALL EDID Success
Audio Delay 36 PC EDID Success
STA Amp Vol. 29h HDMI1EDID Success
STA Limit Att. 9h HDMI2EDID Success
STA Limit Rel. fh HDMI3EDID Success
STA Post Scale 55h EDID VERSION HDMI1.3
STA Speaker EQ ON


8. Dynamic Contrast
Item
Dynamic CE OFF
Dynamic Dimming ON
LBEY_MEAN 445




Samsung Electronics 4-13
Troubleshooting


12. PDP Option
Item
Pixel Shift Test OFF
Logic D/L OFF
Panel Pattern Sel. 0
Panel Type B1
Panel Inch 50"FHD
Panel Version W2
Panel Temperature 53
Logic SW Version 70208
Checksum 4543
MB SW ...
MB Offset1 ...
Ve Control ...
Module Running Time ...
FRC Mode ...
FRC Bypass ...
FRCDBGMarkOn ...
FRC MD Force ...
DRC ...


13.CHECKSUM0x0000

14. View Log
Item
Select Log Type DEFECT
View Log
Delete Log


15.FontDataViewer




4-14 Samsung Electronics
Troubleshooting


4-2-4 ServiceAdjustment

WhiteBalance-Calibration

Ifpicturecoloriswrong,docalibrationfirst.

Execute calibration in Factory Mode
1. Source :VIDEO
2. SettingMode :PALVideo(MODE:#2)
3. Pattern :Pattern#24(ChessPattern)
4. UseEquipment :K-7256orEquipmentofequalitylevel
5. Workorder
1 Enter by Factory Mode select "2. WB Adjust".
2Select"CALIBRATION".
3Select"AVCALIBRATION"againinCALIBRATIONMENU.
4AfterCompletingCalibration,comeout"Avsuccess".OSDonthescreen(bottom-side)forabout3seconds.

Source AV:PALcomposite,Component:1280*720/60Hz
PC:1024*768/60Hz




< Chess Pattern >




Samsung Electronics 4-15
Troubleshooting


WhiteBalance

Adjust spec.
1. Source :HDMI
2. SettingMode :1280*[email protected]
3. Pattern :Pattern#92
4. UseEquipment :MIK-7256(MSPG925L)





5. Workorder
ConnectHDMI(DVI)outputterminalofMIK-7256(MSPG925L)totheHDMIinputinmainset
SettheinputtoHDMImode
Enter the White Balance menu of service mode
Contact CA-210 sensor to glass filter




< Fixed Position of CA210 Probe >

Adjust the low light
-AdjustSub-Bright(LBE)tosetthe`Y'value
-AdjustR-Offset(`x')andB-Offset(`y')tothecolorcoordinates.
*DonotadjustG-Offsetdata
Adjust the high light
-AdjustSub-Contrast(LBE)tosetthe`Y'value
-AdjustR-Gain(`x')andB-Gain(`y')tothecolorcoordinates.
*DonotadjusttheG-gaindata




4-16 Samsung Electronics
Troubleshooting




<50")
(CA-210)
Input mode
x y Y(L) T(K),MPCD
Don'tControl
H/L 278 285 10,500/