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Red & Green pin of left lower 4th FPCshort
Symptom Cause Countermeasure
Change X-Board
Check Point
Check Point
1. Check the contact status with connector(foreign material, soldering condition)2. Replace X Board and check again.(If OK, X-Board is defected)3. By tracing defected line, check the contact condition of FPC and other connectors, IC outputstage and PCB pattern.4. If no problem, check the connector lead board.
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Symptom Cause Countermeasure
Re-insert the Connector Pattern Short by connector missinsert
Bottom Right 6th FPC R/BShort
Check Point
Check Point
1. Check the contact status with connector(foreign material, soldering condition)2. Replace X Board and check again.(If OK, X-Board is defected)3. By tracing defected line, check the contact condition of FPC and other connectors, IC outputstage and PCB pattern.4. If no problem, check the connector lead board.
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Symptom Cause Countermeasure
SHORT
X-Board Tape Rework
ADD Electrode short at R,G,BRaster or White Screen(Different color display)
Check Point
Check Point
1. Trace defected line
2. Check the condition of FPC and connector on the X-Board, IC Output stage and Electrodeline.
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Symptom Cause Countermeasure
Keep horizontal, or can be defected
OPENInterfere with mechanicalstructure when Moduleassembling
Cold soldering atConnector
Use Connector fixing iron plateKeep the contact point
horizontalwhen interfere with mechanical
parts
FPC connector Rework
1. Outbreak during heat run2. ADD Electrode open at one color Raster
or White screen(No discharge)
Check PointCheck Point
1. Trace defected line and check the condition of FPC and connector on X-Board, IC Outputstage and Electrode line.
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5/215/21
Symptom Cause Countermeasure
Replace the Panel
Connected minutely and openslowly as time passes
ADD open
Check PointCheck Point
1. Replace X Board and check again(Still problem, change the Panel)2. Check the connection status of Panel side.3. Check the connection condition of connector of Panel side and the FPC at upper ACF.
If it is OK, check Panel pad
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Symptom & Cause Countermeasure
Replace the Panel
1. Check the connection condition - Press the connector and reconnect2. Check the soldering condition of Connector lead3. Replace X Board and check again; Panel connector side or Circuit connector side
Board defect, in case of one line, check the output stage of Drive IC(Cold soldering/Pattern)If problems in input stage, several lines display
4. Observe the FPC
:X-board Board Board Driver IC / ()4. FPC :FPC * : panel open, ACF migration,, X-Board /Pattern,FPC
Check PointCheck Point
* The difference of ADD openand Short ?ADD open : Black vertical
bar at Raster ADD short : Different color
vertical bar atRaster
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Symptom Cause Countermeasure
Change Control Board
1. Check the 5V(Logic voltage) input to DC-DCIf it is lower than 5V, it makes similar problem
2. Check X Board(Open or Short circuit)3. Check the connection condition(conncetion status, foreign material at connector, etc)4. Check the drive IC at X Board(If defected, change the Board)5. Confirm the connection of the connector
Check PointCheck Point
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Symptom Cause Countermeasure
Change X-BOARD
Driver clock line at X Driver Board is designed to operate in A and B groupShort circuit at clock line of Drive ICIf problem at input stage, several lines are defected at one pointReplace the X Board of defected point
Check PointCheck Point
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Countermeasur Symptom Cause
ChangeX Board
PCB pattern is connected minutelyForeign material when photo resisting
Check PointCheck Point
1. Check the connection condition of the Connector.2. Check the cold soldering.
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Symptom Cause Countermeasure
Resistance between 186 pin of U3and 7 pin of U300 is 62Normal condition : 2
Because of foreign material in Viahole at U300 side Change Control Board
Vertical bar in every20mm
Check PointCheck Point
1. Measure the resistance of Via holes between U3 and U300 at Control Board and compare withthat of normal.(Normal : 2~3 )
2. Resistance increases as temperature rises.
7/30/2019 CURSO TV PLASMA PARTE 3
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CountermeasureSymptom Cause
- Open circuit between pin 7 of U200 and pin 7 of U7
- Resistance between two pinsvaries from
19 ohm ~ 45Kohm
Replace Control
Board
Check PointCheck Point
1. Observe the symptom during Heat-Run at 45 degree.
2. Check the resistance of VIA holes of suspect ICs
7/30/2019 CURSO TV PLASMA PARTE 3
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12/21
1. Because Control data on PROM(U40)doesnt download to FPGA, it cantgenerate control signal to X,Y and Z
Board.
2. Defected ALTERA.
Replace Control BoardReplace PROM
Symptom Cause Countermeasure
- When Power On, Fan operatesbut No OSD displays- LED(D3) of Control Boarddoesnt operate
Check PointCheck Point
1. Check D1, D3 & D4 on Control Board- D1 : ON with 5V- D3 : ON when PROM finishes program download from ALTERA chip- D4 : ON when signal is applied
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Symptom Cause Countermeasure
Control Board
Replace Controller board
Touch point(Marked)No signal or at PC mode, dark redraster displays. This is darker thannormal Red signal.
Neighboring Pins of U1(FPGA)
touch
Check PointCheck Point
- TV VSC board- Board connector(50 pin) contact point- Control board of Module
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Symptoms Cause Countermeasure
1. CN1 on Vs Board coldsoldering2. Spark marks between CN1and Vs Board -> It makesthem open
Replace DC-DC 2 board
Vs board1. No Raster(ST-BY LED On)2. Spark noise(Tik-Tik)3. No Vs, Vsetup & Vsc
Check PointCheck Point
1. Check Vs, Va with multimeter(No Vs output)2. Separate SMPS Board and VSC Board and check all voltage outputstage
3. Check FET, TR, Diode and Resistor(especially Cement Resistor)4. Observe PCB Pattern and soldering condition with naked eyes
7/30/2019 CURSO TV PLASMA PARTE 3
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15/21
Symptom Cause Countermeasure
1. PCB pattern of OVP circuit is wrong(In some SET)2. The discharging time of Vsetup is long,if Power On again within dischargingtime, this remaining voltage isconsidered as pulse and shut downcontrol circuit
Power toggles(On and Off)
Replace DC-DC2board
Defected SET : OVP Circuit
Check PointCheck Point
1. Power On/Off function doesnt work Initial Power On OK2. Power On : - Fan operates normally - No Vsetup & Vsc of Module3. Only Module operate : No Vs,Vsetup & Vsc
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Definition of Cell Defect
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Type
A & B zone : below then 50 mmDefectDistance
B zone (30%)(30%)A zone (70%)(70%)
Total 0 cellNonexting
uishing
N = 0Uncontrollable
N 3(cells/RGB scn)conjunction 2 cell 0
Dark+ Un
-stable
N 5(cells/RGB scn)conjunction 2 cell 2
N 2(cells/RGB scn)Total N 6(cells/full
screen)
TotalDefect N 25 cells/full screen
Total 0 cellNon-
extinguishing
Total 5 cellUnstable
Uncontroll
able
N 5 cell / RGB scnDensity : 2cell/ for
each ColorDark
RemarksSpecificationType
Extinguished sizeis less than 50%.
N 6 cell / RGB scnDensity : 2cell/ for
each Color
ignited size is morethan 50%.
ignited size is morethan 50%.
Type
A & B zone :below then 100(A)/50(B) mmDefect
Distance
B zone (75%)(75%)A zone (25%)(25%)
N 2(cells/RGB scn)
Nonextinguishing
Total 1cellUncontrollable
N 2(cells/RGB scn)conjunction 2 cell 0Dark
N 4(cells/RGB scn)conjunction 2 cell 1
Total N
2(cells/fullscreen)conjunction 2 cell 1
TotalDefect N 39 cells/full screen
Total 0 cell
Unstable N 4(cells/RGB scn)
Comparison of Specification(III)
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Comparison of Specification(III)
60 PDP Panel
LG PDP panel has a tight specification of celldefect in comparison with other companiesproduct.
Pi_50
15Uncontrollable0
36LG_60
Dark/unstable
Non-extinguishing
NE_50
35Total
* SS : Normal cells 99.9% of total cells=> It means 3,140 defects will be O.K for 50
DefectDistance
Uncontrollable
N 11(cells/RGB scn)conjunction 2 cell 0
Dark+ Un
-stable
N 12(cells/RGB scn)conjunction 2 cell 2
N 3(cells/RGB scn)Total N 9(cells/full
screen)
TotalDefect N 35 cells/full screen
N 2(cells/RGB scn)Total N 6(cells/full
screen)
Pi_50 Spec. of Cell Defect(01/4/25)
Total 0 cellNon-
extinguishing
Total cellUnstable
Uncontrollab
le
N cell / RGB scnDensity : 2cell/ for
each Color Dark
RemarksSpecificationType
extinguished sizeis less than 50%.
N cell / RGB scnDensity : 2cell/ for
each Color
ignited size is more
than 50%.
ignited size is morethan 50%.
LGE 60 Spec. of Cell Defect (PDP60WVDN2)
Type
D50 mm, N 1 (D:Semidiameter)
B zone (30%)(30%) A zone (70%)(70%)
Nonextinguishing Total 0 cell
Type
A & B zone :below then 100(A)/50(B) mmDefect
Distance
B zone (%)(%) A zone (%)(%)
N (cells/RGB scn)
Nonextinguishing
Total cellUncontrollable
N (cells/RGB scn)conjunction cell 0Dark
NE_50 Spec. of Cell Defect (MV5501, 01/1/13)
N (cells/RGB scn)conjunction cell 1
Total N (cells/fullscreen)
conjunction 2 cell 1
TotalDefect N cells/full screen
Total 0 cell
Unstable N (cells/RGB scn)
C ll D f t S
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Cell Defect Spec.
1. Cell Defect Specification
Div. 40 42 60
Zone A - Zone B - Zone A - Zone B - Zone A Zone B Zone
Non ignition DotAnd
Unstable Dot
* N 2 [Cells / RGB scn]Total N 6
[Cells / full scn]* 2cell conjunction point :
N 0* include Unstable dot:
N 3
* N 4 [Cells / RGB scn]To tal N 12
[Cells / full scn]* 2cell conjunction point :
N 0* include Unstable dot:
N 6
* N 3 [Cells / RGB scn]Total N 9
[Cells / full scn]* 2cell conjunction point :
N 0* include Unstable dot:
N 4
* N 5 [Cells / RGB scn]Total N 15
[Cells / full scn]
* 2cell conjunction point : N 2
* 3cell conjunction point : N =0
* include Unstable dot: N 7
* N 11 [Cells / RGB scn]Total N 33
[Cells / full scn]
* 2cell conjunction point : N 2
* 3cell conjunction point : N =0
* include Unstable dot: N 11
* N 12 [Cells / RGB scn]Total N 36
[Cells / full scn]
* 2cell conjunction point : N 2
* 3cell conjunction point : N =0
* include Unstable dot: N 12
Uncontrollable Dot N=0 N 1 [Cells / RGB scn]Total N 3 [Cells / full scn]
N=0 N 2 [Cells / RGB scn]Total N 6 [Cells / full scn]
N 2 [Cells / RGB scn]Total N 6 [Cells / full scn]
N 3 [Cells / RGB scn]Total N 9 [Cells / full scn]
Non extinguishingDot N=0 N=0 N=0 N=0 N = 0 N = 0
Defect Distance 50mm 50mm D 5cm, N 1 (D:Semidiameter)
; however, include conjunctive cell, N = 0
Total Defect N 21 [Cells / full scn] N 25 [Cells / full scn] N 35[Cells / full scn]
Stain*1 D 5, N 3*D 5, N=0
* 1 D 5, N 3* D 5, N=0
* 1 D 5, N 3 ( Stain Distance : 50 mm)* D>5, N = 0 ( Stain Distance : 50 mm)