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PDP MODULE
SERVICE MANUAL
English
MODEL : PDP42V5####
CAUTION
1. BEFORE SERVICING THE PDP MODULE,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
2. WHEN REPLACEMENT PARTS ARE REQUIRED, BE SURE TO USE
REPLACEMENT PARTS SPECIFIED BY THE MANUFACTURER..
Korean
SAFETY PRECAUTIONS
PDP Module is a display device to be divided into a Panel part (8) If the power cable is damaged, or if the connector is loose,
and a Drive part. The Panel part consists of do not use the product: otherwise, this can lead to fire or
Electrodes, Phosphor, various dielectrics and gas, and the Drive electric shock.
part includes electronic circuitry and PCB.
When using/handling this PDP Module, pay attention to the (9) If the power connector or the connector of the power cable
below warning and cautions. becomes dirty or dusty, wipe it with a dry cloth. Otherwise,
this can lead to fire.
(10) PDP Module uses a high voltage (Max.450V dc). Keep
Warning? the cautions concerning electric shock and do not touch
Indicates a hazard that may lead to death or injury if the the Device circuitry when handling the PDP Unit. And
warning is ignored and the product is handled incorrectly. because the capacitor of the Device circuitry may remain
charged at the moment of Power OFF, standing by for 1
minute is required in order to touch the Device circuitry.
Caution?
Indicates a hazard that can lead to injury or damage to
property if the caution is ignored and the product is handled ¥ CAUTIONS
.
incorrectly. (1) Do not place this product in a location that is subject to
heavy vibration, or on an unstable surface such as an
inclined surface. The product may fall off or fall over,
causing injuries.
¥ . WARNING
(1) Do not supply a voltage higher than that specified to this (2) Before disconnecting cable from the product, be sure to
product. This may damage the product and may cause a turn off the power. Be sure to hold the connector when
fire. disconnecting cables. Pulling a cable with excessive force
may cause the core of the cable to be exposed or break
(2) Do not use this product in locations where the humidity is the cable, and this can lead to fire or electric shock.
extremely high, where it may be splashed with water, or
where flammable materials surround it. (3) This product should be moved by two or more persons. If
Do not install or use the product in a location that does no one person attempts to carry this product alone, he/she
satisfy the specified environmental conditions. This may may be injured.
damage the product and may cause a fire.
(4) This product contains glass. The glass may break, causing
(3) If a foreign substance (such as water, metal, or liquid) gets injuries, if shock, vibration, heat, or distortion is applied to
inside the product, immediately turn off the power. the product.
Continuing to use the product, it is may cause fire or
electric shock. (5) The temperature of the glass of the display may rise to
80°C or more depending on the conditions of use.
(4) If the product emits smoke, and abnormal smell, or makes If you touch the glass inadvertently, you may be burned.
an abnormal sound, immediately turn off the power.
Continuing to use the product, it may cause fire or electric (6) If glass surface of the display breaks or is scratched, do
shock. not touch the broken pieces or the scratches with bare
hands. You may be injured.
(5) Do not disconnect or connect the connector while power to
the product is on. It takes some time for the voltage to drop (7) PDP Module requires to be handled with care not to be
to a sufficiently low level after the power has been turned touched with metal or hard materials, and must not be
off. stressed by heat or mechanical impact.
Confirm that the voltage has dropped to a safe level before
disconnecting or connecting the connector. (8) There are some exposed components on the rear panel of
this product. Touching these components may cause an
(6) Do not pull out or insert the power cable from/to an outlet electric shock.
with wet hands. It may cause electric shock.
(9) When moving the product, be sure to turn off the power
(7) Do not damage or modify the power cable. It may cause and disconnect all the cables. While moving the product,
fire or electric shock. watch your step. The product may be dropped or all,
leading to injuries of electric shock.
- 2 -
(10) In order to protect static electricity due to C-MOS circuitry of (21) This product has a glass display surface. Design your
the Drive part, wear a wrist band to protect static electricity system so that excessive shock and load are not applied to
when handling. the glass. Exercise care that the vent at the corner of the glass
panel is not damaged.
(11) If cleaning the Panel, wipe it with a soft cloth moistened with If the glass panel or vent is damaged, the product is
water or a neutral detergent and squeezed, being careful not inoperable.
to touch the connector part of the Panel. And don't use
chemical materials like thinner or benzene. (22) Do not cover or wrap the product with a cloth or other
covering while power is supplied to the product.
(12) If this product is used as a display board to display a static
image, "image sticking" occurs. This means that the luminance (23) Before turning on power to the product, check the wiring of
of areas of the display that remain lit for a long time drops the product and confirm that the supply voltage is within the
compared with luminance of areas that are lit for a shorter rated voltage range. If the wiring is wrong or if a voltage
time, causing uneven luminance across the display. outside the rated range is applied, the product may
The degree to which this occurs is in proportion to the malfunction or be damaged.
luminance at which the display is used. To prevent this
phenomenon, therefore, avoid static images as much as (24) Do not store this product in a location where temperature
possible and design your system so that it is used at a low and humidity are high. This may cause the product to
luminance, by reducing signal level difference between bright malfunction. Because this product uses a discharge
area and less bright area through signal processing. phenomenon, it may take time to light (operation may be
delayed) when the product is used after it has been stored for
(13) Because PDP Module emits heat from the Glass Panel part a long time. In this case, it is recommended to light all cells for
and the Drive circuitry, the environmental temperature must about 2 hours (aging).
not be over 40°C.
The temperature of the Glass Panel part is especially high (25) This product is made from various materials such as glass,
owing to heat from internal Drive circuitry. And because the metal, and plastic. When discarding it, be sure to contact a
PDP Module is driven by high voltage, it must avoid professional waste disposal operator.
conductive materials.
(26) If faults occur due to arbitrary modification or disassembly,
(14) If inserting components or circuit board in order to repair, be LG Electronics is not responsible for function, quality or other
sure to fix a lead line to the connector before soldering. items.
(15) If inserting high-power resistor(metal-oxide film resistor or (27) Use of the product with a combination of parameters,
metal film resistor) in order to repair, insert it as 10mm away conditions, or logic not specified in the specifications of this
as from a board. product is not guaranteed. If intending to use the product in
such a way, be sure to consult LGE in advance.
(16) During repairs, high voltage or high temperature components
must be put away from a lead line. (28) Within the warranty period, general faults that occur due to
defects in components such as ICs will be rectified by LGE
(17) This is a Cold Chassis but you had better use a cold without charge. However, IMAGE STICKING due to
transformer for safety during repairs. If repairing electricity misapplying the above (12) provision is not included in the
source part, you must use the cold transformer. warranty. Repairs due to the other faults may be charged for
depending on responsibility for the faults.
(18) Do not place an object on the glass surface of the display.
The glass may break or be scratched.
(19) This product may be damaged if it is subject to excessive
stresses (such as excessive voltage, current, or temperature).
The absolute maximum ratings specify the limits of these
stresses.
(20) The recommended operating conditions are conditions in
which the normal operation of this product is guaranteed. All
the rated values of the electrical specifications are guaranteed
within these conditions.
Always use the product within the range of the recommended
operating conditions. Otherwise, the reliability of the product
may be degraded.
- 3 -
[PDP42V5#### Module]
CONTENTS
¥ . Formation and Specification of Module
¥ Adjustment
.
¥ Trouble Shooting
.
1. Checking for No Picture
2. Hitch Diagnosis Following Display Condition
2-1. 4/7 or 3/7 of the screen doesn't be shown
2-2. Screen doesn't be shown as Data COF
2-3. It is generated unusual pattern of Data COF IC unit
2-4. Regular Stripe is generated about the quantity of one Data COF IC or more
2-5. Screen doesn't be shown at all as scan COF
2-6. Regular stripe is generated at regular internal on the whole screen
2-7. Data copy is generated to stripe direction
2-8. One or more stripe is generated on the screen
2-9. One or more horizontal line is generated on screen
2-10. Lightness of screen is wholly darken though there is input-signal-pattern
2-11. Different color is shown partially during full-white-screen or electric discharge is generated
during full-black-screen
2-12. Full-white pattern it happened that the lightness of middle is darken while full-white pattern
2-13. Some lightness of some color doesn't not generated well
¥ Block Diagram
.
¥· Records of Revision for Board and EPROM
.
* Annexing : Schematic Diagram
- 4 -
¥ . Formation and Specification of Module
External Cable Connection
NO Connector Input Signal
1 P1[Z SUS B/D] 5V, Va, Vs
2 P5[Y SUS B/D] 5V, Vs
3 P6[Y SUS B/D] 5V
4 P21, P31[CTRL B/D] Video Signal
NO Part No. Description
1 6871QCH025A PWB(PCB) ASSY TMDS CTRL B/D ASSY
2 6871QCH029A PWB(PCB) ASSY LVDS CTRL B/D ASSY
3 6871QDH051A PWB(PCB) ASSY Y DRV UPPER B/D ASSY
4 6871QDH052A PWB(PCB) ASSY Y DRV LOWER B/D ASSY
5 6871QRH034A PWB(PCB) ASSY X RIGHT B/D ASSY
6 6871QYH027A PWB(PCB) ASSY Y SUS B/D ASSY
7 6871QZH030A PWB(PCB) ASSY Z SUS B/D ASSY
- 5 -
¥ Adjustment
.
1. Application Object (2) Measuring the voltage Margin of Vs and deciding the voltage
This standard is applied to the PDP42V5#### PDP Module (3) Adjusting and checking the voltage of DC/DC pack
which is manufactured by the manufacturing team of PDP (Vsetup, Vscw, -Ve, -Vy)
promotion department or elsewhere. (4) Adjusting the voltage wave form of Vset-down
(5) Measuring the voltage Margin of Vset-up and deciding the
voltage
2. Notes (6) Adjusting the wave form of final voltage
(1) Without any special specification, the Module should be at
the condition of preliminaries more than 10minutes before
adjusting. 4. Adjusting the Board Group
- Service signal : 100% Full White signal (Applying the Jig Set)
- Service DC voltage : Vcc:5V, Va:65V, Vs:190V
- DC/DC Pack voltage : Vsetup:220V, Vscw:115V, 4-1. Using Tools
-Ve:-35V, -Vy:-75V (1) Digital oscilloscope : More than 200MHz
- Preliminaries environment : Temp (25!5°C), Relative (2) DVM(Digital Multimeter) : Fluke 87 or similar one
humidity (65!10%) (3) Signal generator : VG-825 or similar one
(4) DC power supply
(2) Module should get the Aging for the equilibrium after finish - DC power supply for Vs (1) : Should be changeable more
the assembling. Aging condition is shown below. than 0-200V/ more than 10A
- Service signal: 100% Full White, Red, Green, Blue pattern - DC power supply for Va (1) : Should be changeable more
signal(Service time of each pattern : within 5minutes/cycle) than 0-100V/ more than 5A
- Service DC voltage : Match the voltage with the set up - DC power supply for 5V (1) :Should be changeable more
voltage in the first adjustment. than 0-10V/ more than 10A
- Aging time : More than 4Hrs - DC-DC Convertor Jig (1) : The Jig which has voltage
- Aging environment : Temp (60!2°C), Relative humidity- equivalent output of PDP42V5#### Module after taking
Less than 75% the Vs, Va, 5V voltage
(3) Module adjustment should be followed by below sequence. - Voltage stability of power supply : Within !1% for Vs/Va,
- Setting up the initial voltage and adjusting the voltage within !3% for 5V
wave form of Vsetup
- Measuring the Margin of Vs voltage and deciding the voltage 4-2. Connection diagram of measuring
- Adjusting and checking the voltage of DC/DC pack instrument and setting up the initial
(Vsetup, Vscw, -Ve, -Vy) voltage
- Adjusting the voltage wave form of Vset-down
- Measuring the voltage margin of Vset-up and deciding (1) Connection diagram of measuring instrument
the voltage Refer to Fig. 1.(Connection diagram of measuring
- Adjusting the wave form of final voltage instrument that adjusting the voltage wave form)
But, these items above can be changed by the (2) Setting up the initial voltage
consideration of mass production. (When changing the Initially setting up voltage : Vcc:5V, Va:65V, Vs:190V
sequence, there should be an agreement of the Module But, Initially setting up voltage can be changed by the set
development 2Gr/ QA Gr/ Manufacturing Gr) up range according to the Module's characteristic.
(4) Without any special specification, you should adjust the 4-3. How to Adjust
Module in the environment of Temp (25!5°C) and Relative
humidity (65!10%) (1) Adjusting the Voltage Wave form of Vsetup
¤ Connect measuring instrument like the connection
Caution) If you let the still image more than 10 minutes(especially diagram Fig. 1.
The Digital pattern or Cross Hatch Pattern which has ¤L Turn on the power of the measuring instrument like the
clear gradation), after image can be presented in the item Fig. 1.
black level part of screen. ¤ØConnect the oscilloscope probe to P4 connector(80 Pin)
of Y-SUS PCB and GND.
¤OE Turn the VR1 of Y-SUS PCB and make the "A" wave
3. Adjustment items form Fig. 2 to be 25!5µs.
3-1. Adjusting the Board Group (2) Adjusting Vset-down Voltage Wave form
(1) Adjusting the voltage wave form of Vset-up
Turn the VR2 of Y-SUS PCB and make the "B" wave form
(2) Adjusting the voltage wave form of Vset-down
Fig. 2 to be 190!5µs.
(3) Adjusting the voltage wave form of Vramp
3-2 Adjustment after assembling (3) Adjusting Vramp Voltage Wave form
¤ Connect oscilloscope Probe to the B37(Pin) of Z PCB
(PDP Module adjustment)
(1) Setting up the initial voltage and adjusting the voltage and the GND of PCB
wave form of Vsetup
- 6 -
¤LTurn the VR3 of Z PCB and make the "C" wave form Fig. But, Initially setting up voltage can be changed by the set
3 to be 15!2µs. up range according to the Module's characteristic.
But, in case of not setting up the Test point, produce
same output and adjust wave form connect to other 5-3. How to Adjust
pattern or parts which has no possibility of short.
(1) Adjusting initial voltage wave form
Check the voltage wave form like the mentioned way on
the 4-3(How to adjust) and readjust the wave form when it
is wrong.
(2) Checking the DC/DC pack voltage
¤ Convert the signal of signal generator to the 100% Full
White signal
¤L Connect the GND terminal of DVM to the GND of Y B/D
and set the Plus terminal to the right up leg of R9 to
190±5µs check the -Ve voltage(-35!1V). And when there is
abnormality in voltage turn the variable resistor(VR7) of
DC/DC Pack(-Ve) on Y B/D to adjust.
wave form ¤Ø Connect the GND terminal of DVM to the R60's right leg
of the Y B/D and set the Plus terminal to the left leg of
R60 to check the Vscw voltage(115!1V) and when there
(Fig. 2) Y Set-up Wave form is abnormality in voltage turn the variable resistor(VR5)
of DC/DC Pack(Vscw) on Y B/D to adjust.
¤OE Connect the GND terminal of DVM to the R8's right leg
of the Y B/D and set the Plus terminal to the left leg of
R8 to check the -Vy voltage(-80!1V) and when there is
abnormality in voltage turn the variable resistor(VR6) of
DC/DC Pack(-Vy) on Y B/D to adjust.
¤º Connect the GND terminal of DVM to the R89's right leg
of the Y B/D and set the Plus terminal to the left leg of
(Fig. 3) Z ramp Wave form R89 to check the Vsetup voltage(240!1V) and when
there is abnormality in voltage turn the variable
resistor(VR4) of DC/DC Pack(Vsetup) on Y B/D to adjust.
5. Adjustment after Assembling (3) Measuring the Vs voltage Margin and deciding
(PDP Module Adjustment)
the voltage
5-1. Using Tools ¤ Convert the signal of signal generator to the 100% Full
(1) Digital oscilloscope : More than 200MHz Red signal.
(2) DVM(Digital Multimeter): Fluke 87 or similar one ¤L Turn the voltage adjusting knob of Vs DC power supply
(3) Signal generator: VG-825 or similar one to the voltage -down direction and make the cell of
(4) DC power supply screen turned off.
- DC power supply for Vs (1) : Should be changeable more ¤Ø Turn the voltage adjusting knob of Vs DC power supply to
than 0-200V/ more than 10A the voltage -up direction until the cell of screen turned on.
- DC power supply for Va (1) : Should be changeable more The first voltage, which make the cell of full screen
than 0-100V/ more than 5A turned on, is named as Vsmin1 and record it.
- DC power supply for 5V (1) : Should be changeable more ¤OE Turn the voltage adjusting knob of Vs DC power supply
than 0-10V/ more than 10A to the voltage-up direction slowly until the cell of screen
- DC-DC Converter Jig (1) : The Jig which has voltage turned off or over electric discharge.
equivalent output of PDP42V5#### Module after taking The first voltage, which makes the cell of screen turned
the Vs, Va, 5V voltage off or over electric discharge, is named as Vsmax1 and
- Voltage stability of power supply : Within !1% for Vs/Va, records it. (Only, Vs voltage variable passes over the
within !3% for 5V maximum 195V)
¤º Convert the signal of signal generator to the 100% Full
5-2. Connection diagram of measuring Green signal.
instrument and setting up the initial ¤ Repeat the adjustment (2) item and name each voltage
as Vsmin2/Vsmax2 and record them.
voltage ¤ Convert the signal of signal generator to 100% Full Blue
(1) Connection diagram of measuring instrument signal.
Refer to figure 1. (Connection diagram of measuring ¤ Repeat the adjustment (2) item and name each voltage
instrument that adjusting the voltage wave form) as Vsmin3/Vsmax3 and record them.
¤ Convert the signal of signal generator to 100% Full
(2) Setting up the initial voltage White signal.
Initially setting up voltage : Vcc:5V, Va:65V, Vs:190V ¤ Repeat the adjustment (2) item and name each voltage
as Vsmin4/Vsmax4 and record them.
- 7 -
¤æ Convert the signal of signal generator to 100% Full Black
signal.
¤ Repeat the adjustment (2) item and name each voltage as
Vsmin5/Vsmax5 and record them.
¤ At this time decided Vs voltage (Vsmin1-Vsmin5)adds 6V to
Max value and set up the voltage within the set-up
range(180V < Vs # 195V) in consideration of other
features.
¤ Turn the voltage adjusting knob of Vs DC power supply
make deciding the Vs voltage.
¤i Adjust Vset down wave form using setting up Vs voltage
like mentioned on the 4-3.
(4) Adjusting the final voltage wave form
Check the voltage wave form like the mentioned way on the 4-
3(How to adjust) and readjust the wave form when it is twisted.
(5) DC-DC Pack Voltage Set up Range
Vsetup : 210V ~ 240V
Vsc : 90V ~ 120V
-Vy : -60V ~ -80V
-Ve : -35V ~ -45V
- 8 -
E/X Tube
Y - SUS
Y - SUS
Z - SUS
CONTROLLER
CONTROLLER X right
5 2.5 voltage
DC Power Supply for 5V
voltage
65 0.1
DC Power Supply for Va
Power 190 1.0 voltage
Àü¿ø
DC Power Supply for Vs
Signal Generator (VG-825 )
(1) The power of the signal generator should be turned on before turning on the power of DC power supply.
(2) The voltage of DC power supply , in standard of Module input voltage, should be preset as below.
Vcc: 5V, Va: 65V, Vs: 190V
(3) The power of power supply must turned on by this sequence. Reverse direction When turning off.
* Module on : 5V ( Va ( Vs, Module off: Vs ( Va ( 5V
(4) Signal generator should be selected with 852*480 mode(WVGA)
(Fig. 1) Connection diagram of measuring instrument
- 9 -
¥. Trouble Shooting
1. Checking for no Picture
A screen doesn¡fldisplay at all and condition of black pattern or power off.
t
(1) Check whether the CTRL B/D LED(D1~D4) is turned on or not.
(2) Check the power and signal cable of CTRL B/D.
(3) X B/D, Y B/D, Z B/D is well plugged in.
(4) Check the connection of X B/D, Y B/D and Z B/D to CTRL B/D.
(5) Measure the output wave of X, Y, Z B/D with oscilloscope(more than 200MHz)
and find the trouble of B/D by comparing the output wave with below figure.
- Measure Point fo Y B/D : TP (Connector P4 80 pin)
- Measure Point fo Z B/D : Connection part of panel (SUS_OUT)
- Measure Point fo X B/D : L1(RIGHT), L2(LEFT BOTTOM)
(6) Check the SCAN(Y side) IC
(7) Check the DATA(X side) COF IC
(8) Replace the CTRL B/D.
- 10 -
- 11 -
2. Hitch Diagnosis Following
Display Condition
2-2. The screen doesn't be shown as Data
2-1. 4/7 or 3/7 of the screen doesn't be COF
shown (Include not be shown part of Data COF quantity or a part)
(1) Confirm the power connector of X B/D is well plugged in (1) The problem between Data COF and X B/D is more
which is correspond to not showing screen. possible that the screen is not be shown as data COF.
(2) Confirm the connector that is connected between CTRL (2) Confirm the connector of Data COF is well connected to X
B/D and X B/D correspond to not showing part. B/D. Correspond to the part that screen is not showing
(3) Replace relevant X B/D. (3) Confirm whether the Data COF is failed and replace X B/D
[ Relationship between screen and X B/D [ Example of the screen display form
(Anything of the 7 Data COF can be shown beside below
Screen X B/D pictures)
Left of the Screen 4/7 <--> Right X B/D
Right of the Screen 3/7 <--> Left X B/D
[ Screen Display Form : All
: Partial
: not at all
[ How to examine Data COF IC
Left of the Screen(4/7) Right of the Screen(3/7)
Display
Not display
2
Resistance
1 GND
1 ANODE Pattern (GND)
2 CATHOD Pattern and examine the Diode
to the pure or reverse direction.
Measure the third resistance value
- 12 -
2-3. It Generates Unusual Pattern of Data 2-4. Regular Stripe is Generated about the
COF IC unit Quantity of one Data COF IC or more
(1) In case of generating unusual pattern of Data COF IC unit (1) In case of generating regular stripe about the quantity of
as below picture, there is problem in the check that is input one Data COF IC, there is problem at the output of output-
into Data COF IC flatworm of X B/D
(2) In case of In case of generating regular stripe about the quantity of
- confirm the connection of Data COF connector two Data COF IC, that means the data which is conveyed
- replace the relevant X B/D from CTRL B/D doesn't conveyed well.
(3) In case of (2) Confirm the XB/D connection connector plugged in well.
- confirm the connector that is connected from CTRL to X B/D Correspond to unusual screen.
- Replace relevant XB/D or CTRL B/D (3) Replace relevant XB/D or CTRL B/D.
[ Screen Display Form [ Relationship between screen and X B/D
Unusual screen comes out Screen X B/D
about one IC quantity in Left Bottom of the Screen 4/7 <--> Right X B/D
one COF
Right Bottom of the Screen 3/7 <--> Left X B/D
Unusual screen comes out
across one quantity about
two IC quantities in one
COF [ Screen Display Form
Unusual screen comes out It comes out partial field about
about 4IC quantities in the quantity of one IC or more
one COF
or It may come out together
at other field of screen.
Unusual screen comes out
as a unit of Data COF IC
through one X B/D
Unusual screen comes out
as a unit of Data COF IC
through Top or Bottom
screen
- 13 -
2-5. The screen display has a problem for 2-6. The screen has a vertical line with
Scan FFC. regular gap.
(A vertical stripe flash at especial color)
(1) It's may be a problem between Scan FFC and Y B/D.
(2) Check the connection of Y B/D and Scan COF. (1) This is a problem about control B/D.
(3) If the Scan IC is failed, replace the Y DRV B/D. (2) Replace Control B/D.
[ Screen Display Form
[ Screen Display Form
one eighth
of screen
The screen display is very good
The screen display is a poor
The screen has a vertical line
with regular gap
[ Check a method of SCAN IC
2-7. A data copy is happened into vertical
direction
(1) In this case, it's due to incorrect marking of scan wave.
(2) Replace a Y DRV B/D or Y SUS B/D.
[ Screen Display Form
Change the Vpp Pin into ANODE and GND Pin into CATHOD
and then test the Diode with forward or reverse direction.
- 14 -
2-8. The screen has one or several vertical 2-11. The screen displays other color
line partially on full white screen or happens
discharge partially on full black screen.
(1) In this case, It isn't a problem about controller B/D or X
B/D. (1) Check the declination of Y B/D set up, set down wave.
(2) It may cause followings. (2) Check the declination of Z B/D ramp wave.
- It's out of order a panel (3) Measure each output wave with oscilloscope(more than
- Open or short of DATA COF FPC attached panel 200MHz) and compare the data with below figure data.
- It's out of order a DATA COF attached panel Adjust the Y B/D set up(Test-up:B/C[¥s/¥s])/setdown(Test-
down:D[¥s]) and Z B/D ramp(Tramp:F/G[¥s/¥s]) declination
(3) Replace Module. by changing VR1/VR2/VR3.
- Measuring Point of Y B/D : P4 (Connector P4 36 pin)
- Measuring Point of Z B/D : B37 (SUS_OUT)
[ Screen Display Form
It may show several vertical
lines in a quarter or other
division part of screen
including left case.
Y Output Voltage Wavefrom Z RAMP Voltage Wavefrom
2- 9. The screen has one or several
horizontal line
2-12. A center of screen is darker than
a edge of screen at full white pattern.
(1) In this case, it isn't a problem about controller B/D or X
B/D. (1) In this case, it's a problem about Z B/D ramp wave.
(2) It may cause followings. (2) Check the connection cable of Z B/D and CTRL B/D.
- It's out of order a panel (3) Replace the Z B/D.
- Open or short of SCAN FPC attached panel
- It's out of order a SCAN IC attached panel
(3) Replace Y DRV B/D [ Screen Display Form
[ Screen Display Form
It may show several horizontal
lines including left case.
2-13. It doesn't display a specified
2-10. The screen displays input signal brightness at specified color
pattern but the brightness is dark
(1) Check the connector of CTRL B/D input signal.
(1) In this case, Z B/D operation isn't complete. (2) Replace the CTRL B/D.
(2) Check the power cord of Z B/D.
(3) Check the connector of Z B/D and Controller B/D.
(4) Replace the Controller B/D or Z B/D.
- 15 -
¥. Block Diagram
- 16 -
¥·. Records of Revision for Boards and ROM DATA
1. Board
No. Date Board Part Number Note
1 2003.04.21 CTRL B/D ASSY(TMDS) 6871QCH025A Initial Product
2 2003.04.21 CTRL B/D ASSY(LVDS) 6871QCH029A Initial Product
3 2003.04.21 YDRV Upper B/D ASSY 6871QDH051A Initial Product
4 2003.04.21 YDRV Lower B/D ASSY 6871QDH052A Initial Product
5 2003.04.21 Y SUS B/D ASSY 6871QYH027A Initial Product
6 2003.04.21 Z SUS B/D ASSY 6871QZH030A Initial Product
7 2003.04.21 X RIGHT B/D ASSY 6871QRH034A Initial Product
- 17 -
2. ROM DATA
No. Date ROM Data Version Contents
1 2003.04.21 42V5_06 Initial ROM Data of TMDS
2 2003.04.21 42V5_08 Initial ROM Data of LVDS
- 18 -
June, 2003
3828VD0143E Printed in Korea
PDP Instruction Manual for customers
Model 42V5
ver 1.01
CONTENTS
INTRODUCTION
PRECAUTIONS
BASIC
TROUBLE SHOOTING
This manual is for the 42" V5 model.
Basic rules are same with 42" V5 for other models.
1. Introduction
1.1PDP module
PDP module is composed with PANEL part and DRIVE part. Panel is consist of electrode, phosphor, dielectric, gas.
And drive part is made up of electronic circuit (X , Y-sus, Z sus, Y drv,PSU,CTRL B/D) and PCB.
3
1. Introduction
1.2 About 42V5 model
X means XGA resolution (1024 768) .
using dual scan method
V5 shows 1000:1 contrast ratio and 1000cd.
So V5 called as KK model.
1.3 The purpose of this manual
1. We want to communicate harmoniously by educating a defect phenomenons and terms
to send LG Electronics a message that includes a detail articles of defect panel.
2. Let customers can distinguish module defect(LG Electronics defect) and a defect from their work by
educating an early analysis for SET maker .So customers can decide easily whether it is LG defect or customer's.
3. Prevent defects which is made during set assembly process previously by educating
Work precautions and conditions.
Since mixed terms may cause confusion. Please use the formal terms which in this manual.
4
1. Introduction
42 inch V5 MODEL.
Y DRV TOP Z-SUS B/D
Y-SUS B/D
IPM
Y-DRV BTM
CONTROL B/D + X-LEFT B/D X-RIGHT B/D
5
1. Introduction
1.4 Definitions
Definition of MODULE position
* Back side of module long 1
E/X Tube
Exhaust
hole short 2
Y-SUS
Z - SUS
short 1
long 2
CONTROLLER
Signal Input
(R,G,B,H/Vsync.) X right
COF long2-1 ········ COF long 2-7
PDP Module S/N
When you request LG to repair PDP module, Please inform LG the Module S/N for tracking the module's history by e-system
Model Name
Bar Code (Code 128, Contains the manufacture No.)
Manufacture No.
The trade name of LG Electronics
Manufactured date (Year & Month)
Module SERIAL NO. The place Origin
Model Suffix
6
1. Introduction
Voltage label (Attached on back side of module)
Part No. label (Attached on board) BOARD ASS`Y
PART NO.
BOARD NAME
BOARD SERIAL NO.
PCB PART NO.
COF serial No. label (attached on COF)
COF SERIAL NO.
7
1. Introduction
Terms of defect
8
2. Precaution
2.1 Safety precautions
Be sure to read this before repair. When using/ handling this PDP module, Please pay attention to the
below warning and cautions.
1. Before repairing there must be a preparation for 10 min.
2. Be aware of metalic particles to prevent short circuit .
3. Do not impress a voltage that higher than represented on the product.
4. Since PDP module uses high voltages, Be careful a electric shock
and after removing power some current remains in drive circuit.
so you can touch circuit after 1 min.
5. Drive circuits must be protected from static electricity.
6. The PDP module must be Moved by two man.
7. Be careful with short circuit of PDP boards when measuring any voltages.
2.2 Before service request
1. Check panel surface and appearance of B/D.
2. Check the model label. Whether it is boards of same model with label.
3. Before requesting Service, please inform us a detail defect phenomenon and history of module document.
it can be helpful to us for a smooth service.
Ex) COF long 2-1 fail ,address 1 line open, Y b/d problem , mis-discharge.
9
2. Precaution
2.3 Handle with care (COF)
COF is the most important component in the PDP module.
Even a little imperfection of COF can make a serious screen problem.
TEARING
These must not happen in assemby process
BEING PUSHED
SCRATCHING
BENDING CHOPING
10
3. Basic
1. X B/D
: X board have two kind of funtion one is an addressinng and another is a path. It receives LOGIC signal from
CONTROL B/D and make ADDRESS PULSE(generates Address discharge)by ON/OFF operation of FET , and supplies
this waveform to COF(data) as a path.
X LEFT B/D
Signal part
Signal part
X RIGHT B/D
Power part
Power part
11
3. Basic
2. Z sustain B/D
: make SUSTAIN PULSE and ERASE PULSE that generates
SUSTAIN discharge in panel by receiving LOGIC signal from
CONTROL B/D.
this waveform is supplied to panel through FPC(Z).
*composed with IPM,FET,DIODE, electrolytic capacitor ,E/R coil.
* IPM (Intelligent Power Module)
E/R(Energy recovery)
12
3. Basic
3. Y drive B/D
1) This is a path to supply SUSTAIN ,RESET waveform which made
from Y SUSTAIN B/D to panel through SCAN DRIVER IC.
2) Supply a wave form that select Horizontal electrode (Y SUSTAIN electrode)
sequentially.
- potential difference is 0V between GND and Vpp of DRIVER IC
in SUSTAIN period.
- being generated potential difference between GND and Vpp only
Scan drive IC
in SCAN period.
* In case of 42" X1 use DRIVER IC IC 12 EA (TOP, BOTTOM: each 6EA)
13
3. Basic
4. Y sustain B/D
: generates SUSTAIN,RESET waveform, Vsc(SCAN)voltage.
and supplies it Y DRIVER B/D.
* Composed with IPM,DIODE, electrolytic capacitor ,FET.
5. Control (logic) Board
: creates signal processing (Contour noise,reduction ISM,..)
and an order of many FET on/off of each DRIVER B/D with
R,G,B each 8bit input.
* Use 3.3V/5V 2 kinds of power .
MCM(Multi Chip Module)
14
3. Basic
6. FPC (Flexible Printed Circuit)
: supply a driving waveform to PANEL by connecting a PAD
electrode of PANEL with PCB(Y and Z).
* there is two type of this for Y B/D. One is single-sided,
another is double-side. These are having pattern on it
* for Z B/D, there is no pattern , single-sided, and Beta
type(all of copper surface).
7. FFC (Flat Flexible Cable)
: for connecting a Logic signal between B/D and B/D.
*There is 0.5mm pitch,50pin type
1mm pitch ,30pin type.
15
3. Basic
8. COF (Chip On Film)
: supply a waveform which made from X B/D to panel and select
a output pin that is controlled by COF when be on or off.
96 output pin per IC.
the more the resolution higher, the less spare space where
can set IC on it in B/D. without using IC PACKAGE,
we use a BARE IC , so we can get IC with LOW COST
because we do not solder IC on PCB directly,
a soldering defect rate decrease.
* composition Bare IC
1) FPC + Heat /Sink
FPC for COF must have a Low Spec decline with getting damp
2) CHIP resistor + CHIP CAPACITOR
* 42 V6 COF is the same as 42V5.
3) BARE IC (STV7610A/WAF) + GOLD WIRE/AL WIRE
4) EPOXY MOLDING
16
3. Basic
9. IPM(Intelligent Power Module)
: composition
HEATSINK,CAPACITOR
DIODE
IC LINEAR
RESISTOR, TRANSISTOR, FETS.
: description
Attached at Z B/D and Y B/D, make Sustain waveform.
Sustainer : supply a square wave to panel to make a video.
Sustain Step
IPM
17
4. Trouble shooting.
Fast check up
defect
Check model No. of module , all connectors and cables.
Y
No display? Check panel appearance Check all FUSE. Check PSU output (Va,Vs,5v).
N
Check Y, Z b/d input voltage Replace ctrl b/d Replace Y, Z b/d
Y
vertical defect? Check panel appearance Check COF Replace X b/d Replace ctrl b/d
N
Y
Horizontal defect? Check FPC Replace Y drv b/d Replace Y sus b/d Replace ctrl b/d
N
Y
Mal discharge Replace ctrl b/d
Replace Y drv b/d Replace Y sus b/d
on screen?
18
4. Trouble shooting.
Logical judgment
What kind of defect ?
Y
No display? Please follow the no display trouble shooting.
N
Y
vertical defect? Bar defect appeared? Please follow bar defect trouble shooting.
N
Y Line defect
Horizontal defect?
N Please follow the line defect trouble shooting.
mal discharge Y
on screen? Please follow the mal discharge trouble shooting.
19
4. Trouble shooting.
No display
1. Connector
Confirm every Connector (PSU, Y-SUS, CTRL, Z-SUS)
module may not be normal by mis-connection which can not send signal and power.
Also Mis connection for a long time has a specific b/d failed.
20
4. Trouble shooting.
2. Exhaust tip Crack
Confirm exhausting Tip and find Crack with eyes to check the vacuum state of panel.
If there is problem replace the module .
in case of vacuum breakdown, module makes a shaking noise because of inside gas ventilation.
(there may be a small crack which could not see with naked eyes. And this noise is different from Capacitor noise. )
NORMAL CRACKED
21
4. Trouble shooting.
3. PSU(Power Supply Unit)
1. Check each unit part of PSU inside with naked eyes.
(capacitor, FET, a kind of IC, resistor)
2. Check SW on Normal.
3. Check Output voltage which is converted from AC V
SW Normal
to DC V.
voltage Check (5V, Va, Vs)
When PSU Protection occurred. Check Short
Vs Voltage ADJ
between Y-SUS, Z-SUS B/D .
(Vs : About 180 ~195 V)
Confirm Adjust
if not same
input voltage voltages
Va Voltage ADJ
Va : About 55 ~65 V
Multi-meter Touch point
(5V, Va ,Vs must accord with Module Label)
22
4. Trouble shooting. Diode
Input voltage P300
4. Ctrl B/D
1. Confirm LED D17(flashing) ,13 lighting
2. If not CHECK OSC X1 output.
3. Check CTRL input voltage.
4. CHECK 3.3V, 5V.
5. Check IC 404 3.3V
IC 54 2.5V
OSC(X2)
Probe
Touching
point
Check oscillating state.
(normal 100 MHZ)
Be careful with physical shock.
23
4. Trouble shooting.
Ve -Vy Vscw FS2
5. Y-sus B/D
1. Check FUSE [FS2(Va) ,FS3(Vs)]. Vsetup
2. Check voltages(Vsetup,-Vy, Vscw)
3. Check DIODE between GND and Y SUS output.
[SUSUP(OC2) SUSDN(OC1)].
forward=0.4 ,reverse=OVERLOAD. setup
4. Check whether output voltages agrees
with voltage that represented in label.
F2(Vs) FUSE 6.3A
setdn
Check whether output voltages agrees with voltage that represented in label.
24
4. Trouble shooting.
6. Z-sus B/D
1. Check the FUSE.
2. Check input voltages.(Va, 5V,Vs)
3. Check FPC out put diode value.
4. Check ramp waveform.
Check the FUSE Check input voltages Variable resistor of Z RAMP waveform slope.
Va FUSE 6.3V
Vs FUSE 6.3A
Variable resistor
25
4. Trouble shooting.
Separate the fixed Screw of Z-Board. Condition in Lock part is pulled Pull FPC Connector
Pull out Lock as shown in arrow. as shown in arrow.
26
4. Trouble shooting.
Power protection
It is power protection when power is off automatically within 2~3 min. from power on.
Power protection function protect the boards when occurred short on circuits of PDP module or power problem.
If can not impress power even after replacing PSU, find out where the short occurred.
* PSU makers.
DAEGIL PSU ORIGIN PSU
(diode on board) (No diode)
27
4. Trouble shooting.
Vertical defect (bar)
1. Connector
Check COF connector.
If not connected well,it will Make a bar defect .
Check here
Bar
Check here Off
28
4. Trouble shooting.
2. Checking COF
Confirm whether COF was torn. And then check input of COF resistor and IC.
COF 6 is torn partly
Tearing
Lift up lock as shown Pull COF
in narrow. as shown in narrow.
29
4. Trouble shooting.
Checking address COF input of resistor and IC
COF resistor checking
Check the both side of resistor With Digital multi meter(DMM) .
If the resistor is normal, the resistor value will be 10.2 ~ 10.8
Resistor
COF short circuit check
Check the short circuit between Va and GND short.
If it is short, cof is failed.
Va GND
30
4. Trouble shooting.
Checking address COF input of resistor and IC
IC input checking
Inside of IC , there is 4 ea diodes which separated in 2 series .
(input 2, output 2)
how to check
1.contact DMM + terminal to a right terminal of condenser(GND)
and DMM - terminal to a right terminal of IC, normal value is 0.68 (fig.1)
2.contact DMM - terminal to Output terminal of resistor, and
DMM + terminal to a right terminal of IC , normal value is 0.745 (fig.2)
Confirm this position.
Fig. 1 Fig. 2
31
4. Trouble shooting.
3. Ctrl B/D
CTRL B/D supplies video signal to COF. So if there is a bar defect on screen,
It may be the ctrl b/d problem.
A flow of address signal
In this figure, we can easily suppose
what will be appeared on screen when a specific part failed.
Buffer
IC
96 output
32
4. Trouble shooting.
Vertical defect (line)
1 line open or short
This phenomenon is due to COF IC inside short or adherence part of the Film and rear panel electrode problem.
In this case, replace the panel.
1 line open
1 electrode open
Line open or short with same distance.
This is an MCM of Ctrl