LG 42V5 User manual

ver 1.01
PDP Instruction Manual for customers
Model 42V5

CONTENTS
INTRODUCTION
PRECAUTIONS
BASIC
TROUBLE SHOOTING
This manual is for the 42” V5 model.
Basic rules are same with 42” V5 for other models.

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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.

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1.2 About 42V5 model
X means XGA resolution (1024Ⅹ768) .
using dual scan method
V5 shows 1000:1 contrast ratio and 1000cd.
So V5 called as KK model.
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.
1. Introduction
▶Since mixed terms may cause confusion. Please use the formal terms which in this manual.
1.3 The purpose of this manual

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42 inch V5 MODEL.
1. Introduction
Y-DRV BTM
X-LEFT B/D
CONTROL B/D X-RIGHT B/D
IPM
Z-SUS B/D
+
Y-SUS B/D
Y DRV TOP

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1.4 Definitions
Y-SUS
CONTROLLER
Z - SUS
Signal Input
(R,G,B,H/Vsync.)
E/X Tube
X right
Exhaust
hole
long 1
long 2
short 1
short 2
COF long2-1 •••••••• COF long 2-7
▶Definition of MODULE position
* Back side of module
1. Introduction
①Model Name
②Bar Code (Code 128, Contains the manufacture No.)
③Manufacture No.
④The trade name of LG Electronics
⑤Manufactured date (Year & Month)
⑥The place Origin
⑦Model Suffix
①
②
③
④⑤⑥
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
Module SERIAL NO.

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▶Voltage label (Attached on back side of module)
▶Part No. label (Attached on board)
▶COF serial No. label (attached on COF) PCB PART NO.
BOARD ASS`Y
PART NO.
BOARD NAME
COF SERIAL NO.
1. Introduction
BOARD SERIAL NO.

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▶Terms of defect
1. Introduction
Add short (light on) Add open (light off) Sus short (light on) Sus open (light off)
Add bar (light off) Mal discharge Cell defect Add short (light on)

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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. Precaution
2.1 Safety precautions
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.
1. Check panel surface and appearance of B/D.
▶Be sure to read this before repair. When using/ handling this PDP module, Please pay attention to the
below warning and cautions.
2.2 Before service request
2. Check the model label. Whether it is boards of same model with label.

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SCRATCHING
TEARING
BENDING CHOPING
COF is the most important component in the PDP module.
Even a little imperfection of COF can make a serious screen problem.
2.3 Handle with care (COF)
2. Precaution
These must not happen in
These must not happen in assemby assemby process process BEING PUSHED

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X LEFT B/D
X LEFT B/D
X RIGHT B/D
X RIGHT B/D
3. Basic
: 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.
Power part
Power part
Signal part
Signal part
1. X B/D

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: 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.
3. Basic
2. Z sustain B/D
* IPM (Intelligent Power Module)
E/R(Energy recovery)

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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
in SCAN period.
* In case of 42” X1 use DRIVER IC IC 12 EA (TOP, BOTTOM: each 6EA)
3. Basic
Scan drive IC
3. Y drive B/D

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:generates SUSTAIN,RESET waveform, Vsc(SCAN)voltage.
and supplies it Y DRIVER B/D.
* Composed with IPM,DIODE, electrolytic capacitor ,FET.
: 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 .
5. Control (logic) Board
4. Y sustain B/D
3. Basic
MCM(Multi Chip Module)

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: 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).
: for connecting a Logic signal between B/D and B/D.
*There is 0.5mm pitch,50pin type
1mm pitch ,30pin type.
6. FPC (Flexible Printed Circuit)
7. FFC (Flat Flexible Cable)
3. Basic

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: 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
1) FPC + Heat /Sink
⇒FPC for COF must have a Low Spec decline with getting damp
2) CHIP resistor + CHIP CAPACITOR
3) BARE IC (STV7610A/WAF) + GOLD WIRE/AL WIRE
4) EPOXY MOLDING
8. COF (Chip On Film)
Bare IC
* 42 V6 COF is the same as 42V5.
3. Basic

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: 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.
9. IPM(Intelligent Power Module)
3. Basic
IPM
Sustain Step

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Horizontal defect?
vertical defect?
Mal –discharge
on screen?
No display?
defect
Check model No. of module , all connectors and cables.
Check panel appearance Check PSU output (Va,Vs,5v).
Check Y, Z b/d input voltage Replace ctrl b/d Replace Y, Z b/d
Check panel appearance Check COF Replace ctrl b/d
Replace X b/d
Check FPC Replace Y drv b/d Replace Y sus b/d Replace ctrl b/d
Replace Y drv b/d Replace Y sus b/d
4. Trouble shooting.
N
Y
Y
Y
Y
N
Fast check up
(Include exhausting tip, GLASS crack)Check all FUSE.
N
Replace ctrl b/d

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4. Trouble shooting.
Logical judgment
What kind of defect ?
Y
Horizontal defect?
vertical defect?
mal –discharge
on screen?
No display? Please follow the no display trouble shooting.
N
Bar defect appeared?
Line defect
YPlease follow bar defect trouble shooting.
N
N
Y
Please follow the line defect trouble shooting.
YPlease follow the mal discharge trouble shooting.

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Check each section with following method if there is problem, replace or repair that part.
If not go to the next section.
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.
Signal input(LVDS)
CTRL B/D + Y-SUS CTRL B/D + Z-SUS X-B/D + X-B/D