LG 50PV450 User manual

Training Manual
50PV45050PV450 PlasmaPlasma DisplayDisplay
A
dvanced Single Scan Troubleshooting
50" Class Full HD 1080p Plasma TV
(49.9" diagonally)
Published May 13
th
, 2011

Preliminary:
Contact Information Preliminary Matters Specifications
Overview of Topics to be DiscussedOverview of Topics to be Discussed
Troubleshooting:
Contact
Information
,
Preliminary
Matters
,
Specifications
,
Plasma Overview, General Troubleshooting Steps,
Disassembly Instructions, Voltage and Signal Distribution
Y
SUS B d
Troubleshooting:
Circuit Board Operation, Troubleshooting and Alignment of :
• Switch Mode Power Supply No “VS On” command input to SMPS from the Main Board.
•
Y
-
SUS
B
oar
d
• Z-SUS Board Uses a Z-SUB Board for panel drive connection.
• Y-Drive Boards (1 Upper and 1 Lower).
• Control Board
• X Drive Boards (3)
•
Main Board
:
Drives 15 TCPs (5 per/board). Each TCP drives 384 vertical electrodes.
•
Main
Board
:
• Interconnect Diagram: 11X17 Foldout Section used as a quick reference sheet.
• Front IR/Intelligent Sensor
May 2011 50PV450 Plasma
2

50PV450
Pl Di l
Preliminary MattersPreliminary Matters
50PV450
Pl
asma
Di
sp
l
ay
Section 1
This Section will cover Contact Information and remind the Technician of Important
Safety Precautions for the Customer’s Safety as well as the Technician’s and the
Equipment.
Basic Troubleshooting Techniques which can save time and money sometimes can
be overlooked. These techniques will also be presented.
This Section will get the Technician familiar with the Disassembly, Identification and
Layout of the Plasma Display Panel.
At th d f thi S ti th T h i i h ld b bl t Id tif th Ci it
At
th
e en
d
o
f
thi
s
S
ec
ti
on
th
e
T
ec
h
n
i
c
i
an s
h
ou
ld
b
e a
bl
e
t
o
Id
en
tif
y
th
e
Ci
rcu
it
Boards and have the ability and knowledge necessary to safely remove and
replace any Circuit Board or Assembly.
May 2011 50PV450 Plasma
3

LG Contact InformationLG Contact Information
Customer Service (and Part Sales) [phone]
Technical Support (and Part Sales)
(800) 847
7597
Technical
Support
(and
Part
Sales)
(800)
847
-
7597
USA Website (GSFS) http://gsfs-america.lge.com
Customer Service Website http://www.us.lgservice.com
Knowledgebase Website http://lgtechassist.com
LG Web Training https://lge.webex.com Presentations with Audio/Video
and Screen Marks
New: 2010 Models Wireless
Ready Software Downloads
LG CS Learning Academy http://ln.lge.com/ilearn http://136.166.4.200
Training Manuals, Schematics with Navigational Bookmarks, Start-Up Sequence, Owner’s Guides,
Int
e
r
co
nn
ec
t Di
ag
r
a
m
s,
Dim
e
n
s
i
o
n
s,
Co
nn
ec
t
o
r ID
s,
Pr
oduc
t Pi
c
t
u
r
es
a
n
d
F
ea
t
u
r
es
.
Also available on the Plasma Page:
PDP Panel Alignment Handbook,
Plasma Control Board ROM Update (Jig required)
e co ec ag a s, e s o s, Co ec o s, oduc c u es a d ea u es
Published May 2011 by LG Technical Support and Training
LG Electronics Alabama
,
Inc.
May 2011 50PV450 Plasma
4
,
201 James Record Road, Huntsville, AL, 35813.

IMPORTANT SAFETY NOTICEIMPORTANT SAFETY NOTICE
Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)
IMPORTANT
SAFETY
NOTICEIMPORTANT
SAFETY
NOTICE
The information in this training manual is intended for use by persons possessing an adequate
background in electrical equipment, electronic devices, and mechanical systems. In any attempt
to repair a major Product personal injury and property damage can result The manufacturer or
to
repair
a
major
Product
,
personal
injury
and
property
damage
can
result
.
The
manufacturer
or
seller maintains no liability for the interpretation of this information, nor can it assume any
liability in conjunction with its use. When servicing this product, under no circumstances should
the original design be modified or altered without permission from LG Electronics. Unauthorized
modifications will not only void the warranty but may lead to property damage or user injury
modifications
will
not
only
void
the
warranty
,
but
may
lead
to
property
damage
or
user
injury
.
If wires, screws, clips, straps, nuts, or washers used to complete a ground path are removed for
service, they must be returned to their original positions and properly fastened.
CAUTIONCAUTION
CAUTIONCAUTION
To avoid personal injury, disconnect the power before servicing this product. If electrical power is
required for diagnosis or test purposes, disconnect the power immediately after performing the
necessary checks Also be aware that many household products present a weight hazard
necessary
checks
.
Also
be
aware
that
many
household
products
present
a
weight
hazard
.
At least two people should be involved in the installation or servicing of such devices.
Failure to consider the weight of an product could result in physical injury.
May 2011 50PV450 Plasma
5

ESD NoticeESD Notice (Electrostatic Static Discharge)(Electrostatic Static Discharge)
Preliminary Matters (The Fine Print)Preliminary Matters (The Fine Print)
Today’s sophisticated electronics are electrostatic discharge (ESD) sensitive. ESD can weaken or damage
the electronics in a manner that renders them inoperative or reduces the time until their next failure.
Connect an ESD wrist strap to a ground connection point or unpainted metal in the product. Alternatively,
you can touch your finger repeatedly to a ground connection point or unpainted metal in the product. Before
removing a replacement part from its package touch the anti
-
static bag to a ground connection point or
removing
a
replacement
part
from
its
package
,
touch
the
anti
-
static
bag
to
a
ground
connection
point
or
unpainted metal in the product. Handle the electronic control assembly by its edges only. When
repackaging a failed electronic device in an anti-static bag, observe these same precautions.
Rl If iRl If i
R
egu
l
atory
I
n
f
ormat
i
on
R
egu
l
atory
I
n
f
ormat
i
on
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
f
inter
f
erence when the equipment is operated in a residential installation. This equipment generates, uses,
and can radiate radio frequency energy, and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful interference to
radio or television reception, which can be determined by turning the equipment off and on, the user is
radio
or
television
reception,
which
can
be
determined
by
turning
the
equipment
off
and
on,
the
user
is
encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate
the receiving antenna; Increase the separation between the equipment and the receiver; Connect the
equipment to an outlet on a different circuit than that to which the receiver is connected; or consult the
dealer or an experienced radio/TV technician for help.
May 2011 50PV450 Plasma
6

Safety & Handling Regulations
Safety and Handling, Checking PointsSafety and Handling, Checking Points
1. Approximately 10 minute pre-run time is required before any adjustments are performed.
2. Refer to the silk screening on the Switch Mode Power Supply for proper Voltage and Current listings and manufacturer’s
cautions.
3
Refer to the Voltage Sticker on the Panel when making adjustments on the Power Supply Y
-
SUS and Z
-
SUS Boards
3
.
Refer
to
the
Voltage
Sticker
on
the
Panel
when
making
adjustments
on
the
Power
Supply
,
Y
SUS
and
Z
SUS
Boards
.
4. Always adjust to the specified voltage level (+/- ½ volt) unless otherwise specified.
5. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, check that the Power Supply
and Drive Circuits are completely discharged because of residual current stored before Circuit Board removal.
5C
-
MOS circuits are used extensively for processing the Drive Signals and should be protected from static electricity
5
.
C
-
MOS
circuits
are
used
extensively
for
processing
the
Drive
Signals
and
should
be
protected
from
static
electricity
.
6. The PDP Module must be carried by two people. Always carry vertical NOT horizontal.
7. The Plasma television should be transported vertically NOT horizontally.
8. Exercise care when making voltage and waveform checks to prevent costly short circuits from damaging the unit.
9. Be cautious of lost screws and other metal objects to prevent a possible short in the circuitry.
10. New Plasma Models have thinner Display Panels and Frames than previous models. Be careful when lifting
Plasma Display’s because flexing the panel may damage the frame mounts or panel.
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.
Checking Points to be Considered
May 2011 50PV450 Plasma
7
3. Check details of defective condition and history. Example: Y-SUS or Y-Drive Board Failure, Mal-discharge on screen, etc.

Basic Troubleshooting StepsBasic Troubleshooting Steps
Define, Localize, Isolate and Correct
•Define Look at the symptom carefully and determine what circuits could be causing
the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and
check for possible overheated components. Capacitors will sometimes leak dielectric material
and give off a distinct odor. Listen for frequency changes which may occur with a Power
Supply load failure, listen for the “click” of a relay closing, remember to observe the Front
Power Indicator LED, if lit, it is a quick indication of Standby Voltage.
•Localize After carefully checking the symptom and determining the circuits to be
checked and after giving a thorough examination using your senses the first check should
always be the DC Supply Voltages to those circuits under test. Always confirm the supplies
are not only the proper level but be sure they are noise free. If the supplies are missing check
the resistance for possible short circuits.
•Isolate To further isolate the failure, check for the proper waveforms with the
Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing
and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes
“glitches” or “road bumps” will be an indication of an imminent failure.
•Correct The final step is to correct the problem. Be careful of ESD and make sure to
check the DC Supplies for proper levels. Make all necessary adjustments and lastly always
May 2011 50PV450 Plasma
8
perform a Safety AC Leakage Test before returning the product back to the Customer.

AC Leakage Test ProcedureAC Leakage Test Procedure
Leakage Current Cold Check (Antenna Cold Check)
With the instrument AC
p
lu
g
removed from an AC source
,
connect an electrical
j
um
p
er across the two AC
pg , j p
plug prongs. Connect one lead of an ohm-meter to the AC plug prongs tied together and touch the other
lead one at a time to any exposed metallic part on the set. Such as the antenna terminal, LAN jack, AV
connections, HDMI input shield, PC input shield, etc.
If the exposed metallic part has a return path to the chassis,
the measurement resistance should be between 1M
Ω
and 5 2M
Ω
the
measurement
resistance
should
be
between
1M
Ω
and
5
.
2M
Ω
.
When the exposed metal has no return path to the chassis, the reading must be infinite.
If an abnormality exists it must be corrected before the receiver is returned to the customer.
Leakage Current Hot Check (See figure)
Plug the AC cord directly into the AC outlet.
Do not use a line isolation transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF
capacitor between a known good earth ground
Check to be sure the
AC Outlet is wired correctly
capacitor
between
a
known
good
earth
ground
(Water Pipe, Conduit, etc.) and the exposed metallic
parts.
Measure the AC voltage across the resistor using AC
voltmeter with 1000 ohms/volt or more sensitivity.
A
lt d t t d 0 75 lt RMS
AC
Outlet
is
wired
correctly
and use the
Receptacle Ground
A
ny vo
lt
age measure
d
mus
t
no
t
excee
d
0
.
75
vo
lt
RMS
which corresponds to 0.5mA.
In case any measurement is out of the limits specified,
there is possibility of shock hazard and the set must be
checked and re
p
aired before it is returned to the
May 2011 50PV450 Plasma
9
p
customer.

50PV45050PV450 PRODUCT INFORMATION SECTIONPRODUCT INFORMATION SECTION
This section of the manual will discuss the specifications of the
50PV450
Ad d Si l S Pl Di l T l i i
May 2011 50PV450 Plasma
10
50PV450
Ad
vance
d
Si
ng
l
e
S
can
Pl
asma
Di
sp
l
ay
T
e
l
ev
i
s
i
on.

50PV45050PV450 SpecificationsSpecifications
1080P PLASMA HDTV F
o
r F
u
ll
Spec
ifi
cat
i
o
n
s
50" Class (49.9" diagonal)
o u Spec cat o s
See the Specification Sheet
TSli F
•
T
ru
Sli
m
F
rame
•600Hz Max Sub Field Driving
•
Full HD 1080p Resolution
•
Full
HD
1080p
Resolution
•ENERGY STAR® Qualified
•
Picture Wizard II
Picture
Wizard
II
•Intelligent Sensor
•Smart Ener
gy
Savin
g
gy g
•ISFccc® Ready
May 2011 50PV450 Plasma
11

50PV45050PV450 LogoLogo FamiliarizationFamiliarization
FULL HD RESOLUTION 1080P HD Resolution Pixels: 1920 (H) × 1080 (V)
Enjoy twice the picture quality of standard HDTV with almost double the pixel
resolution. See sharper details like never before. Just imagine a Blu-ray disc
or video game seen on your new LG Full HD 1080p TV.
Clear Voice Clearer dialogue sound
Automatically enhances and amplifies the sound of the human voice
frequency range to provide high-quality dialogue when background
noise swells.
Save Energy, Save Money
It reduces the plasma display’s power consumption.
The default factory setting complies with the Energy Star requirements
and is adjusted to the comfortable level to be viewed at home.
(Turns on Intelligent Sensor)
Save Energy, Save Money
Home electronic products use energy when they're off to power features like clock
(Turns
on
Intelligent
Sensor)
.
displays and remote controls. Those that have earned the ENERGY STAR use as much
as 60% less energy to perform these functions, while providing the same performance at
the same price as less-efficient models. Less energy means you pay less on your energy
bill. Draws less than 1 Watt in stand by.
May 2011 50PV450 Plasma
12

(600 Hz Sub Field Driving)
600Hz Sub Field Driving600Hz Sub Field Driving
•600 Hz Sub Field Driving is achieved by using 10 sub-fields per frame process
(vs. Comp. 8 sub-field/frame)
•No smeared images during fast motion scenes
Original Image 10 Sub Fields Per Frame
May 2011 50PV450 Plasma
13
Sub Field firing occurs using wall charge and polarity differences between Y-SUS and Z-SUS signals.

50PV45050PV450 Remote ControlRemote Control
TOP PORTION
BOTTOM PORTION
p/n AKB72914053
May 2011 50PV450 Plasma
14

50PV45050PV450 Rear and Side Input JacksRear and Side Input Jacks
USB port for Software Upgrades,
Music, Videos and Photos
AC In
SIDE
INPUTS
USB
HDMI 3
Composite
Video/Audio
REAR
INPUTS
May 2011 50PV450 Plasma
15
INPUTS

1) Download the Software File.
Generic Plasma USB Automatic Software Download InstructionsGeneric Plasma USB Automatic Software Download Instructions
Currently Installed Version
Software Version found on
the USB Flash Drive
File found on the USB
Flash Drive
2) Copy new software (xxx.bin) into the root of the
Jump Drive. Make sure you have the correct
software file.
3
)
With TV turned on
,
insert USB flash drive.
Highlight Start Press Select
),
4) You can see the message
“TV Software Upgrade” (See figure on right)
5) Cursor left and highlight "START" Button and
push “Enter” button using the remote control.
6) You can see the download progress Bar
Highlight
Start
Press
Select
6)
You
can
see
the
download
progress
Bar
.
7) Do not unplug until unit has automatically
restarted.
8) When download is completed, you will see
“COMPLETE”.
* CAUTION:
Do not remove AC power or the USB Flash Drive.
Do not turn off Power, during the upgrade
process.
May 2011 50PV450 Plasma
16
9) Your TV will be restarted automatically. Software Files are now available from
LGTechassist.com

Manual Software Download:Manual Software Download:
Prepare the Jump Drive as described in the “USB Automatic Download” section and insert it into the USB port.
Bring up the Customer’s Menu and scroll to “OPTIONS”, (Nothing should be highlighted on the right side).
Press the
“
FAV
”
key 7
times to bring up the first screen for Manual Download Screen (Expert Mode)
Press
the
FAV
key
7
times
to
bring
up
the
first
screen
for
Manual
Download
Screen
(Expert
Mode)
.
Press the “FAV”
key 7 times
Location of
files found
On the Jump
Highlight the Software update file the
Scroll down and highlight “Options”
Drive
highlight “Start” and press “SELECT” to
begin the download process.
WARNING:
Use extreme Caution when using the Manual “Forced” Download Menu. Any file can be
May 2011 50PV450 Plasma
17
downloaded when selected and may cause the Main board to become inoperative if the
incorrect file was selected.

Accessing the Host DiagnosticAccessing the Host Diagnostic ScreenScreen
1
)
Place Television on the di
g
ital channel that
Use the Host Diagnostic screen to investigate the signal quality of a problem channel.
2) Bring up the Customer’s Menu. Highlight
“CHANNEL”. Press “ENTER” on the remote.
4) Press the (1) Key 5 to 8 times.
The Host Diagnostics screen appears.
)
g
may be showing problems.
3) The “CHANNEL” Menu appears.
DTV SNR: Digital Television Signal to Noise Ratio
Over the Air: 8VSB (Above 20 is good)
Over
the
Air:
8VSB
(Above
20
is
good)
Cable Digital: QAM 64 (Above 24 is good)
Cable Digital: QAM 256 (Above 30 is good)
May 2011 50PV450 Plasma
18

Accessing the Service MenuAccessing the Service Menu
To access the Service Menu.
1
)
You must have either Service Remote.
)
p/n 105-201M or p/n MKJ39170828
2) Press “In-Start”
3) A Password screen appears.
4
)
Enter the Password.
)
Note: A Password is required to enter the
Se
rvi
ce
M
e
n
u
. En
te
r
;
0000
Se ce e u te ;
0000
Note: If 0000 does not work use 0413.
May 2011 50PV450 Plasma
MKJ39170828
105-201M

50PV450 Service Menu First Page
50PV450 Service Menu First Page
20 May 2011 50PV450 Plasma
Bring up the Service Menu using the Service Remote
And pressing “In-Start” enter password 0413.
MODEL
S/W VER
UTT
ADC CAL.
EDID : RGB(OK) HDMI(1:0K 2:0K 3:OK)
: 50PV45*-U*
V3.04.0 Sensor V0.05(0x05)
: 2
RGB : OK
YPbPr(SD) : OK
YPbPr(HD) : OK
0. TOOL OPTION
1. AREA OPTION
2. EPA
3. POWER OFF HISTORY
4. AUTO TEST
5. BAUD RATE
6. AUDIO EQ
7. Bass EQ
8. CHANNEL MUTE
9. SYNC LEVEL
10. DTV SNR
11. POWER ERROR HISTORY
:6
:USA
:ON
9600
ON
ON
ON
Country Group
Software Version
Unit’s Total Time
To Reset press “In Stop” Intelligent Sensor
Software Version