LG BD550 User manual

BLU-RAY DISC PLAYER
SERVICE MANUAL
MODEL: BD550
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: BD550SERVICE MANUAL
P/NO : AFN73271533JANUARY, 2010
Website http://biz.lgservice.com
Internal Use Only

CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ BCM7630 F/E LOADER PART
SECTION 5 ........ REPLACEMENT PARTS LIST
1-1
2010

SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR
BLU-RAY DISC PLAYER PRODUCTS ................................................................................................ 1-3
SERVICING PRECAUTIONS................................................................................................................... 1-4
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE (ES) DEVICES
SOFTWARE UPGRADE............................................................................................................................ 1-5
NETWORK UPDATE .................................................................................................................................. 1-6
SPECIFICATIONS ....................................................................................................................................... 1-9
1-2
2010

IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from LG Corporation. All components should
be replaced only with types identical to those in the original circuit and their physical
location, wiring and lead dress must conform to original layout upon completion of
repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component desig-
nators and are required to maintain safe performance. No deviations are allowed
without prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into the
set is not delayed until the new service literature is printed.
CAUTION : Do not attempt to modify this product in any way. Never perform cus-
tomized installations without manufacturer’s approval. Unauthorized modifications
will not only void the warranty, but may lead to property damage or user injury.
Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended to alert
the service personnel to important safety information in the service
literature.
The lightning flash with arrowhead symbol within an equilateral trian-
gle is intended to alert the service personnel to the presence of non-
insulated “dangerous voltage” that may be of sufficient magnitude to
constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equilat-
eral triangle is intended to convey to the service personnel the follow-
ing fuse replacement caution notice:
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK OF
FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and from
the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers, shields, strain
reliefs, power supply cords, and other hardware have been reinstalled per the
original design. Be sure that the safety purpose of the polarized line plug has not
been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign particles.
4. Check for physical evidence of damage or deterioration to parts and components,
for frayed leads or damaged insulation (including the AC cord), and replace if
necessary.
5. No lead or component should touch a high current device or a resistor rated at 1
watt or more. Lead tension around protruding metal surfaces must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of electri-
cal shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the
following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a .15 mfd
150V AC type capacitor between a known good earth ground water pipe, conduit,
etc.) and the exposed metallic parts, one at a time. Measure the AC voltage
across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the
AC plug by using a non-polarized adaptor and repeat AC voltage measurements
for each exposed metallic part. Voltage measured must not exceed 0.75 volts
RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected immediately.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations where dew
is a factor, near steam radiators where steam leakage is a factor, etc.
3. Avoid placement where draperies may obstruct venting. The customer should
also avoid the use of decorative scarves or other coverings that might obstruct
ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit must follow
the factory-approved mounting instructions. A product mounted to a shelf or
platform must retain its original feet (or the equivalent thickness in spacers) to
provide adequate air flow across the bottom. Bolts or screws used for fasteners
must not touch any parts or wiring. Perform leakage tests on customized installa-
tions.
5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small casters
across thresholds or deep pile carpets.
7. Caution customers against using extension cords. Explain that a forest of exten-
sions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.
1-3
2010
PRODUCT SAFETY SERVICING GUIDELINES
FOR BLU-RAY DISC PLAYER PRODUCTS

CAUTION: Before servicing the BLU-RAY DISC PLAYER
covered by this service data and its supplements and
addends, read and follow the SAFETY PRECAUTIONS.
NOTE: if unforeseen circumstances create conflict between
the following servicing precautions and any of the safety pre-
cautions in this publications, always follow the safety precau-
tions.
Remember Safety First :
General Servicing Precautions
1.Always unplug the BLU-RAY DISC PLAYER AC power cord
from the AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnecting or reconnecting any internal electrical
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an electro-
lytic capacitor.
Caution : A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2.Do not spray chemicals on or near this BLU-RAY DISC
PLAYER or any of its assemblies.
3.Unless specified otherwise in this service data, clean elec-
trical contacts by applying an appropriate contact cleaning
solution to the contacts with a pipe cleaner, cotton-tipped
swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication
of contacts is not required.
4.Do not defeat any plug/socket B+ voltage interlocks with
whitch instruments covered by this service manual might be
equipped.
5.Do not apply AC power to this BLU-RAY DISC PLAYER
and / or any of its electrical assemblies unless all solidstate
device heat sinks are correctly installed.
6.Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.
Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V)
to the blades of the attachment plug. The insulation resistance
between each blade of the attachment plug and accessible
conductive parts (Note 1) should be more than 1Mohm.
Note 1 : Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field effect
transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.
1.Immediately before handling any semiconductor compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commercially
available discharging wrist strap device, which should be
removed for potential shock reasons prior to applying power
to the unit under test.
2.After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3.Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4.Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.
5.Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.
6.Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil,or comparable conductive material).
7.Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
Caution: Be sure no power is applied to the chassis or cir-
cuit, and observe all other safety precautions.
8.Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec-
tricity sufficient to damage an ES device.)
1-4
2010
SERVICING PRECAUTIONS

• Burn a DVD recordable disc or USB with a file that is named to “LG_BD_5000B30.ROM”.
• Insert a upgrading disc or USB.
• Show help message for disc upgrade as follows.
< in the case of Back End program & Front End program >
Press play key to upgrade and it will show progress information
After completing upgrade then power is off.
1-5
SOFTWARE UPGRADE

1-6
2010
1) Press Home on the Remote Control.
2) Press or to select the Setup mode.
3) Select Others --> Software Update
4) On the UPDATE window, press or ENTER to
check for the newest update.
(Checking will takes about one minute.)
Caution:
Pressing Enter while checking for the update will end
process
NETWORK UPDATE
You can update the firmware by connecting your unit device directly to the S/W update server.
Configuring Network Settings
To update the firmware by connecting your player directly to the S/W update server, your player must be
connected to network. If your player is not connected to network, make a physical connection.

1-7
2010
If newer version exists,
5) If newer version exists, the message
“A new update was found. Do you want to
download it?” appears.
Select OK to download the update.
(Selecting CANCEL will end the update.)
6) The player starts downloading the newest update
from the SBP server.
7) When downloading is completed, the message,
“Download is complete. Do you want to
update?” appears.
8) Select OK to start updating

1-8
2010
9) Update will be processed
Caution :
Do not turn off the power during firmware update.
10) When update is completed, the message,
“Update is complete.” will appear, and the power
will turn off automatically after 5 seconds.
11) Turn the power back on.
The system now operates with the new version.

• GENERAL
Power requirements: AC 120 V, 60 Hz
Power consumption: 20W
Dimensions (W x H x D): Approx. 430 x 45 x 200 (mm) without feet
Weight (Approx.): 3.2 kg (Net weight)
Operating temperature: 41 °F to 95 °F (5 °C to 35 °C)
Operating humidity: 5 % to 90 %
• OUTPUTS
VIDEO OUT: 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
COMPONENT VIDEO OUT: (Y) 1.0V (p-p), 75 Ω,negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
HDMI OUT (video/audio): 19pin (HDMI standard, Type A)
ANALOG AUDIO OUT: 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1
DIGITAL OUT (OPTICAL): 3 V (p-p), Optical jack x 1
DIGITAL OUT (COAXIAL): 0.5 V (p-p), 75 Ω, RCA jack x 1
MULTI CHANNEL OUT: 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack x 8
• SYSTEM
Laser: Semiconductor laser, wavelength: 405 nm / 650nm
Signal system: Standard NTSC Color TV system
Frequency response: 20 Hz to 20 kHz
Signal-to-noise ratio: More than 100 dB (ANALOG OUT connectors only)
Harmonic distortion: Less than 0.008 %
Dynamic range: More than 95d B
LAN port: Ethernet jack x 1, 10BASE-T / 100BASE-TX
Note : Design and specifications are subject to change prior notice.
1-9
2010
SPECIFICATIONS

MEMO
1-10
2010

SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... 2-3
 ................................................................................................. 2-3
................................................................................................. 2-4
 ......................................................................................................... 2-5
2-1
2010

OPTIONAL PARTS
A46
A44
A47
A50
CABLE2
A43A
B
A
D
C
B
E
A
E
468
468
250
468 251
465
465
465
284
283
275
452
261A 261B
P101
261C
261
261
261
260
320
300
462
D
275A
285
1. CABINET AND MAIN FRAME SECTION
2-2
2010
EXPLODED VIEWS

2. DECK MECHANISM SECTION (BM08A)
1439
1026
A001
1002
1005
1001
1049
1437
1437
1437
1025
1025
1030
1024
1011
1012
1431
1019
1018
14391439
10431031
1045
A005
A006
1017
1016
10131433
1015
1020
1024
1004
1003
2-3
2010

3. PACKING ACCESSORY SECTION
2-4
2010
808 Battery
812 Plug Ass'y 2way
811 Plug Ass'y 1way
803 Packing
900 Remote Control
801 Instruction Ass'y
803 Packing
802 Box
804

SECTION 3
ELECTRICAL
CONTENTS
DIGITAL DISPLAY & MEDIA TRAINING MASTER......................................................................... 3-2
........................................................................................................................... 3-2
 .......................................................................................................................................... 
................................................................................................................................. 3-12
.................................................................................................................. 3-14
................................................................................................................................ 
 ............................................................................................................................... 3-26
 ............................................................................................................................................... 
................................................................................................................................................ 3-32
 ....................................................................................................................................... 3-33
 .......................................................................................................................................... 3-39
11.  ........................................................................................................... 3-53
12.  .................................................................................................................................................... 
13.  ................................................................................................................................................. 3-63
14. ............................................................................................................................................. 3-64
15.  .................................................................................................................................. 
ONE POINT REPAIR INSTRUCTION ................................................................................................. 3-68
1.  ....................................................................................................................... 3-68
2. ....... 
3. .......................................................... 
 ........................................................................ 
.................................. 
 ....... 
  ................... 
WAVEFORMS............................................................................................................................................. 3-78
.................................................................................................................................. 
 .............................................................................................. 
 ........................................................................................ 
 ........................................................................................ 3-81
 ......................................................................................................................... 3-82
 .......................................................................................................................................... 3-83
.................................................................................................................................. 3-84
BLOCK DIAGRAMS ................................................................................................................................. 3-85
 ................................................................................................................ 3-85
..................................................................................................................... 3-86
 ................................................................................................................. 
 ..................................................................................................... 3-88
 ............................................................................................. 3-89
 ...................................................................................................... 
 ....................................................................................................... 3-91
CIRCUIT DIAGRAMS ............................................................................................................................... 3-93
.................................................................................................. 3-93
......................................................................................... 3-95
...................................................................................................... 
...................................................................................................... 3-99
.................................................................................................... 
 ................................................................................. 
 ........................................................................ 
....................................................................... 
................................................................................................ 
 ............................................................................... 3-113
11. ............................................................................ 3-115
12. ......................................................................................... 
CIRCUIT VOLTAGE CHART ............................................................................................................... 3-119
PRINTED CIRCUIT BOARD DIAGRAMS........................................................................................ 3-121
 .............................................................................................................................. 3-121
 ............................................................................................................................. 3-123
 ........................................................................................................................... 3-125
3-1
2010



1. DISTORTED PICTURE
1-1. Lines on Picture
 



NO
YES







NO
YES






NO
YES







NO
YES







NO
YES







NO 



3-2
2010
DIGITAL DISPLAY & MEDIA TRAINING MASTER



NO
YES







NO
YES





NO
YES






NO
YES







NO
YES







NO 



1-2. Ghost Picture
 
3-3
2010
DIGITAL DISPLAY & MEDIA TRAINING MASTER



NO
YES







NO
YES





NO
YES






NO
YES







NO
YES






NO 



1-3. Rolling Picture
 
3-4
2010
DIGITAL DISPLAY & MEDIA TRAINING MASTER



NO
YES







NO
YES





NO
YES






NO
YES







NO
YES







NO 



1-4. Shaky Picture
 
3-5
2010
DIGITAL DISPLAY & MEDIA TRAINING MASTER