LG 28LB45 series User manual

Printed in KoreaP/NO : MFL68121902 (1402-REV00)
CHASSIS : LA40A / LD41A
MODEL : 28LB45** 28LB45**-Z*
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
LED TV
SERVICE MANUAL
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only

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Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SERVICING PRECAUTIONS ................................................................... 4
SPECIFICATION ...................................................................................... 6
ADJUSTMENT INSTRUCTION ............................................................. 10
TROUBLE SHOOTING .......................................................................... 15
BLOCK DIAGRAM ................................................................................. 18
EXPLODED VIEW .................................................................................. 19
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

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Only for training and service purposes
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩ and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF 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.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
SAFETY PRECAUTIONS

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SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conict between the
following servicing precautions and any of the safety precautions
on page 3 of this publication, always follow the safety precau-
tions. Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug
or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explo-
sion hazard.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specied otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10 % (by volume) Acetone and 90 %
(by volume) isopropyl alcohol (90 % - 99 % strength)
CAUTION: This is a ammable mixture.
Unless specied otherwise in this service manual, lubrication
of contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks
are correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test xtures specied in this
service manual.
CAUTION: Do not connect the test xture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged eas-
ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some eld-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam-
age caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground. Alter-
natively, obtain and wear a commercially available discharg-
ing wrist strap device, which should be removed to prevent
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 expo-
sure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static type solder removal device. Some sol-
der removal devices not classied as “anti-static” can generate
electrical charges sufcient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufcient 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 elec-
trically 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 mate-
rial 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 replace-
ment ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted oor can generate static electricity suf-
cient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropri-
ate tip size and shape that will maintain tip temperature within
the range or 500 °F to 600 °F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 °F to 600 °F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder ows onto and around both the compo-
nent lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.

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Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent at against the cir-
cuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing
the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close
as possible to the component body.
2. Bend into a "U" shape the end of each of three leads remain-
ing on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as pos-
sible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and
if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed when-
ever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC connec-
tions).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly con-
nected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the
lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This specification is applied to the LED TV used LA40A /
LD41A chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : CE, IEC
- EMC : CE, IEC
4. Model General Specification
No. Item Specication Remarks
1 Market EU/CIS(PAL/DVB Market)
DTV & Analog (Total 37 countries)
DTV (MPEG2/4, DVB-T) :37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Netherlands/
Belgium/Luxemburg/ Greece/Denmark/Czech/Austria/Hun-
gary /Swiss/Croatia/Turkey/Norway/Slovenia/Poland/Ukraine/
Portugal/Ireland/Morocco/Latvia/Estonia/Lithania/Rumania/
Bulgaria/Russia/SlovakiaBosnia/Serbia/Albania/Kazakhstan/
Belarus
*4 Country, Nordic option(EU model only)
- Denmark , Finland, Norway, Sweden
DTV (MPEG2/4, DVB-T2): 8 countries
UK/Denmark/Sweden/Finland/Norway/Ireland/Ukraine/Kaza-
khstan
DTV (MPEG2/4, DVB-C): 37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Netherlands/
Belgium/Luxemburg/ Greece/Denmark/Czech/Austria /Hun-
gary/Swiss/Croatia/Turkey/Norway/Slovenia/Poland/Ukraine/
Portugal/Ireland/Morocco/Latvia/Estonia/Lithania/Rumania/
Bulgaria/Russia/Slovakia/Bosnia/Serbia/Albania/Kazakhstan/
Belarus
DTV (MPEG2/4,DVB-S): 29 countries
Italy/Germany/France/Spain/Netherlands/ Belgium/Luxem-
burg/Greece/ Czech/Austria /Hungary/Swiss/Croatia/Turkey/
Slovenia/Poland/Portugal/ Morocco/Latvia/Estonia/Lithuania/
Rumania/Bulgaria/Russia/SlovakiaBosnia/Serbia/Albania/
Belarus
Supported satellite : 22 satellites
HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102,
ATLANTIC BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4, EUTEL-
SAT-W3A, EUROBIRD 9A, EUTELSAT-W2A, HOTBIRD 6/8/9,
EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA 3A/3B, BADR
4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-W7, HELLASSAT
2, EXPRESS AM1, TURKSAT 2A/3A, INTERSAT10

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No. Item Specication Remarks
2 Broadcasting system
Analogue TV
1) PAL-BG
2) PAL-DK
3) PAL-I/I’
4) SECAM-BG
5) SECAM-DK
6) SECAM L/L’
Digital TV
1) DVB-T/C/T2
Satellite Digital TV
1) DVB-T2/C/S/S2
Analogue TV :
(RF) VHF: E2 to E12, UHF : E21 to E69
(CATV) S1 to S20, HYPER: S21 to S47
Digital TV : VHF, UHF
Satellite TV : VHF, UHF,
C-Band, Ku-Band
* DVB-T2 ( T2 model only support )
* DVB-S/S2 (Satellite model only support )
3 Receiving system Analog : Upper Heterodyne
Digital : COFDM, QAM
► DVB-T
- Guard Interval(Bitrate_Mbit/s)B : 1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
► DVB-T2
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
► DVB-C
- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s
- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM
► DVB-S/S2
- symbolrate
DVB-S2 (8PSK / QPSK) : 2 ~ 45 Msymbol/s
DVB-S (QPSK) : 2 ~ 45 Msymbol/s
- viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
4 Interface RF / Composite / Component(CVBS) /
HDMI / USB / Headphone Out / Scart
5 DVB
DVB-T
CI : UK, Finland, Denmark, Norway, Sweden, Russia,
Spain, Ireland, Luxemburg, Belgium, Netherland
CI+ : France(Canal+), Italy(DGTVi)
DVB-C
CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria
CI+ : Switzerland(UPC,Cablecom), Netherland(Ziggo),
Germany(KDG,CWB), Finland(labwise)
DVB-S CI+ : Germany(Austria HD+)

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5. External Input Support Format
5.1. RGB/HDMI (PC)
No. Specication Remark
Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz)
1. 720*400 31.468 70.080 28.321
2. 640*480 31.469 59.940 25.175
3. 640*480 37.500 75.000 31.500
4. 800*600 37.879 60.317 40.000
5. 800*600 46.875 75.000 49.500
6. 1024*768 48.363 60.004 65.000
7. 1024*768 60.023 75.029 78.750
8. 1280*800 49.702 59.810 83.500
9. 1366*768 47.717 59.79 85.5
5.2. HDMI (DTV)
No. Specication Remark
Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz)
1. 720*480 31.469
31.5000
59.940
60.000
27.000
27.030 SDTV 480P
2. 720*576 31.250 50.000 27.864 SDTV 576P
3. 1280*720 37.500 50.000 74.250 HDTV 720P
4. 1280*720 44.960
45.000
59.940
60.000
74.170
74.250 HDTV 720P
5. 1920*1080 33.720
33.750
59.940
60.000
74.170
74.250 HDTV 1080I
6. 1920*1080 28.125 50.000 74.250 HDTV 1080I
7. 1920*1080 27.000 24.000 74.250 HDTV 1080P
8. 1920*1080 33.750 30.000 74.250 HDTV 1080P
9. 1920*1080 56.250 50.000 148.500 HDTV 1080P
10. 1920*1080 67.430
67.500
59.940
60.000
148.350
148.500 HDTV 1080P

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5.3. Component
No. Specication
Resolution H-freq(kHz) V-freq.(Hz)
1. 720x480 15.73 59.94
2. 720x480 15.73 60
3. 720x480 31.47 59.94
4. 720x480 31.5 60
5. 1280x720 44.96 59.94
6. 1280x720 45 60
7. 1920x1080 33.72 59.94
8. 1920x1080 33.75 60
9. 1920x1080 26.97 23.976
10. 1920x1080 27 24
11. 1920x1080 33.71 29.97
12. 1920x1080 33.75 30
13. 1920x1080 67.432 59.94
14. 1920x1080 67.5 60

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ADJUSTMENT INSTRUCTION
1. Application Range
This document is applied to LA40A / LD41A chassis LED TV
which is manufactured in TV(or Monitor) Factory or is
produced on the basis of this data.
2. Designation
1) The adjustment is according to the order which is
designated and which must be followed, according to the
plan which can be changed only on agreeing.
2) Power adjustment : Free Voltage.
3) Magnetic Field Condition: Nil.
4) Input signal Unit: Product Specification Standard.
5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25 °C ± 5 °C
Relative humidity : 65 % ± 10 %
Input voltage : 110-240 V, 50/60 Hz
6) Adjustment equipments: Color Analyzer(CA-210 or CA-110),
DDC Adjustment Jig equipment, Service remote control.
7) Push the "IN STOP KEY" - For memory initialization.
3. Main PCB check process
* APC - After Manual-Insult, executing APC
3.1. Boot le Download
(1) Execute ISP program “Mstar ISP Utility” and then click
“Config” tab.
(2) Set as below, and then click “Auto Detect” and check “OK”
message. If display “Error”, Check connect computer, jig,
and set.
(3) Click “Connect” tab. If display “Can’t”, Check connect
computer, jig, and set.
4) Click “Read” tab, and then load download file(XXXX.bin) by
clicking “Read”.
5) Click “Auto” tab and set as below
6) Click “Run”.
7) After downloading, check “OK” message.
3.2. USB DOWNLOAD(*.epk file download)
(1) Make New folder named “LG_DTV” and put ISP file(*.epk)
in the folder.
(2) Put the USB Stick to the USB socket.
(3) Automatically detecting update file in USB Stick
- If your downloaded program version in USB Stick is Low,
it didn’t work.
- But your downloaded version is High, USB data is
automatically detecting
(4) Show the message "Copying files from memory"
(5) Updating is starting.
(6) Updating Completed, The Multi-vision will restart
automatically.
(7) If your TV is turned on, check your updated version and
Tool option.(refer to next page tool option section)
* If downloading version is more high than your TV have,
TV can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn’t
have a DTV/ATV test on production line.
* After downloading, have to adjust TOOL OPTION again.
Case1 : Software version up
1. After downloading S/W by USB , TV set will reboot
automatically.
2. Push “In-stop” key.
3. Push “Power on” key.
4. Function inspection
5. After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push
“In-stop” key at rst.
2. Push “Power on” key for turning it on.
→ If you push “Power on” key, TV set will recover
channel information by itself.
3. After function inspection, Push “In-stop” key.
(1) (3)
(
2
)
OK
Please Check the Speed :
Use the speed under
200KHz.
(4)
filexxx.bin
(
6
)
(5)
(7) ……….OK
(
5
)

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Only for training and service purposes
3.3. Tool option Selection
(1) Push "ADJ" key in service remote control.
(2) Select "Tool Option 1" and Push “OK” button
(3) Punch in the number. (Each model has their number.)
(4) Completed selecting Tool option.
3.4. EDID Process
3.4.1. EDID download
(1) Press "Power only" key of service remote control.
(2) Press the "ADJ" key of service remote control.
(3) Enter EDID D/L mode by pushing "►" key at "12. EDID D/L".
(4) Select “Start” menu to download EDID data.
(5) Check the "OK" message.
(6) Press EXIT key on service remote control.
<Caution>
- Do not connect HDMI & D-sub Cable when download EDID.
* Edid data and Model option download (RS232)
<Caution>
* Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
3.4.2. HDMI1 EDID Data - Checksum : 98 CE
3.5. Function Check
3.5.1. Check display and sound
*Check Input and Signal items. (cf. work instructions)
1) TV
2) AV (SCART/CVBS)
3) COMPONENT (480i)
4) HDMI(PC : 1366 x 768 @ 60Hz)
* Display and Sound check is executed by Remote control
<Caution> Not to push the INSTOP key after completion if the
function inspection.
3.6. CI+ key writing process(Device CN)
3.6.1. Communication Port Connection
Connection : PCBA(USB Port) → USB to Serial Adapter(UC-
232A) → RS-232C cable → PC(RS-232C port)
3.6.2. CI+ Key Download
(1) Set CI+ Key path Directory at Start Mac & CI+ Download
Programme.
(2) Set COM 1,2,3,4 / 115200(Baudrate)
(3) Click port connection button.
(4) Start CI+ Key Download, Push the button.
(5) Check OK or NG
(6) After completing download, CI + key values are increase
by one automatically. To write CI+ key next SET, click CI+
key writing button directly.
(7) Check whether the key was downloaded or not at ‘In Start’
menu. (Refer to below).
EZ ADJUST
0. Tool Option1 ►
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option6
6. Country Group
7. Area Option
Tool Option1
Tool Option1
Inch
Tool
Maker
16423
MX33
LGD_IPS
26
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option6
6. Country Group
7. Area Option
8. ADC Calibration
9. White Balance
10. 10 Point WB
11. Test Pattern
12. EDID D/L ►
13. Sub B/C
14. Touch Sensitivity Setting
15. Ext. Input Adjust
16. SPK Lipsync Adjust
17.SPDIF Lipsync Adjust
EDID D/L
HDMI OK
RGB OK
Start Reset
No. Item CMD 1 CMD 2 Data 0
Enter download
MODE
Download
‘Mode In’
A A 0 0 When transfer the ‘Mode
In’, Carry the command.
EDID data and
Model option
download
Download A E 00 10 Automatically download
(The use of a internal Data)

- 12 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3.6.3. Check the Download to CI+ Key value in LG set.
(1) Check the method of CI+ Key value.
1) Check the method on Instart menu.
(2) Check the method of CI+ key value(RS232)
1) Into the main ass’y mode(RS232: aa 00 00)
2) Check the mothed of CI+ key by command
(RS232: ci 00 20)
3) Result value
i 01 OK 1d1852d21c1ed5dcx
4. Total Assembly line process
4.1. Tool option & ADC Check
(1) Press "Power on" key of service remote control.
(2) Connect RS232 Signal Cable to RS-232 Jack.
(3) Check the 'Tool Option'(Refer to the BOM Comments or
Adjustment spec.)
(4) Check the ‘ADC’ is ok.
4.2. Model name & Serial number download
4.2.1. Model name & Serial number D/L
1) Press "Power on" key of service remote control.
2) Connect RS232 Signal Cable to RS-232 Jack.
3) Write Model Name & Serial Number by use RS-232.
4) Must check the serial number at the Diagnostics of SET UP
menu. (Refer to below.)
4.2.2. Method & notice
(1) Model Name & Serial Number D/L is using of scan
equipment.
(2) Setting of scan equipment operated by Manufacturing
Technology Group.
(3) Serial number D/L must be conformed when it is produced
in production line, because serial number D/L is mandatory
by D-book 4.0.
*Manual Download (Model Name and Serial Number)
If the TV set is downloaded By OTA or Service man,
Sometimes model name or serial number is initialized. (Not
always) There is impossible to download by bar code scan,
so It need Manual download.
1) Press the 'Instart' key of ADJ remote control.
2) Go to the menu '6.Model Number D/L' like below photo.
3) Input the Factory model name(ex 24LB4500) or Serial
number like photo.
4) Check the model name Instart menu. → Factory name
displayed.
5) Check the Diagnostics. (DTV country only) → Buyer
model displayed.
CMD 1 CMD 2 Data 0
A A 0 0
CMD 1 CMD 2 Data 0
C I 2 0
CI+ Key Value

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.3. Function Check
4.3.1. Check display and sound
■ Check Input and Signal items. (cf. work instructions)
1) TV
2) AV (SCART/CVBS)
3) COMPONENT (480i)
4) HDMI(PC : 1366 x 768 @ 60Hz)
* Display and Sound check is executed by Remote control
* Caution : Not to push the INSTOP KEY after completion if
the function inspection.
4.3.2. PCMCIA CARD Check
You must adjust DTV 29 Channel and insert PCMCIA CARD
to socket.
- If PCMCIA CARD works normally, video signals will appear
on screen. But it works abnormally, "No CA module" will
appear on screen.
* Caution: Set up "RF mode" before launching products.
4.4. White balance adjustment
(Do not adjust white balance)
(1) Equipment
1) Color Analyzer: CA-210 (LED Module : CH 14)
2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
3) Adjust Remote control
RGB Gains are fixed data for each model.
Insert RS-232C Jack which is connected with PC for White
Balance or equivalent device.
→ Total Assembly line should be check whether the color
coordinate(x,y) data refer to below table were meet or not.
Color coordinate is differ from panel’s characteristics of
color temperature. Please check panel characteristics about
color temperature
- Cool Panel
* Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature.
* Note : Manual W/B process using adjusts Remote control.
1) After enter Service Mode by pushing "ADJ" key,
2) Enter "White Balance" by pushing "►" key at "9. White
Balance".
* When doing Adjustment, Please make circumstance as
below.
4.5. DPM Operation check
■ Measurement Condition: 100~240V@ 50/60Hz
(1) Set Input to HDMI (with Input Label set to PC) and connect
HDMI cable to set - HDMI Mode
(2) Cut off H sync or V sync of signal.
(3) Check DPM operation refer to the below table.
Color
Temperature
Cool 13,000 K X=0.276 (±0.04)
Y=0.275 (±0.04) <Test Signal>
Inner pattern
(204gray,80IRE)
Medium 9,300 K X=0.290 (±0.04)
Y=0.298 (±0.04)
Warm 6,500 K X=0.318 (±0.04)
Y=0.334 (±0.04)
Luminance
(cd/m²)
Cool Min : 80 K Typ : 110 <Test Signal>
Inner pattern
(204gray,80IRE)
Medium Min : 80 K Typ : 110
Warm Min : 70 K Typ : 110
EZ ADJUST
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Tool Option6
6. Country Group
7. Area Option
8. ADC Calibration
9. White Balance
10. 10 Point WB
11. Test Pattern
12 EDID D/L
13. Sub B/C
14. Touch Sensitivity Setting
15. Ext. Input Adjust
16. SPK Lipsync Adjust
17.SPDIF Lipsync Adjust
Whit Balance
Color Temp. ◄ ►
R-Gain
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset To Set
Cool
100
104
192
64
64
64
ON
100
Operating Condition Sync(H/V) Video LED(SET) Wattage(W)
Power S/W On Sleep mode -
RGB, HDMI Off/Off Off Amber 1

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.6. Model name & SW version & Adjust check
* Press the ‘Instart’ key of ADJ remote control.
4.6.1. Model Name& SW Version Check
1) Check ‘Model Name’.
2) Check ‘S/W Version’ (Refer to the IC Ver. in the BOM)
4.6.2. Adjust Check
1) Check ‘Country Group’
2) Check ‘Area Option’
3) Check ‘Tool Option’ (Refer to the BOM Comments)
4) Check ‘EDID[RGB&HDMI]’ is OK.
* After check all, Press the 'EXIT' key of ADJ remote control to
go out SVC menu.
4.7. Outgoing condition Configuration
* After all function test., press IN-STOP key by SVC Remote
control. And make Outgoing Condition.

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. No Power
Check C400
Voltage Level. (19V)
Check IC401 Output
Voltage Level. (3.3V)
Check X100 Clock
24MHz.
Check IC402 Output
Voltage Level. (1.15V)
Check IC403 Output
Voltage Level. (5V)
Replace IC102 Flash Memory.
Check Power connector
OK?
Replace IC401 & Recheck.
Replace X100.
Replace IC402 & Recheck.
Replace IC403 & Recheck.
Replace Adapter.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2. No Screen on
3. No Video - Digital TV
Module Back Light On?
Check FFC Cable for Damage or Open
Conductors.
Check Panel Power 12V. (P600 #30)
Check IC800 Output 12V.
Check Panel input Clock
P601.(#9, #10)
Replace T-Con Board or Module.
Check WLED_ENABLE
High?
Check LED Driver Output.
(C1024)
Check IC1001 & Q1002.
Replace LED Driver IC or FET.
Replace Cable.
Replace IC400 &Recheck.
Check IC100.
Repair Main B/D.
Check IC101.
Replace Main SOC.
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Check RF Cable.
1. Check RF IC(L2606) Power.(3.3V)
2. Check IC401 Output voltage.(3.3V)
Check SCL/SDA Line.(TU2603 #4, #5)
Replace IC401 & Recheck.
Replace TU2603 or IC101.
No
No
Yes
Yes

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. No Video - HDMI
Check input signal format
Is it supported?
Check HDMI Cable for Damage or
Open Connector.
Replace Main Scaler. (IC101)
Check JK801 for proper connection
or Damage.
Check I2C Signal
(JK801)
Replace Connector.
Re Download EDID Data.
No
No
Yes
Yes
Yes
Yes

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
MSTAR M1A
COMPONENT
RGB
HDMI1
DSUB R/G/B/H/V
Audio IN
HP L & R out
COMP_Y , Pb ,Pr
COMP_L & R_IN
USB (Jpeg,MP3,DVIX)
LGIT Half NIM (TDJH-H101F)
IF_AGC_MAIN
IF_P IF_N
DDR3 SDRAM
(1G)
NAND Flash
TU_SDA&SCL
SERIAL Flash
F_RB PF-OE PF_CEO
SPI_CK SPI_CI SPI_CS SPI_DO
DDR3 Data[0:15]
DDR3 Address[0:12]
System EEPROM
EEPROM SCL & SDA
Panel
Digital amp (TAS5733)
SP (L)
SP (R)
Audio_ Master_CLK /DATA[3] ,
12.07Mhz
HP L/R
H/P
AMP SCL&SDA
CVBS
XTAL : 24MHz
TMDS : 148.5MHz
HDMI2 & MHL
HDMI_TMDS & HDMI I2C
HDMI_TMDS & HDMI I2C
--NTSC/ATSC: TDJH-H101F(Half NIM)
*Tuner country Option
H
D
M
I
2
&
M
H
L
*DDR3 (793Mhz)
: Only PIP
MT75, MT55 Use MT45,Not use
H
/
P
*HDMI Option MT75, MT55 2EA Use MT45, MT45A 1EA use
MT55/75 : LVDS 2ch, 1920x1080,60hz , 175Mhz(Max)
MT45 : LVDS 1ch, 1366x768,60hz, 82Mhz (Max)
BLOCK DIAGRAM

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
A2 A31
900
200
400
540
120
801
300
510
301
521
800
LV1
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE

THERMAL
THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES
SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
FIRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS
ESSENTIAL THAT ONLY MANUFACTURES SPECIFIED PARTS BE USED FOR
THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC.
POWER
2013/09/13
1 12
MT45
R425
0
R423
10K
1%
HD(12V Panel)
R409
10K
HD(12V Panel)
R419
33K
R445
10K
1%
R402
47K
OPT
R436
4.7K
R422
100K
1%
HD(12V Panel)
R440
22K
R434
100K
R404
47K
OPT
R427
5.1K
1%
R429
10K
1%
R444 10K
1%
R443 1K
1%
R410
2K
OPT
R439
10K
R413
2K
OPT
R438
100
R418
33K
HD(12V Panel)
R403
47K
R412
20K
R426
10K
1%
R428
27K
1%
R424
4.7K
1%
R421
43K
1%
HD(12V Panel)
R411
100K
R437
0
HD(12V Panel)
R446
0
HD(12V Panel)
R420
33K
R405
47K
OPT
R401
10K
R417
2K
OPT
R408
68
R407
68
R406
68
HD(12V Panel)
R415
68
R416
75K
1%
R441
100K
R442
10K
FHD(5V Panel)
R400
10K
R414
10K
R433
10K
R430
39K
1%
R431
15K
1%
R432
10K
1%
R421-*1
39K
1%
(OPT)5V MHL Separate
R423-*1
10K
1%
(OPT)5V MHL Separate
R422-*1
15K
1%
(OPT)5V MHL Separate
R448
0
(OPT)5V MHL Separate
R447
0
FHD(5V Panel)
R435
0
FHD(5V Panel)
R3471
1K
FHD
R3472
0
FHD
C414
0.1uF
50V
C406
0.1uF
50V
HD(12V Panel)
C417
0.1uF
16V
HD(12V Panel)
C422
10uF
16V
HD(12V Panel)
C401
10uF
25V
OPT
C408
0.1uF
50V
C412
0.1uF
50V
HD(12V Panel)
C407
0.1uF
50V
C413
0.1uF
50V
C402
10uF
25V
OPT
C426
10uF
10V
OPT
C423
22uF
6.3V
C429
0.1uF
16V
C438
0.1uF
16V
C435
0.01uF
25V
C434
1uF
10V
OPT
C419
0.1uF
16V
C418
0.1uF
16V
C421
22uF
6.3V
C433
10uF
10V
C425
10uF
10V
OPT
C424
10uF
16V
HD(12V Panel)
C430
0.1uF
16V
C437
10uF
10V
OPT
C428
0.1uF
16V
HD(12V Panel)
C427
10uF
10V
C431
10uF
10V
C432
0.1uF
16V
C416
0.1uF
50V
C420
0.1uF
16V
C411
0.1uF
50V
C410
0.47uF
16V
OPT
C440
4.7uF
16V
C436
1uF
16V
HD(12V Panel)
C415
0.1uF
16V
C405
2.2uF
25V
C404
2.2uF
25V
HD(12V Panel)
C403
2.2uF
25V
C409
2.2uF
25V
PANEL_CTL
MULTI_ON
POWER_ON/OFF1
MULTI_ON
LED_AMBER
L401
10uH
L402
10uH
HD(12V Panel)
L403
10uH
IC401
MP2315GJ
3
SW
2
IN
4
GND
1
AAM
5BST
6EN/SYNC
7VCC
8FB
IC400
MP2315GJ
HD(12V Panel)
3
SW
2
IN
4
GND
1
AAM
5BST
6EN/SYNC
7VCC
8FB
IC402
MP2315GJ
3
SW
2
IN
4
GND
1
AAM
5BST
6EN/SYNC
7VCC
8FB
IC403
MP2315GJ
3
SW
2
IN
4
GND
1
AAM
5BST
6EN/SYNC
7VCC
8FB
+3.3V_ST
+12V_Normal
+3.3V_ST
+12V_Normal
+12V_PANEL_POWER
+1.5V_DDR
+3.3V_Normal
+3.3V_ST
+3.3V_Normal
+19V
+3.3V_Normal
+5V_Normal
+5V_PANEL_POWER
+5V_Normal
+3.3V_ST
+5V_MHL_Separate
Q402
PMV48XP
G
D
S
Q403
AO3407A
G
D
S
+1.15V_VDDC
JP401
JP400
IC404
TJ4220GDP-ADJ
3
VIN3
2
EN2
4
NC4
1
NC_1
5NC_2
6VOUT
7ADJ/SENSE
8GND
9
[EP]GND
JK400
KJA-DC-1-0032
1
2
4
C400
47uF
25V
105C
Q400
MMBT3904(NXP)
E
B
C
Q401
MMBT3904(NXP)
E
B
C
Q3451
MMBT3904(NXP)
FHD
E
B
C
D400
MMBD6100
A2
C
A1
L400
4.7uH
C439
4.7uF
10V
R442-*1
4.7K
HD(12V Panel)
NEW
PANEL POWER CONTROL
19V to 1.15V (M1 Core)
NEW
6604->6601
11.11.07
3.3V TO 1.5V LDO(DDR Power)
3A
3A
Check the Ripple
3A
NEW
19V TO 5V DCDC CONVERTER
3A
NEW
19V to 12V (For HD Panel)
For Module Power Sequence
R441 : 22k --> 100k
R442 : 1k --> 10k
13.06.28
If this system need 5V Power
and don’t need 12V Power,
Please need 5V_MHL_Separate Power
MT45 EU(T/C),LB45 EU(T/C)
Copyright © 2014 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only