LG 24MN42A User manual

Printed in KoreaP/NO : MFL67580632 (1208-REV00)
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
LED LCD 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
CHASSIS : LM93B
MODEL : 24MN42A 24MN42A-PMN
M2442A M2442A-PMN

- 2 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
CONTENTS
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SERVICING PRECAUTIONS ................................................................... 4
SPECIFICATION ...................................................................................... 6
ADJUSTMENT INSTRUCTION ............................................................... 8
TROUBLE SHOOTING GUIDE ............................................................... 12
BLOCK DIAGRAM ................................................................................. 23
EXPLODED VIEW .................................................................................. 24
SCHEMATIC CIRCUIT DIAGRAM ..............................................................

- 3 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
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

- 4 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
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 precautions.
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 mod-
ule 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 discharging
wrist strap device, which should be removed to prevent poten-
tial 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 solder
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 electri-
cally 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 circuit,
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 appropriate
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.

- 5 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
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 remaining
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 whenever
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.

- 6 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .
1. Application range
This spec sheet is applied to the TV used LM93B 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 specification
- EMC : CE, IEC
4. General Specification
4.1. RGB-PC
No. Item Specication Remarks
1 Supported Sync. Type Separate Sync.(RGB), SOG
2 Operating Frequency Analog Horizontal 30 ~ 69 kHz
Vertical 56 ~ 61 Hz
3 Operating Frequency Analog Max 1366×768 @ 60Hz
Recommend 1366×768 @ 60Hz
4 Input Voltage Voltage :100 – 240 Vac, 50 or 60 Hz
5 Inrush Current Cold Start : 50 A, Hot : 120 A
6
Operating Condition Sync (H/V) Video LED Wattage
Power S/W On
On mode On/On Active Off 50(Max)
On/On Active 30(Typ.)
Sleep mode Off/On Off Blanking 1W RGB
On/Off
Power S/W Off Off mode - Off Red 0.5W Just operate power key and remote
controller power button.
7 MTBF 30,000 HRS with 90 % Condence level Lamp Life : 30,000 Hours(min)
8 Using Altitude 5,000 m (for Reliability) 3,000m(for FOS)
9 Operating Environment Temp : 10 °C ~ 35 °C
Humidity : 20 % ~ 80 %
10 Storage Environment Temp : -10 °C ~ 60 °C non condensing
Humidity : 5 % ~ 90 % non condensing

- 7 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.2. TV
5. RGB Input ( PC )
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed Remark
1 640*480 31.469 59.94 25.175
2 800*600 37.879 60.317 40.0
3 1024*768 48.363 60.0 65.0
4 1280*720 47.77 59.85 74.5
5 1152*864 54.34 60.05 80
6 1280*1024 63.981 60.02 108.0
7 1366*768 47.71 59.79 85.5
6. HDMI Input (DTV)
No Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed Remarks
1 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I) Support(not spec)
2 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I) Support(not spec)
3 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 50Hz Support(not spec)
4 720*480 31.47 59.94 27.000 SDTV 480P
5 720*480 31.50 60.00 27.027 SDTV 480P
6 720*576 31.25 50.00 27.000 SDTV 576P 50Hz
7 1280*720 44.96 59.94 74.176 HDTV 720P
8 1280*720 45.00 60.00 74.250 HDTV 720P
9 1280*720 37.50 50.00 74.25 HDTV 720P 50Hz
10 1920*1080 33.72 59.94 74.176 HDTV 1080I
11 1920*1080 33.75 60.00 74.250 HDTV 1080I
12 1920*1080 28.125 50.00 74.250 HDTV 1080I 50Hz
13 1920*1080 67.432 59.94 148.350 HDTV 1080P
14 1920*1080 67.5 60 148.5 HDTV 1080P
15 1920*1080 56.250 50 148.5 HDTV 1080P 50Hz
* HDMI jack is for AV(video signal)
No. Item Specication Remarks
1. Market Central and South America
2. Broadcasting system NTSC, PAL-M/N
3. Available Channel
(Revision 21: 10.12.08)
BAND NTSC China(DK)
VHF 2~13 VHF/UHF C1~C62
UHF 14~69 VHF/UHF C1~C62
CATV 1~125 CATV S1~S41
4. Receiving system Upper Heterodyne
5. CVBS Input (1EA) NTSC, PAL-M, PAL-N 3 System(Rear) : NTSC, PAL-M,
PAL-N
6. RGB Input RGB-PC Analog(D-SUB 15Pin)
7. HDMI Input (1EA) HDMI-DTV HDMI version 1.3 ,Support HDCP
8. Audio Input (1EA) CVBS L/R Input

- 8 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This document is applied to LM93B chassis TV which is
manufactured in TV 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 : 220 V, 60 Hz
(6) Adjustment equipments: Color Analyzer (CA-210 or
CA-110), Pattern Generator (MSPG-925L or Equivalent),
DDC Adjustment Jig equipment, SVC remote control
3. ADC calibration
3.1. PC input ADC
(1) Auto RGB Gain/Offset Adjustment
■ Convert to PC in Input-source
■ Signal equipment displays
Output Voltage: 700mVp-p
Impress Resolution XGA (1024 x 768 @ 60Hz)
Model: 60 in Pattern Generator (1024X768@60Hz 16
step Gray Pattern)
Pattern: 29 in Pattern Generator (MSPG-925 Series)
■ Adjust by commanding AUTO_COLOR_ADJUST (0xF1)
0x00 0x02 instruction
(2) Confirmation
■ We confirm to address “0xF1” in page “0xBC” of
EEPROM the value is “0xAA” or not.
■ If the value is not “0xAA,” we adjust once more
■ We can write the ADC values from “0x00~0x05”
addresses in a page “0x0E”
* Manual ADC process using Service Remocon. After enter
Service Mode by pushing “ADJ” key, Execute “Auto-RGB”
by pushing “►” key at “Auto-RGB.”
4. Adjustment items
4.1. PCB assembly adjustment items
4.1.1. Input Tool-Option, Area Option
- Option adjustment following BOM (Tool Option, Area Option)
(1) Required Equipments
: Remote control for adjustment
(2) Profile: Must be changed the option value because being
different with some setting value Depend on module
maker, inch and market.
(3) Adjustment method
The input methods are same as other chassis. (Use
IN-START key on the Adjust Remote control.)
1) Push the IN-START key in the Adjust R/C.
2) Input the Option Number that was specified in the BOM,
into the Shipping area.
3) Select “Tool Option/ Area Option” by using ▲/▼(CH+/-)
key, and press the number key(0~9) consecutively
Ex) if the value of Tool Option1 is 7, input the data using
number key “7” (If not changed the option, the input
menu can differ from the model spec.)
* Refer to Job Expression of each main chassis ass'y
(EBTxxxxxxxx) for Option value
* Before PCB check, you have to change the Tool option,
Area Option and have to AC off/on (Plug out and in)
(If missing this process, set can operate abnormally)
* Never push the IN-STOP key after completing the
function inspection.
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.
MSPG-925 series RGB
Model : 60 (1024 X 768@ 60 Hz)
OG<6K# # # OJG# # # P5575D#
Pdlq# # # Y4133# # # XWW# # # # [#
DGF0QJ# # # HGLG0QJ/#QJ# # # # # # #
#
#
#
=

Wrro#Rswlrq# # # # # # # # # # # # 54;7#

Duhd#Rswlrq################4#

- 9 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4.2. S/W program download
(1) Profile : This is for downloading the s/w to the flash
memory of IC603.
(2) Equipment
1) PC
2) MTK_tool program
3) Download jig
4) USB
(3) Connection structure
(4) Connection condition
1) IC name and circuit number : Flash Memory and IC603
2) Tact time : about 2min
4.3. Download method 1
4.3.1. Preliminary steps
(1) Connect the download jig to 4pin jack (P303)
(2) Connect the PC to USB jack
4.3.2. Download steps
(1) Execute ‘ISP Tool’ program in PC, then a main window will
be opened
(2) Click the Config and Change speed
(MT8223, Using Port, 115200, 4ms)
(3) Click the connect button and confirm
(4) Read and write bin file
Click “(1) Browse” tab, and then load download file (XXXX.
bin) by clicking and open.
PC Main
B/D
Download jig
4pin harness
kG



HKNGZZZDKP 

- 10 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
(5).Click “Upgrade” tab and set as below
(6) After downloading, AC Power OFF and ON.
4.4. Download method 2
1) Connection USB memory for upgrade.( File name :
Mx42A_PMN_xxxx.bin or Mx42A_PMN_xxxx.bin)
2) Press the IN START button.
3) Select the ‘Upg Fw’ menu
4) Press the ►button and wait
5) If the progressive bar 100% will be completed
- Notice: Do not plug out USB during upgrading.
5. Check EDID and Write HDCP key
- This model is no need to write. EDID data is in Program source
5.1. EDID data
(1) RGB EDID Data
(2) HDMI EDID Data
1) All data are HEXA
2) Adjustable Data :
**: week
***: year ex) when year 2008: input “12”
****: CHECK SUM (deferent along week, year)
5.2. Write HDCP key
(1) Connect D-sub Signal Cable to D-Sub Jack
(2) Input HDCP key with HDCP-key- in-program
(3) HDCP Key value is stored on Main MTK IC (MTK8223)
which is 0x80~0xA0 Addresses of 0x00~0x01 page
(EEPROM MAP PAGE0~PAGE1 / START Addr: A0 80)
(4) AC off/on and on HDCP button of MSPG925 and confirm
whether picture is displayed or not of using MSPG925
(5) HDCP Key value is different among the sets


OG<6T# # # OJG# # # P5575D#
Pdlq# # # 僚Y4133# # # XWW# # # # 7#
DGF0RN# # # HGLG0RN/# # RN# # # #
Wrro#Rswlrq# # # # # # # # # # # # # # # # # 54;7#
Duhd#Rswlrq####################4#
V|vwhp#frqwuro4#
V|vwhp#frqwuro5#
Srzhu#Rii#Klvwru|#
Xsj#Iz#
No. Item content 16bit Data
1 Manufacturer ID GSM 1E6D
2 Product ID Analog : 22867
HDMI : 22868
5953
5954
3 Year 2012 16
4 Version Analog : 1 1
Digital : 1
5 Revision Analog : 3 3
Digital : 3
6 Model Name M2442A

- 11 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. Check of White Balance
RGB_Gains are fixed data for each model.
Insert D-sub jack (I2C) 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.
6.1. Required Equipment
■ Remote controller for checking W/B
■ Color Analyzer : CA-210
■ CH: 14 (LCD MNT, Normal)
■ PC (for communication through RGB)
■ Pattern Generator (MSPG-925FS series)
6.2. Connecting diagram of equipment for
measuring (For Automatic Adjustment)
(Method 1, using IIC, You connect RGB Cable)
(Standard color coordinate and temperature when using the
CA210 equipment)
RGB_Gains are fixed data for each model
* When doing Adjustment, Please make circumstance as below.
* W/B condition
- Ambient Humidity : 20 % ~ 80 %
- Ambient Temperature : 25 ± 5 °C
7. Function Check
7.1. Check display and sound
■ Check input and Signal items. (cf. work instructions)
1. TV
2. AV (CVBS)
3. RGB (PC : 1920 x 1080 @ 60hz)(Display only)
4. HDMI
Color
Temperature
Cool 9,300k °K X=0.283 (±0.03)
Y=0.298 (±0.03)
<Test Signal>
PC Mode only
Full White
(100IRE)
Warm 6,500k X=0.313 (±0.03)
Y=0.329 (±0.03)
Color
Temperature
Cool 9,300k °K X=0.283 (±0.03)
Y=0.298 (±0.03)
<Test Signal>
RF/AV/HDMI
Inner pattern
(216gray,
85IRE)
Medium 8,000k °K X=0.295 (±0.03)
Y=0.305 (±0.03)
Warm 6,500k °K X=0.313 (±0.03)
Y=0.329 (±0.03)
Luminance
(cd/m2)
Cool Min: 170 Typ : 200 <Test Signal>
(Full white,
100IRE)
Medium Min: 170 Typ : 200
Warm Min: 170 Typ : 200

- 12 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. NO POWER-Main PCBA
Is Adapter
Output VOLTAGE 19.4V
through of JK700?
NO POWER
Is 3.3V at C771?
Check waveform of X600
YES
NO
YES
NO
YES
check open or short at Line.
or change Adapter.
check the Lines of IC701,
If there is any problem at Line,
Change IC701
NO
Check Line short or open between
IC600 and X600,
Change IC600 or change X600
1
2
4
Is 5V at C716?
is 1.1V at C737?
3
YES
check the Lines of IC704,IC706
If there is any problem at Line,
Change IC704,IC706.
NO
Insert F/W
is 3.3V at 1pin of P200?
when push power key,
Is 0v at 4pin of P200?
Change control
Or check Line short or open of P200
5
is there any waver at 3pin of P200,
when use remote controller?
6
NO
YES
change IR board
Or check Line short or open of P200
NO
4
X600

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2. No raster (Power LED blue, black screen)
Is 19.4V at JK700?
NO RASTER
(Screen is not displayed)
Insert the F/W back
or REPLACE LCD MODULE
Is 1.1V at L701?
Is 3.3V at L712?
Is 1.25V at 2pin of IC702?
Is 2.5V at 2pin of IC703?
YES
NO
YES
NO
YES
Check Line short or open between
IV701/IC704 and IC600,
If there is any problem at Line,
Change IC701/IC704 or change IC600
NO check open or short at Line and wafer
between IC702,IC703 and IC600.
If there is any problem at Line,
Change IC702,IC703 or IC600
1
2
is 3V at 1pin of IC800?
YES
It is not over 3V at 1pin of IC800.
Change Q801.
Or check Line short or open between
R803 and 95pin of IC600.
Change IC 600.
4
3
NO
check open or short at Line.
or change Adapter
is 5V at 1pin of P201?
If is not under 1.5V at R744,
change Q702 or check open and short
of Line among Q703 and Q702.
If is under 4.8V at L710,
Check open and short
Of line between L710 and P201.
6NO
Put into LVDS cable completely?
LVDS cable have damage?
NO
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
5
YES
YES

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3. Abnormal/No screen (All input)-Main PCBA
Put into LVDS cable completely?
LVDS cable have damage?
Abnormal/No screen
(all input)
Check waveform at signal
line of P201 (Clock:10,11,22,23
Data: 8,9,12,13,15,16,18,19,20,
21,25,26,27,28,29,30)
YES
NO
YES
NO
YES
If LVDS cable isn’t insulted enough,
Insult LVDS cable until locking hook.
If LVDS cable have damage,
Change LVDS cable
1
Change module
WAVEFORMS
3
Is 5V at 1pin of P201?
If is not under 1.5V at R744,
change Q702 or check open and short
of Line among Q703 and Q702.
If is under 4.8V at L710,
Check open and short
Of line between L710 and P201.
2
3NO Check open and short
Of line between Q703 and P201.
Or Check LVDS cable have damage.
Another is change IC600.
8,9,12,13,15,16,18,19,20,21,
25,26,27,28,29,30Pin of P201
(Data Line)
10,11,22,23Pin of P201
(Clock line)

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. Abnormal screen (TV)-Main PCBA
Put into RF cable completely?
Abnormal screen (TV)
YES
NO
NO
insult RF cable tight and then
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
Is 5V at 5pin of TU401?
2
Is I2C waveform
At 6,7pin of TU401?
3
4Is IF waveform at 67
,68 pin of IC600?
NO
NO
3
7Pin of TU401 (SCL) 6Pin of TU401 (SDA)
4
67, 68pin of IC600
If 4.9V is not at plus pin of L705, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Another is change IC706
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5. Abnormal screen (AV)-Main PCBA
Put into AV cable completely?
Abnormal screen (AV)
YES
NO
NO
Insult AV cable tight
1
Change IC600
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing to 480I, 576I
Or change f ormat CVBS
2
Is waveform at R651
3Check Line between JK101 and IC600
is open or short, Another is
change AV cable
NO
YES
YES
R651 (CVBS)
3

- 17 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
6. Abnormal screen (RGB PC)-Main PCBA
Put into RGB
cable completely?
Abnormal screen (RGB PC)
YES
NO
NO
insult RGB cable tight
1
Change IC600
WAVEFORMS
Is Input signal timing
and format in spec?
Change Timing according to
product spec, Or change format to RGB
2
Is waveform at R628,
R630, R634
3Check Line between P302 and IC600
is open or short, Another is
Change RGB cable
NO
YES
YES
3
R630(G) R634(R) R628(B)

- 18 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
7. Abnormal screen (HDMI)-Main PCBA

- 19 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
8. No sound (all source )-Main PCBA
Does wire connect P501 with speaker?
NO sound (All source)
YES
NO
YES
NO
YES
Connect wire between P501 and speaker.
1
Change speaker and wire
Is 19.4V at 2,34,40,44pin
of IC502 ?
If 8V is not plus at L703, check
of JK700 is open.
If is not Check Line between L703
and IC502 is open or short.
.Another is change IC502
2
NO
Is 3.3V at 13,27pin of IC502?
If 3V is not plus 13,27pin of IC502,
check It is over 3V at L501,L504,
if it is not, Check Line between L712
and IC502 is open or short.
Another is change IC701,IC502
NO
3
4
YES
Is I2C waveform at
23,24pin of IC502?
Check Line between IC502 and IC600
is open or short, Another is change
IC502 or IC600.
NO
5
Is I2S waveform at
R510,R511,R512,R513?
6
Check Line between IC501 and IC600
is open or short, Another is change
IC502 or IC600.
YES
Is there any waveform P501?
Check Line between IC502 and P501
is open or short. And then check resistance
of speaker is under 4ohm.
Another is change IC502
NO
4
23pin of IC502 24pin of IC502
5
R513(SDO) R511(WS) R512(SCK)
5
R510(MCLK)
6
1pin of P501(Audio out)

- 20 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
9. Abnormal sound (TV)-Main PCBA
Put into RF cable completely?
Abnormal sound (TV)
YES
NO
NO
insult RF cable tight and then
Cable nut screw tight.
1
Change Main PCBA
WAVEFORMS
Is 5V at 5pin of TU401?
If 4.9V is not at plus pin of L706, check
It is over 3V at 2pin of IC706,
if it is not, Check Line between IC706
and IC600 is open or short.
Another is change IC706
2
Is I2C waveform
At 6,7pin of TU401?
3Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
4Is IF waveform at 67
,68 pin of IC600?
Check Line between TU401 and IC600
is open or short, Another is change
IC600 or TU401
NO
NO
3
7Pin of TU401 (SCL) 6Pin of TU401 (SDA)
4
67,68 pin of IC604