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LCD TV
SERVICE MANUAL
CHASSIS : LD89D
MODEL : 37LG6000 37LG6000-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS
CONTENTS .............................................................................................. 2
PRODUCT SAFETY ..................................................................................3
SPECIFICATION ........................................................................................6
ADJUSTMENT INSTRUCTION ...............................................................15
TROUBLE SHOOTING ............................................................................17
BLOCK DIAGRAM...................................................................................24
EXPLODED VIEW .................................................................................. 25
SVC. SHEET ...............................................................................................
Copyright C 2008 LG Electronics. Inc. All right reserved. -2- LGE Internal Use Only
Only for training and service purposes
SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Replacement Parts List.
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 Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC Do not use a line Isolation Transformer during this check.
power line. Use a transformer of adequate power rating as this Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
protects the technician from accidents resulting in personal injury between a known good earth ground (Water Pipe, Conduit, etc.)
from electrical shocks. and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
It will also protect the receiver and it's components from being with 1000 ohms/volt or more sensitivity.
damaged by accidental shorts of the circuitry that may be Reverse plug the AC cord into the AC outlet and repeat AC voltage
inadvertently introduced during the service operation. measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
If any fuse (or Fusible Resistor) in this TV receiver is blown, 0.5mA.
replace it with the specified. In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
When replacing a high wattage resistor (Oxide Metal Film Resistor, repaired before it is returned to the customer.
over 1W), keep the resistor 10mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
AC Volt-meter
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 Good Earth Ground
shock. such as WATER PIPE,
To Instrument's CONDUIT etc.
0.15uF
Leakage Current Cold Check(Antenna Cold Check) exposed
METALLIC PARTS
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 1.5 Kohm/10W
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 1M and 5.2M.
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.
Copyright C 2008 LG Electronics. Inc. All right reserved. -3- LGE Internal Use Only
Only for training and service purposes
SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES
manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as
SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or
NOTE: If unforeseen circumstances create conflict between the exposure of the assembly.
following servicing precautions and any of the safety precautions on 3. Use only a grounded-tip soldering iron to solder or unsolder ES
page 3 of this publication, always follow the safety precautions. devices.
Remember: Safety First. 4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
General Servicing Precautions electrical charges sufficient to damage ES devices.
1. Always unplug the receiver AC power cord from the AC power 5. Do not use freon-propelled chemicals. These can generate
source before; electrical charges sufficient to damage ES devices.
a. Removing or reinstalling any component, circuit board 6. Do not remove a replacement ES device from its protective
module or any other receiver assembly. package until immediately before you are ready to install it.
b. Disconnecting or reconnecting any receiver electrical plug or (Most replacement ES devices are packaged with leads
other electrical connection. electrically shorted together by conductive foam, aluminum foil
c. Connecting a test substitute in parallel with an electrolytic or comparable conductive material).
capacitor in the receiver. 7. Immediately before removing the protective material from the
CAUTION: A wrong part substitution or incorrect polarity leads of a replacement ES device, touch the protective material
installation of electrolytic capacitors may result in an to the chassis or circuit assembly into which the device will be
explosion hazard. installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
2. Test high voltage only by measuring it with an appropriate high and observe all other safety precautions.
voltage meter or other voltage measuring device (DVM, 8. Minimize bodily motions when handling unpackaged
FETVOM, etc) equipped with a suitable high voltage probe. replacement ES devices. (Otherwise harmless motion such as
Do not test high voltage by "drawing an arc". the brushing together of your clothes fabric or the lifting of your
3. Do not spray chemicals on or near this receiver or any of its foot from a carpeted floor can generate static electricity sufficient
assemblies. to damage an ES device.)
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the General Soldering Guidelines
contacts with a pipe cleaner, cotton-tipped stick or comparable 1. Use a grounded-tip, low-wattage soldering iron and appropriate
non-abrasive applicator; 10% (by volume) Acetone and 90% (by tip size and shape that will maintain tip temperature within the
volume) isopropyl alcohol (90%-99% strength) range or 500 F to 600 F.
CAUTION: This is a flammable mixture. 2. Use an appropriate gauge of RMA resin-core solder composed
Unless specified otherwise in this service manual, lubrication of of 60 parts tin/40 parts lead.
contacts in not required. 3. Keep the soldering iron tip clean and well tinned.
5. Do not defeat any plug/socket B+ voltage interlocks with which 4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
receivers covered by this service manual might be equipped. bristle (0.5 inch, or 1.25cm) brush with a metal handle.
6. Do not apply AC power to this instrument and/or any of its Do not use freon-propelled spray-on cleaners.
electrical assemblies unless all solid-state device heat sinks are 5. Use the following unsoldering technique
correctly installed. a. Allow the soldering iron tip to reach normal temperature.
7. Always connect the test receiver ground lead to the receiver (500 F to 600 F)
chassis ground before connecting the test receiver positive lead. b. Heat the component lead until the solder melts.
Always remove the test receiver ground lead last. c. Quickly draw the melted solder with an anti-static, suction-
8. Use with this receiver only the test fixtures specified in this type solder removal device or with solder braid.
service manual. CAUTION: Work quickly to avoid overheating the circuitboard
CAUTION: Do not connect the test fixture ground strap to any printed foil.
heat sink in this receiver. 6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
Electrostatically Sensitive (ES) Devices (500 F to 600 F)
Some semiconductor (solid-state) devices can be damaged easily b. First, hold the soldering iron tip and solder the strand against
by static electricity. Such components commonly are called the component lead until the solder melts.
Electrostatically Sensitive (ES) Devices. Examples of typical ES c. Quickly move the soldering iron tip to the junction of the
devices are integrated circuits and some field-effect transistors and component lead and the printed circuit foil, and hold it there
semiconductor "chip" components. The following techniques should only until the solder flows onto and around both the
be used to help reduce the incidence of component damage component lead and the foil.
caused by static by static electricity. CAUTION: Work quickly to avoid overheating the circuit
1. Immediately before handling any semiconductor component or board printed foil.
semiconductor-equipped assembly, drain off any electrostatic d. Closely inspect the solder area and remove any excess or
charge on your body by touching a known earth ground. splashed solder with a small wire-bristle brush.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
Copyright C 2008 LG Electronics. Inc. All right reserved. -4- LGE Internal Use Only
Only for training and service purposes
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair
which the IC leads are inserted and then bent flat against the circuit Excessive heat applied to the copper foil of any printed circuit
foil. When holes are the slotted type, the following technique should board will weaken the adhesive that bonds the foil to the circuit
be used to remove and replace the IC. When working with boards board causing the foil to separate from or "lift-off" the board. The
using the familiar round hole, use the standard technique as following guidelines and procedures should be followed whenever
outlined in paragraphs 5 and 6 above. this condition is encountered.
Removal At IC Connections
1. Desolder and straighten each IC lead in one operation by gently To repair a defective copper pattern at IC connections use the
prying up on the lead with the soldering iron tip as the solder following procedure to install a jumper wire on the copper pattern
melts. side of the circuit board. (Use this technique only on IC
2. Draw away the melted solder with an anti-static suction-type connections).
solder removal device (or with solder braid) before removing the
IC. 1. Carefully remove the damaged copper pattern with a sharp
Replacement knife. (Remove only as much copper as absolutely necessary).
1. Carefully insert the replacement IC in the circuit board. 2. carefully scratch away the solder resist and acrylic coating (if
2. Carefully bend each IC lead against the circuit foil pad and used) from the end of the remaining copper pattern.
solder it. 3. Bend a small "U" in one end of a small gauge jumper wire and
3. Clean the soldered areas with a small wire-bristle brush. carefully crimp it around the IC pin. Solder the IC connection.
(It is not necessary to reapply acrylic coating to the areas). 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
"Small-Signal" Discrete Transistor copper pattern. Solder the overlapped area and clip off any
Removal/Replacement excess jumper wire.
1. Remove the defective transistor by clipping its leads as close as
possible to the component body. At Other Connections
2. Bend into a "U" shape the end of each of three leads remaining Use the following technique to repair the defective copper pattern
on the circuit board. at connections other than IC Pins. This technique involves the
3. Bend into a "U" shape the replacement transistor leads. installation of a jumper wire on the component side of the circuit
4. Connect the replacement transistor leads to the corresponding board.
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder 1. Remove the defective copper pattern with a sharp knife.
each connection. Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
Power Output, Transistor Device 2. Trace along the copper pattern from both sides of the pattern
Removal/Replacement break and locate the nearest component that is directly
1. Heat and remove all solder from around the transistor leads. connected to the affected copper pattern.
2. Remove the heat sink mounting screw (if so equipped). 3. Connect insulated 20-gauge jumper wire from the lead of the
3. Carefully remove the transistor from the heat sink of the circuit nearest component on one side of the pattern break to the lead
board. of the nearest component on the other side.
4. Insert new transistor in the circuit board. Carefully crimp and solder the connections.
5. Solder each transistor lead, and clip off excess lead. CAUTION: Be sure the insulated jumper wire is dressed so the
6. Replace heat sink. it does not touch components or sharp edges.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible 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.
Copyright C 2008 LG Electronics. Inc. All right reserved. -5- LGE Internal Use Only
Only for training and service purposes
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. General Specification(TV)
No. Item Specification Remark
1. Video input applicable system PAL-D/K, B/G, I, SECAM
2. Receivable Broadcasting System 1) PAL/SECAM B/G EU(PAL Market)
2) PAL/SECAM D/K
3) PAL I/II
4) SECAM L/L'
5) DVB-T
3. RF Input Channel VHF : E2 ~ E12 PAL
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21~ S47
4. Input Voltage AC 100 ~ 240 V/50Hz, 60Hz
5. Picture Size 37 inch 37LG6000/42LG6000/47LG6000
42 inch
47 inch
6. Tuning System FVS 100 program PAL, 200 PR.(Option)
7. Operating Environment 1) Temp : 0 ~ 40 deg LGE SPEC
2) Humidity : 10 ~ 90 %
8. Storage Environment 3) Temp : -20 ~ 50 deg LGE SPEC
4) Humidity : 10 ~ 90 %
9. Display LCD Module LPL
Copyright C 2008 LG Electronics. Inc. All right reserved. -6- LGE Internal Use Only
Only for training and service purposes
2. General Specification(LCD Module)
No Item Specification Unit Remark
1. Panel 37" TFT WUXGA LCD 37LG6000
42" TFT WUXGA LCD 42LG6000
47" TFT WUXGA LCD 47LG6000
2. Frequency range H : 64.1 ~ 67.5Khz, V : 57 ~ 63Hz 37 inch
H : 121.8 ~ 136.4Khz, V : 108.2 ~ 121.2Hz 42 inch
H : 121.8 ~ 136.4Khz, V : 108.2 ~ 121.2Hz 47 inch
3. Power consumption 37 inch 10.76 + 132 W LCD + Backlight
42 inch 9.4(Max) + 160.8(Typ) W
47 inch TBD + 240(Max) W
4. LCD Module-LPL Type Size 37" 877 x 516.8 x 55.5 mm (H)x (V)x(D)
42" 983.0 x 576.0 x 47.3
47" 1096.0 x 640.0 x 50
Pixel Pitch 37" 0.42675 x 0.42675 mm
42" 0.4845 x 0.4845
47" 0.5415 x 0.5415
Pixel Format 1920 horiz. By 1080 vert. 37/42/47 inch
Pixels RGB stripe arrangement
Coating Hard coating(3H), Anti-glare treatment
of the front polarizer(Haze 13%)
Back Light 37" 16 Lamp(EEFL)
42" 18 Lamp(EEFL)
47" 22 Lamp(CCFL)
Copyright C 2008 LG Electronics. Inc. All right reserved. -7- LGE Internal Use Only
Only for training and service purposes
3. Optical Feature(LCD Module)
No. Item Specification Min. Typ. Max. Remark
1. Viewing Angle(CR>10) R/L, U/D 178, 178
2. Luminance Luminance (cd/m2) 400 500 42" without PC (PC: min 300)
Variation - 1.3 MAX / MIN
3. Contrast Ratio CR(37") 1000 1400 All white/All black
CR(42") 1000 1400 without PC (PC:min400)
CR(47") TBD 1500
4. CIE Color Coordinates White WX Typ 0.279 Typ 37 inch
WY -0.03 0.292 +0.03
RED Xr 0.641
Yr 0.334
Green Xg 0.291
Yg 0.614
Blue Xb 0.145
Yb 0.062
White WX Typ 0.279 Typ 42 inch
WY -0.03 0.292 +0.03
RED Xr 0.640
Yr 0.335
Green Xg 0.289
Yg 0.610
Blue Xb 0.144
Yb 0.066
White WX Typ 0.279 Typ 47 inch
WY -0.03 0.292 +0.03
RED Xr 0.636
Yr 0.334
Green Xg 0.291
Yg 0.613
Blue Xb 0.146
Yb 0.061
1) Standard Test Condition
2) Surrounding Brightness Level : dark
3) Surrounding Temperature : 25±2°C
4) warm-up Time : 30 Min
5) Input Signal : VESA XGA 60Hz
- Contrast, Brightness : Max.
- Clock/Clock Phase : accurate adjustment
Copyright C 2008 LG Electronics. Inc. All right reserved. -8- LGE Internal Use Only
Only for training and service purposes
4. Optical Feature(SET)
No. Item Specification Min. Typ. Max. Remark
1. Luminance Luminance (cd/m2) 400 450 HDMI
350 400 RF, AV, RGB
Variation - 1.3 MAX / MIN
2 Contrast Ratio CR(37") 900 1400 All white/All black
CR(42") 900 1400 without PC (PC:min400)
CR(47") 900 1300
5. Component Video Input (Y, PB, PR)
Specification
No. Remark
Resolution H-freq(kHz) V-freq(Hz)
1. 720x480 15.73 60.00 SDTV, DVD 480i
2. 720x480 15.63 59.94 SDTV, DVD 480i
3. 720x480 31.47 59.94 SDTV, 480p
4. 720x480 31.50 60.00 SDTV, 480p
5. 720x576 15.625 50.00 SDTV, DVD 625 Line
6. 720x576 31.25 50.00 HDTV 576p
7. 1280x720 45.00 60.00 HDTV 720p
8. 1280x720 44.96 59.94 HDTV 720p
9. 1280x720 37.50 50 HDTV 720p 50Hz
10. 1920x1080 31.25 50.00 HDTV 1080i
11. 1920x1080 33.75 60.00 HDTV 1080i
12. 1920x1080 33.72 59.94 HDTV 1080i
13. 1920x1080 56.25 50.00 HDTV 1080P
14. 1920x1080 67.433 59.94 HDTV 1080P
15. 1920x1080 67.50 60 HDTV 1080P
6. RGB Input (PC)
No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
1. 720x400 31.468 70.08 28.32
2. 640x480 31.469 59.94 25.17 VESA
3. 800x600 37.879 60.31 40.00 VESA
4. 1024x768 48.363 60.00 65.00 VESA(XGA)
5. 1280x768 47.78 59.87 79.5 VESA(WXGA)
6. 1360x768 47.72 59.8 84.625 VESA(WXGA)
7. 1920x1080 66.647 59.988 138.625 WUXGA
8. 1280x1024 63.981 60.02 108 SXGA(Only FHD)
9. 1400x1050 65.317 59.978 121.75 SXGA(Only FHD)
Copyright C 2008 LG Electronics. Inc. All right reserved. -9- LGE Internal Use Only
Only for training and service purposes
7. HDMI DTV
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed Remark
1. 640x480 31.469 59.94 25.175 SDTV 480p 60Hz
2. 640x480 31.469 60 25.20 SDTV 480p 60Hz
3. 720x480 31.47 59.94 27.00 SDTV 480p 60Hz
4. 720x480 31.50 60 27.027 SDTV 480p 60Hz
5. 720x576 31.25 50.00 27.000 SDTV 576p 50Hz
6. 1280x720 37.50 50.00 74.176 HDTV 720p 50Hz HDCP
7. 1280x720 44.96 59.94 74.176 HDTV 720p 60Hz HDCP
8. 1280x720 45.00 60 74.250 HDTV 720p 60Hz HDCP
9. 1920x1080 28.125 50.00 74.250 HDTV 1080i 50Hz HDCP
10. 1920x1080 33.72 59.94 74.176 HDTV 1080i 60Hz HDCP
11. 1920x1080 33.75 60 74.250 HDTV 1080i 60Hz HDCP
12. 1920x1080 27.000 24.00 74.250 HDTV 1080P 24Hz HDCP
13. 1920x1080 33.750 30 74.25 HDTV 1080P 30Hz HDCP
14. 1920x1080 56.25 50.00 148.500 HDTV 1080P 50Hz HDCP
15. 1920x1080 67.433 59.94 148.352 HDTV 1080P 60Hz HDCP
16. 1920x1080 67.50 60 148.500 HDTV 1080P 60Hz HDCP
8. HDMI input ( DTV )
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Proposed Remark
1. 720x400 31.468 70.08 28.32
2. 640x480 31.469 59.94 25.17 VESA
3. 800x600 37.879 60.31 40.00 VESA
4. 1024x768 48.363 60.00 65.00 VESA(XGA)
5. 1280x768 47.78 59.87 80.125 VESA(WXGA)
6. 1360x768 47.72 59.8 84.625 VESA(WXGA)
7. 1280x1024 63.981 60.02 108 SXGA(Only FHD)
8. 1400x1050 65.317 59.978 121.75 SXGA(Only FHD)
9. 1920x1080 66.647 59.988 138.625 WUXGA
Copyright C 2008 LG Electronics. Inc. All right reserved. - 10 - LGE Internal Use Only
Only for training and service purposes
Copyright C 2008 LG Electronics. Inc. All right reserved. - 11 - LGE Internal Use Only
Only for training and service purposes
Copyright C 2008 LG Electronics. Inc. All right reserved. - 12 - LGE Internal Use Only
Only for training and service purposes
9. Mechanical specification
9-1. 37LG6000
No, Item Content Remark
1 Product Dimenson Width(W) Length(D) Height(H) Unit
Before Packing 929 374.7 707 mm
After Packing 1015 277 782 mm
2 Product Weight Only SET 21.7 Kg
With Box 26.2 Kg
3 Container Loading Quantity Individual or 20ft 40ft
Palletizing Indi Wooden Indi Woonden
291 291 88
4 Stand Assy Type Attachde(detachable)
Size(W x D x H) 460 375.4 234.1 mm
Tilt Degree -
Tilt force -
Swivel Degree Swivel(+/- 20degree)
Swivel Force 1.0 ~ 2.0kgf
5 Appearance Refer to Standard of LG(56)G4-9002
9-2. 42LG6000
No, Item Content Remark
1 Product Dimenson Width(W) Length(D) Height(H) Unit
Before Packing 1037.6 378 795 mm
After Packing 1330 257 844 mm
2 Product Weight Only SET 22.7 Kg
With Box 27.2 Kg
3 Container Loading Quantity Individual or 40ft 40ft(H-CUBIC)
Palletizing Indi Wooden Indi Woonden
162 243
4 Stand Assy Type Attachde(detachable)
Size(W x D x H) 520.1 379.5 265.1 mm
Tilt Degree -
Tilt force -
Swivel Degree Swivel(+/- 20degree)
Swivel Force 0.8 ~ 1.5kgf
5 Appearance Refer to Standard of LG(56)G4-9002
Copyright C 2008 LG Electronics. Inc. All right reserved. - 13 - LGE Internal Use Only
Only for training and service purposes
9-3. 47LG6000
No, Item Content Remark
1 Product Dimenson Width(W) Length(D) Height(H) Unit
Before Packing 1152.8 434.5 867.6 mm
After Packing 1255 521 961 mm
2 Product Weight Only SET 32.6 Kg
With Box 37 Kg
3 Container Loading Quantity Individual or 40ft 40ft(H-CUBIC)
Palletizing Indi Wooden Indi Woonden
82 82
4 Stand Assy Type Attachde(detachable)
Size(W x D x H) 580 434.5 286.2 mm
Tilt Degree -
Tilt force -
Swivel Degree Swivel(+/- 20degree)
Swivel Force 1.5 ~ 1.9kgf
5 Appearance Refer to Standard of LG(56)G4-9002
Copyright C 2008 LG Electronics. Inc. All right reserved. - 14 - LGE Internal Use Only
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range 3. PCB assembly adjustment method
This spec. sheet is applied to all of the LD89F chassis => Caution: Using `power on' button of the Adjustment R/C ,
manufactured at LG TV Plant all over the world. power on TV.
· ADC Calibration Protocol (RS232)
2. Specification NO Item CMD 1 CMD 2 Data 0
2.1 Because this is not a hot chassis, it is not necessary to Enter Adjust `Mode In' A D 0 0 When transfer the 'Mode In'
use an isolation transformer. However, the use of
isolation transformer will help protect test instrument. Adjust MODE Carry the command.
2.2 Adjustment must be done in the correct order. ADC adjust ADC Adjust A D 1 0 Automatically adjustment
2.3 The adjustment must be performed in the circumstance of
(The use of a internal pattern)
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation. Adjust `Mode Out' A D 9 0
2.4 The input voltage of the receiver must keep 100~240V, Adjustment A D 9 9 To check ADC Adjustment
50/60Hz.
2.5 The receiver must be operated for about 15 minutes prior Confirmation on Assembly line.
to the adjustment.
- After RGB Full White in HEAT-RUN Mode, the receiver - Baud rate : 115200 bps
must be operated prior to the adjustment. - RS232 Host : PC
- Enter into HEAT-RUN MODE
(1) Press the "POWER ON" KEY on Adjustment R/C. - echo : none
(2) Press the "ADJ KEY" on Adjustment R/C.
(3) Select "3. Test Pattern" by using D /E (CH +/-) and
press ENTER(V )
(4) Select "White" by using F /G (VOL +/-) and press
4. ADC adjustment
RF input AV / Component / RGB input
ENTER(V )
· Set is activated HEAT run without signal generator in NO SIGNAL or White noise NO SIGNAL
this mode. · Adjustment can be done using only internal ADC, so input
· Single color pattern ( RED / BLUE / GREEN ) of HEAT signal is not necessary.
RUN MODE uses to check panel. · Required equipment : Adjustment R/C.
· Caution : If you turn on a still pattern more than 20
minutes (Especially digital pattern, cross hatch 1) Press ADJ key on adjustment R/C.
pattern),an after image may be occur in the black level
part of the screen. 2) Select "1. ADC calibration" by using D /E (CH +/-) and
press ENTER(V )
3) Select "Start" by using F /G (VOL +/-) and press
ENTER(V )
4) ADC adjustment is executed automatically
Copyright C 2008 LG Electronics. Inc. All right reserved. - 15 - LGE Internal Use Only
Only for training and service purposes
5. PCMCIA CARD Checking Method * Connecting picture of the measuring instrument (On
Automatic control)
· You must adjust DTV 29 Channel and insert PCMCIA Inside PATTERN is used when W/B is controlled. Connect to
CARD to socket. auto controller or push Adjustment R/C IN-START -> Enter the
mode of White-Balance, the pattern will come out.
1) If PCMCIA CARD works normally, normal signals display
on screen. But it works abnormally, "No CA module" words
display on screen.
=> Caution: Set up "RF mode" before launching products.
6. Adjustment of White Balance
· Test Equipment
- Color Analyzer (CS-1000, CA-100+(CH.9), CA-210(CH.9) )
* Please adjust CA-100+ / CA-210 by CS-1000 before
measuring
=> You should use Channel 9 which is Matrix compensated
(White, Red, Green, Blue revised) by CS-1000 and adjust Auto-control interface and directions
in accordance with White balance adjustment coordinate 1. Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
· Color temperature standards according to CSM and Module 2. Adhere closely the Color Analyzer (CA-210) to the module
CSM LCD less than 10cm distance, keep it with the surface of the Module
and Color Analyzer's Prove vertically.(80~100°).
Cool 11000K 3. Aging time
Medium 9300K - After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
Warm 6500K
- Using `no signal' or `full white pattern' or the others, check
the back light on.
· Change target luminance and range of the Auto adjustment
W/B equipment.
6. Manual white Balance
Target luminance 65 1) Press the ADJ KEY on Adjustment R/C.
Range 20 Select "3. Test Pattern" by using D /E (CH +/-) and press
ENTER(V )
· White balance adjustment coordinate and color temperature Select "White" by using F /G (VOL +/-) and press
Cool CS-1000 CA-100+ (CH.9) CA-210 (CH.9) ENTER(V ) and heat run over 15 minutes.
2) Zero Calibrate CA-100+ / CA-210, and when controlling,
x 0.276 0.276±0.002 0.276±0.002
stick the sensor to the center of LCD module surface.
y 0.283 0.283±0.002 0.283±0.002 3) Press the ADJ KEY on Adjustment R/C
uv 0.000 0.000 0.000 4) Select "2. White Balance" and press G (VOL +)
Set test-pattern on and display inside pattern.
Medium CS-1000 CA-100+ (CH.9) CA-210 (CH.9)
5) Control is carried out on three color temperatures, COOL,
x 0.285 0.285±0.002 0.285±0.002 MEDIUM, WARM.
y 0.293 0.293±0.002 0.293±0.002
(Control is carried out three times)
uv 0.000 0.000 0.000 < Temperature: COOL >
Warm CS-1000 CA-100+ (CH.9) CA-210 (CH.9) - R-Cut / G-Cut / B-Cut is set to 64.
- Control R-Gain and G-Gain.
x 0.313 0.313±0.002 0.313±0.002
- Each gain is limited to 192.
y 0.329 0.329±0.002 0.329±0.002 < Temperature: MEDIUM >
uv 0.003 0.003 0.003 - R-Cut / G-Cut / B-Cut is set to 64.
- Control R-Gain and B-Gain.
* PC (for communication through RS-232C) => UART Baud rate : - Each gain is limited to 192.
115200 bps < Temperature: WARM >
- R-Cut / G-Cut / B-Cut is set to 64.
- Control G-Gain and B-Gain.
- Each gain is limited to 192.
* One of R Gain / G Gain / B Gain should be kept on 192, and
adjust other two lower than 192.
(When R/G/B GAIN are all 192, it is the FULL DYNAMIC Range
of Module)
Copyright C 2008 LG Electronics. Inc. All right reserved. - 16 - LGE Internal Use Only
Only for training and service purposes
TROUBLE SHOOTING
1. Power Board
1-1. The whole flowchart which it follows in voltage output state
Start check
Does not screen Yes Is it identical with No Is the Interface
whole comes out? power off condition? signal operated?
Yes Yes
No 2. Check the
1. Check the Power off condition Interface signal condition
Does not low Yes Does not the No Does not the No Does not the No Does not the VSC
voltage output comes out? St-by 5V(P-5V) signal comes out? AC Detect signal comes out? RL_ON/PWR_ON/OFF comes out? Low Voltage output comes out?
Yes Yes Yes Yes
No 3. Check the 4. Check the 5. Check the VSC RL_ON? 6. Check the
St_by 5V signal circuit AC Detect signal circuit PWR_ON/OFF signal VSC low Voltage output
Does not Inverter Yes Does not the No Does not the
signal output comes out? VSC signal INV_CTL comes out? INV 24V voltage output comes out?
Yes Yes
8. Check the
No 7. Check the VSC INV_CTL signal
INV 24V voltage output circuit
Manufacture enterprise
meaning of a passage
Copyright C 2008 LG Electronics. Inc. All right reserved. - 17 - LGE Internal Use Only
Only for training and service purposes
2. No Power
Symptom
1) It does not charge at module.
2) Front LED does not work
Check the followings
No
A power cord is plugged in with TV set? Plug the power cord in.
Yes
No
Is AC-INLET connected with the power board? Connect the AC-INLET.
Yes
No
Are the fuses(F100, F101 or F700) OK on the power board? Replace the fuses.
Yes
No
Is the power board connected with VSC Board though a cable? Connect a cable.
Yes
Measure output voltages(16V,12V,5V) on the power board.
If the measured values are not a proper value,
replace power board.
Copyright C 2008 LG Electronics. Inc. All right reserved. - 18 - LGE Internal Use Only
Only for training and service purposes
3. No Raster
Symptom
1) No OSD and image occur on the screen.
2) It maintains the condition with the front LED is white.
Check the followings
No Is the Inverter No
Does Module control signal OK?
OK?
Yes
Yes
Check the LCD Is Low/High voltage outputs properly
Module except stand-by 5V?
No
Is the LVDS No Reconnect Replace the
cable OK? the LVDS cable in P501 or P502. Power board.
Yes
No
Is the IC100 (FLI106X0H)
Replace the VSC
Output normal?
Copyright C 2008 LG Electronics. Inc. All right reserved. - 19 - LGE Internal Use Only
Only for training and service purposes
Copyright C 2008 LG Electronics. Inc. All right reserved. - 20 - LGE Internal Use Only
Only for training and service purposes
2) In case of abnormal display on the screen in specific mode
Symptom
1) The screen does not display the picture from specific input mode
(RF,DTV, AV, Component, RGB, HDMI).
Check the followings
In case of abnormal display on the screen when RF mode.
No Yes
Is the RF cable Is the input voltage and CVBS output
Is the tuner OK?
connected with TV set? for the tuner OK?
No No
Yes Connect the RF cable. Replace the tuner.
Block A
No Is the IIC communication waveform No
Is IC100(FLI106X0H) OK? Replace IC100(FLI106X0H)
between the tuner and IC100 OK?
In the case of abnormal display on the screen when USB mode.
No
Is USB 5V Power OK? Replace IC902
Yes
Is USD DP/DM
waveform OK?
No
Same as Block A
Copyright C 2008 LG Electronics. Inc. All right reserved. - 21 - LGE Internal Use Only
Only for training and service purposes
In the case of abnormal display on the screen when side AV1,2 / AV3 mode.
No
Is video input of the AV Check the input source.
(JK100,JK101,JK103) OK?
Yes
Same as Block A
In the case of abnormal display on the screen when Component, RGB mode.
Is R,G,B input and H/V No
Check the input source.
sync of the JK102,P101 OK?
Yes
Same as Block A
In the case of abnormal display on the screen when HDMI1,2,3 mode.
Is the HDMI switch No Is the TMDS waveform between No
Replace IC200
(IC200) OK? the IC and HDMI jacks OK?
Yes
Same as Block A
In the case of abnormal display on the screen when HDMI4 mode.
Is the HDMI Jack No Is the TMDS waveform between No
Replace JK204
(JK204) OK? the IC and HDMI jacks OK?
Yes
Same as Block A
Copyright C 2008 LG Electronics. Inc. All right reserved. - 22 - LGE Internal Use Only
Only for training and service purposes
5. In case of no sound
Symptom
1) LED is green
2) Screen display but sound is not output
Check follow
Is All input (mode) No Is the output speaker No
Set the output speaker on.
no sound? turned on?
Yes Yes
Is Only HDMI No Is a speaker No
Download the EDID data. Connect the speaker cable.
no sound? cable connected?
Yes
Check the tuner
Is Only RF no sound?
No SIF, AM Audio Input.
Yes
No
IC603 is OK? Replace IC603 (MSP4458).
Yes
No
IC600 is OK? Replace IC600(NTP3000A).
Yes
Replace VSC board.
Copyright C 2008 LG Electronics. Inc. All right reserved. - 23 - LGE Internal Use Only
Only for training and service purposes
BLOCK DIAGRAM
Copyright C 2008 LG Electronics. Inc. All right reserved. - 24 - LGE Internal Use Only
Only for training and service purposes
EXPLODED VIEW
400
542
540
532
520
805
900
570
800
901
541
804
550
803
530
806
531
200
802
801
200T
510
820