Internal Use Only

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LCD TV SERVICE MANUAL

CHASSIS : LP7BB

MODEL : 42LB9RT

CAUTION

42LB9RT-MD

BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

CONTENTS

CONTENTS.... 2 SAFETY PRECAUTIONS...3 SPECIFICATION...6 ADJUSTMENT INSTRUCTION...10 TROUBLE SHOOTING...14 BLOCK DIAGRAM...25 EXPLODED VIEW.... 26 EXPLODED VIEW PARTS LIST..27 REPLACEMENT PARTS LIST... 28 SVC. SHEET....
Copyright 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes

LGE Internal Use Only

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

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 1W), keep the resistor 10mm away from PCB. Keep wires away from high voltage or high temperature parts.
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 1.5K/10watt resistor in parallel with a 0.15uF 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 0.5mA. 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
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.

AC Volt-meter

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 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.
To Instruments exposed METALLIC PARTS

0.15uF

Good Earth Ground such as WATER PIPE, CONDUIT etc.

1.5 Kohm/10W

Replaceable batteries
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE. DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS

ADVARSEL

Lithiumbatteri - Eksplosionsfare ved fejlagtig hndtening. Udskiftning m kun ske med batteri at samme fabrikat og type. Levr det brugte batteri tilbage til leverandoren

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 conflict 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 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 explosion 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 specified 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 flammable mixture. Unless specified 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 fixtures specified in this service manual. CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver. Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip" components. The following techniques should be used to help reduce the incidence of component damage caused by static 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. 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. 2. After removing an electrical assembly equipped with ES devices, place the assembly on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. Use only an anti-static type solder removal device. Some solder removal devices not classified as "anti-static" can generate electrical charges sufficient to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not remove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive material). 7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient 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 500F to 600F. 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 wirebristle (0.5 inch, or 1.25cm) 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. (500F to 600F) b. Heat the component lead until the solder melts. c. Quickly draw the melted solder with an anti-static, suctiontype 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 (500F to 600F) 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 flows onto and around both the component 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.

IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit 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 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.
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 connections). 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 connected 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.

SPECIFICATION

NOTE : Specifications and others are subject to change without notice for improvement.

1. Application range

This spec sheet is applied to the LCD TV used LP7BB chassis

2. Specification

Each part is tested as below without special appointment. (1) Temperature : 25 5C(77 9F), CST : 40 5C (2) Relative Humidity : 65% 10% (3) Power Voltage : Standard input voltage (100-240V~, 50/60Hz) *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 20 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 TV Specification
No 1. 2. Item Video input applicable system Receivable Broadcasting System 1) NTSC 2) PAL M 3) PAL N 3. RF Input Channel BAND VHF UHF CATV 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Input Voltage Market Operating Environment Storage Environment Power Consumption Stand by Frequency range Video Input (2EA) S-Video Input (1EA) Component Input (2EA) RGB Input (1EA) HDMI Input (2EA) Audio Input (5EA) Audio variable out (1EA) USB Input (1EA) AV out (1EA) DivX, MP3, JPEG NTSC 2 ~ ~ ~ 125 Specification NTSC-M, PAL M/N Remark
100-240V~ / 50Hz, 60Hz Central & South America 1) Temp : 0 ~ 40 deg 2) Humidity : 10 ~ 90 %RH 1) Temp : -20 ~ 50 deg 2) Humidity : 10 ~ 90 %RH Power on (Green) Cool Warm V : 56 ~ 75 Hz NTSC, PAL M/N NTSC, PAL M/N Y/Cb/Cr, Y/Pb/Pr RGB-PC HDMI-PC HDMI-DTV PC Audio, Component (2EA), AV(2EA) L/R Input Side only 260(42) 220(32) 1W(32, 42) 40W(32, 42) When recordign the manual recording PC Input

H : 31 ~ 61 khz

5. General Module Specification
No 1. 2. Panel LCD Module Outline Dimension Pixel Pitch Pixel Format Coating Back Light 42" 32" 42" 32" 42" 32" Item Specification 42" TFT WXGA LCD 32" TFT WXGA LCD 983 x 576 x 47.3 760.0 x 450.0 x 48.0 0.227 x 0.681 x RGB 0.17025 x 0.51075 x RGB 1366 x 768 Pixels RGB strip arrangement Hard coating(3H), Anti-glare treatment of the front polarizer, 18CCFL 18CCFL mm (H)mm x (V)mm x (D)mm Remark
6. Set Optical Feature (LCD Module)
No 1. 2. 3. Item Luminance View angle (R/L, U/D) White coordinate Red Green Blue 4. 5. Contrast ratio Luminance Variation White X Y X Y X Y X Y CR -0.03 Min 400 Typ 500 178/178 0.279/0.279/0.279 +0.03 0.292/0.292/0.292 0.635/0.636/0.635 0.339/0.343/0.344 0.282/0.284/0.286 0.606/0.615/0.614 0.145/0.144/0.146 0.064/0.063/0.1000 1.3 32" 42" LPL(0-RT) LPL(0-RT) degree Max Unit Maker LPL(0RT) 32",42" LPL 32, 42 Remark - 50cm from the surface - Full White Pattern - CR > 10

7. ADC Calibration

ADC MSPG925FA RF/AV/S-VIDEO PAL INPUT AV3-ZF SELECT AV1-TB Model: 202 (PAL-BGDHI) Pattern: 65 Model:201 (NTSC) Pattern: 65 NTSC VIDEO1 -MA Component Model:217 720P Pattern:65 * 100% Color Bar RGB Model: 60 1024*768 60Hz Pattern: 65 * 100% Color Bar
* 100% Color Bar * 100% Color Bar
=> Caution : - System control RS-232 Host should be "PC" for adjustment. Press the FRONT-AV KEY on R/C for converting input mode. (change RS-232 Host : pc, Band Rate : 115200bps) 7.1 Adjustment of RF/AV/S-VIDEO * Required Equipments - Remote controller for adjustment - 802F Pattern Generator, Master (MSPG-925FA), etc. - MSPG-925FA Pattern Generator (Which has Video Signal: 100% Color Bar Pattern shown in Fig. 2) => Model: 202 / Pattern : 65
6.1.2 HDMI(256 Bytes ) BLOCK1 (128BYTE)
BLOCK2 (128BYTE) (Fig. 2) 7.1.1 Method of Auto RF/AV/S-VIDEO Color Balance. 1) Press the FRONT-AV KEY on R/C for converting input mode. 2) Input the Video Signal: 100% Color Bar signal into AV 3) Set the PSM to Dynamic mode in the Picture menu. 4) Press INSTART key on R/C for adjustment. 5) Press the (Vol. +) key to operate the set, then it becomes automatically 6) Auto-RGB OK means the adjustment is completed 7.1.2 Requirement - This AV color balance adjustment should be performed before White Balance Adjustment. - After AV color balance adjustment, Change the mode from AV to RF. (Cancel Heat-run mode.)

- 11 -

7.2 Adjustment of Component. * Required Equipments - Remote controller for adjustment - 802F Pattern Generator, Master (MSPG-925FA), etc - MSPG-925FA Pattern Generator (Which has 720p@60Hz YPbPr signal : 100% Color Bar Pattern shown in Fig. 3 ) => Model: 217 / Pattern: 65 - It is very import to use correct adjustment pattern like Fig.3. a. Within the pattern, color sequence should be aligned : White-Yellow-Cyan-Green-Magenta-Red-BLUEBLACK (If color sequence is reversed (Black -> -> White), reverse the pattern with REV key, when using Master pattern generator like MSPG-925) b. If Minimum Black Level and/or Maximum White Level is not correct, Do select 100% Color Bar Pattern.
7.3 Adjustment of RGB * Required Equipments - Remote controller for adjustment - 802F Pattern Generator, Master (MSPG-925FA), etc - MSPG-925FA Pattern Generator (Which has XGA [1024*768] 60Hz PC Format output signal : 100% Color Bar Pattern shown in Fig. 4 ) - It is very import to use correct adjustment pattern like Fig. 4. a. Within the pattern, color sequence should be aligned : White-Yellow-Cyan-Green-Magenta-Red-BLUEBLACK (If color sequence is reversed (Black -> -> White), reverse the pattern with REV key, when using Master pattern generator like MSPG-925) b. If Minimum Black Level and/or Maximum White Level is not correct, Do select 100% Color Bar Pattern
(Fig. 4) (Fig. 3) 7.2.1 Method of Auto Component Color Balance 1) Input the Component 720p 100% Color Bar(MSPG925FA model:217, pattern:65) signal into Component. (MH : component 1 ) 2) Set the PSM to Dynamic mode in the Picture menu 3) Press the INSTART key on R/C for adjustment 4) Press the (Vol. +) key to operate the set, then it becomes automatically 5) Auto-RGB OK means the adjustment is completed 7.3.1 Method of Auto RGB Color Balance 1) Input the PC 1024x768 @ 60Hz with 100% color bar pattern like Fig.4. into RGB. (Ex. MSPG-925FA, model:60, pattern:65) 2) Set the PSM to Dynamic mode in Picture menu 3) Press the INSTART key on R/C for adjustment (Vol. +) key operate To set , then it 4) Press the becomes automatically 5) Auto-RGB OK means adjustment is completed

- 12 -

8. White Balance
* Caution : Before White-balance, the AV ADC should be done. => Notice - Do the white balance adjustment under the 10LUX - Before white balance, press the In-start key 2times and do the reset like Fig.5 - Use the Torino inner pattern(216 gray pattern) - To enter White-balance mode,press the IN-START key 2times. * Caution : - System control RS-232 Host should be "PC" for adjustment.
White Balance(Hex) Color Temp. Red Gain. Green Gain. Blue Gain. Red Offset Green Offset Blue Offset Reset Cool _ To set
(Fig. 4) * Test Equipment LCD : Color Analyzer ( CA-110), PDP : Color Analyzer (CA100) CA-210 : The both of LCD and PDP are available. PC (for communication through RS-232C) -> UART Baud rate : 115200 Pattern Generator (MSPG-925FA etc. ) * Color Temperature & Color Coordinates Setting When adjusting the Color Temperature of LCD, Color AnalyzerCA-210(Matrix should be corrected through CH9 of CS-1000) should be used. When adjusting the Color Temperature of PDP, Color AnalyzerCA-210(Matrix should be corrected through CH10 of CS-1000) should be used. Adjust the Color Temperature based below adjustment color coordinates. Even if CH9 of CA-210 is corrected with Matrix, there may be many character of Module and Filter. Therefore Refer to the below Color Coordinates Target. But, in case of WCG module, use the CH12 of CA-210.

- 13 -

TROUBLESHOOTING

1. No power

Symptom

1) Minute

discharg e doesnt occur at module.
2) Front LED does nt come into ac tion.

Start check

Is inserted a pl ug in power cord? Plug in a power cord YE S NO Connect a cable. Plasma (EL1 1), LC D(SC100 )
Is connected the Line Filter and PSU? YE S
- 14 NO Replace the fuse YE S NO Connect the 13pin cable. YE S
Is normal the fuse of PSU? Plasma (F101), LCD(F111 )
Is it connected tha t PSU and 13 pin cable in VSC board ?
After re mo ve all cab les con nec ted to PSU (except the C N101) , author izes the AC vo ltage marking on manual. W hen ST -b y 5V doesnt operate , replace PSU

2. Protection mode

it doesnt discharge minutely from module.

1) After once shining,

2) The relay fall s. ( The sound is audible "Click ")
3) It is converted w ith the c o lor where the front LED is red fro m gr een.
Is the PSU no rmal? NO Replace the power board YE S NO After connecting we ll each connector the normality it operates? Replace the power board
Is output the no rmality Lo w/High Voltage except Stand-by 5V?
Is the each connector norma l? YE S NO Is no rmal the fuse (FS2 ,FS3 ) on Y-B/D? NO YE S
- 15 YE S NO YE S YE S Is no rmal the fuse (FS1 ,FS2 ) on Z-B/D? NO NO Is normal the output vo ltage after re move P100,110,200, 210 connector of X- B/D?
Is t he Y- Board no rmal ?
Is no rmal the output voltage after remove P1 connector of Y-B/D?

Replace Y-B/D

Replace the fuse
Is the Z - Board no rmal ?
Is no rmal the output vo ltage after remove P1 connector of Z-B/D? Replace the fuse

Replace Z -B/D

Is t he X- Board no rmal ?
After remove P100,110 output voltage normality: Re place Ri ght X-B/ D Afte r re mo ve P200,210 output voltage normality: Replace Left X- B/D

3. No Raster

Sy mptom the front LED is green
1) No OSD and image occur at screen.
2) It maintains the condition where
Does minute discharge at Module? NO NO YE S YE S Check the PDP/LCD Module
Is the inverter/ VaV s on?
Is output the normality Lo w/High Voltage except Stand-by 5V?

Replace the power board

- 16 NO Reconnect the link cable in P600 YE S NO Replace the VSC
Is the link cable normal?
Is the IC700s output normal?
4. In case of becomes unusual display from RF mode(Main)
NO Is the Tuner Cable connected well? Is normal the Input voltage ? (Check Pin8, Pin6) YE S YES Is normal the I2C communication ? (Check Pin5, Pin4)
Is normal video output of the Tuner? (Check TU200_Pin14) NO NO NO
YE S Cable inserts well. Check the power Change the Tuner
Is normal the Input voltage ? (Check L308) YE S Is normal the I2C communication ? (Check R309, R310) NO NO
Is normal video NO output of CXA2069Q? (Check R324, In case of S-Video check R324, R328)
- 17 Check the power ( Check L1004) NO Cable inserts well

Change the IC(IC300)

Is the LVDS Cable connected well?

Change the IC(IC700)

5. In the case of becomes unusual display from rear AV mode(main)
Is normal video input of the A/V jack? Check the input source

Same as Block A

6. In the case of becomes unusual display from rear S-Video mode(main)

Check the input source

Is normal video input of the A/V jack?

- 18 NO

7. In the case of becomes unusual display from side AV mode(main)
8. In the case of becomes unusual display from side S-Video mode(main)
Is normal video input of the A/V jack? (Check R339, R341, L310)

- 19 -

13. In case of becomes unusual display from RF mode(Sub)
Is the Tuner Cable connected well? (Check Pin5, Pin4) Is normal the Input voltage ? (Check Pin8, Pin6)
Is normal video output of the Tuner? (Check TU201_Pin14)
YES Is normal the I2C communication ?
Cable inserts well. Check the power ( L1103)

Change the Tuner

Is normal the Input voltage ? (Check L308)
Is normal video output of CXA2069Q? YES (Check R312, In case of S-Video check R312, R314)
Is normal the I2C communication ? (Check R309, R310)
Check the power ( Check L1004)

- 20 NO

Cable inserts well
14. In case PIP doesnt display from other modes(Sub)
Same as the case of main exc ept block A should be change to B
15. In case of becomes unusual display from component1 mode(main/sub)
Is normal video input of the JK102? (Check L126, L127, L128)

Change IC(IC700)

16. In case of becomes unusual display from component 2 mode(main/sub)
Is normal video input of the JK103? (Check L129, L130, L131)

- 21 NO

17. In case of becomes unusual display from RGB mode(main/sub)
Is normal R, G, B input and H,V sync of the JK500? (Check R509, R511, R512 R513, R515)

18. No Sound

LED is Green
Sc reen i s ex istent, but sound isnt

Ch eck f ollow

All input (mode) is no sound? NO YES NO
Is the speaker on in menu?

Set on speaker in menu

Only HDMI is no Sound? Download the EDID data NO YES
Is the speaker cable normal?

Check the Speaker cable

Only AV input is no Sound? Replace IC300 NO NO YES
Is the output of IC300(pin52,53) normal?
IC400 operate normally? YES

Replace IC400 NO

- 22 Check the signal after IC300 refer to circuit diagram Check the Tuner In/Out NO
IC401 operate normally? YES

Replace IC401 NO

Only RF is no Sound?
IC402 operate normally? YES

Replace IC402 NO

Replace VSC B/D

19. HDMI mode

Yes Down load EDID data each port.

Is normal on ly video ?

No Yes
Is normal on ly audio? No
Check TMDS line wave. (R1215 ~ R1222/ R1226 ~ R1233)
1. Check TV input mode. (HDMI1 port support HDMI and DVI. So if you inpu t D VI signal and PC audio from phone jac k, You can hear PC audio. ) 2. Unplug and plug HDMI ca ble. (sometimes ESD surge occurred at HDMI port.) 3. Check HDMI Mute re gister. (0x 68, offset 0x 37) 4. Check Audio- ou t channe l mute reg ister (0x68 , offse t 0x32) is appropriately enabled.

Is wave continuous?

Check HDMI source. Change another so urce or cab le.
- 23 Yes Normal video , Normal aud io? No Replace IC1200
1. Check H DMI rece ivers status register. ( 0x60, offset 0x06) - If the value is 0xf or 0x 8, it is normal.
2. Check HDCP reg iste r. (0 x60, offset 0x32 ) - Enabl e bit 6: HDCP key loaded - Enable bit 5: HDCP decryption active - Enable bit 4: HDCP authen. attempted
Reset TMDS power down /on register. - 0x60, of fse t 0x 3f : 0xf 7 => 0xff

20.1 DVR

Sympto m

L ED is Green

Doesnt work timeshift m ode.
Cant enter to recorded list
Cant record AV/RF/Component
Is Timeshift Mode "On" in Menu?
NO Change Timeshift Mode from off to "On"
YE S NO Connect a cable. P1300, P1302
Is connected cable? (P1300, P1302 )
- 24 NO Replace the IC1300, IC1302 NO Replace the IC1500, IC1501 YE S Change HDD
Is operated IC 1300,IC1302 normally?
Is operated IC1500, IC1501 normally?

BLOCK DIAGRAM

- 25 -

EXPLODED VIEW

- 26 -

EXPLODED VIEW PARTS LIST

900 910

PART NO.

EAB37526301 EAB39506401 EAJ38817501 ABJ32993205 ACQ33924404 EBR39358301 EBR39358901 EAM35501401 EBR39358101 EBT39358001 EBR38805302 EBU39334801 MJH37063702 MGJ32902414 MJH34248206 MGJ32902715 MGJ32902507 MGJ32902812 MGJ32902910 MGJ38974302 MJH34000506 MGJ38733402 AAN32993604 ABA32985002

DESCRIPTION

Speaker,Full Range, C103A02K1400 ND 7W 8OHM 81DB 160HZ 122 Speaker Assembly, 42LB9RT-MD.KWZZLJZ LGEAZ ASSEMBLE PHANTOM TWEETER LCD,Module-TFT, LC420WX8-SLA1 WXGA 42INCH 1366X768 500CD COLOR 72% 16/9 1000:1(basic) 5ms(GTG) Zero RT Pol. 10000K Vitiaz 2 LG PHILIPS LCD Cabinet Assembly, 42LB9RT-MD LP7BA 42" H4_ANALOG_DVR CABINET ASSEMBLY_FULL_CKD Cover Assembly,Rear, 42LB9RT-MD lP7BA 42" 42"_H4_ANALOG_DVR_BACK COVER ASSEMBLY_FULL_CKD PCB Assembly, SUB T.T LP7BB 42LB9RT-MD KWZZLJZ PREAMP CKD BOM FOR LGEAZ PCB Assembly, CONTROL T.T LP7BB 42LB9RT-MD KWZZLJZ LOCAL KEY CKD BOM FOR LGEAZ Filter,AC Line, IF3-N06CEWL1 5.3mH 250VAC 6A 0.22uF 1000pF UL/CSA/VDE/K HOUSING/RING BK DONG IL TECHNOLOGY LTD. PCB Assembly, SUB T.T LP7BB 42LB9RT-MD KWZZLJZ SIDE A/V TOTAL CKD ASSY FOR LGEAZ Chassis Assembly, SUB LP7BA 42LB9RT-MD CKD HDD ASSY For LGEAZ PCB Assembly,Power, POWER T.T LP78A 42LC4R-MD KWZYLJZ Vitiaz2 PPB POWER CKD_NS 42LC4R-MD Main Total Assembly, 42LB9RT-MD BRAND LP7BB CKD BOM for LGEAZ Supporter, PRESS EGI 1t Supporter EGI LGEAZ_FULL_CKD_METAL TOP BAR Plate, PRESS EGI 1.6 FRAME SBHG-A 42LB9_METAL BAR BOTTOM FULL_CKD FOR LPL MODULE (FULL_CKD OF P/NO 13) Supporter, PRESS EGI 1.2 GUIDE EGI METAL BAR LEFT FOR TORNADO MODULE, FULL CKD , WITHOUT PEMNUT LGEAZ Plate, PRESS EGI 1.2 FRAME SBHG-A 42LB9RT-MD_LGEAZ_FULL_CKD_ METAL BAR CENTER 13-FULL_CKD Plate, PRESS, EGI 1.2 FRAME SBHG-A 42LY3 METAL BAR RIGHT for AZ CKD W/O PAM_NUT Plate, PRESS, EGI 1.2 FRAME SBHG-A 42LB9RT-MD_LGEAZ METAL BAR SIDE TOP(FULL_CKD OF P/N 01) Plate, PRESS, EGI 1.2 FRAME SBHG-A 42LB9RT-MD LGEAZ METAL BAR SIDE BOTTOM FULL_CKD OF P/NO "01" Plate,Metal, PRESS SBHG 1.2T SUPPORTER EGI 42LB9 SUB TOP PIECE PRESS Supporter, PRESS EGI 1.6 GUIDE EGI 42LB9RT-MD METAL STAND SUPPORTER FULL_CKD OF P/NO "03" Plate,Metal, PRESS EGI 1.0 SUPPORTER SECC 47LB9 STAND GUIDE PRESS Base Assembly, STAND 42LB9RT-MD LP7BA STAND BASE ASSY FOR NOBLE BLACK DECO RING FULLCKD_PHNATOM Bracket Assembly, STAND 32LB9D-UA LA73A 32LB9 CABLE MANEGEMENT CKD

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LOC. NO. R906 R907 R908 R909 R910 R911 R912 R914 R915 R916 R917 R919 R920 R923 R934 R935 R936 R937 R938 R939 R940 R941 R942 R943 R944 R945 R946 R947 R948 R949 R952 TH301 R100 R101 R116 R222 R223 R224 R225 R226 R227 R406 R407 R414 R415 R508 R510 R516 R120 R512 R615 R627
PART NO. 0RJ0000D677 0RJ0000D677 0RJ0000C678 0RJ0000C678 0RJ0222C678 0RJ0222D677 0RJ0222D677 0RJ0000D677 0RJ0000D677 0RJ0000D677 0RJ0000C678 0RJ1202D677 0RJ1302D677 0RJ2700C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ0682C678 0RJ2700C678 0RJ1002E472 0RKZVTA001D 0RKZVTA001N EBC01377802 0RS0102K619 0RS0102K619 0RS3900K619 0RS3900K619 0RS2201K607 0RS0102K619 EBC01285802 EBC01285802 EBC01285802 EBC01285802 0RX0221J609 EBC01414102 0RX4702K607 EBC36677701 EBC36677501 EBC36681701 EBC36681701
DESCRIPTION / SPECIFICATION "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 "Resistor,Chip" MCR01MZPJ220 22OHM 5% "Resistor,Chip" MCR03EZPJ220 22OHM 5% "Resistor,Chip" MCR03EZPJ220 22OHM 5% "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 "Resistor,Chip" MCR03EZPJ000 0OHM 5% 1 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 "Resistor,Chip" MCR03EZPJ123 12KOHM 5% "Resistor,Chip" MCR03EZPJ133 13KOHM 5% "Resistor,Chip" MCR01MZPJ271 270OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ680 68OHM 5% "Resistor,Chip" MCR01MZPJ271 270OHM 5% "Resistor,Chip" MCR10EZHF103 10KOHM 1% "Resistor,Metal Film" RN-92T1J10M0 10MOHM 5% "Resistor,Metal Film" MGR0U2J0754A40 750KOHM "Resistor,Metal Oxide Film" MOR03SJ0393BMF 39KOHM "Resistor,Metal Oxide Film" SML02R0J10R0 10OHM 5% "Resistor,Metal Oxide Film" SML02R0J10R0 10OHM 5% "Resistor,Metal Oxide Film" SML02R0J390R 390OHM 5% "Resistor,Metal Oxide Film" SML02R0J390R 390OHM 5% "Resistor,Metal Oxide Film" RSD02T3J2K20 2.2KOHM 5 "Resistor,Metal Oxide Film" SML02R0J10R0 10OHM 5% "Resistor,Metal Oxide Film" MOR02SJ0680A1P 68OHM 5 "Resistor,Metal Oxide Film" MOR02SJ0680A1P 68OHM 5 "Resistor,Metal Oxide Film" MOR02SJ0680A1P 68OHM 5 "Resistor,Metal Oxide Film" MOR02SJ0680A1P 68OHM 5 "Resistor,Metal Oxide Film" RSD01T1J2R20 2.2OHM 5% "Resistor,Metal Oxide Film" MOR0S2J0220A50 22OHM 5 "Resistor,Metal Oxide Film" RSD02T3J47K0 47KOHM 5% "Resistor,Wire Wound" KNP02SJ033KA1P 0.33OHM "Resistor,Wire Wound" KNP01SJ068KA1P 0.68OHM "Resistor,Wire Wound" KNP02SJ090LA10 0.11OHM "Resistor,Wire Wound" KNP02SJ090LA10 0.11OHM

LOC. NO. X1300 X1301 X1303 X1500 X400 X401 X501 X700 P101 P102 P701 P702 F100 F700 O1 J101 JK1200 JK1201 JK501 JK102 JK103 JK104 JK105 JK400 LD1003 LD1104 LD1301 LD1302 D101 PC130 PC150 PC200 PC500 IC1306 IC900 IC506 SW101 SW102 SW103 SW104 SW105 SW106 SW107 SW108 SW1300 SW700 SW900 TH600 TH601 T701 T702 T101 T501 TU200 TU201
PART NO. 6212AB2872A 6212AB2883A EAW39040101 6212AB2883A 6202VDT002H 6202VDT002H EAW39040101 6212AB2015J 430-858C 430-858C 430-858C 430-858C 0FS8001B53B 0FZZTTH001B EAZ39110001 6612J10033A 6612B00015B 6612B00015B 6612F00099A 6612J10031A 6612J10031A 6612J10003Y 6612J10003M 6612J10043A 0DL233309AC 0DL233309AC 0DL233309AC 0DL233309AC 0DLBE0138AA EAV32556601 EAV32556601 EAV32556601 EAV32556601 SAA31073303 SAA31073109 EBD38015101 140-313B 140-313B 140-313B 140-313B 140-313B 140-313B 140-313B 140-313B 6600VR1004A 6600VR1004A 6600VR1004A EBG36689101 EBG36689101 EBJ39717003 EBJ36780101 EBJ36781401 EBJ36781801 EBL35311205 EBL35311209
DESCRIPTION / SPECIFICATION Crystal HC49SM 25MHZ 50PPM 20p Crystal HC-49SM 27.00000MHZ 27 Crystal 9H03200584 32.768KHZ 2 Crystal HC-49SM 27.00000MHZ 27 Crystal SX-1 18.432MHZ 30PPM(1 Crystal SX-1 18.432MHZ 30PPM(1 Crystal 9H03200584 32.768KHZ 2 Crystal HC-49SM 19.66080HZ 19. Fuse Holder 250V 10A 5x4.5mm T/REE Fuse Holder 250V 10A 5x4.5mm T/REE Fuse Holder 250V 10A 5x4.5mm T/REE Fuse Holder 250V 10A 5x4.5mm T/REE "Fuse,Time Delay" 215008 CERAMIC 250V 8A "Fuse,Time Delay" 0215 005(SEMKO/VDE) CE HDD HD081GJ 3.5INCH 80.0GB "Jack,Complex" PMJ016-13 13P DIN/RCA "Jack,DIN" DC1R019WDH SOCKET 21P "Jack,DIN" DC1R019WDH SOCKET 21P "Jack,Phone" PEJ024-01 1P 4P STRAIG "Jack,RCA" PPJ209-02 14.0MM 1RX5C "Jack,RCA" PPJ209-02 14.0MM 1RX5C "Jack,RCA" PPJ216-01 14.0MM 1RX3C "Jack,RCA" PPJ206-01 14.0MM 1RX3C "Jack,RCA" PPJ200-07 15MM 1RX4C A "LED,Chip" SAM2333 RED/Y-GREEN 2. "LED,Chip" SAM2333 RED/Y-GREEN 2. "LED,Chip" SAM2333 RED/Y-GREEN 2. "LED,Chip" SAM2333 RED/Y-GREEN 2. "LED,DIP" BL-BUBGE301 ROUND 3MM "Photo,Coupler" PS2571L1-1-V-A 6V 40V "Photo,Coupler" PS2571L1-1-V-A 6V 40V "Photo,Coupler" PS2571L1-1-V-A 6V 40V "Photo,Coupler" PS2571L1-1-V-A 6V 40V "S/W,Firmware" 3.07 7B70 EUROPE FLASH "S/W,Firmware" 3.EUROPE FLASH "Sensor,Temperature" MM3286CFBE 0.3~3.6 SOP "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" KPT-1115AM 1C1P 12VDC "Switch,Tact" SKHMPWE010 1C1P 12VDC "Switch,Tact" SKHMPWE010 1C1P 12VDC "Switch,Tact" SKHMPWE010 1C1P 12VDC "Thermistor,NTC" 15D2-15 15OHM 20% 275V "Thermistor,NTC" 15D2-15 15OHM 20% 275V "Transformer,high voltage" 2130KP0179B-F UU"Transformer,Linear" 2130KK0081A-F UU1116S "Transformer,Switching" 2130KP0171A-F EER3124N "Transformer,Switching" 2130KP0174A-F EE2525W "Tuner,Tuner/Modulator" TAUT-H001F NTSC 55.25M "Tuner,Tuner/Modulator" TAFT-H004P NTSC 55.25M