LG 42LF66 Service Manual
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LG 42LF66 Service Manual

LG 42LF66 Service Manual

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LCD TV

SERVICE MANUAL

CHASSIS : LD75A
MODEL : 42LF66
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
42LF66-ZE

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Summary of Contents for LG 42LF66

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : LD75A MODEL : 42LF66 42LF66-ZE CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS ....................2 SAFETY PRECAUTIONS ................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............15 TROUBLE SHOOTING ................19 BLOCK DIAGRAM...................27 EXPLODED VIEW .................. 29 EXPLODED VIEW PARTS LIST ..............30 REPLACEMENT PARTS LIST ............... 31 SVC. SHEET ....................- 2 -...

  • Page 3: Safety Precautions

    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.

  • Page 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service unit under test. manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or...
  • Page 5 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 Excessive heat applied to the copper foil of any printed circuit circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit should be used to remove and replace the IC.

  • Page 6: Specification

    Aspect Ratio 16:9 LCD Module 37LB5DF (37LF65): LC370WU1-SL01 42LB5DF (42LF65): LC420WU2-SLB1 47LB5DF (47LF65): LC470WU1-SLB2 37LF66: LC370WU1-SL01 42LF66: LC420WU2-SLB1 47LF66: LC470WU1-SLB2 Operating Environment 1) Temp. : 0 ~ 40 deg 2) Humidity : 10 ~ 90% LGE SPEC Storage Environment 3) Temp. : -20 ~ 50 deg...
  • Page 7 5. Chroma & Brightness 5-1. FHD Module-47LF66 Item Unit Measurement Result Remark Viewing Angle Viewing <CR>10> Angle<CR>10> White average - 100IRE Full White Pattern(255gray) 47LF65 cd/m brightness - Picture : Dynamic (Cool) - 100IRE Full White Pattern(255gray) Brightness uniformity cd/m - Picture : Dynamic (Cool) Color White...
  • Page 8 5-2. FHD Module-42LF66 Item Unit Measurement Result Remark Viewing Angle Viewing Angle <CR>10> <CR>10> White average 42LF65 cd/m - 100IRE Full White Pattern (255gray) brightness - Picture : Dynamic (Cool) Brightness uniformity cd/m - 100IRE Full White Pattern (255gray) - Picture : Dynamic (Cool)
  • Page 9 5-3. FHD Module-37LF66 Item Unit Measurement Result Remark Viewing Angle Viewing Angle <CR>10> <CR>10> White average 37LF65 cd/m - 100IRE Full White Pattern (255gray) brightness - Picture : Dynamic (Cool) Brightness uniformity cd/m - 100IRE Full White Pattern (255gray) - Picture : Dynamic (Cool) Color White 0.261...
  • Page 10 6. Component Video Input (Y, P Resolution H-freq(kHz) V-freq.(kHz) Pixel clock(MHz) Proposed 720*480 15.73 59.94 13.500 SDTV, DVD 480I(525I) 720*480 15.75 60.00 13.514 SDTV, DVD 480I(525I) 720*576 15.625 50.00 13.500 SDTV, DVD 576I(625I) 720*480 31.47 59.94 27.000 SDTV 480P 720*480 31.50 60.00 27.027...
  • Page 11 7-1. EDID Input (PC) FF FF FF FF FF FF 1E 6D 72 75 46 27 78 EA D9 B0 A3 57 49 9C 25 20 11 49 4B A5 6E 31 40 45 40 61 40 81 80 90 40 30 D1 C0 1 1A 36 80 A0 70 38 1F 40 30 20 40 35...
  • Page 12 Model Name : 47LF66 / Check Sum HDMI1 : D71D , HDMI2 : D70D Model Name : 42LF66 / Check Sum HDMI1 : DC1D , HDMI2 : DC0D Model Name : 37LF66 / Check Sum HDMI1 : D81D , HDMI2 : D80D...
  • Page 13 Cell pitch 541.5um (H) x 541.5um (V) G cell Color arrangement RGB stripe arrangement Weight(net) Net 1EA 9-2. General specifications-42LF66: LC420WU2-SLB1 Item Unit Remark Display area 930.24 (H) * 523.26 (V) Outline dimension 983 (W) x 576 (H) x 51 (D)
  • Page 14 1144.5 825.6 With Stand After Packing 1230 Product Only SET 37.46 kg With Stand Weight With BOX 44.7 kg 10-2. 42LF66 Item Content Remark Product Width (W) Length (D) Height (H) Dimension Before Packing 1033.1 With Stand After Packing 1119...

  • Page 15: Adjustment Instruction

    This spec. sheet is applied to all of the LD75A chassis 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F manufactured at LG TV Plant all over the world. 00 00 FF FF FF FF FF FF 00 1E 6D Ex.) LD75A : 37/42/47LB5DF-ZC, 37/42/47LY3DF-ZA...
  • Page 16 5. Method of Tool Option setting 3) Press IN-START key on R/C for adjustment. 5.1. Press ADJ Key in the Adjust remocon. 5.2. Select "Tool Option1 and 2" by using (CH+/-) key, and Press Number Key. 5.3. Model Table. Model name Tool Option1 Tool Option2 37LF65...

  • Page 17: White Balance

    3) Press the IN-START key on R/C for adjustment. PC (for communication through RS-232C) -> UART Baud rate : 115200 bps * Connecting picture of the measuring instrument (On Automatic control ) Inside PATTERN is used when W/B is controlled. Connect to auto controller or push control R/C IN-START ->...
  • Page 18 5) When the R/G/B GAIN is 80 on OSD, it is the FULL DYNAMIC Range of the Module. In order to control white balance without the saturation of FULL DYNAMIC Range and DATA, one of R Gain / G Gain / B Gain should be kept on 80, and other two is controlled lowering from 80.

  • Page 19: Troubleshooting

    TROUBLESHOOTING 1. No power (1) Symptom 1) Doesn't minute discharge at module. 2) Non does not come in into the front LED. (2) Check follow Is plug in power cord? Plug in power cord Is connect the Line Connect cable. Filter and Power Board Cable? Is normal the...
  • Page 20 2. Protect mode (1) Symptom 1) After once shining, it does not discharge minutely from module. 2) The relay falls.(The sound is audible “Click”.) 3) It is converted with the color where the front LED is red from green. (2) Check follow Is output the normality Low/High Is normal the Power Replace Power Board.
  • Page 21 3. No Raster (1) Symptom 1) No OSD and image occur at screen. 2) It maintains the condition where the front LED is green (2) Check follow Is output the normality Does minute Replace the Power Is the inverter on? Low/High voltage except discharge board.
  • Page 22 4. In case of occur strange screen into specific mode 1) In case of does't display the OSD (1) Symptom 1) LED is green. 2) The minute discharge continuously becomes accomplished from module (2) Check follow Is normal the LVDS Is the LVDS cable connected well? Replace Power Board.
  • Page 23 2) In case of does't display the screen into specific mode (1) Symptom - The screen does not become the display from specific input mode (RF, AV, Component, RGB, DVI). (2) Check follow (1) Check the all input mode should become normality display. (1) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become normality display from the PIP mode or DW mode.
  • Page 24 (4) In the case of becomes unusual display from side S-video/AV mode Is Video input of the Check the input source. AV Jack (P1400) normal? Is normal the Input voltage, Is normal the Replace IC IICCommunication and HV sync? CXA2069Q? Same as Block A (5) In the case of becomes unusual display from Component, RGB mode Is R,G,B input and...
  • Page 25 (7) In the case of becomes unusual display from SCART1 mode Is Video input Check the input source. of A/V jack normal? (J1200) Same as Block A (8) In the case of becomes unusual display from SCART2 mode Is Video input Check the input source.

  • Page 26: In Case Of No Sound

    5. In case of no sound (1) Symptom 1) LED is green. 2) Screen display but sound is not output (2) Check follow Is the speaker Set on speaker in All input (mode) On it men? menu. is no sound? Is the speaker Check the Speaker Cable normal?

  • Page 27: Block Diagram

    SIDE R R R R C C C C Y Y Y Y / / / / L L L L V V V V SIF/AM_AUDIO TU_MAIN REC8 V,R/L DTV/MNT V,R/LIN SCART TV_VOUT R/LIN & COMP SPDIF_MSP_OUT MAIN_V/Y/C 3.3V R/G/B/FB SCART R/G/B/HV_SYNC LVDS...
  • Page 28 MEMO - 28 -...

  • Page 29: Exploded View

    EXPLODED VIEW - 29 -...

  • Page 30: Exploded View Parts List

    Speaker,Tweeter, EN10D-6714 ND 10W 8OHM 82DB 0HZ 68 X 23 X 22.7 LUG KOREA TOPTONE EAJ37267701 LCD,Module-TFT, LC420WU2-SLB2 FULLHD 42.0INCH 1920X1080 550CD COLOR 72% 16/9 800:1( DCR 5000:1) A-TW Pol. 10000K P7 LG PHILIPS LCD ABJ32247710 Cabinet Assembly, 42LF66-ZE FHD LD75A 42" EUROPASS3_DVB C/SKD (SPK GRILL GLOSSY, SPRAY "A": N.BLOCK) ACQ32247927 Cover Assembly, 42LC7R/55/LF65-ZA LD73A-PHANTOM 42"...

  • Page 31: Replacement Parts List

    PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ACCESSORY C528 0CE227WF6DC "Capacitor,AL,Chip" MVK8.0TP16VC220M 220uF MFL36914902 "Manual,Owners" PRINTING USER PD75A LG C533 0CE107WF6DC "Capacitor,AL,Chip" MVK6.3TP16VC100M 100uF MKJ32022835 Remote Controller COMPLEX LD75A 47LB5DF- C534 0CE227WF6DC "Capacitor,AL,Chip" MVK8.0TP16VC220M 220uF 3550V00590A...
  • Page 32 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0CH3104K566 "Capacitor,Ceramic,Chip" 0805B104K500CT 100nF 1 C1205 0CK103CK56A "Capacitor,Ceramic,Chip" 0603B103K500CT 10nF 10 C100 0CC101CK41A "Capacitor,Ceramic,Chip" C1608C0G1H101JT 100pF C1206 0CK102CK56A "Capacitor,Ceramic,Chip" 0603B102K500CT 1nF 10% C100 0CC101CK41A "Capacitor,Ceramic,Chip" C1608C0G1H101JT 100pF C1207 0CK103CK56A "Capacitor,Ceramic,Chip"...
  • Page 33 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1342 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C1447 0CK474CH94A "Capacitor,Ceramic,Chip" 0603F474Z250CT 470nF - C1346 0CK474CH94A "Capacitor,Ceramic,Chip" 0603F474Z250CT 470nF - C1448 0CK474CH94A "Capacitor,Ceramic,Chip" 0603F474Z250CT 470nF - C1347 0CK474CH94A "Capacitor,Ceramic,Chip"...
  • Page 34 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C184 0CK104CF56A "Capacitor,Ceramic,Chip" 0603B104K160CT 100nF 1 C430 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C185 0CK104CF56A "Capacitor,Ceramic,Chip" 0603B104K160CT 100nF 1 C516 0CK104CF56A "Capacitor,Ceramic,Chip" 0603B104K160CT 100nF 1 C186 0CK104CF56A "Capacitor,Ceramic,Chip"...
  • Page 35 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C715 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C780 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C716 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C781 0CK104CK56A "Capacitor,Ceramic,Chip" 0603B104K500CT 100nF 1 C717 0CK104CK56A "Capacitor,Ceramic,Chip"...
  • Page 36 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C865 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 D104 EAH33945901 "Diode,TVS" CDS3C30GTH 30V 50V 120 C866 0CK104BF56A "Capacitor,Ceramic,Chip" C1005X7R104KET 100nF 1 ZD1100 EAH33946001 "Diode,TVS" CDS3C05GTA 5.6V 6.4V 1 C867 0CK104BF56A "Capacitor,Ceramic,Chip"...
  • Page 37 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC502 0IMCRSJ001B "IC,LDO Voltage Regulator" SC1565IST-2.5TR 2.2TO5 L1412 6210TCE001E "Filter,Bead" HB-1M2012-800JT(H:1mm) IC503 0IPMGKE030A "IC,LDO Voltage Regulator" KIA78R05F 6TO12V 5V 8W L1413 6210TCE001E "Filter,Bead" HB-1M2012-800JT(H:1mm) IC504 0IPMGKE031A "IC,LDO Voltage Regulator"...
  • Page 38 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION L1307 0LCTO00019A "Inductor,Wire Wound,Chip" D75C-646CY-220M=P3 22U AR104 0RJ0472C687 "Resistor,Array" RCA86TRJ47R0 47OHM 5% L600 0LCTA00003A "Inductor,Wire Wound,Chip" LEMC3225T6R8M 6.8UH 20 AR105 0RJ0472C687 "Resistor,Array" RCA86TRJ47R0 47OHM 5% L601 0LCTA00003A "Inductor,Wire Wound,Chip"...
  • Page 39 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R103 0RJ0472D677 "Resistor,Chip" MCR03EZPJ470 47OHM 5% R1119 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% R103 0RJ2002D677 "Resistor,Chip" MCR03EZPJ203. 20KOHM 5 R112 0RJ1002D677 "Resistor,Chip" MCR03EZPJ103 10KOHM 5% R103 0RJ2203D677 "Resistor,Chip"...
  • Page 40 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1215 0RJ1001D477 "Resistor,Chip" MCR03EZPF102 1KOHM 1% R1288 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1 R1216 0RJ1001D477 "Resistor,Chip" MCR03EZPF102 1KOHM 1% R1289 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1 R1219 0RJ0752D677 "Resistor,Chip"...
  • Page 41 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1357 0RJ0122D677 "Resistor,Chip" MCR03EZPJ120 12OHM 5% R1460 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R1358 0RJ0122D677 "Resistor,Chip" MCR03EZPJ120 12OHM 5% R1461 0RJ1000C678 "Resistor,Chip" MCR01MZPJ101 100OHM 5% R1359 0RJ0000D677 "Resistor,Chip"...
  • Page 42 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1728 0RJ0332D677 "Resistor,Chip" MCR03EZPJ330 33OHM 5% R1790 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R1729 0RJ0332D677 "Resistor,Chip" MCR03EZPJ330 33OHM 5% R1791 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R173 0RJ0472D677 "Resistor,Chip"...
  • Page 43 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R230 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R544 0RJ1002D677 "Resistor,Chip" MCR03EZPJ103 10KOHM 5% R231 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R547 0RJ1000D677 "Resistor,Chip" MCR03EZPJ101 100OHM 5% R232 0RJ1000D677 "Resistor,Chip"...
  • Page 44 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R670 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1 R743 0RJ0000C678 "Resistor,Chip" MCR01MZPJ000 0OHM 5% 1 R671 0RH0000D622 "Resistor,Chip" MCR10EZHJ000 0OHM 5% 1 R743 0RJ0222C678 "Resistor,Chip" MCR01MZPJ220 22OHM 5% R672 0RJ0000D677 "Resistor,Chip"...
  • Page 45 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R810 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% R933 0RJ1001D677 "Resistor,Chip" MCR03EZPJ102 1KOHM 5% R811 0RJ0222D677 "Resistor,Chip" MCR03EZPJ220 22OHM 5% R934 0RJ1002D677 "Resistor,Chip" MCR03EZPJ103 10KOHM 5% R812 0RJ1002D677 "Resistor,Chip"...
  • Page 46 LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION EAD36184801 "Harness,Single" SMH250 SMH250 400MM 2. EAD36608901 "Harness,Single" SMH200-12P SMH200-12PL 6631900010N "Harness,Single" 12P 2.0MM 900MM SMH200 6631900012C "Harness,Single" SMH250 SMH250 200mM 2. 6631900027C "Harness,Single" SMH250 SMH250 200mM 2. 6631900049D "Harness,Single"...
  • Page 47 SIi5100 Decoupling Capacitors R242 LDA[10] 1.2V 002:C3;002:G4 LD_A[10] DDR TERMINATION OPTIONs AR200 L102 1/16W HH-1M3216-501 C166 002:C3;002:G5 LD_A[3] LDA[3] 10uF LDA[2] 1.2VA 002:C3;002:G4 LD_A[2] 1.2V 002:C2;002:G4 LD_A[1] LDA[1] LDA[0] 002:C2;002:G4 LD_A[0] DDR Termination Power AR201 1/16W R201 2.5V 1V25 002:G3;002:J2 LD_D[0] 002:C3;002:H4 LD_A[7]...
  • Page 48 [POWER BLOCK] TDFC-G106P TU600 C612 C616 0.1uF 47uF 5V_TU 5.0V For only C.I. 3.3 volt % MUST BE PLACED NEAR IC100 IC600 GND_TU Over current protection can be operated TPS2010ADR IC504 5V_ANN_MNT 5.0V R652 KIA78R33F OUT4 TPS2010 IC507 OUT3 KIA78R05F GND_TU R653 OUT2...
  • Page 49 FOR LCD STAND_BY 1W 5V_HDMI_0 +5VST IC1002 R1018 +5VST AT24C02BN-10SU-1.8 R911-*1 R913-*1 R915-*1 R916-*1 R917-*1 R918-*1 R919-*1 R920-*1 C1007 0.1uF R915 KDS184 +5VST R1017 HDMI 5V Detection D1000 R1019 R923 R923-*1 R924-*1 R925-*1 R926-*1 R930-*1 R932-*1 R933-*1 R934-*1 R1039 R919 5V_HDMI_0 R1021 Q901...
  • Page 50 C1320 0.47uF TP1302 TP1306 TP1308 +9V_MSP4450 TP1304 TP1301 TP1303 TP1305 TP1307 C1341 3.3uF R1305 R1304 L1302 HH-1M3216-501 TP1356 ZD1300 RLZ8.2B-TE11 C1343 100uF +5V_MSP4450 L1301 C1313 R1303 HH-1M3216-501 22uF 40 CAPL_M 1.5K 65 AVSUP0 +9V_MSP4450 R1300 39 AHVSUP 66 AVSUP1 C1318 38 CAPL_A 56pF 67 ANA_IN1+...
  • Page 51 Apr., 2007 P/NO : MFL36631016 Printed in Korea...

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