LG RT-42LZ30 Service Manual Download Page 15 | Manualshive

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TROUBLESHOOTING

1. NO POWER

NO POWER

(POWER INDICATOR OFF)

CHECK POWER BOARD

CHECK J601

VOLTAGE

(18V, 12V, 5V)?

NO

CHECK POWER BOARD

CHECK

J602 VOLTAGE

(24V, 33V) ?

NO

CHECK KEY

CONTROL BOARD

YES

YES

YES

CHECK X401

CHECK

X401

(14.318MHz) ?

NO

CHECK MICOM(U402)

SUB POWER PORT(R634)

CHECK

J601

(SUB POWER) ?

NO

1

2

3

4

5

6

7

1

2

3

Waveforms

1

2

3

Waveforms

J601-18V

J601-12V

J601-5V

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Summary of Contents for RT-42LZ30

Page 1: ...D TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS CL 70 MODEL RT 42LZ30 website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...2 SAFETY PRECAUTIONS 3 SVC PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 SVC REMOCON 14 TROUBLE SHOOTING 15 BLOCK DIAGRAM 23 WRING 25 EXPLODED VIEW 26 EXPLODED VIEW PARTS LIST 27 REPLACEMENT PARTS LIST 28 SVC SHEET ...

Page 3: ...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 ...

Page 4: ...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 Altern...

Page 5: ...d 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 th...

Page 6: ...ing CE Standard EN55020 SAFETY Following CB Standard EN55013 SPECIFICATION NOTE Specifications and others are subject to change without notice for improvement 4 General Specification 1 LCD Module Feature Maker LPL Type TFT Color LCD Module Active Display Area 42 02 inches 1067 308mm diagonal Pixel Pitch mm 0 681mm x 0 227mm x RGB Electrical Interface LVDS Color Depth 8bits 16 777 216 colors Size m...

Page 7: ...t Voltage Voltage 100 240Vac 50 or 60Hz Current Rating 5 Inrush Current Cold 40A Hot 40A 6 Operating Condition Sync H V Video LED Wattage Normal On On Active Green 260W Power SW Stand by Off On Off Amber 4W ON Suspend On Off Off Amber 4W DPMS Off Off Off Off Amber 4W Cut off Switch off 3 W 7 MTBF 50 000 HRS with 90 Lamp Life Confidence level 50 000 Hours min 8 Using Altitude 5 000 m for Reliabilit...

Page 8: ...dio Level NTSC Input 0 40 0 1 V rms 600 PAL Input 0 5 0 1 PC Input 0 7 0 1 Video Cross Talk 43 dB 8 Optical Character No Item Criteria Remark 1 Viewing Angle Horizontal R L 85 85 Min 88 88 Typ CR 10 Vertical Top Bottom 85 85 Min 88 88 Typ 2 Luminance Luminance cd m2 400 cd m2 min 500cd m2 Typ 9300K Variation 1 3 3 Contrast Ratio 700 300 min 1000 400 Typ Without AI 4 CIE Color Coordinates Minimum N...

Page 9: ...00K G 9500K G 10 6500K B 9300K B 40 3 1 5 PRESET 3 6500 K color coordinate confirmation The input is Full White Pattern It sends an instruction The AUTO_MODE_CHANGE 0xF2 0x02 and the Setting it does 6500K and checks if the color coordinate probably is the x 313 30 y 329 30 3 2 Color coordinates Adjustment and brightness Adjustment AV input 3 2 1 Color coordinates adjustment provisions Adjusting Ea...

Page 10: ...perates normally and DDC data is written correctly 3 2 5 11 RS 232C Connect serial cable to RS232C It fixes speed of 115200BPS Send the instruction 0x04 0xaa 0xff 0x53 and check OK Message is display on screen 3 2 5 12 All Reset All Tests finish when inside service mode the NVRAM INITIAL makes it ON with Initial Data 3 2 5 13 LANGUAGE The default language is ENGLISH as in the Product Specification...

Page 11: ...attern 6 Amber Suspend Mode 5W Pattern 7 Amber Power Off 5W Pattern 8 Amber 9 Cut off Switch off state 0W Irrespective of mode Irrespective of LED OFF pattern 10 Gray Scale check Linear gray scale MODE 14 Mode 14 Pattern 9 Whole screen 11 SOG COMPOSITE Full Size Mode 03 11 12 It does not co Pattern 5 Whole signal check time Serration check screen 1H OFF SOG signal Pattern 0 The Color 0 0 the condi...

Page 12: ... 600 V Lines 75 0 625 600 1 3 21 8 H Pixels 56 25 53 674 1048 800 32 64 152 800 x 600 V Lines 85 061 631 600 1 3 27 9 H Pixels 57 283 49 725 1152 832 32 64 224 832 x 624 V Lines 74 550 667 624 1 3 39 10 H Pixels 65 0 48 363 1344 1024 24 136 160 1024 x 768 V Lines 60 0 806 768 3 6 29 11 H Pixels 75 00 56 476 1328 1024 24 136 144 1024 x 768 V Lines 70 069 806 768 3 6 29 12 H Pixels 78 75 60 123 1312...

Page 13: ...Else 0 English 24 THILAND 1 1 1 0 0 0 7 0 West EU Else 0 English 24 SINGAPORE 1 1 1 0 0 0 7 0 West EU Else 0 English 24 CHINA 0 1 1 0 1 0 22 0 West EU Chinese 6 chinese 208 AUSTARALIA 1 1 1 0 0 0 7 0 West EU Australia 0 English 8 UAE 1 1 1 0 0 0 7 4 ARAB ENG else 0 English 28 SAUDI 1 1 1 0 0 0 7 4 ARAB ENG else 0 English 28 MALAYSIA 1 1 1 0 0 0 7 0 West EU Else 0 English 24 INDONESIA 1 1 1 0 0 0 7...

Page 14: ...AV To move channel up down or to select a function displayed on the screen To adjust the volume or accurately control a specific function To set a specific function or complete setting To move the channel down in the PIP screen To use as a red key in the teletext mode To move the channel in the PIP screen To use as a green key in the teletext mode To switch between the main and sub screens To use ...

Page 15: ...ECK J601 VOLTAGE 18V 12V 5V NO CHECK POWER BOARD CHECK J602 VOLTAGE 24V 33V NO CHECK KEY CONTROL BOARD YES YES YES CHECK X401 CHECK X401 14 318MHz NO CHECK MICOM U402 SUB POWER PORT R634 CHECK J601 SUB POWER NO 1 2 3 4 5 6 7 1 2 3 Waveforms 1 2 3 Waveforms J601 18V J601 12V J601 5V ...

Page 16: ... 16 4 5 6 7 Waveforms J602 24V J602 12V X401 14 318MHz J601 ...

Page 17: ...AYED NO RASTER OSD IS NOT DISPLAYED CHECK THE PERIPHERAL IC U402 CHECK U402 NO CHECK THE PERIPHERAL J802 CHECK LVDS OUTPUT J802 NO CHECK INVERTER YES YES YES YES CHECK U607 AND THE PERIPHERAL IC U607 CHECK INVERTER POWER J606 J607 NO ...

Page 18: ...K THE PERIPHERAL IC OF GM1501 U402 CHECK UPD64011 U904 I O SIGNAL CHECK MDIN150 U901 AND SDRAM U902 I O SIGNAL CHECK GM1501 U402 AND SDRAM U401 POWER CHECK OF CXA2040 U201 U204 9V POWER CHECK OF UPD64011 U904 U905 3 3V U906 1 5V POWER CHECK OF MDIN150 U901 U907 3 3V U908 2 5V POWER CHECK OF GM1501 U402 NO INPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL ...

Page 19: ...PHERAL IC OF GM1501 U402 CHECK TV CH CHECK UPD64011 U6 I O SIGNAL CHECK MDIN150 U901 AND SDRAM U902 I O SIGNAL CHECK GM1501 U402 AND SDRAM U401 POWER CHECK OF TUNER TU201 L219 33V L220 5V POWER CHECK OF CXA2040 U201 U204 9V POWER CHECK OF UPD64011 U904 U905 3 3V U906 1 5V POWER CHECK OF MDIN150 U901 U907 3 3V U908 2 5V POWER CHECK OF GM1501 U402 NO INPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL NO ...

Page 20: ...CK CONNECTION OF SPEAKER ON MONITOR CHECK SOUND INPUT PC SOUND J707 VIDEO DVD DTV SOUND RED WHITE OF J701 J702 CHECK THE PERIPHERAL IC OF MSP3410G U501 CHECK MSP3410G U501 I O SIGNAL CHECK TPA3004 U502 I O SIGNAL CONNECTOR CHECK POWER CHECK OF MSP3410G U501 U522 8V L501 5V L505 5V POWER CHECK OF TPA3004 U502 C564 18V NO OUTPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL NO INPUT SIGNAL NO INPUT SIGNAL...

Page 21: ...ERAL IC OF GM1501 U402 CHECK THE PERIPHERAL IC OF GM1501 U402 CHECK THE PERIPHERAL IC OF D SUB J101 CHECK ADC I O SIGNAL IN GM1501 U402 CHECK GM1501 U402 I O SIGNAL CHECK LVDS I O SIGNAL POWER CHECK OF GM1501 U402 POWER CHECK OF LVDS OUTPUT J802 NO OUTPUT SIGNAL NO INPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL ...

Page 22: ...CONNECTOR J102 CHECK CHECK THE PERIPHERAL IC OF GM1501 U402 CHECK THE PERIPHERAL IC OF GM1501 U402 CHECK GM1501 U402 I O SIGNAL CHECK LVDS I O SIGNAL POWER CHECK OF GM1501 U402 POWER CHECK OF LVDS OUTPUT J802 NO OUTPUT SIGNAL NO OUTPUT SIGNAL NO INPUT SIGNAL NO INPUT SIGNAL ...

Page 23: ...BLOCK DIAGRAM upD64011 gm1501H 23 ...

Page 24: ...l transmitted from audio decoder The audio signal is amplified according to pre defined DC volume control curve 6 De interlacer This block is composed of MDIN150 U901 and peripheral devices GM1501 U402 controls this IC through IIC Line And this IC convert 16 Bit Interlaced Y UV signal to De interlace signal It output converted signal to Format Converter IC GM1501 U402 7 Format Converter This block...

Page 25: ...WIRING DIAGRAM 25 1 6631T11020M 30PIN 2 6631T20032H 12PIN 3 6631T20013H 5PIN 4 6631T20034K 3PIN 5 6631T20034L 10PIN 6 6631T20033P 11PIN 7 6631T20034J 9PIN ...

Page 26: ... 26 EXPLODED VIEW 010 020 110 111 030 070 090 060 130 120 040 080 180 140 150 160 170 100 050 ...

Page 27: ...2LZ30 H H MODULE 4951TKK192B METAL ASSEMBLY SHIELD 42LZ30 SKD 4950TKK888 6871TPT292B PWB PCB ASSEMBLY POWER 37 42 CHAMELRON CHASSIS PSU POWER TOTAL BRAND KN POWERTEK 3313TP4001C MAIN TOTAL ASSEMBLY RT 42LZ30 BRAND CL 70 3 CHAMELEON 4951TKK193H METAL ASSEMBLY REAR RT 42LZ30 CHAMELEON 4951TKK193J METAL ASSEMBLY REAR RT 42LZ30 CHAMELEON SKD 6401TZZ043E SPEAKER ASSEMBLY RT 42LZ30 20W 8OHM 1080M 4PIN 1...

Page 28: ...CRIPTION SPECIFICATION C401 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C408 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C4101 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C418 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C468 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C469 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C470 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C471 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C472 0CH3104K566 0 1UF 5...

Page 29: ...2 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C973 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C975 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C980 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C981 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C983 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C984 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP C986 0CH3104K566 0 1UF 50V 10 X7R...

Page 30: ...10 R TP X7R C560 0CK152CK51A 1500PF 1608 50V 10 R TP B Y C563 0CH3105H946 1UF 25V 80 20 F Y5V 2012 DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C565 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C566 0CK104CK56A 0 1UF 1608 50V 10 R TP X7R C567 0CK474CH94A 0 47UF 1608 25V 80 20 R T C568 0CK103CK51A 0 01UF 1608 50V 10 R TP B Y C570 0CK474CH94A 0 47UF 1608 25V 80 20 R T C571 0CK474CH94A 0 4...

Page 31: ... 20 R TP SMD S C222 0CE335VK6DC 3 3UF MV 50V 20 R TP SMD S C227 0CE225VK6DC 2 2UF MV 50V 20 R TP SMD S DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION C228 0CE225VK6DC 2 2UF MV 50V 20 R TP SMD S C233 0CE227VF6DC 220UF MV 16V 20 R TP SMD S C238 0CE227VF6DC 220UF MV 16V 20 R TP SMD S C256 0CE475VK6DC 4 7UF MV 50V 20 R TP SMD S C257 0CE107WF6DC 100UF MVK 16V 20 R TP SMD C288 0CH8226F691...

Page 32: ...D323 ZD712 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD713 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD714 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION ZD719 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD720 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD721 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD722 0DZ560009DA UDZ S 5 6B TP ROHM K SOD323 ZD723 0DZ56...

Page 33: ...210TCE001P HB 1S2012 121JT CERATECH 201 L707 6210TCE001P HB 1S2012 121JT CERATECH 201 L712 6210TCE001H HB 1T2012 301JT CERATEC 2012 L713 6210TCE001H HB 1T2012 301JT CERATEC 2012 DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION L801 6210TCE001G HH 1M3216 501 CERATEC 3216MM L802 6210TCE001G HH 1M3216 501 CERATEC 3216MM L1010 6210TCE001S HU 1M2012 121 CERATECH 2012M L1011 6210TCE001S HU ...

Page 34: ...NO DESCRIPTION SPECIFICATION RA804 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA805 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA806 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA807 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA808 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA809 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA810 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM 1 1 RA811 0RHZTCZ001D RCA86TRJ22R0 SMART 22OHM...

Page 35: ... R TP R1055 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R1056 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R1057 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R1058 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R106 0RJ0222D677 22 OHM 1 10 W 5 1608 R TP R1075 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R1077 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R1078 0RJ2202D677 22K OHM ...

Page 36: ... 1608 R TP R434 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R435 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R436 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R437 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R438 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R441 0RJ1002D677 10K OHM 1 10 W 5 1608 R TP R442 0RJ1001D677 1K OHM 1 10 W 5 1608 R TP R443 0RJ4700D677 470 OHM 1 10 ...

Page 37: ... OHM 1 10 W 5 1608 R TP R710 0RJ4703D677 470K OHM 1 10 W 5 1608 R TP R711 0RJ0752D677 75 OHM 1 10 W 5 1608 R TP DATE 2004 12 24 S AL LOC NO PART NO DESCRIPTION SPECIFICATION R712 0RJ0822D677 82 OHM 1 10 W 5 1608 R TP R713 0RJ0752D677 75 OHM 1 10 W 5 1608 R TP R714 0RJ0000D677 0 OHM 1 10 W 5 1608 R TP R715 0RJ0822D677 82 OHM 1 10 W 5 1608 R TP R717 0RJ0752D677 75 OHM 1 10 W 5 1608 R TP R718 0RJ0000...

Page 38: ...566 0 1UF 50V 10 X7R 2012 R TP C5 0CH3104K566 0 1UF 50V 10 X7R 2012 R TP R10 0RH8200D622 820 1 10W 5 D R TP R3 0RH4701D622 4 7K 1 10W 5 D R TP R4 0RH4701D622 4 7K 1 10W 5 D R TP R5 0RH8200D622 820 1 10W 5 D R TP R6 0RH2201D622 2 2K OHM 1 10 W 2012 5 00 R7 0RH1501D622 1 5K OHM 1 10 W 2012 5 00 R8 0RH1501D622 1 5K OHM 1 10 W 2012 5 00 R9 0RH2201D622 2 2K OHM 1 10 W 2012 5 00 C2102 0CH6331K416 330PF ...

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Page 42: ...Dec 2004 Printed in Korea P NO 3828TSL106J ...

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