LG 42LB7DF Page 21 Service Manual Download | Manualshive

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LGE Internal Use Only

Copyright©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

Check P800, P801 All

Voltage Level (19V, 12V, 6V, 3.3V)

Check Power connector

OK ?

Replace Power board

Y

NY

Check IC804 #2 Pin / L805

Voltage Level 3.3V

Replace IC804 / L805 &

Recheck

Y

N

Check IC803 #5 Pin / L807

Voltage Level 2.6V

Replace IC803 or L807 &

Recheck

Y

N

Check C830, C853, C856

Voltage Level 1.2V

Replace IC802 or IC805 &

Recheck

Y

N

Check X200 Clock

54MHz

Replace X200

Y

N

Check R154 Clock

33MHz

Maybe BCM3553 has troubles.

Y

N

Replace IC101 Flash Memory

N

N

N

Check

Micom

IC407

Redownload

or replace

TROUBLESHOOTING

1. Power-Up Boot Fail

1-2. Troubleshooting

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Summary of Contents for 42LB7DF

Page 1: ...LCD TV SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LJ81A MODEL 42LB7DF 42LB7DF SB website http biz LGservice com Internal Use Only ...

Page 2: ...right 2007 LG Electronics Inc All right reserved Only for training and service purposes CONTENTS CONTENTS 2 PRODUCT SAFETY 3 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 12 TROUBLE SHOOTING 20 BLOCK DIAGRAM 48 EXPLODED VIEW 54 SVC SHEET ...

Page 3: ...fe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna term...

Page 4: ...e 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 charg...

Page 5: ... 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 repla...

Page 6: ... 5 The receiver must be operated for about 20 minutes prior to the adjustment 3 Test method 3 1 Performance LGE TV test method followed 3 2 Demanded other specification Safety UL CSA IEC Specification EMC FCC ICES IEC Chassis LJ81A 42LB7DF SB Central and South AMEROCA LG Model Name Market Brand Remark Model Name 42LB7DF SB Central and South AMEROCA Safety IEC EN60065 EMC CISPR13 Market Appliance R...

Page 7: ...DCR Test Condition HDMI Input 85 Full white pattern 5 Chroma Brightness 6 Component Video Input Y CB PB CR PR Typ 0 03 Typ 0 03 720 480 720 480 720 480 720 480 1280 720 1280 720 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 1920 1080 15 73 15 73 31 47 31 47 45 00 44 96 33 75 33 72 67 500 67 432 27 000 26 97 33 75 33 71 56 25 28 125 60 59 94 60 59 94 60 0...

Page 8: ...56 56 25 36 00 VESA SVGA O 7 800 600 37 879 60 31 40 00 VESA SVGA O 8 800 600 48 077 72 18 50 00 VESA SVGA O 9 800 600 46 875 75 00 49 50 VESA SVGA O 10 1024 768 48 363 60 00 65 00 VESA XGA O 11 1024 768 56 476 70 06 75 00 VESA XGA O 12 1024 768 60 023 75 02 78 75 VESA XGA O 13 1280 768 47 776 59 870 79 5 CVT WXGA O 14 1280 768 60 289 74 893 102 25 CVT WXGA O 15 1360 768 47 712 60 015 85 50 VESA W...

Page 9: ... O 13 1280 768 47 776 59 870 79 5 CVT WXGA O 14 1360 768 47 712 60 015 85 50 VESA WXGA O 15 1280 1024 63 981 60 020 108 00 VESA SXGA O 16 1280 1024 79 976 75 025 135 VESA SXGA O 17 1600 1200 75 00 60 00 162 VESA UXGA O 18 1920 1080 67 5 60 148 5 HDTV 1080P O DTV 1 720 480 31 47 60 27 027 SDTV 480P 2 720 480 31 47 59 94 27 00 SDTV 480P 3 1280 720 45 00 60 00 74 25 HDTV 720P 4 1280 720 44 96 59 94 7...

Page 10: ...ower Consumption 168 36 Watt 9 Weight 11 Typ 12 Max kg 10 Display Operating Mode Transmissive mode normally black 11 Surface Treatment Hard coating 3H 10 Electro Optical Characteristic Specifications module standard No Item Min Typ Max Unit Remark 1 Contrast Ratio CR 800 1000 CR with DCR 2 Surface Luminance White 400 500 Cd m2 Full white 3 Luminance Variation 1 3 white 5P 4 Response Time Gray to G...

Page 11: ...re is setting user mode XD Auto Advanced Cinema Off Reset 6 Audio Audio Language Off EZ SoundRite Off EZ Sound Normal Balance 0 Treble 50 Bass 50 Front Surround Off TV Speaker On 7 Timer Auto clock Off Manual Clock Off Off Timer Off On Timer Off Auto Off Off 8 Option Aspect Ratio 16 9 Caption Text Off Caption Option Off Language English ISM Method Normal SET ID 1 9 Lock Lock System Off Set passwor...

Page 12: ...1 Press the POWER ON KEY on R C for adjustment 2 Press ADJ button of Service remocon Select 10 Test pattern and after select White using navigation button and then you can see 100 Full White pattern 3 In this status you can maintain Heat Run useless any pattern generator Notice If you maintain one picture over 20minute Especially sharp distinction black with white pattern 13Ch or Cross hatch patte...

Page 13: ... between pin centers is 0 1 inch Dimensions are shown in incles Top View Side View 0 100 0 100 0 025 Sq 0 235 Pin 1 2 3 4 5 6 7 8 9 10 Singal Name DCLK GND CONF_DONE VCC nCONFIG nSTATUS DATA0 GND Table2 ByteBlasterMV Female Plug s Pin Names Download Models PS Mode JTAG Mode Description Clock singnal Signal ground Configuration control Power supply Configuration control No connect Configuration sta...

Page 14: ...em a driver must be installed before using the ByteBlasterMV cable go to the ByteBlasterMV and MasterBlaster Installation section in the Quartus II 3 Open the Quartus II programmer by selecting Open Programmer from the Processing Menu Choose Setup in the Programming Hardware section Specify the ByteBlasterMV cable and the appropriate LPT port Please see Changing Setup under the ByteBlasterMV cable...

Page 15: ...Adjustment success 4 Error Messages When its adjustment is not correct ADC Component1 480i Fail message displayed If component is not connection Component1 Not Connected its format is not 480i then Not Valid Format its signal don t out then Check Signal Status message displayed These messages will be displayed just a second 2 ADC 1080p Component1 RGB adjustment Check connection both of Component1 ...

Page 16: ...ecording EDID data write and read 3 D sub jack 4 Additional HDMI cable connection Jig 2 Preparing and setting 1 Set instruments and Jig Like pic 5 then turn on PC and Jig 2 Operate DDC write S W EDID write read 3 It will operate in the DOS mode 6 3 EDID data Model name LG TV 1 HDMI 1 EDID table 2 HDMI 2 EDID table 3 HDMI 3 EDID table 4 Analog RGB EDID table See Working Guide if you want more infor...

Page 17: ...0 00 Start Auto adjustment of white balance Wb 00 10 Start Gain adjustment Inner pattern Jb 00 c0 Wb 00 1f End of Adjustment If it needs offset adjustment wb 00 20 Start wb 00 2f End Wb 00 ff End of white balance adjustment Inner pattern disappear Notice Adjustment Mapping information When Color temperature White balance Adjustment Automatically 1 Press Power only key of service remocon and operat...

Page 18: ...ot allowed Korean model It is selection of Country about Rating and Time Zone 1 Models All models which use LA75A Chassis See the first page 2 Press In Start button of Service Remocon then enter the Option Menu with PIP CH Button 3 Select one of these three USA CANADA MEXICO defends on its market using Vol button 8 GND and ESD Testing 8 1 Prepare GND and ESD Testing Check the connection between se...

Page 19: ...ng and service purposes Input Mode Volume Level Mute Aspect Ratio Picture Picture Mode User1 Back Light Contrast Bright Sharpness Color Tint Color Temperature Picture Reset Audio Sound Mode Auto Volume Clear Voice Front Surrround Balance TV Speaker Time Clock Off Timer On Timer Sleep Timer Auto Off Option Language Menu Audio SimpLink Key Lock Caption Set ID Channel Memory 1 2 3 4 5 6 7 8 9 TV02CH ...

Page 20: ...90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Par...

Page 21: ... Pin L805 Voltage Level 3 3V Replace IC804 L805 Recheck Y N Check IC803 5 Pin L807 Voltage Level 2 6V Replace IC803 or L807 Recheck Y N Check C830 C853 C856 Voltage Level 1 2V Replace IC802 or IC805 Recheck Y N Check X200 Clock 54MHz Replace X200 Y N Check R154 Clock 33MHz Maybe BCM3553 has troubles Y N Replace IC101 Flash Memory N N N Check Micom IC407 Redownload or replace TROUBLESHOOTING 1 Powe...

Page 22: ...ner TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI I...

Page 23: ... D901 Pin 1 Voltage Level 12V Check Power connector Replace Power board Check P903 33 TXAC 32 TXAC 17 TXBC 16 TXBC Maybe BCM3553 has problems Check LVDS Cable Check PDP LCD Module Control board Y N Y Y N Check L901 Voltage Level 12V Replace L901 Y N Y Replace Cable N TROUBLESHOOTING 2 Power Up Boot Fail 2 2 Troubleshooting ...

Page 24: ...C90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Pa...

Page 25: ...BCM7412 Clock Hsync Vsync R1088 T yp 74 25MHz R1087 R1086 Y Y N Check Tuner 5V Power IC810 3 Pin Replace IC810 Y N Y Maybe BCM3553 IC100 has problems N Maybe BCM7412 IC1000 has problems N Check PLD Clock Hsync Vsync R1102 T yp 74 25MHz R1100 R1101 Y Redownload PLD file or replace N Maybe BCM3553 IC100 has problems Y Check D805 color Bad Tuner Replace Tuner None red Check BCM7412 Input Clock R107 2...

Page 26: ...TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 P...

Page 27: ...ck RF Cable Check CVBS signal TU800 17 Pin Maybe Tuner TU800 has problems Check CVBS signal IC808 8 Pin Check CVBS signal C658 Y Y N Check Tuner 5V Power IC810 3 Pin Replace it Y N Y Replace IC808 or check L800 5V power N Replace it N Y Maybe BCM3553 IC100 has problems TROUBLESHOOTING 4 Analog TV Video 4 2 Troubleshooting ...

Page 28: ...TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 P...

Page 29: ...purposes Check signal format Is it supported Check signal L700 L701 L702 L704 L705 L706 Replace it Check signal C638 C639 C640 C628 C629 C630 Y Y N Check J700 J702 Replace connector Y N Y Replace it N Maybe BCM3553 IC100 has problems Y Check Component Cable TROUBLESHOOTING 5 Component Video 5 2 Troubleshooting ...

Page 30: ...er TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB...

Page 31: ...orted Check signal Hsync Vsync C745 C746 C747 R839 R843 Replace it Check signal R727 R714 R729 Y Y N Check P701 Replace connector Y N Y Replace it N Maybe BCM3553 IC100 has problems Check L708 Voltage Level 9V Y Replace L708 Q701 Q702 Q703 N Check Signal C635 C636 C637 Y Replace it N Check RGB Cable Y TROUBLESHOOTING 6 RGB Video 6 2 Troubleshooting ...

Page 32: ...er TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB...

Page 33: ... R755 Composite R814 R815 S Video Rear R855 Composite R856 R857 S Video Side Replace it Check signal C651 Composite C648 C649 S Video Rear C652 Composite C659 C660 S Video Rear Y N Check J701 Rear Check P700 Cable Side Replace connector Y N Y Replace it N Maybe BCM3553 IC100 has problems Y Check AV Cable S Video Cable Y TROUBLESHOOTING 7 AV Video 7 2 Troubleshooting ...

Page 34: ...r TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0...

Page 35: ...or Y N Y Check HDMI Cable Check EDID NVRAM IC602 603 604 Power I2C Signal 5 6 Replace it or redownload Y N Check HDCP Key NVRAM IC102 Power I2C Signal 5 6 Replace it Y N Check IC809 2 Pin Voltage Level 3 3V Replace it Y N Check L607 Voltage Level 3 3V Replace it Y N Check IC601 Clock Signal 26 27 Replace it Y N Maybe BCM3553 IC100 has problems TROUBLESHOOTING 8 HDMI Video 8 2 Troubleshooting ...

Page 36: ...C90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Pa...

Page 37: ... L504 L505 Replace it Check Signal L508 L509 L510 L511 Y N Check IC501 Power 19V 3 3V 1 8V L500 L501 L502 L503 Replace L Y N Y Replace it N Check Connector P500 Y Check BCM3553 I2S Output R627 R628 R629 Y Replace it N Replace connector N Check speaker Y Replace speaker N Maybe NTP3000 has problems Replace it Y TROUBLESHOOTING 9 All Source Video 9 2 Troubleshooting ...

Page 38: ...90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Par...

Page 39: ... Only for training and service purposes Check video output Follow procedure All source audio trouble shooting Y Follow procedure digital TV video trouble shooting N N Maybe BCM3553 internal audio DSP has problems Replace it TROUBLESHOOTING 10 Digital TV Audio 10 2 Troubleshooting ...

Page 40: ...C90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Pa...

Page 41: ...low procedure All source audio trouble shooting Y Follow procedure analog TV video trouble shooting N N Maybe BCM3553 audio block has problems Replace it Check L801 voltage level 5V Replace it N Y Check SIF signal C801 C806 Q800 Replace it N Y Check SIF signal R726 C665 Replace it N Y TROUBLESHOOTING 11 Analog TV Video 11 2 Troubleshooting ...

Page 42: ...12 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 Parse2...

Page 43: ...ar C729 R858 C728 R859 AV Side Replace it N Y Check IC500 power L512 voltage level 9V Replace it N Y Check signal R532 R533 C555 R568 C563 R582 Replace it or IC500 N Y Check IC503 power L513 voltage level 9V Replace it N Y Check signal C554 R569 R581 C562 Replace it or IC503 N Y Check IC502 power L514 voltage level 3 3V L515 voltage level 5V Replace it N Y Check IC502 power L514 voltage level 3 3V...

Page 44: ... TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI IB0 ...

Page 45: ...purposes Check video output Follow procedure All source audio trouble shooting Y Follow procedure HDMI video trouble shooting N N Maybe BCM3553 audio block has problems Replace it Check EDID NVRAM IC602 603 604 Power I2C Signal 5 6 Replace it or redownload Y N TROUBLESHOOTING 13 HDMI Audio 13 2 Troubleshooting ...

Page 46: ...uner TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 PKT HSX PCI EBI HD DVI ...

Page 47: ...ck L205 voltage level 5V Y N Replace it or IC202 Check P201 Replace it Y N Check USB Device If device is 2 5 inch HDD check power adaptor Y Maybe BCM3553 has problems Y Exception USB power could be disabled by inrushing current In this case remove the device and try to reboot the TV AC power off on TROUBLESHOOTING 14 USB 14 2 Troubleshooting ...

Page 48: ...ecoder Analog Digital Tuner TC90512 DVI I2S SIF SPDIF Out CVBS CVBS Y C Y Cb Cr R G B DDR1 64MB CS5340 L R Serial TP 20bits 12bit YC 4 2 2 NIM TUNER TMDS_RX EPM240F MNT out Audio Only TMDS341A 3x1 S W CVBS Y C MC33078 AMP L R RS232 RX TX DVI 4 2 2 20bit YC Full HD 1080P WXGA 768P RF Switch DM1 DP1 Serial TP 74HC04 SPDIF Out Coaxial Video Front End Dual HDMI Rx HD SD Video Encoder Audio DSP USB2 0 ...

Page 49: ...Low Active High BCM3553 Active Low Flash Tuner PLD Reset Design 54M Crystal BCM3553 33MHz BCM7412 Main Clock 27MHz Clock is Recovered From The STC Values BCM3553 BCM7412 VCXO 27M Clock Design BCM3553 3 3V CH 0 NIM TUNER 0xC2 0x30 5V Audio Switch 0x9A CH 1 3 3V HDCP Key EEPROM 0xA8 CH 2 3 3V Micom 0x50 CH 3 NVRAM 0xA6 Audio AMP 0x54 I2C Design BLOCK DIAGRAM ...

Page 50: ...d BCM7412 Recommends the following power up sequence 1 2V 2 5V 3 3V Recommends no more than 5ms between different supplies All Voltages should regulate at their nominal output voltages no later than 10ms So Power up is Controlled by Micom These 3 voltages should ramp up within 20ms total in any order no sequence required supplying 1 2V 2 6V 3 3V simultaneously is meet our requirement too D3 3V D1 ...

Page 51: ...d service purposes Power Up Sequence 2 Result Initially 1 2V 2 6V 3 3V ramp up in 10ms Spec within 20ms e Actually Reset time is approximately 100ms considering the variation of R C after power on Spec after 75ms 1 Power Sequence measurement waveform D1 2_BCM D2 6_BCM D3 3_BCM BCM_Reset BLOCK DIAGRAM ...

Page 52: ...29 Composite 1 Auto Detect Input COMPOSITE1_SW 26 Composite 2 Auto Detect Input COMPOSITE2_SW 24 Board Revision 1 Input REV_SEL1 17 Board Revision 0 Input REV_SEL0 16 Component 2 Auto Detect Input COMP2_SW 15 Component 1 Auto Detect Input COMP1_SW 14 HDMI 2 Hot Plug Detect Output HDMI_HPD_2 11 HDMI 1 Hot Plug Detect Output HDMI_HPD_1 10 HDMI 0 Hot Plug Detect Output HDMI_HPD_0 9 HDMI 2 Power Detec...

Page 53: ...MEMO 53 LGE Internal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 54: ...nternal Use Only Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes 300 200 810 813 120 500 510 900 910 550 530 540 520 400 815 816 812 814 817 811 120 121 EXPLODED VIEW ...

Page 55: ...S AB16 CPLD_TD I AB15 BCM7411_DVI_OUT 0 19 10 BA22 GN D BCM7411_DVI_CL K 10 BB24 CPLD_TD I I15 CPLD_TD O AB16 BCM7411_DVI_VSYNC 2 1 A3 BCM7411_DVI_HSYNC 2 1 A3 SYS_RESET b 1 D 6 2 B 3 4 B 6 8 A 3 CPLD_TC K I15 BCM7411_DVI_VSYN C 10 BB24 BCM7411_DVI_CLK2 1 A4 BCM7411_DVI_DE 2 1 A4 THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATE S SPECIAL FEATURES IMPORTANT FOR PRO TECTION FROM X RADIATION FIL...

Page 56: ... 31 DDR0_M_Data 25 DDR0_M_Data 27 DDR0_M_Data 28 DDR0_M_Data 30 DDR0_M_Data 39 DDR0_M_Data 37 DDR0_M_Data 34 DDR0_M_Data 32 DDR0_M_Data 36 DDR0_M_Data 47 DDR0_M_Data 41 DDR0_M_Data 43 DDR0_M_Data 44 DDR0_M_Data 46 DDR0_M_Data 55 DDR0_M_Data 53 DDR0_M_Data 50 DDR0_M_Data 48 DDR0_M_Data 52 DDR0_M_Data 63 DDR0_M_Data 62 DDR0_M_Data 60 DDR0_M_Data 57 DDR0_M_Data 59 DDR0_M_Data 6 DDR0_M_Data 3 DDR0_M_D...

Page 57: ...RM_DQ 12 7411_DDRM_DQ 2 7411_ DDRM_A 9 7411_ DDRM_A 2 BCM7411_DVI_OUT 2 7411_ DDRM_DQ 30 7411_DDR_DQ 16 7411_ DDRM_DQ 19 7411_DDR_DQ 4 7411_ DDRM_DQ 11 7411_DDRM_DQ 1 BCM7411_DVI_OUT 1 7411_ DDRM_A 8 7411_ DDRM_A 0 7411_ DDRM_DQ 29 7411_DDR_DQ 15 7411_ DDRM_DQ 19 7411_DDR_DQ 3 7411_DDRM_DQ 1 7411_ DDRM_DQ 10 7411_ DDRM_A 7 7411_ DDRM_A 9 7411_ DDRM_DQ 29 7411_DDR_DQ 14 7411_ DDRM_DQ 14 7411_DDR_DQ...

Page 58: ...Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes MAIN TOP MAIN BOTTOM CONTROL B D TOP CONTROL B D BOTTOM SIDE A V TOP SIDE A V BOTTOM IR LED TOP IR LED BOTTOM PRINTED CIRCUIT BOARD ...

Page 59: ...Dec 2007 Printed in Korea P NO MFL41546701 ...

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