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LG DM5420K, Service Manual

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LG DM5420K Service Manual Download Page 23

 3-6

ELECTRICAL TROUBLESHOOTING GUIDE

Tape abnormal

Does sled motor move?

Connector check CN105 pin10 VCC(9 V).

YES

YES

NO

Check the signal input of IC112 pin2, 15.

Check power supply circuit (Q2A5).

NO

NO

NO

Check the signal output 

of CN105 pin3, 4.

Check tape part circuit.

Check R2B1, R2B2 normal?

Replace the tape part.

Normal

Check Q2A3, Q2A4 circuit.

Check CN105 connection wire.

Normal

NO

NO

NO

NO

YES

YES

Summary of Contents for DM5420K

Page 1: ...E MANUAL MODEL DM5420K DM5420K DMS5420V CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL DM5420K DM5420K DMS5420V SERVICE MANUAL P NO AFN75814472 JULY 2012 Website http biz lgservice com Internal Use Only ...

Page 2: ...CONTENTS SECTION 1 SUMMARY SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 REPLACEMENT PARTS LIST 1 1 ...

Page 3: ...1 SUMMARY CONTENTS SERVICING PRECAUTIONS 1 3 ESD PRECAUTIONS 1 5 SERVICE INFORMATION FOR EEPROM 1 6 PROGRAM UPDATE GUIDE 1 7 1 HOW TO UPDATE MICOM PROGRAM 2 HOW TO UPDATE DVD ESS PROGRAM SPECIFICATIONS 1 9 1 2 ...

Page 4: ...the eyes Absolutely never permit laser beams to enter the eyes Also NEVER switch ON the power to the laser output part lens etc of the pick up if it is damaged 5 Cleaning the lens surface If there is dust on the lens surface the dust should be cleaned away by using an air bush such as used for camera lens The lens is held by a delicate spring When cleaning the lens surface therefore a cot ton swab...

Page 5: ...eplacing a component part first disconnect the power supply lead wire from the unit 2 All equipment measuring instruments and tools must be grounded 3 The workbench should be covered with a conductive sheet and grounded When removing the laser pick up from its conductive bag do not place the pick up on the bag This is because there is the possibility of damage by static electricity 4 To prevent AC...

Page 6: ... damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive materia...

Page 7: ... POWER ON Completed DVD Setup Display 16 9 mode Press Set Remote control 1 3 9 7 1 3 9 Enter Key Press POWER key TV Display INFORMATION FOR EEPROM DVD or USB MODE TV Display NO DISC status Press Set Remote control SETUP Key Select 16 9 ...

Page 8: ...root folder of USB storage 3 Put the USB into the set Change set function to USB function Then the upgrade process will be started with the upgrade intormation TV Display UPDATING 4 If the upgrade process is complete the set will be rebooted with COMPLETED message and set auto power off 5 Pull out the USB storage Press the power key PROGRAM UPDATE GUIDE ...

Page 9: ...py the file to the root folder of USB storage 3 Put the USB into the set Change set function to USB function Then the upgrade process will be started with the upgrade intormation TV display UPDATING 4 If the upgrade process is complete the set will be rebooted with COMPLETED message and set manual power off 5 Pull out the USB storage Press the power key ...

Page 10: ...x 2 TUNER FM Tuning Range 87 5 to 108 0 MHz or 87 50 to 108 00 MHz AMPLIFIER Output Power Front 55 W x 2 4 Ω T H D 15 Frequency Response 45 Hz to 20 kHz Signal to noise ratio 75 dB DVD CD PLAYER Frequency response audio 100 Hz to 18 kHz Signal to noise ratio audio More than 75 dB 1 kHz Signal to noise ratio video More than 55 dB 1 kHz Dynamic range audio More than 80 dB USB USB Version USB 2 0 or ...

Page 11: ...1 10 MEMO ...

Page 12: ...SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 CABINET AND MAIN FRAME SECTION DM5420K 2 3 2 PACKING ACCESSORY SECTION 2 7 3 SPEAKER SECTION 2 8 2 1 ...

Page 13: ...2 2 MEMO ...

Page 14: ...3 252 276 275 A26 273 A46 272 462 462 457 A47 455 455 268 458 456 455 457 457 456 456 456 458 271 CABLE1 A41L A41R 296 295 USB MIC C D A48 A56 460 459 267 267 A41A 260 263 250 261L 261R 262L 264L 265L 265R 262R 264R KEY NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE ...

Page 15: ...2 5 2 6 MEMO MEMO ...

Page 16: ... PACKING ACCESSORY SECTION 803T Packing 803B Packing 804 Bag 802 Box 900 Remote Control 832 Blank Disk 808 Battery 801S Song Book 811 Video Cable 827 Microphone 801 Instruction Ass y 825 FM Wire Antenna 0 ON ...

Page 17: ...2 8 A60R A60L 3 SPEAKER SECTION FRONT SPEAKER DMS5420V ...

Page 18: ... 16 7 RF WAVEFORM ANALOG SCOPE 3 16 WIRING DIAGRAM 3 17 BLOCK DIAGRAM 3 19 CIRCUIT DIAGRAMS 3 21 1 SMPS CIRCUIT DIAGRAM 3 21 2 DVD MPEG ADC COMPOSITE USB CIRCUIT DIAGRAM 3 23 3 S3050 S8082 MIC CIRCUIT DIAGRAM 3 25 4 DSP SPBANA HEADPHONE CIRCUIT DIAGRAM 3 27 5 AMPLIFIER CIRCUIT DIAGRAM 3 29 6 MCU TUNER AUX CIRCUIT DIAGRAM 3 31 7 VFD KEY LED CIRCUIT DIAGRAM 3 33 8 TAPE CIRCUIT DIAGRAM OPTIONAL PART ...

Page 19: ...omal BD901 nomal D941 nomal TH901 nomal Is VCC 9V 25V supplied to IC901 pin4 Replace F901 Use same type fuse Replace BD901 Replace D941 Replace ZD908 Replace TH901 Q904 nomal Check or replace Q904 YES YES NO YES YES NO YES NO NO NO NO NO 1 SMPS PART ...

Page 20: ...omal TH901 nomal D959 nomal Is VCC 9V 25V supplied to IC902 Pin5 Replace F901 Use same type fuse Replace BD901 Replace ZD902 Replace IC957 Power line of main PCB is short Replace TH901 Replace D959 D907 nomal Check or replace D907 YES YES NO NO YES YES YES NO YES NO NO NO NO NO NO NO ...

Page 21: ...heck IC701 VDD IC701 pin26 27 32 35 40 41 of power circuit Check the speakers connection Check the signal output of L701 L702 L703 L704 Replace L701 L702 L703 L704 R708 R710 R711 R712 nomal Check IC701 pin2 4 voltage 3 3 V Replace R708 R710 R711 R712 Replace IC701 Check the power circuit NO NO YES NO NO NO YES YES YES NO YES 2 AUDIO ABNORMAL ...

Page 22: ...ircuit L401 L402 L403 R416 R417 R418 R435 C430 C431 Check the signal input JK101 pin1 3 Normal NO NO Tuner abnormal Check the signal output of TU400 pin1 2 Check TU400 VCC normal Check the signal input of IC112 pin1 12 Check R400 R401 R402 R403 C402 C403 Check TU500 pin4 TU_CK pin5 TU_DA pin7 TU_RST Normal Check the VCC power circuit NO NO NO YES YES YES YES ...

Page 23: ...n10 VCC 9 V YES YES NO Check the signal input of IC112 pin2 15 Check power supply circuit Q2A5 NO NO NO Check the signal output of CN105 pin3 4 Check tape part circuit Check R2B1 R2B2 normal Replace the tape part Normal Check Q2A3 Q2A4 circuit Check CN105 connection wire Normal NO NO NO NO YES YES ...

Page 24: ... on CD Check Open Close Check READING display Check reading OK Check connector CN801 Check connector CN800 Check connector CN800 Check pick up movement Check IC800 S3053 IC100 ES8390 Replace IC800 IC100 OK YES YES YES NO YES NO NO NO 4 CD PART ...

Page 25: ...ective pick up or IC800 IC100 Defective pick up or Q804 Q805 circuit Defective pick up or IC800 IC100 Defective pick up or IC800 IC100 Check IC800 or IC100 VCC normal Replace IC100 Check IC100 signal pin44 SPI_CS3 pin46 SPI_DI Replace IC102 Normal Check IC100 pin105 XOUT pin106 XIN signal Does sled motor move Does the laser move Does laser light Does spindle motor rotate NO NO NO NO NO NO NO NO NO...

Page 26: ...Check signal CN108 pin3 4 D D Check IC100 Check power supply circuit USB 5 V Check IC100 pin90 91 D D OK Check IC105 circuit Normal Check CHECKING or USB display Check reading OK If play check audio output NO NO NO NO YES Turn on USB YES YES YES YES 6 USB PART ...

Page 27: ...lace FB308 L300 Normal IC300 normal Check IC300 signal pin1 VFD CLK pin3 VFD DATA pin4 VFD STB Check CN300 pin8 YES YES NO YES YES VFD display check YES NO NO NO 7 VFD DISPLAY CHECK Check resistor FB304 FB305 FB306 Check CN300 flat film wire Replace FB304 FB305 FB306 Check CN300 signal pin13 VFD_CLK pin14 VFD_DATA pin12 VFD_STB YES YES NO ...

Page 28: ...TC WAVEFORM 1 2 3 4 RESET DVD IC100 PIN72 SPI_CS3 FLASH IC102 PIN1 SPI_DI IC102 PIN2 SPI_DO IC100 PIN47 5 6 7 USB_5V USB_P IC100 PIN90 USB_N IC100 PIN91 2 WHEN USB FUNCTION OPERATING USB PLAYING 3 11 WAVEFORMS OF MAJOR CHECK POINT ...

Page 29: ...3 STARTING ACTION WAVEFORM IN MD DEVICE SLED HOME 8 9 10 SLD IC800 PIN4 SLED IC800 PIN12 SLED IC800 PIN11 AT POWER ON 3 12 ...

Page 30: ... TE IC100 PIN120 FOD IC100 PIN148 14 FE IC100 PIN121 INSERT CD 4 1 FOCUS WAVEFORM IN CASE OF CD 4 2 FOCUS WAVEFORM IN CASE OF CD RW 12 PI IC100 PIN123 11 TE IC100 PIN120 13 FOD IC100 PIN148 14 FE IC100 PIN121 INSERT CD RW 3 13 ...

Page 31: ... OF DVD 11 TE IC100 PIN120 12 PI IC100 PIN123 13 FOD IC100 PIN148 14 FE IC100 PIN121 INSERT DVD 11 TE IC100 PIN120 12 PI IC100 PIN123 13 FOD IC100 PIN148 14 FE IC100 PIN121 4 4 FOCUS WAVEFORM IN CASE OF DVD RW INSERT DVD RW 3 14 ...

Page 32: ... DIRECTION 15 SPNN IC100 PIN131 16 SPNP IC100 PIN132 17 DMO IC100 PIN147 18 TE IC100 PIN120 5 2 WHEN WE PUSH OPEN OR STOP KEY SPINDLE BREAK SIGNAL SPNN SPNP BE USED SPINDLE BREAK DIRECTION 15 SPNN IC100 PIN131 16 SPNP IC100 PIN132 17 DMO IC100 PIN147 18 TE IC100 PIN120 3 15 ...

Page 33: ...19 A CN800 PIN11 20 B CN800 PIN14 21 C CN800 PIN13 22 D CN800 PIN12 6 AT FIRST ACTION FOCUS SIGNAL A B C D 23 RF IC100 PIN136 7 RF WAVEFORM ANALOG SCOPE 3 16 ...

Page 34: ... 18 CN303 CN302 CN301 CN304 PN300 PN301 CN800 CN801 CN902 CN901 CN602 CN108 CN101 CN103 CN102 CN601 CN109 23P MAIN MD KEY TOP SMPS MIC USB KEY L FRONT KEY R 16P 3P 8P 15P 2P 4P 24P 7P 4P CN300 WIRING DIAGRAM ...

Page 35: ...jrGGtljohupzt MOTOR DRIVE IC S3053 DMA 0 11 DB 0 15 DSCK CKE CS0 RAS0 SPI_CS CLK DI KO IR USBDP USBDM AUX IN POWER USB MCU LC87F5NC8A PWM AMP TAS5342LA mkGk w ZY POWER CON IR TAPE pu L R L R L R 9 IIC IIC IIC SPI PWM R L Component Y Pb Pr Video 5V 22V VEE F F 12V 6 2V G khiGt A D WM8738 L R MIC MIC AMP S4308 j p jk W Y PS9831 S8082 TURD TURD N N HP OUT MC4580 AMP MC4580 L R PWM HP L R ...

Page 36: ...M5420 DM5320 STR W6753 DM5620 5520 EBJ4934901 DM5420 5320 6170RNGW25C 0 1 2SWLRQ IC Option IC901 P 2SWLRQ DM5320 22V 0 5W 9 1 9 0 9 1 DM5320 16 4V 5A 2SWLRQ 39 2 DM5420 22V 5A DM5420 5320 D909 UF4007 DM5620 5520 D909 HER207 2SWLRQ 2SWLRQ 1ǃDM5420 DM5320 LF901 LF902 SQE2424S 2ǃDM5620 DM5520 LF901 LF902 SQE2828 2 DM5620 5520 SFAF2004G 20A 200V 2 2SWLRQ 1 DM5420 5320 SFAF1004G 10A 200V DIODE Option D...

Page 37: ...04 R138 390 1 C129 104 C180 104 C181 104 C176 104 C177 104 R139 1 5K R141 10k R151 FB600 C173 100P C174 330P C175 103 C172 104 C171 104 R152 100R R153 100R R154 100R C170 330P R155 10R FB117 FB600 C169 104 R156 FB600 R157 0R R158 NC C168 104 R159 NC R160 33R R161 33R R162 33R R163 FB272 C166 100P R165 33R R166 33R R167 470R R164 33R C165 104 C164 104 C163 104 C162 104 C161 104 R184 10R R185 FB120 ...

Page 38: ...0R C832 100P C833 100P ZD900 3V3 0 5W R863 1R C835 104 C834 104 FB805 FB252 FB806 FB220 FB807 FB220 1 NF 2 GND 3 INPUT 4 OUTPUT 5 ALC 6 VCC IC600 S4308 1 2 3 4 5 6 7 JK601 1 2 3 4 5 6 7 JK602 R608 22k R610 22k R612 100k R613 100k R609 56k R611 56k R607 10k C606 104 FB603 FB600 FB604 FB600 FB602 FB600 C607 NC R606 100k R602 1k R601 47k C602 NC R605 220R R604 1M C603 104 FB601 FB600 R603 220R C1J7 1...

Page 39: ...1D3 104 R1E4 1k2 R1E6 10k R1E5 10k R1F4 100R R1F3 100R C1D4 104 R1E7 10k R1E8 10k R1F1 10k R1F2 10k C1E4 104 C1D5 104 C1D6 103 R1F5 1k R1F7 0R R1F6 NC C1D7 103 R1H9 15k R1H3 10k R1H5 10k R1H6 10k R1H4 10k R1H7 15k R1H8 15k R1G1 15k C1F3 330P C1F5 330P C1F6 22P C1F7 22P C1F8 330P C1F9 330P C1F0 22P C1G0 22P C1F4 100P C1G1 100P C1G3 4 7uF C1G4 4 7uF C1G5 4 7uF C1G6 4 7uF R1G2 6k8 R1G3 6k8 R1G4 6k8 R...

Page 40: ..._B 2 OTW 3 NC1 4 NC4 5 SD 6 PWM_A 7 RESET_AB 8 PWM_B 9 OC_ADJ 10 GND 11 AGND 12 VREG 13 M3 14 M2 15 M1 16 PWM_C 17 RESET_CD 18 PWM_D 19 NC2 20 NC3 21 VDD 22 GVDD_C 44 GVDD_A 43 BST_A 42 NC6 41 PVDD A 40 PVDD_A 39 OUT_A 38 GND_A 37 GND_B 36 OUT_B 35 PVDD_B 34 BST_B 33 BST_C 32 PVDD_C 31 OUT_C 30 GND_C 29 GND_D 28 OUT_D 27 PVDD D 26 PVDD_D 25 NC5 24 BST_D 23 GVDD_D IC702 IC TAS5352 DDV C750 333 C751...

Page 41: ...3 C415 103 C419 103 C423 103 C412 103 C416 103 R419 100R R420 100R R421 100R R422 100R R423 100R R424 100R R425 100R R426 100R R427 100R R428 100R R429 100R R430 100R R431 100R R432 100R R433 100R R434 100R C404 100P C405 100P C409 100P C413 100P C417 100P C421 100P C425 100P C408 100P C468 100P C469 100P C420 100P C424 100P C427 100P C406 100P C410 100P C414 100P C418 100P C422 100P C426 100P C42...

Page 42: ...G17 27 SG18 28 SG19 29 SG20 30 SG21 31 SG22 32 SG23 33 SG24 34 GR1 35 GR2 36 GR3 37 GR4 38 GR5 39 GR6 40 GR7 41 GR8 42 GR9 43 GR10 44 GR11 45 GR12 46 GR13 47 GR14 48 GR15 49 GR16 50 VEE 51 VDD2 52 GND2 IC300 PT6324 R317 1k R318 1k R319 100k R320 100k R321 82k C306 100P C308 100P C310 100P C304 104 C309 104 C303 104 R315 100k C305 104 L300 10uH A B 1 2 3 VR301 V G S IR301 C314 104 C315 100P R325 33...

Page 43: ...50V R227 100R R227 100R R225 5 6K R225 5 6K R209 1M R209 1M C229 47uF 16V C229 47uF 16V C217 100pF C217 100pF C238 10uF 50V C238 10uF 50V C202 222pF M C202 222pF M Q204 3904 NC Q204 3904 NC 1 3 2 C221 220pF C221 220pF C240 2 2uF 50V C240 2 2uF 50V C236 4 7uF 50V C236 4 7uF 50V R237 220R R237 220R R204 1K R204 1K C212 100pF C212 100pF R251 0R R251 0R R208 10K R208 10K R247 2 2K NC R247 2 2K NC FB21...

Page 44: ...70uF 16V 4 9V 0V C932 330uF 16V 0V 11 8V C934 47uF 50V 0V 21 9V C935 47uF 50V 0V 26 2V C945 1000uF 16V 6 3V 0V C946 1uF 50V 27 1V 2 4V C947 10uF 50V 6 3V 0V C948 330uF 16V 0V 21 9V C949 100uF 16V 3 4V 0V C950 2200uF 50V 22V 0V C951 2200uF 50V 22V 0V C965 1000uF 16V 4 4V 0V C970 1000uF 25V 13 3V 0V C971 100uF 50V 0V 28 6V C976 1000uF 16V 4 3V 0V C977 1uF 50V 4 9V 2 4V C978 100uF 16V 4 9V 0V C979 10...

Page 45: ...MIC_IN 0V 6 12V 12V 7 MIC_SENS 5 3V Location No Pin No Voltage CN804 16PIN 1 GND 0V 2 P 12V 11 92V 3 P 12V 12V 4 GND 0V 5 P 5V 5V 6 GND 0V 7 CD 5V 4 98V 8 USB 6 3V 9 IP 6 3V 10 PWM 3V3 3 47V 11 PGND 0V 12 PGND 0V 13 PVDD 16 5V 14 PVDD 16 5V 15 PVDD 16 5V Location No Pin No Voltage CN800 23PIN 1 HFM_VCC 4 89V 2 RF_OUT 0V 3 LD_VDD 0V 4 MD_DVD 0V 5 VR_DVD 0V 6 GND_PD 0V 7 VREF 2 07V 8 VCC 4 98V 9 F 1...

Page 46: ...3 41 3 42 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD ...

Page 47: ...3 43 3 44 2 MAIN P C BOARD TOP VIEW ...

Page 48: ...3 45 3 46 MAIN P C BOARD BOTTOM VIEW ...

Page 49: ...4 KEY_L P C BOARD 5 KEY_R P C BOARD 3 VFD USB P C BOARD 3 47 3 48 ...

Page 50: ...7 KEY_TOP P C BOARD 6 MIC P C BOARD 3 49 3 50 ...

Page 51: ...3 51 3 52 MEMO MEMO ...

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