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LG MAX220UB, Service Manual

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LG MAX220UB Service Manual Download Page 16

 2-7

3. DISPLAY ERROR CORRECTION FLOW CHART

No Display or Some Display is broken?

Something wrong with the Display?

OK

YES

IC901(56)

YES

NO

Checked the LCD

Driver Vdd?

YES

IC901(60)

NO

Checked the LCD

Driver Ground?

YES

IC901(57), IC401(29)

NO

Checked the LCD

Driver RESET?

YES

IC901(61)

NO

Checked the LCD

Driver OSC?

YES

IC401(23, 24, 25, 29),
CN402(9, 10, 16, 18),
IC901(57, 62, 63, 64)

NO

Checked the LCD

Driver data interface?

YES

IC901(1~55),

LCD, Check the short

NO

Checked the LCD to

LCD Driver line?

Summary of Contents for MAX220UB

Page 1: ...MARCH 2012 DIGITAL MEDIA RECEIVER SERVICE MANUAL MODEL MAX220UB CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only MODEL MAX220UB SERVICE MANUAL ...

Page 2: ...ON FLOW CHART 2 8 5 USB ERROR CORRECTION FLOW CHART 2 9 6 AUX ERROR CORRECTION FLOW CHART 2 11 WAVEFORMS 2 12 CIRCUIT VOLTAGE CHART 2 13 INTERNAL BLOCK DIAGRAM OF ICs 2 14 1 IC601 BD3702FV 2 14 2 IC801 LV5693P 2 15 3 IC804 TB2931HQ 2 17 WIRING DIAGRAM 2 19 BLOCK DIAGRAMS 2 21 1 MAIN BLOCK DIAGRAM 2 21 2 FRONT BLOCK DIAGRAM 2 23 3 ELECTRICAL BLOCK DIAGRAM 2 25 CIRCUIT DIAGRAMS 2 27 1 MAIN_1 CIRCUIT...

Page 3: ...he test instrument positive lead Always remove the test instrument ground lead last 1 The service precautions are indicated or printed on the cabinet chassis or components When servicing follow the printed or indicated service precautions and service materials 2 The Components used in the unit have a specified conflammability and dielectric strength When replacing any components use components whi...

Page 4: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD de vices 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 comparab...

Page 5: ...ange 520 to 1720 kHz or 522 to 1620 kHz S N Ratio 50 dB Distortion 1 0 Usable Sensitivity 28 dBμV AUX Frequency Response 20 Hz to 20 kHz S N Ratio 80 dB Distortion 0 1 Channel Separation 1 kHz 45 dB Max Input Level 1 kHz 1 1 V USB Version USB 1 1 or USB 2 0 Full Speed Bus Power Supply USB DC 5 V 1 5 A Line OUT Optional Frequency Response 20 Hz to 20 kHz Output Voltage 2 V Max Subwoofer Optional Fr...

Page 6: ... drive TA Optional Searches stations that have TA TP information when it is pressed and held F Remote Sensor Optional G Display window H USB port I Returns to the previous step J Skip Search Seek Tune K MENU Activates setting menu FUNC In each mode sets playback items L Moves to the previous or next preset station in TUNER Moves 10 MP3 WMA files backward or forward if there is no folder or one fol...

Page 7: ...or 5 seconds then It goes to the version display mode 3 Push BAND Key until the LCD displays OPTION OPTN XYZ The XYZ means the Option Code 2 How to change the option code 1 The Input mode can be set by press the volume knob the first digit will be blinking until the new code is set 2 The number what you want to input could be selected by spinning the volume knob clockwise or counterclockwise And t...

Page 8: ...Program reading Insert update USB in ACC on state and then is displayed in order USB USB Check MN CD DNLD 3 Upgrade start In order to start upgrade Press Play Pause Key until CHECKING Display on the LCD 4 Upgrade progress display Upgrade is in progress now CD Download CHECKING ERASE WRITE I VRF D VRF MN Download CHECKING WRITE DOWN OK 5 Upgrade Completion When Upgrade finished the display shows up...

Page 9: ...cted to the audio set via its shapes matched each other We need power supply for operation of audio set Voltage 10 16 V Current Over 20 A Before connection between set and power supply adjust voltage level to 16 V typically It is okay up to 10 V Power Supply has a variety of shapes and capacity of voltage and current At first check these things HOW TO CONNECT AUDIO SET TO POWER SUPPLY ...

Page 10: ...d GND Checked the Regulator Back up VDD Checked the Main Micom VDD Checked the Main Micom GND Checked the Main Micom X tal Checked the Main Micom reset Checked the ACC in Checked the Front Panel Key input IC801 15 14 IC401 14 40 55 89 Checked the Main Micom B Detect IC401 11 39 56 88 X401 X402 IC401 8 IC402 Q802 R459 IC401 3 IC401 15 16 CN402 7 8 1A 1B 1C 1D 1E IC401 4 21 YES YES YES YES YES YES Y...

Page 11: ... Sense line 1A Not available to Volume control OK YES EV901 IC401 6 68 CN402 14 15 YES NO Checked the Encoder volume YES IC401 31 32 IC601 25 26 NO Checked the Volume IC control 1B Not available to Key control OK YES SW901 SW907 SW909 SW912 YES NO Checked the Tact switch YES IC401 15 16 CN402 7 8 NO Checked the Key line 1C OPTIONAL ...

Page 12: ...o ANT Motor Type control OK YES D808 IC801 6 11 IC401 94 NO Checked the ANT control YES 1D Not available to Remote External AMP control OK YES JK801 9 IC401 84 Q811 Q812 Q813 NO Checked the Remote control YES 1E OPTIONAL ...

Page 13: ...601 15 IC401 98 YES NO Checked the E VR Mute control IC601 1 2 3 4 5 6 7 9 18 19 20 21 22 23 YES YES NO Checked the E VR Signal in out IC804 1 2 8 13 18 24 YES NO Checked the Power IC GND IC804 6 20 NO Checked the Power IC VDD IC804 4 22 IC401 85 87 YES NO Checked the Power IC control IC804 3 5 7 9 11 12 14 15 17 19 21 23 YES NO Checked the Power IC Signal in out JK801 11 12 13 14 15 16 17 18 YES ...

Page 14: ...ntorl YES 2A No Sound External AMP OK YES IC601 18 19 20 21 22 23 NO Checked the Line Out signal YES Q601 Q602 Q603 Q604 Q607 NO Checked the Line Out AMP Mute control YES JK601 NO Checked the Line Out AMP signal in out YES 2B No output Beep sound OK YES YES IC401 30 IC601 14 NO Checked the Beep control 2C OPTIONAL ...

Page 15: ...oldering all the pin of IC Prevent crack of solder line Keep changed IC We request that you send it to HQ Stand by Power Sound Voltage ON OFF OFF 0 to 1 0 OFF ON ON 2 2 to VCC Mute Sound Voltage ON OFF 0 to 1 0 OFF ON 2 2 to VCC Picture 1 Power IC desc 5 V 1 10 6 20 VCC1 VCC2 TAB Ripple C2 B C3 C5 9 Out1 11 C1 8 7 PW GND1 Out1 IN1 5 Out2 12 C1 2 3 PW GND2 Out2 IN2 17 Out3 15 18 19 PW GND3 Out3 IN3...

Page 16: ...ecked the LCD Driver Vdd YES IC901 60 NO Checked the LCD Driver Ground YES IC901 57 IC401 29 NO Checked the LCD Driver RESET YES IC901 61 NO Checked the LCD Driver OSC YES IC401 23 24 25 29 CN402 9 10 16 18 IC901 57 62 63 64 NO Checked the LCD Driver data interface YES IC901 1 55 LCD Check the short NO Checked the LCD to LCD Driver line ...

Page 17: ... OK YES IC101 6 22 NO Checked the Tuner VDD YES IC801 4 5 IC401 95 D817 NO Checked the Tuner VDD control YES IC101 5 10 17 23 NO Checked the Tuner GND YES IC601 15 IC401 98 NO Checked the E VR Mute control YES IC101 18 19 IC401 1 2 NO Checked the I2C data YES IC101 8 9 NO Checked the Audio signal YES ...

Page 18: ...IC401 52 YES NO Checked the USB VDD YES IC501 4 5 7 9 12 44 49 51 74 77 81 102 104 116 117 NO Checked the USB interface IC GND YES IC401 42 R425 NO Checked the USB interface IC reset YES X502 NO Checked the USB interface IC X tal YES IC501 52 53 NO Checked the D D Port YES IC501 52 53 NO Checked the USB indication Port ...

Page 19: ...7 81 102 104 116 117 NO Checked the CD DSP GND YES IC401 42 R425 NO Checked the USB interface IC reset YES X502 NO Checked the DSP X tal IC401 26 27 28 60 NO Checked the DSP control YES 5A USB no sound OK YES IC501 52 53 NO Checked the CD DSP signal out YES 5B OK ...

Page 20: ...RRECTION FLOW CHART AUX no sound OK Something wrong with the AUX YES JK903 IC601 7 9 CN971 19 20 21 CN402 4 5 6 NO Checked the AUX Signal input YES See the Sound Error correction Process NO Checked the E VR Power AMP YES ...

Page 21: ...2 12 WAVEFORMS 1 MICOM IC401 DISPLAY CN402 IC401 PIN25 IC401 PIN23 IC401 PIN24 IC401 PIN29 2 MICOM IC401 TUNER IC IC101 IC401 PIN2 IC401 PIN1 3 MICOM IC401 VOLUME IC IC601 IC401 PIN32 IC401 PIN31 ...

Page 22: ...1 4 13 8 DN 4 13 9 DP2 4 13 10 EP1 4 13 11 EN1 4 13 12 EN2 4 13 13 EP2 4 13 14 MIN 4 2 15 MUTE 5 16 LRST 0 17 LOUT 0 18 OUTS2 4 22 19 OUTS1 4 22 20 OUTR2 4 22 21 OUTR1 4 2 22 OUTF2 4 2 23 OUTF1 4 2 24 VCC 8 43 25 SCL 5 26 SDA 5 27 GND 0 28 FIL 4 2 IC804 PIN PIN NAME Voltage 1 TAB 0 2 PW GND2 0 3 OUT2 6 88 4 STBY 4 997 5 OUT2 6 88 6 VCC2 14 38 7 OUT1 6 89 8 PW GND1 0 9 OUT1 6 87 10 RIPPLE 6 77 11 I...

Page 23: ... input terminal of 1ch 12 EN2 E negative input terminal of 2ch 13 EP2 E positive input terminal of 2ch 14 MIN Mixing input terminal Terminal Terminal Description No Name 15 MUTE External compulsory mute terminal 16 LRST Level meter reset terminal 17 LOUT Output terminal for Level meter 18 OUTS2 Subwoofer output terminal of 2ch 19 OUTS1 Subwoofer output terminal of 1ch 20 OUTR2 Rear output terminal...

Page 24: ...PUT Control 300 mA 300 mA VCC GND Start up Vref Over Voltage Protection CTRL1 CTRL2 CTRL3 AMP_HS SW VCC 1 V 500 mA 500 mA 500 mA Ilim 1300 mA VCC1 VCC ILM output 8 4 V AUDIO output 8 4 V Recommendation FET 2SJ650 USB output 5 V CD output 8 V VDD output 5 7 V DSP output 3 3 VCC ...

Page 25: ... ON when CTRL1 M H 8 4 V 0 5 A 6 CTRL2 CTRL2 input pin Four value input 7 DSP DSP output pin ON when CTRL1 M H 3 3 V 0 3 A 8 CTRL3 CTRL3 input pin Two value input 9 FB USB FB pin 1 26 V 10 USBGT Pch FET gate connect pin 12 0 V 11 EXT EXT output pin ON when CTRL2 M2 H VCC 0 5 V 500 mA 12 RSNS USB current detection resistance connection pin 14 3 V 13 VDD VDD output pin 5 7 V 0 3 A 14 VCC1 VDD power ...

Page 26: ...VCC1 VCC2 TAB Ripple C2 B C3 C5 9 Out1 11 C1 8 7 PW GND1 Out1 IN1 5 Out2 12 C1 2 3 PW GND2 Out2 IN2 17 Out3 15 18 19 PW GND3 Out3 IN3 21 Out4 14 C1 24 23 PW GND4 Out4 IN4 13 16 C1 C6 4 Stby 25 22 Mute C4 R1 Play Mute RL RL RL RL Pre GND AC GND Offset short ...

Page 27: ...2 18 ...

Page 28: ...ker out Power Antenna Remote Optional 4 CH HARNESS SK101 1 0 8 K J 1 0 6 K J 3PIN CONNECTOR Wired Remocon Optional CN404 11PIN CONNECTOR 17PIN CONNECTOR CN501 CN502 24PIN MAIN BOARD CN402 CONNECTOR 1LINE LCD Jack USB Connector JK903 CN971 CN902 CONNECTOR FRONT BOARD 24PIN AUX ...

Page 29: ...OM SANYO LC87F5WC8A ROM 128 Kbyte MP4462 TAMUL S5L8035 PCM 1808 ADC USB SDRAM SPI I2S D D SPI SPI I2C LED TR Whit R G B 3PORT Motor Driver IC SPI 16 Mbit SDRAM ETRON EM636165TS 7G 4 Mbit Serial Flash MXIC W25X40BVSSIG DI CL CE RST KEY1 VOL UP RMC VOL DN FRT DET e LED TR 24PIN 30PIN FFC CNT FLIP DOWN CD DECK USB 5 V TJ4230 Detachable 24PIN Flip Down 30PIN CONNECTOR LCD FRONT USB SOCKET l LED Tact S...

Page 30: ... LED GREEN ADC KEY1 KEY2 LCD AUX LCD BLU WHITE LED REMOCON LCD BLU KEY AUX R L RMC USB SOCKET JACK D D HITE ED REEN COM SEG DATA LCD_RST LCD_CE LCD_DO LCD_CLK LCD_WH LED_R LED_G LCD Driver IC MC5502 ST E O LK LED_D LCD_R LCD_C LCD_D LCD_CL Detachable 24PIN Flip Down 30PIN CONNECTOR OPTIONAL 2 23 2 24 ...

Page 31: ... 3 TB2931HQ MICOM SANYO LC87F5WC8A 16 Mbit SDRAM EM636165TS 7G 4 Mbit Serial Flash W25X40BVSSIG AUDIO_8 4 V 500 mA DSP_3 3 V 300 mA CD 8 V VDD 3 3 V CD 8 V Audio 8 4 V CPU TAMUL S5L8035U White LED TR CD_8 1300 mA ILL_8 4 V 500 mA CTRL2 LM1117S 1 2 V Motor Driver ILL 8 4 V 3 color LED TR LED SANYO MULTIREG 500 CTRL3 FRONT 5 V CP CHIP TJ4230 MP4462 FRO 24PIN 30PIN DETACHABLE Connector Front Panel LV...

Page 32: ...CIRCUIT DIAGRAMS 1 MAIN_1 CIRCUIT DIAGRAM 2 27 2 28 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MAIN EAX64686601_7_1 3 SD 1 2012 02 07 ...

Page 33: ...2 29 2 30 2 MAIN_2 CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MAIN EAX64686601_7_1 3 SD 2 2012 02 07 ...

Page 34: ...3 FRONT CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T FRONT EAX64686001_7_1 4 SD 2012 02 07 2 31 2 32 ...

Page 35: ...PRINTED CIRCUIT BOARD DIAGRAMS 1 MAIN P C BOARD 2 33 2 34 TOP VIEW BOTTOM VIEW ...

Page 36: ...2 FRONT P C BOARD 2 35 2 36 TOP VIEW BOTTOM VIEW ...

Page 37: ...2 37 2 38 ...

Page 38: ...WS 1 CABINET AND MAIN FRAME SECTION A45 MAIN 290 A43 293 451 451 451 451 456 292 FRONT A50 270 279 281 282 LCD901 284 453 285 283 276 A46 298 280 297 250 A42 254 256 251 253 255 Accessory Loc No Loc No 801 850 Loc No 818 Loc No 835 ...

Page 39: ...3 3 3 4 ...

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