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<External input (Component)>No picture on the display (7)

Does not the picture display when RCA cable plugged into component?

Main UNIT:

Is Component Y/Pb/Pr signal sent to pin

(2)/Y, (4)/Pb, (6)/Pr of CN1202?

<External input

Input(Component)>No picture on the

YES

Check the setting of an external input

device that connects of CN1202

NO

NO

Check the line between IC U2102 and

Refer to “The picture doesn't appear in

YES

Terminal

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Summary of Contents for LC-50LE442U

Page 1: ...SERVICE MANUAL LED COLOR TELEVISION MODEL LC 50LE442U ...

Page 2: ... CHAPTER 5 MAJOR IC INFORMATIONS 1 MAJOR IC INFORMATIONS 47 CHAPTER 6 BLOCK DIAGRAM WIRING DIAGRAM 1 BLOCK DIAGRAM 51 2 POWER MANAGEMENT BLOCK DIAGRAM 52 3 WIRING DIAGRAM 53 CHAPTER 7 PRINTED WIRING BOARD 1 MAIN UNIT PRINTED WIRING BOARD 54 2 POWER UNIT PRINTED WIRING BOARD 56 3 KEY UNIT PRINTED WIRING BOARD 58 4 IR UNIT PRINTED WIRING BOARD 58 CHAPTER 8 SCHEMATIC DIAGRAM 1 MAIN SCHEMATIC DIAGRAM ...

Page 3: ...2 ...

Page 4: ...3 ...

Page 5: ...4 CHAPTER 1 OPERATION MANUAL 1 SPECIFICATIONS ...

Page 6: ...5 2 DIMENSIONS LC 50LE442U TV screen size Inches VESA compatible wall bracket millimeters W H Screw type ...

Page 7: ...6 50 400 400mm Metric 8 14mm Setting the TV on the wall LC 50LE442U ...

Page 8: ...7 CHAPTER 2 Removing of Major Parts LC 50LE442U 1 Assy Panel Removal Notes Please put your machine on soft material to avoid scrape panel when you disassemble it Front view Fig 1 Back view Fig 2 ...

Page 9: ...8 Step1 Remove the Base Assy Remove the 4 screws as Fig 3 and pull out the base Fig 3 Step 2 Remove the REAR COVER Assy 1 Remove the 19 screws around the REAR COVER as Fig 4 Fig 4 ...

Page 10: ...9 2 Remove the 3 screws at the IO area as Fig 5 Fig 5 3 Remove the 3 screws to release AC cable as Fig 6 Fig 7 Fig 6 Fig 7 ...

Page 11: ...10 Step3 Remove the Main Power IR board Key Pad ASSY and the Speakers Fig 8 1 Remove the 8 screws and disconnect 4 cables Detach the Main board ASSY as Fig 9 Fig 9 ...

Page 12: ...11 2 Remove the 4 screws and 3 Cables Detach the Power board as Fig 10 Fig 10 3 Remove the 1screws Detach the IR board as Fig 11 Fig 11 ...

Page 13: ...12 4 Remove the 2screws Detach the Key Pad ASSY as Fig 12 Fig 12 5 Detach the Speakers as Fig 13 Fig 14 Fig 13 Fig 14 ...

Page 14: ...13 Step4 Remove BASE SUPPORT Remove the 8 screws Detach the BASE SUPPORT as Fig 15 Fig 15 Step5 Remove PANEL module 1 Detach the PANEL HOLDER 9 pcs as Fig 16 Fig 16 ...

Page 15: ...xe d Backlight 0 100 100 Contrast 0 100 50 Brightness 0 100 50 Color 0 100 50 Tint 50 50 0 Sharpness 0 20 10 Advanced Color Temp Color Temp User Cool Standard Warm R Gain 0 255 G Gain 0 255 B Gain 0 255 Reset Yes No Active Contrast Off On DI Film Mode Off Auto Digital Noise Reduction Off Low Medium High Auto Reset Only reset currect AV mode settings Yes No Audio Settings Treble 0 100 50 Disable wh...

Page 16: ...reo SAP Audio Language English Spanish French Change CC Analog Closed Caption Off CC1 CC2 CC3 CC4 TEXT1 TEXT2 TEXT3 TEXT4 Digital Closed Caption Off Service1 Service2 Service3 Service4 Service5 Service6 Input Terminal Setting Audio Setup Off Dolby Digital PCM PC input For PC only Auto Sync Fine Sync H Pos V Pos Clock Phase Audio Select For PC only Video Video Audio Audio Select For HDMI only Auto ...

Page 17: ...d Cyan Yellow Magenta Foreground Opacity Solid Translucent Transparent Background Color Black White Green Blue Red Cyan Yellow Magenta Background Opacity Solid Translucent Transparent Window Color Black White Green Blue Red Cyan Yellow Magenta Window Opacity Solid Translucent Transparent Initial Setup EZ Setup Broadcasting Setup For TV only CH Setup Air Cable Air Cable CH Search CH Memory Favorite...

Page 18: ...et No New Secret No Confirm Secret No Parental CTRL V Chip MPAA G PG PG 13 R NC 17 X NONE TV Guidelines TV Y TV Y7 TV G TV PG TV 14 TV MA NONE D L S V FV Can English Ratings E C C8 G PG 14 18 NONE Can French Ratings E G 8ans 13ans 16ans 18ans NONE V Chip DTV Only Status No Yes Reset Yes No Information Identification ...

Page 19: ...Pattern to Medium 3 Enter VideoÆColor Temperature adjust Color temperature adjusts 1 Set color temperature to Cool 2 Adjust R Gain G Gain values to meet Cool color coordinates Keep B Gain set 128 3 Adjust R Offset G Offset values to meet Cool color coordinates Keep B Offset set 128 4 Repeat step 2 3 4 twice to meet Cool color coordinates specification below 5 Set color temperature to Warm Standard...

Page 20: ...ontrol at 100 Backlight control at 100 For LC 50LE442U Test color mode User mode 2 SERVICE MODE Enter factory mode menu press MENU Numeric keys 3481 to enter factory mode You can press RETURN key to back to normal main menu 3 FACTORY MODE AUTOMATION BEHAVIOR For factory checking channels convenient so entered factory mode will auto install factory pre channels to instead of user s channels table a...

Page 21: ...ion V2 0 copy NAS2A_89 pkg to USB disk IV Insert the USB disk to TV USB port V TV AC power off AC power on VI TV will upgrade by itself after detect the USB disk condition and the content of the pkg file Note TV s LED will flash during upgrade process VII After finish upgrade process TV will reboot by itself VIII Remove USB disk from TV IX Press MENU select InformationÆIdentification X Check the s...

Page 22: ...ES Check IC U2102 and its peripheral circuits Is audio signal input to pin 6 AOSDATA0 pin 7 AOBCLK pin 8 AOLRCK and pin 5 AOMCLK of IC U6102 AMP Check the line between IC U2102 and IC U6102 Is MUTE circuit YDA_MUTE normal Check the PD R6130 Q6101 R6134 etc Is the audio signal output of pin 1 2 L ch and pin 3 4 R ch of CN6101 AOUDIO CONNECTOR normal Check IC U6102 and its peripheral circuits Check ...

Page 23: ... when UHF VHF is received MAIN UNIT YES NO Is the DIF signal output from pin 10 and pin 11 of TUNER TU9102 NO Check the tuner and its peripheral circuits Replace as required Is the DIF signal sent to pin 58 and pin 59 of IC U2102 Check IC U2102 its peripheral circuits YES Refer to No sound output in all modes ...

Page 24: ...ut MAIN UNIT YES NO Is the audio signal properly sent to pin 8 and pin 10 of CN1202 NO Check the connection to CN1202 and the external input device Is the audio signal properly sent to pin 68 AIN0_R and pin 70 AIN0_L of IC U2102 Check the line between CN1202 and IC U2102 YES Refer to No sound output in all modes ...

Page 25: ...N UNIT YES NO Is the audio signal properly sent to pin 3 and pin 2 of CN1102 NO Check the connection to CN1102 and the external input device Is the audio signal properly sent to pin 67 AIN1_R and pin 69 AIN1_L of IC U2102 Check the line between CN1102 and IC U2102 YES Refer to No sound output in all modes ...

Page 26: ...udio format correct Change to correct mp3 format MAIN Is the USB 5V Q7105 sent to pin 1 of CN1104 Is the USB con CN1104 signal properly sent to pin 233 USB_DM0 and pin 234 USB DP0 of IC U2102 Refer to No sound output in all modes NO NO Check the connection to Q7105 and the external input device Check the line between CN1104 and IC2102 ...

Page 27: ... 12 OUTL and pin 3 OUTR of IC U6201 to Jack CN6201 Terminal Check IC U2102 and its peripheral circuits Is the audio signal output from IC U2102 pin 74 AL1O and pin 76 AR1O to pin 3 OUTR and pin 12 OUTL of IC U6201 Check the connection to HPOL R OUT and external devices Check the line between IC U2102 and IC U6201 YES No No ...

Page 28: ...nal CN6202 Is input source on HDMI The SPDIF out not support HDMI source No Is the audio signal output from IC U2102 pin 92 ASPDIF sent to CN6202 No Check IC U2102 and its peripheral circuits Change input source to others AV TV etc Check the line between IC U2102 and CN6202 Terminal ...

Page 29: ...he display 1 The picture doesn t appear in all modes Check signal BL_PWM BL_ON PSON ID_0 1 2 LVDS_Power _ON LVDSVDD are normally or not Similarly is the LVDS signal input to connector of the panel module Check the panel module Check IC U2102 and its peripheral control circuits Check relative components are ok or not Wire harness is checked NO NO YES YES YES ...

Page 30: ...2 or not Is the DIF signal output from pin 10 and pin 11 of TUNER TU9102 Is the DIF signal sent to pin 58 and pin 59 of IC U2102 Refer to The picture doesn t appear in all modes Check each power IC and peripheral components are correct or not Check the tuner and its peripheral circuits Replace as required Check IC U2102 its peripheral circuits NO NO NO YES YES YES ...

Page 31: ...input into pin RX3_2 RX3_2B RX3_1 RX3_1B RX3_0 RX3_0B RX3_C RX3_CB of IC U2102 Refer to The picture doesn t appear in all modes Check the line between pin 78 of IC U2102 and CN8103 Check the line between IC U2102 and NO NO YES YES Is the HOT_PLUG detection function of pin 19 of HDMI terminal CN8103 Check the connection and setup with the external HDMI devices ...

Page 32: ...t into pin RX1_2 RX1_2B RX1_1 RX1_1B RX1_0 RX1_0B RX1_C RX1_CB of IC U2102 Refer to The picture doesn t appear in all modes Check the line between pin 7 of IC U2102 and CN8101 Check the line between IC U2102 and NO NO YES YES Is the HOT_PLUG detection function of pin 19 of a HDMI terminal CN8101 Check the connection and setup with the external HDMI devices ...

Page 33: ...t into pin RX2_2 RX2_2B RX2_1 RX2_1B RX2_0 RX2_0B RX2_C RX2_CB of IC U2102 Refer to The picture doesn t appear in all modes Check the line between pin 1 of IC U2102 and CN8102 Check the line between IC U2102 and NO NO YES YES Is the HOT_PLUG detection function of pin 19 of a HDMI terminal CN8102 Check the connection and setup with the external HDMI devices ...

Page 34: ...deo format correct Is the USB 5V sent to pin 1 of YES Change to correct jpg or jpeg or png or bmp format NO NO Check the fuse F1101 and the external input device Is the USB con CN1104 signal properly sent to pin 233 USB_DM0 and pin 234 USB_DP0 of IC U2102 YES Refer to The picture doesn t appear in NO Check the line between CN1104 and IC YES ...

Page 35: ...d into component Main UNIT Is Component Y Pb Pr signal sent to pin 2 Y 4 Pb 6 Pr of CN1202 External input Input Component No picture on the YES Check the setting of an external input device that connects of CN1202 NO NO Check the line between IC U2102 and Refer to The picture doesn t appear in YES Terminal ...

Page 36: ... Set the timing which TV is support NO Terminal Is R G B H V signal sent to pin 1 RED 2 Green 3 BLUE 14 H sync Is R G B H V signal sent to pin 32 RED 30 Green 28 BLUE YES Main UNIT YES Refer to The picture doesn t appear in Check the setting of an external input device that connects of CN1101 NO Check the line between IC U2102 and NO YES ...

Page 37: ...tifier diode to check the output voltage Is the voltage of 12V applied to pin 11 12 13 of CN201 Does the standby circuit normal QM104 TM101 ZD102 DM103 the circuit around the um102 and protection circuit ect is checked Is 5V output as for power on off switch when is on YES Is 24V output as for power on off switch when is on Does the UM103 UM108 LM101 and the circuit around IC UM103 UM108 Check the...

Page 38: ...t details for still pictures The special color processing technology provides natural deep colors and true studio quality video Also the MT5389FUNU family has built in high resolution and high quality audio codec Rich Features for High Value Products The MT5389FUNU family enables true singlechip experience It integrates high quality HDMI1 4a high speed VGA ADC LVDS mini LVDS option EPI option USB2...

Page 39: ...8n prefetch architecture is combined with an interface designed to transfer two data words per clock cycle at the I O pins A single read or write operation for the DDR3 L SDRAM consists of a single 8n bit wide four clock data transfer at the internal DRAM core and two corresponding n bit wide one half clock cycle data transfers at the I O pins Read and write operation to the DDR3 L SDRAM are burst...

Page 40: ...Weighted Filter Efficiency 92 VDDP 12V RL 8Ω Po 10W Channel Separation 80 dB VDDP 12V RL 8Ω 1kHz Power Limit Function 15W RL 8Ω min THD N 10 Output Mute Function Quick Mute Quick Start Sleep Function Pop Noise Reduction Function Overcurrent Protection Function OCP Over Temperature Protection Function OTP Under Voltage Lockout UVLO DC Detection Function DCDET Clock Detection Function CKDET Package ...

Page 41: ...ons for power management are available when the serial port is inactive The auto powerdown feature functions when FORCEON is low and FORCEOFF is high During this mode of operation if the device does not sense a valid RS 232 signal on the receiver input the driver output is disabled If FORCEOFF is set low and EN is high both the driver and receiver are shut off and the supply current is reduced to ...

Page 42: ...AM 1 BLOCK DIAGRAM TUNER YDA175 AUDIO AMP LVDS OUT SPEAKER 1Gb DDR3 8MB FLASH H702F RS 232 HDMI3 Rear HDMI2 Rear Side HDMI1 PC INPUT I2S YPbPr CVBS USB SPDIF Output ASPDIF NAFTA NAFTA Side Side Earphone Hotel Mode MT5389 Earphone amp DRV632 ...

Page 43: ...he power parts one is interface board including USB and TV tuner et the other is inverter board and audio circuit 24V output is inverter part The system block diagram as below the last is panel Vcc and audio the power is 12V DC 24V 1 6A output to Inverter Standby DC 5 3V 2A output to IF BD DC DC Rectifier filter ACD DC 12V 2 23A output to Audio AC INPUT EMI ACD fig 1 ...

Page 44: ...43 3 WIRING DIAGRAM ...

Page 45: ...44 CHAPTER 7 PRINTED WIRING DIAGRAM 1 MAIN UNIT PRINTED WIRING BOARD TOP LC 50LE442U ...

Page 46: ...45 BOTTOM LC 50LE442U ...

Page 47: ...46 2 POWER UNIT PRINTED WIRING BOARD Top Layer ...

Page 48: ...47 Bottom Layer ...

Page 49: ...48 3 KEY UNIT PRINTED WIRING BOARD 4 IR UNIT PRINTED WIRING BOARD ...

Page 50: ...49 CHAPTER 8 SCHEMATIC DIAGRAM 1 MAIN SCHEMATIC DIAGRAM 01 System POWER ...

Page 51: ...50 02 MT5389 ...

Page 52: ...51 03 DDR3 DRAM Flash ...

Page 53: ...52 04 Peripheral IR Keypad ESD ...

Page 54: ...53 05 HDMI ...

Page 55: ...54 06 VGA RS 232 USB ...

Page 56: ...55 07 YPbPr ...

Page 57: ...56 08 Audio amp ...

Page 58: ...57 09 Headphone line out SPDIF ...

Page 59: ...58 10 LVDS 11 Tuner ...

Page 60: ...ing AC Power F102 is fuse to protect all the circuit AC Input voltage is single 120V CY101 CY102 CY103 are used high frequency noise of primary between common GND LX103 LX104 CX101 CX102 is used to filter low frequency noise RX101 RX102 and RX103 are used to discharge CX101 and CX102 remnants voltage ...

Page 61: ...60 2 Standby Control DC DC ACD Circuit fig 8 Fig 8 Fig 9 ...

Page 62: ...g operation It features a high voltage current source to directly supply the startup current from two half wave rectifier diodes further to provide lossless startup circuit Max start up current for UM102 is 10mA When current flow from two half wave rectifier diodes through RM107 and RM111 gets to HV pin to start up UM102 Meanwhile the VCC supply current is as low as 550uA thus most of the HV curre...

Page 63: ...m will be shut down completely and consume almost zero power For low standby power application it s important to make current in this path as small as possible The deglitch delay time of the disable function is about 20us The internal bias current of EN DIS is 2uA For low power consumption it s a high impedance pin Therefore proper layout is necessary for noise immunity If capacitor is unavoidable...

Page 64: ...7 NC 1000p 25V MENU R904 8 2K 1 INPUT 1 01V INPUT C908 NC 1000p 25V VOL D902 0 055p 24V ME Top Down Sequence 2K12 H2 4 IR SCHEMATIC DIAGRAM IR LED1_ON_OFF D102 LTST C190KRKT 1 2 5VSB 新帶Lock CN ADC_SDA Light_Sensor_I2C C109 1u 16V R111 NC 1K C104 NC 1000p 50V U101 FM 1038FN 5CN 3 2 1 4 VCC VOUT GND GND IR D103 0 055p 24V R114 51K D102 NC 5VSB C101 NC 10u 10V I2C_SCLK D105 0 055p 24V Q101 NC PMBT390...

Page 65: ...ct description Usa ge Photo 1 Panel 9JY76040T100531G LCDModule TFT TV 50Inch 1920 1080 30 0cd m 2 5000 1 8ms G V500HJ1 LE1 1 2 PCBA 9JY0150CTN06100 LC 50LE442U CTN0 6 Mother Board 1 3 9JY0950CTN02000 LC 50LE440U CTN02 Power Board 1 4 9JY0350CTN02000 LC 50LE440U CTN02 Keypad Board 1 5 9JY0432CTG05001 LC 32SV40U CTG05 IR Board 1 6 Cosmetics 9JY00900013176 ASSY FRONT BEZEL CTN06 1 ...

Page 66: ...N02 1 10 9JY00900011926 ASSY BACK COVER CTN02 1 11 9JY01201019574 FUNCTION KEY CTG04 1 12 9JY02501022530 IF SHIELDING CTL02 1 13 9JY02500013942 PANEL HOLDER CTN02 9 14 9JY01201019663 AC COVER VT464D 1 15 Cable 9JY35101YM00600G LCD Cable Assembly 350mm 10 0mm G 1 16 9JY35071BT00600G AC Power Cable 1 6m 0 25m 50mm 18AWG 1 ...

Page 67: ...e Assembly 700mm 14 0mm G 1 19 9JY35101YQ00600G LCD Cable Assembly 1350mm 15 0mm G 1 20 Speaker 9JY57020RH0035CG Speaker Unit 6ohm 10W G 603 0001 8016 1 22 Accessory 9JY600153G00886G Remote Controller IR NEC 8 m G RC LCDTV 5 1 23 Screw 9JY06004013247 SCREW B CROSS M 5 25L Φ5 30 BLK Zn ROHS 4 ...

Page 68: ...67 2 CABINET PARTS LC 50LE442U ...

Page 69: ...68 ...

Page 70: ...00153G00886G Remote Controller IR NEC 8m G RC LCDTV 520 2 9JY89010330021YG Primary Battery 1 5V Zn Mn Battery 3 9JY00900011928 ASSY BASE CTN02 9JY06004013247 SCREW B CROSS M5 25L Φ5 30 BLK Zn ROHS 4 9JY08300012493 USER MANUAL CTN06 5 9JY08300011102 CONNECTION GUIDE CTN02 ...

Page 71: ...70 4 PACKING PARTS LC 50LE442U ...

Page 72: ...ASSY SCREW FOR END CUSTOMER CTN02 1 14 9JY600153G00886G Remote Controller IR NEC 8m G RC LCDTV 520 1 15 9JY89010330021YG Primary Battery 1 5V Zn Mn Battery 44 5mm 10 5mm G GLR03A 2 16 9JY08300012492 KIT ACCESSORY CTN06 1 17 9JY08400012491 CARTON BODY CTN06 1 18 9JY08402017526 TAPE WRAPPING TYPE 914000MMX76MM 0 0018 19 9JY08404017275 LABEL BLANK 60x15mm 1 20 9JY08300012393 Wrapping Band 1000Mx12MMx...

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