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TCL L42HDM61 Service Manual
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TCL L42HDM61 Service Manual

TCL L42HDM61 Service Manual

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Service Manual
1. Caution··························································································2
2. Specifications of chassis·································································6
3. Alignment Procedure·······································································9
4. Circuit Description·········································································16
5. Schematic Diagram········································································30
6. PCB Layout···················································································49
7. Explode View·················································································51
8. BOM List·······················································································57
This manual is the latest at the time of printing, and does not
include the modification which may be made after the printing, by
the constant improvement of product.
TCL
L42HDM61

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Summary of Contents for TCL L42HDM61

  • Page 1 Service Manual L42HDM61 1. Caution··························································································2 2. Specifications of chassis·································································6 3. Alignment Procedure·······································································9 4. Circuit Description·········································································16 5. Schematic Diagram········································································30 6. PCB Layout···················································································49 7. Explode View·················································································51 8. BOM List·······················································································57 This manual is the latest at the time of printing, and does not include the modification which may be made after the printing, by the constant improvement of product.
  • Page 2 CAUTION: Use of controls, adjustments or procedures other than those specified herein may result in hazardous radiation exposure. CA UTION: TO REDUCE THE RISK OF CAUTION ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE RISK OF ELECTRIC PARTS INSIDE.

  • Page 3: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS CAUTION: Read all of these instructions. Save these instructions for later use. Follow all Warnings and Instructions marked on the audio equipment. 1. Read Instructions- All the safety and operating instructions should be read before the product is operated. 2.
  • Page 4 PROTECTION AND LOCATION OF YOUR SET Do not use this television set near water ... for example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wet basement, or near a swimming pool, etc. Never expose the set to rain or water. If the set has been exposed to rain or water, unplug the set from the wall outlet and refer servicing to qualified service personnel.
  • Page 5 OPERATION OF YOUR SET 18. This television set should be operated only from the type of power source indicated on the marking label.If you are not sure of the type of power supply at your home, consult your television dealer or local power company. For television sets designed to operate from battery power, refer to the operating instructions.
  • Page 6 2 PRODUCT SPECIFICATION LCD TV for EM market TTE ShenZhen R&D Center FPTV Design Department date: June 16, 2007 (Wise) 2007.08.07 Check : 19:55:43 +08'00' Confirm: Product Description Spec. and Features L42M61S2 L42E62S2 L42M71S2 Market position South America market South America market South America market MasterData Customer Id...
  • Page 7 Yes/No Yes/No Yes/No +Surround Sound/BBE +Sound Features Auto volume level (AVL),BTSC,SAP,Sound Effects Auto volume level (AVL),BTSC,SAP,Sound Effects Auto volume level (AVL),BTSC,SAP,Sound Effects (Stereo,MUSIC,NEWS,MOVIE,Personal), Treble,Bass,Woofer (Stereo,MUSIC,NEWS,MOVIE,Personal), Treble,Bass,Woofer (Stereo,MUSIC,NEWS,MOVIE,Personal), Treble,Bass,Woofer +Sound Control Volume,Balance, mute Volume,Balance, mute Volume,Balance, mute User Interface Multi-coloured On Screen Display Multi-coloured On Screen Display Multi-coloured On Screen Display +Menu Colours...
  • Page 8 +Speaker Visibility General MT02(MT8202+MT8293) MT02(MT8202+MT8293) MT02(MT8202+MT8293) +Chassis +Software Delivery Mode reflashable reflashable reflashable +Software Version +Mains Voltage range AC 110v~240v AC 110v~240v AC 110v~240v +Mains Frequency 50/60Hz 50/60Hz 50/60Hz +Adaptor output power rate +Type Mains Cord Internal Power Module Internal Power Module Internal Power Module +Power Supply design +Power Consumption (P)TV in On...

  • Page 9: Alignment Procedure

    3 ALIGNMENT PROCEDURE 3.1 Product Overview Chassis MT02 is using the MT82xx series as the main chip embedded the MCU, Scaler, RAM, Video decoder and Audio processor. The circuit outside and alignment is very simple. The power consume is 180W Max. , the standby consume less than 1W. The Sound speaker’s power is 2x5W.The PSU has 3 part voltage output: one 5v for standby, one 24v for inverter, one 12v for signal process.
  • Page 10 Factory Menu 3.3.2 Enter the Field Service mode Use the IR and press the remote key “Vol-” to “0”, press mute remote key, then press 9,7,3,5 remote key. Press right key to enter the sub-menu and press MENU key to return the main-menu.
  • Page 11 Source It is the source of white balance adjusts that is SCART, CMP, HDMI, and VGA. White R/G/B It is used for the adjustment of white balance. Gray R/G/B It is used for the adjustment of gray balance. RGB Calibrate It is used for the software adjustment in VGA mode.
  • Page 12 Factory *********** MT: V*** System Blue Mute ON Switch of “BLUE” screen Balance CTI Middle Default. No need Adjusting. TV Geo Flash Tone ON Default. Must be “OFF” when adjusting white balance. Nicam Adaptive Luma Control ON Default. Must be “OFF” when adjusting white balance.
  • Page 13 Factory *********** MT: V*** System High DEVI Balance AM Mute TV Geo AM Mute high Nicam AM Mute low Mono Carrier shift Sound Saturation Mute Other FM Mute Info FM Mute High FM Mute Low Factory Alignment Process 3.3.3 Adjust the ADC channel of signal source Set “OFF”...

  • Page 14: Update The Software

    iii. White balance and color temperature adjusting on CMP state. On CMP state, go into “balance” of service menu. Input 576i/50Hz 8-class gray signal, test color coordinate with a color analyzer A. On the 3 gray of the bright side. Then adjust White R and White G and White B until the data on the analyzer become x=282 10, y=293 10, also bright value 220 nit.
  • Page 15 After update finished, power off the TV, then power on, at the first time that you power on the TV set, the display will be later than normal. Update through the VGA port. Connect by the cable (the tool and the cable) between the PC and the VGA port. Power on the set, press the key of the factory remote control.
  • Page 16 4 MT02 CIRCUIT DESCRIPTION 1 OVERALL DESCRIPTION: Chassis MT02 is using the MT82xx series as the main chip embedded the MCU, scaler, video decoder and audio processor. The circuit outside and alignment is very simple. The decoder IC MT8202 is made by MTK which is the company in Taiwan.MT8202 is a highly integrated single chip for LCD TV, it includes 3D comb fliter TV decoder to retrieve the best image from the popular composite signals.

  • Page 17: Key Components List

    According to the main board edition E 4 KEY COMPONENTS LIST Serial no. Part no. Name of IC function 13-MT8202-AGB LCDMT8202AG CPU\video decoder\scaler\nicam decoder U4/U5 13-281622-ETB5 HY5DU281622ET-5 DDR SDRAM 13-AL016M-90B FLASH S29AL016M90TFI02 13-M24C32-MNB M24C32-WMN6(S08) System EEPROM...
  • Page 18 13-SC2602-S0B SC2602 DC-DC 13-D13N03-LIB OHKD13N03LT Dual mos 13-SO2996- SP2996BEN-L/TR DDR termination BEBNL 13-CM2021-00B CM2021-00TR HDMI ESD 13-MT8293-E0B HDMI PANELLINK HDMI Decoder CINEMA RECEIVER MT8293E 13-AT24C0-2BB 2K AT24C02BN-10SU- HDMI EEPROM 13-00M24C-08B 8K M24C08 HDMI HDCP EEPROM 13-AT24C0-2BB 2K AT24C02BN-10SU- VGA DDC EEPROM U2(SCART BOARD) 13-HC4052- 74HC4052PW...
  • Page 19 5.2 U4/U5 The Hynix HY5DU281622ET air a 134,217,728-bit CMOS Double Data Rate(DDR) Synchronous DRAM,ideally suited for the main memory applications which requires large memory density and high bandwidth. The Hynix 128Mb DDR SDRAMs offer fully synchronous operations referenced to both rising and falling edges of the clock.While all addresses and control inputs are latched on the rising edges of the CK(falling edges of the /CK),Data,Data strobes and Write date masks inputs are sampled on both rising and falling edges of it.The data paths are intermally pipelined and 2-bit...
  • Page 20 5.3 U7 The S29AL016M is a 16Mbit,3.0 volt-only flash memory organized as 2,097,152 bytes or 1,048,576 words.
  • Page 21 5.4 U27 The SC2602 are low-cost,full featured,synchronous voltage-mode controllers designed for use in single ended power supply applications where efficiency is of primary concern,Synchronous operation allows for the elimination of heat sinks in many applications.The SC2602s are ideal for implementing DC/DC converters needed to power advanced microprocessors in low cost systems,or in distributed power applications where efficiency is important.Internal level- shift,high-side drive circuitry,and preset shoot-thru control,allows the use of inexpensive N- channel power switches.
  • Page 22 Typical Applications Circuit 5.5 U6 The SP2996B voltage regulator is designed to convert voltage supplies ranging from 1.6v to 6v into a desired output voltage which is adjusted by an external resistor divider. The regulator is capable of sourcing or sinking up to 2A of Continuous current while regulating an output voltage to within 20mv.

  • Page 23: Electrical Schematic

    Typical Appliacations Circuit 5.6 U36 The CM2021 is a HDMI receiver port protection and interface device. Electrical Schematic...
  • Page 24 5.7 U8 MT8293 is a low-cost,fully HDMI-compliant receiver that fits directly into home theater products such as LCD TVs,plasma TVs and HDTVs.The receiver is capable of supporting bandwidths up to 165MHz and video resolutions up to 1080p and UXGA.The MT8293 supports the DVD-Audio standard,including 7.1-surround audio at 96kHz and stereo audio at 192kHz.
  • Page 25 5.8 U12 The CS5340 is a complete analog-to-digital converter for digital audio systems.It performs sampling,analog-to-digital conversion,and anti-alias filtering,generating 24-bit values for both left and right inputs in serial form at sample rates up to 200kHz per channel. The CS5340 uses a 5 -order,multi-bit Delta-Sigma modulator followed by digital filtering and decimation,which removes the need for an external anti-alias filter.
  • Page 26 5.9 U15 The CS4334 family members are complete,stereo digital-to-analog output systems including interpolation,1-bit D/A conversion and output analog filtering in an 8-pin package. The CS4334 support all major audio data interface formats,and the individual devices differ only in the supported interface format. The CS4334 family is based on delta-sigma modulation,where the modulator output controls the reference voltage input to an ultra-linear analog low-pass filter.This architecture allows for infinite adjustment of sample rate between 2 kHz and 100 kHz simply by changing the master...
  • Page 27 5.10 U17/U18 The RC4558 is dual general-purpose operational amplifiers with each half electrically similar to the uA741 except that offset null capability is not provided. Block Diagram (each amplifier) 5.11 U16 YDA138 is a high efficient digital audio power amplifier IC that operates with a single 12V power supply.
  • Page 28 as power-down function and output mute function. Typical Applications Circuit 5.12 U14 Pericom Semiconductor’s PI5V330 true bidirectional Quad 2-channel multiplexer/demultiplexer recommended for both RGB and composite video switching applications.The video switch can be driven from a current output RAMDAC or voltage output composite video source.

  • Page 29: Block Diagram

    Block Diagram...
  • Page 30 MT8202M1V2 MT8202E (PBGA388) CRT/LCDTV DEMO/VERFICATION BOARD 4 LAYERS [1,2,4,6,8,9,10,11,12,13,14] +12V "GND Need Very Strong" +12V [1,2,9,10,11,12,14] GNDA GNDA [3,4,8,9,11,12,14] History Date 2005/09/30 1. INDEX / POWER / RESET TCL_V1.0 Modified 2006/05/25 TCL_V1.4 Modified 2006/08/17 2. LDO TCL_V1.5 Modified DIP12/WH/P2.0/R 3. MT8202E PBGA388 JP12A 4.
  • Page 31 DV33B DV33B [7,8,9,12,13,14] LVDS_GND LVDS_GND [3,4,14] SB+5V VFE_GND SB33B VFE_GND [3,4,10,11] VFE_GND1 Power ON alive source VFE_GND1 [2,4,8,9,10,12] +12V +12V [1,2,9,10,11,12,14] 5VSB [1,2,4,6,8,9,10,11,12,13,14] 4.7uF / 0805 0.1uF DV18A SB33 SB33A SB18A AZ1117/adj AZ1117/adj 5VSB SB33A SB18 SB18A C167 C101 C168 100uF/16v 100Uf/10v 4.7uF/10v...
  • Page 32 SB33B SB33B TP23 TP94 TP95 SCART_FB SCART_FB [11] 100k Modified by Bin_wang.2006/01/20 CCIR_VCLK CCIR_VCLK XTALI XTALO CCIR_V[0..7] CCIR_V[0..7] 27MHz SYSROMWP 0.1uF 2N3904 27MHZ 27MHZ SOT23/SMD 16pF 16pF HDMIMCLK HDMIMCLK [8,9] GPIO4 HDMIBCLK EEPROM 24C32 HDMIBCLK [8,9] LVDS_GND HDMILRCK SOP8/SMD HDMILRCK [8,9] 10K/NC HDMISD0...
  • Page 33 NORMAL ANALOG POWER STANDBY ANALOG POWER CLOSE TO 8202 PIN ASB18A ASB18A XTALVDD AVICM XTALVDD XTALVDD PLLVDD1 ADCVDD CB25 ADCVDD 0.1uF 10uF/10v AVICM CE23 CB26 CE24 CB27 C0805/SMD AVICM 4.7uF/10V 4.7uF/10V 4.7uF 0.1uF 4.7uF 0.1uF AUDIO_GND PWM2VREF C0402/SMD C0402/SMD PWM2VREF LVDS_GND LVDS_GND DACFS...
  • Page 34 MT8202 DIGITAL POWER & DECOUPLING DV18A SB33A SB18A 0402 PUT ON NEARLY BGA SB18A CB49 CB50 CB51 CB52 CB53 CB54 0.1uF 0.1uF 3300pF 0.1uF 0.1uF 0.1uF 0.1uF C0402/SMD C0402/SMD C0402/SMD C0402/SMD C0402/SMD 0402 PUT ON NEARLY BGA 0402 PUT ON NEARLY BGA 3300pF 3300pF 3300pF...
  • Page 35 DV25B DV25B IOA1 F_D0 D1V25 IOA2 F_D1 A_RA3 D_RA3 IOA3 F_D2 A_RA2 D_RA2 D_DQ0 D_DQ15 IOA4 F_D3 DQ15 A_RA1 D_RA1 D_RA3 IOA5 F_D4 VDDQ VSSQ A_RA0 D_RA0 D_DQ1 D_DQ14 D_RA2 IOA6 F_D5 DQ14 D_DQ2 D_DQ13 D_RA1 IOA7 F_D6 DQ13 22x4 D_RA0 F_A8 F_D7...
  • Page 36 VI[0..23] AVCC VI[0..23] DV33B PLUGPWR 5V_SUPPLY HDMICEN AVCC HDMICEN LV_SUPPLY HDMIODCK CE49 HDMIODCK HDMIDE CB131 10uF/10v HDMIDE CE50 DATA2+ DATA2+ C0805/SMD TMDS_D2+ TMDS_D2+ 1000pF HDMIHSYNC 4.7uF/16v 0.1uF HDMIHSYNC HDMIVSYNC 33uF/16v HDMIVSYNC TMDS_GND TMDS_GND DE_SOG DATA2- DATA2- DATA2+ DE_SOG TMDS_D2- TMDS_D2- HDMI TYPE-A GPIO17 DATA1+...
  • Page 37 VGA IN NEARLY VGA CON NEARLY IC RED+ RED+ RED- RED- R131 R132 10nF RED+ GREEN+ GREEN+ D-SUB15 FEMALE GREEN- GREEN- DSUB15/DIP/F BLUE+ BLUE+ BLUE- BLUE- RED_GND R133 VGASOG VGASOG GRN_GND 1N4148 VGASDA_IN GREEN VGAHSYNC# VGAHSYNC# [3] BLU_GND RED_GND R134 10nF RED- VGAVSYNC#...
  • Page 38 AUDIO ADC R156 SCL_V50 DV33B 2N7002 ADCVA ADCVD DV33B ADCVL N-MOSFET FB23 ADCVA R157 ADCVD FB24 ADCVL CE59 CE60 CB163 C103 CB164 CE61 C104 CB165 0.1uF 0.1uF 0.1uF 4.7uF/25V 4.7uF/25V 4.7uF/25V R158 ADCVL SDA_V50 ADCVL ADCVL DV33B 2N7002 R159 N-MOSFET R160 R161 ADCRST#...
  • Page 39 CVBS0 THIS PAGE NEARLY IC CVBS0 CVBS1 CVBS1 CVBS2 CVBS2 CVBS3 CVBS3 AVCVBS1 C136 4.7nF SOY1 AVCVBS0 R197 C110 47nF CVBS0 AVSY0 R198 C111 47nF C113 C114 330pF 330pF R/AVY1P R211 C137 100nF VFE_GND1 VFE_GND1 C138 15pF AVCVBS1 R200 C117 47nF CVBS1 AVSC0...
  • Page 40 SPEAKER/HEADPHONE OUTPUT AMP_+12V R233 R221 AOMCLK AOMCLK [3,11] C152 AOBCLK AOBCLK [3,11] 1000pF AOLRCK AOLRCK [3,11] OPVREF CE74 10uF/10V R234 R235 5.1K U17A CS4334 AUDIO DAC SPEAKER/HEADPHONE OUT FB25 OPVREF AUSPR CE75 10uF/10V R239 AOSDATA1 AOSDATA1 SPOUTR OPVREF R231 CE102 C151 C154 NJM4558 OPA...

  • Page 41: From Tuner

    Panel_Power RN33 33x4 JP11 R291 R292 PWM1 GPIO5 RN34 33x4 PWM1 GPIO5 +12V PDTC143ZT PDTC143ZT CLK1- SOT23/SMD SOT23/SMD CLK1+ RN35 33x4 TU_CVBS0 TU_CVBS0 [12,14] TU_AURO TU_AURO [11,12,14] TU_AULO TU_AULO [11,12,14] +12V +12V [1,2,9,10,11,12,14] RN36 33x4 LVDS_GND BEAD/SMD/0805 5A/32v RN37 33x4 LVDS OUT FUSE/SMD 0603 CLK2-...
  • Page 42 ADC_IN2 ADC_IN2 [3,11] [3,10,13] PWM0 PWM0 PWM1 PWM1 DV33B PWM_PANEL FOR CHI-MEI INVERTER PWM_PANEL CONNECTOR DV33B DV33B [7,8,9,12,13,14] R303 0/NC [1,2,4,6,8,9,10,11,12,13,14] R304 R305 TP78 R306 BRIGHTNESS BL_ON/OFF R308 PWM0 PWM_PANEL CB185 R309 2N3904 0/NC SOT23/SMD 4.7k SELECT Hi For External 12x1 W/HOUSING R.A SELECT SELECT Low For Internal...
  • Page 43 GPIO DECRIPTION AU_IN_L ERO3/GPIO : LVDS GPIO AU_IN_L [9,14] +12V ERO2/UP3_5 : SDA +12V [1,2,9,10,11,12,14] AVCVBS1 ERO1/UP3_1 : LED1 AVCVBS1 [11] TU_CVBS0 ERO0/UP3_0 : MAIN POWER SWITCH TU_CVBS0 [12,14] ADC_IN0 DE/GPIO : LVDS GPIO ADC_IN0 [3,14] CVBS_OUT DV33B VCLK/GPIO : LVDS GPIO CVBS_OUT [9,14] TU_AURO...
  • Page 44 JP603 AV1_IN Ouput Signal AV1_IN_GND Yellow AV CVBS(Out) AV1L_IN1 CVBS_OUT CVBS_OUT AVR_OUT AVR_OUT 100´ÅÖé AVL_OUT AVL_OUT R118 AVCVBS1 AV1_IN White AV1_IN AV1L_IN AV1R_IN1 AV1R_IN AV1_IN_GND R119 NC/47pF NC/47pF PESD3V3L4UG AV1_IN_GND 3RCA_JACKAV Input Signal CVBS IN AV2_IN AV2R_IN JP604 AV2L_IN AV2_IN_GND AVCVBS1 AVCVBS1 AV2_IN...
  • Page 45 Audio Switch AV1R AV2L SWV120 SWV120 SWV120 AV2R AUINR AUINL AV3R AV1L SW0S0 CE15 22uF/35V CE16 22uF/35V SW0S1 AV1R_IN AV1R AV2R_IN AV2R CD4052 AV3L SOP16/SMD Audio Input SWV120 SWV120 SWV120 R147 SCART SCART-1 CE21 22uF/35V PCR_IN AV1R_IN AV1R_IN CE18 22uF/35V CE19 22uF/35V AV1L_IN...
  • Page 46 SWV120 OUTPUT SIGNAL I/F MT8202_EU_AV_Board_V1.1 SWV120 AVCVBS1 GNDA GNDA AVCVBS2 GNDA 47uF/16V 0.1uF ( 2 Layers ) AV CVBS OUT AVCVBS3 GNDA CVBS_OUT CVBS_OUT AVSY0 GNDA AVR_OUT AVR_OUT AVL_OUT AVL_OUT GNDA AVSC0 GNDA CONNECT TO MAIN_BOARD VIDEO I/F AVV50 CVBS IN AVV50 AVCVBS1 AVCVBS1...