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XOCECO LC-42FE32 Service Manual

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LCD TELEVISION
LC-42FE32

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Summary of Contents for XOCECO LC-42FE32

  • Page 1 LCD TELEVISION LC-42FE32...

  • Page 2: Table Of Contents

    CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….………………………………… Working principle analysis of the unit……………………………….………….…………. Block diagram …………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………. Troubleshooting….…..………………………………………………………………..…… Schematic diagram………………………………………………………………………… APPENDIX-A: Assembly list APPENDIX-B: Exploded View...

  • Page 3: Safety Precautions

    Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
  • Page 4 would be unable to work and no way to get it repaired. If the connection wires, connectors or components fixed by the thermotropic glue need to disengage when service, please soak the thermotropic glue into the alcohol and then pull them out in case of damage.

  • Page 5: Alignment Instructions

    Alignment instructions 1. Test equipment Digital Multi-meter 54200 (Signal generator) PC (FLASH writing programs have to be installed first, W24CXX.EXE) VG849 (HDMI signal generator) CA210 (White balancer) DVD player (with HDMI output) Monitor 2. The alignment flow chart (see below figure) FLASH write N5, N9, N13, N24 Check accessories and then packing Production of main board, high frequency board,...
  • Page 6 3. Flash writing programs Flash write N5, N9, N13, N24 Flash write W24CXX.EXE to N13, N24 with self-made flash write tool on the line. Note: software upgrade of N5 from socket X51 software upgrade of N9 from USB interface software upgrade of N13, N24 from HDMI and VGA interface separately Adjustment of main board and high frequency board a) Connect the main board and high frequency board according the wiring diagram.
  • Page 7 h) Check if the color coordinates of the cool/warm color temperature at YPbPr (include 480i, 480P, 720P, 1080i), VIDEO(NTSC, PAL) and TV channels are within the scope of the corresponding value (permit ±8 error). 5 Functional Inspection 5.1 TV function Connect RF terminal to the central signal source, Enter Search menu →...
  • Page 8 Table 2 Component mode Point clock pulse Resolution H-frequency(kHz) V-frenquency(Hz) Remark frenquency(MHz) 720×480 15.734 59.94 13.5 480i(NTSC) 720×576 15.625 13.5 576i(PAL) 720×480 31.469 59.94 480p(NTSC PROG) 720×576 31.25 576p(PAL PROG) 1280×720 59.94 74.18 720p(59p) 1280×720 74.25 720p(60p) 1280×720 37.5 74.25 720p(50p) 1920×1080 33.75...

  • Page 9: Working Principle Analysis Of The Unit

    Working principle analysis of the unit 1. Video signal flow (see below figure) TV VIDEO signal(TV1, TV2) output from TUNER1 and TUNER2 is divided into two ways, one way is sent to PW328 process of main-picture; another way is sent to TVP5147 process of sub-picture. Likewise, analog video signal of AV1, AV2, Y/C is divided into two ways and separate sent to PW328 and TVP5147 to do the same process.
  • Page 10 2. Audio signal flow (see below figure) SIF1, SIF2 of TUNER1 and TUNER2 send straight to MSP4440G demodulate of MTS. The signal and the sound of AV1, AV2, VGA and YPbPr1, YPbPr2(via PIV331 to select signal),send to MSP4440G select output. CL/WS of HDMI-1, HDMI-2 and digital MEPG_CL/WS demodulated from PWM2000 via 3257 select after, it send to MSP4440G, while the data D1 and D2 of HDMI and PWM2000 send straight to MSP4440G.

  • Page 11: Block Diagram

    Block diagram FLASH 128M 4MBITS PWM2000 PWM328 slowbus Panel MASTER lvds MPEG 2 decode 30bit RGB SCALER RS-232 T312 TUNER1 TUNER2 TVP5147 DECORDER AV1/S YPrPb1 PIV331 YPrPB2 2X amplify V-OUT PIV331 Earphone SII9011 HDMI HDMI/DVI-1 receiver HDMI/DVI-2 Note: ATMEGA8L Video signal Audio signal I/O signal Digital audio signal...

  • Page 12: Ic Block Diagram

    IC block diagram 1. PWM2000 Feature: Main frequency of RSIC CPU up to 200MIPS USB controller MPEG2 decoder Intelligent controller Audio decode, supports formats of all kinds. In this system, it decodes TS audio signal, supports SPDIF output. Pin descriptions: Type Name Instruction...
  • Page 13 2. PWM328 Feature: Supports V-CHIP, CCD, OSD DEIMTERLACING SCALING PIP/POP Integrated ADC, VIDEO DECODER Block diagram is follow: Pin descriptions: Type Name Instruction PORTA0 SBBE0 Enable control of bus line of bit store PORTA1 SBBE1 ADC0 KEY1_328 Button ADC1 KEY2_AD_IN PWM0 BRIGHT Brightness of backlight control...
  • Page 14 3. TVP5147 Feature: VEDIO DECORDER of sub-picture BT 601 20-BIT 4:2:2 YCbCr output Block diagram is follow: Description of main periphery components: C19, C20, C22, C23, C27: isolating capacitor for video input R18: I2C sub-address select pin R19: connect to the ground to insure the signal format output of BT.601 R22: indicator pin of odd-even bit output: select pin of BT.601 signal format output 4.
  • Page 15 Block diagram is follow: 5. ATMEGA8L Feature: STANDBY power supply control WATCHDOG manual reset Remote, button reception Indicator light control The ATMEGA8L is an 8bit of high performance and low power consumption AVR single chip of ATMEL. 6. MSP4440G Feature: Multistandard sound process Multi-channel output, SPDIF output Interface of internal/external audio delay...
  • Page 16 Block diagram is follow: 7. MK3771 Feature: Analog pulse generator Generate all kinds of frequency, the system needs frequency of 54MHA, 74.175MHZ provided for PWM2000. Logic table is follow: B and C Clocks (MHz) BCLK CCLK1 CCLK2 74.175...
  • Page 17 VCSL Clocks (MHz) VCLK1 VCLK2 VCLK3 VCLK4 13.5 Block diagram is follow: 8. TPA3008 The TPA3008D2 is a 10-W (per channel) efficient, class-D audio amplifier for driving bridged-tied stereo speakers. The TPA3008D2 can drive stereo speakers as low as 8Ω. The high efficiency of the TPA3008D2 eliminates the need for external heatsinks when playing music.
  • Page 18 9. T312 Function: VSB/64QAM/256QAM demodulator, demodulate 44MHZ digital IF single into TS stream and sent to video decoder PW2000. L723 and C941make up into 44MHZ lowpass of cut-off frequency. L=330NH, C=39PF.

  • Page 19: Wiring Diagram

    Wiring diagram...

  • Page 20: Troubleshooting

    Trouble shooting 1. Fault clearance Before servicing please check to find the possible causes of the troubles according to the table below. 1.1 Antenna (signal): Picture is out of focus or jumping Bad status in signal receiving Poor signal Check if there are failures with the electrical connector or the antenna.
  • Page 21 signal types. Picture too bright and there is Check if the contrast setting is too high. distortion in the brightest area Possibly the output quality of DVD broadcaster is set too high. It maybe also due to improper terminal connection of the video frequency signal in a certain position of the system.
  • Page 22 2. Identification criteria for the bright spot and dark spot of the LCD screen Quantity allowed Distance between two spots Category Criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright ≥15mm spot...
  • Page 23 3. Troubleshooting guide Connect the power Check Power supply, check if 50V_IN (X14 pin9) on 55# board is normal, the voltage of X6 pin8 on A red indicator lights? main board is normal. IR board has problem. Yes, turn the unit on Check STANDBY, check if 5V_IN is normal A blue indicator lights? Check the voltage of backlight board, other voltages...
  • Page 24 3.1 No raster, no picture and no sound No raster, no picture and no sound Is the power indicator lights? Is the blue indicator Check the input voltage lights? Normal Abnormal Check STANDBY, Check the output of Disconnect the power supply board check if 5V_IN is DC-DC main...
  • Page 25 3.2 No picture but with sound (blue screen and OSD appear) The I2C communication of EEPROM N35 made a mistake. Note: Please refer to checking procedure (5) to get the methods for checking the phenomenon of no picture but with sound of HDMI channel 3.3 No picture but with sound (only backlight lights up) Sound only with raster Check if the power supply of...
  • Page 26 3.4 No sound but with picture No sound but with picture Check if X709of 55# has output Speaker fails to work Check if corresponding pins of power amplifier have output Check periphery circuit Check there have signals power amplifier’s inputted from C801 and C803 to back level power amplifier Check if corresponding...
  • Page 27 3.5 A certain channel fails to work properly a) AV/S-terminal with no picture Check if R713 or R714 has input signal Check the signal source Check if C19, C23(sub) or C272, C271(main) have input signal Check periphery circuit of Check each channel between N37(sub) or N2(main) and socket and N37 or N2.
  • Page 28 c) D_Sub with no picture Check if R34, R35, R36 has signal Check the signal source Check if C260 input signal Check signal Refer to (3) checking channel procedure d) YPbPr with no picture Check if the socket on main board has input signal Check if N2 has input signal Check the signal source...
  • Page 29 e) HDMI with no picture Check if the mode is correct or Check if the socket has signal Select the mode of identifiable Check the signal source Check Check N22 and its signal output peripheral circuit Refer to (3) checking If R196 has output Check N23 and its procedure...
  • Page 30 g) HDMI with no sound Check if R187 3pins output square-wave, and check if G4 outputs signal normally. 3.5 Abnormal picture a) A certain differential wire pair of LVDS of X50 (RX0+/-, RX1+/-, RX2+/-, RX3+/-) is abnormal, which may lead to lack of color or color splash. b) The DDR matching resistor row of N2 is rosin joint, which may lead to lack of color or color splash.
  • Page 44 APPENDIX-A: Main assembly NAME MAIN COMPONENT AND it’S NO. High frequency board 667.47FE27-55 N705 MSP4440G (353.44400-20) N709 TPA3008D2 (353.30080-10) N717 T312 (353.03120-10) Main board 667.3FE27-01 TVP5147M1 (353.51470-30) PW328 (353.03280-30) PMW2000 (353.20000-10) SiI9011M (353.90110-10) Keypad board 667.42FE32-05 IR board 667.42FE32-09 Power supply board 667.42FE17-20 Remote control 301.D42FB6-06...
  • Page 45 603-L42FE32-10 Ver.1.1...