XOCECO LC-42FE32 Service Manual Download | Manualshive

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2. PWM328

Feature:

Supports V-CHIP, CCD, OSD

DEIMTERLACING

SCALING

PIP/POP

Integrated ADC, VIDEO DECODER

Block diagram is follow:

Pin descriptions:
Pin

Type

Name

Instruction

M1 PORTA0

SBBE0

M2 PORTA1

SBBE1

Enable control of bus line of bit
store

D24 ADC0

KEY1_328

C26 ADC1

KEY2_AD_IN

Button

A10

PWM0

BRIGHT

Brightness of backlight control

Description of main periphery components:
R62: amplitude adjustment of LVDS output, the resistance bigger, the LVDS amplitude smaller.
R259: DDR clock matching resistor for PWM328. in this system, DDR clock up to 180MHZ. The

resistor is 0ohm for compatible 200MHZ.

R263-R269: DDR matching resistor
R721, R724: matching resistor for HD synchronizing separator circuit
C268: isolating capacitor for SOG separator circuit of VGA signal
R478: matching resistor of SLOWBUS 50MHZ clock signal

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Summary of Contents for LC-42FE32

Page 1: ...LCD TELEVISION LC 42FE32 ...

Page 2: ...cautions 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 1 3 7 9 10 17 19 29 ...

Page 3: ... will result 2 5 If any foreign substance such as water liquid metal slices or other matters happens to fall into the module be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit 2 6 Should there be smoke abnormal smell or sound from the module please shut the power off at on...

Page 4: ...0 85 Scope for storage 10 90 2 13 Display of a fixed picture for a long time may result in appearance of picture residue on the screen as commonly called ghost shadow The extent of the residual picture varies with the maker of LCD screen This phenomenon doesn t represent failure This ghost shadow may remain in the picture for a period of time several minutes But when operating it please avoid disp...

Page 5: ...und of AV OUT should be the picture and sound of the current channel High frequency board test Check accessories and then packing Input YPbPr YCbCr 1 2 signal and check if picture sound and analog quantity control is normal in the state of COMPONENT the picture and sound of AV OUT should be the picture and sound of the current channel FLASH write N5 N9 N13 N24 Main board test Test of Button board ...

Page 6: ...o check 4 Unit adjustment 4 1 Adjustment of unit connection Turn on the TV and check if it is normal display LOGO about 8 seconds later display picture about 12 seconds later 4 2 Aging a Turn on the TV select TV channel without signal input b Aging for an hour in the aging room 4 3 ACD calibration and White balance adjustment use CA210 VG849 generator Method of entering factory menu enter INPUT me...

Page 7: ...1 5 4 VGA terminal Input VGA signal VG849 signal generator separate input the VGA format signal of table 1 and check if the display and sound are normal If the image is slight disturb press auto correction button on the remote control and check the display Table1 PC signal format No Resolution H frequency kHz V frenquency Hz Point clock pulse frenquency MHz Remark 1 720 400 31 47 70 08 25 17 DOS 2...

Page 8: ...nput HDMI signal VG849 signal generator separate input the format signal of table 3 and table 4 Check if the image and sound is normal Input DVI signal through DVI HDMI trans connection wire input audio signal from DVI VGA AUDIO and check if it is normal Table 3 HDMI signal format No H frequency kHz V frenquency Hz Remark 1 15 735 60 SDTV 480i 2 15 625 50 SDTV 576i 3 31 47 60 SDTV 483p 4 45 00 60 ...

Page 9: ...ess then switch to RGB of 30bit output to PW328 the signal of TV1 TV2 AV1 AV2 Y C input into TVP5147 digital processing and convert into 20bit YC signal output to PW328 while digital signal of YPbPr1 YPbPr2 and VGA send straight to PW328 The differential signal of HDMI 1 and HDMI 2 via HDMI receiver SIL9011 after demodulate 30bit RGB signal output to PW328 too The all signal input into PW328 digit...

Page 10: ... PWM2000 via 3257 select after it send to MSP4440G while the data D1 and D2 of HDMI and PWM2000 send straight to MSP4440G IIS and the audio signal of each channel are demodulated in MSP4440G then sent to TPA3008 amplify and output The audio signal of TS stream may be demodulated and converted into SPDIF to output in PWM2000 at the same time Audio out Tuner 2 Tuner 1 AV 1 AV 2 YPBPR 1 VGA YPBPR 2 M...

Page 11: ...ds Panel I2C 20BIT Y C 30bit RGB TVP5147 DECORDER SII9011 HDMI receiver 30BIT RGB TUNER1 TUNER2 MSP4440 Sound processor TPA3008 Sound amplify NJM1109 Earphone amplify AV1 S AV2 YPrPb1 YPrPB2 PIV331 VGA Earphone PIV331 TS ATMEGA8L IR Key T312 RS 232 Video signal Audio signal I O signal Digital audio signal HD signal Digital signal Note Block diagram 9 ...

Page 12: ... of signal AK10 IRQ0 INTENETn Net adjustment board interrupt DEBUG emulation AK11 PIO17 VO_SEL0 AN10 PIO20 VO_SEL1 Selected video output TV1 TV2 AV1 AV2 AK13 PIO9 AUDIOSEL Select HDMI MPEG I2S output AL13 PIO8 AUDIOSEL_Y Selection of YPBPR input audio AL12 PIO11 BK_ON Backlight control 0 OFF 1 ON AK12 PIO10 LCD_ON Power supply control of panel 0 OFF 1 ON AM11 PIO15 HOT_PLUG Hot plug control AM13 P...

Page 13: ... Brightness of backlight control Description of main periphery components R62 amplitude adjustment of LVDS output the resistance bigger the LVDS amplitude smaller R259 DDR clock matching resistor for PWM328 in this system DDR clock up to 180MHZ The resistor is 0ohm for compatible 200MHZ R263 R269 DDR matching resistor R721 R724 matching resistor for HD synchronizing separator circuit C268 isolatin...

Page 14: ...ddress 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 SII9011 Feature HDMI1 1 and DVI1 0 compatible receiver integrated HDCP1 1 Supports digital interface of all kinds this system supports 30bit RGB output Color space convert Four channels I2S outputs sampling frequency up to 192...

Page 15: ...n 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 AVC AUTOMATIC SOUND DORRECTION I2S digital audio output ...

Page 16: ... 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 BS1 BS0 CS BCLK CCLK1 CCLK2 0 0 0 74 175 20 25 ...

Page 17: ...s 8Ω The high efficiency of the TPA3008D2 eliminates the need for external heatsinks when playing music The gain of the amplifier is controlled by two gain select pins The gain selections are 15 3 21 2 27 2 and 31 8 dB The outputs are fully protected against shorts to GND VCC and output output shorts A fault terminal allows short circuit fault reporting and automatic recovery Thermal protection en...

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: ...t speaker black wire Backlight board 2 Backlight board 1 Main Board Hight frequency board Power board Backlight Board 3 Backlight Board 4 Right speaker red wire Left speaker white wire Left speaker black wire LVDS interface Backlight control lamp ...

Page 20: ...and if interfered possibly by the equipment like transmitting antenna non professional radio station and cellular phone 1 2 TV set Symptoms Possible cause Unable to switch the power on z Check to see if the power plug has been inserted properly into the socket No picture and sound z Check to see if the power supply of liquid crystal TV has been switched on As can be indicated by the red LED at the...

Page 21: ...tteries are installed in the reverse order z Check if the battery is effective z Check the distance or angle from the monitor z Check if there is any obstruct between the remote control and the TV set z Check if the remote control signal receiving window is exposed to strong fluorescence No picture and sound but only hash z Check if the antenna cable is correctly connected or if it has received th...

Page 22: ...mm 10mm 5mm Total defected point 8 7 5 4 Notes 1 Definition of defected point bright spot dark spot It is identified as a defected point if its area exceeds 1 2 of a single picture element R G B 2 Definition of bright spot It is identified as a bright spot if it is bright in the state of dark field and its bright size remains unchanged 3 Definition of dark spot It is identified as a dark spot if i...

Page 23: ...rd other voltages and the communication of PWM2000 DDR matching resistance Check if the display of each channel s video signal is normal Check if the signal inputted from the channel to pin IC is normal or IC and its periphery is normal or the output of LVDS is normal Check if the display of each channel s audio signal is normal Check if the signal inputted from the channel to pin IC is normal or ...

Page 24: ...hort to the ground open circuit or component damaged The power supply board fails to work properly Check the output of DC DC on main board Check STANDBY check if 5V_IN is normal Check if there are short or open circuits on correlative circuits Check if the voltages of correlative circuits on high frequency board are normal There are short or open circuits on correlative circuits Print track inform...

Page 25: ... 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 panel is normal or not Check the signal outputted from N2 to X8 is normal or not LVDS receiver board has problem Check the power supply and the periphery circuit of N2 Check pin 5 of N26 is 18V or not Check N26 and its periphery circuit Normal Abnormal Normal A...

Page 26: ...amplifier s back level Check if there have signals inputted from C801 and C803 to power amplifier Check periphery circuit of power amplifier power supply circuit and circuit of pin MUTE Check if corresponding channels of N705 have input signal Check periphery circuit of N705 crystal oscillation and power supply Follow the direction of audio signal input to check each channel Yes No Yes No Yes No Y...

Page 27: ...gnal Check the signal source Check each channel between socket and N37 or N2 Check periphery circuit of N37 sub or N2 main and power supply circuit Yes No Yes No Check if 55 R845 main or R807 sub has output signal Check if C22 sub or C262 main has input signal Check periphery circuit of T700 sub or T740 main and power supply Check N37 and its periphery circuit then refer to 3 checking procedure Ch...

Page 28: ...the signal source Yes No Yes No Check the signal channel Refer to 3 checking procedure Check if the socket on main board has input signal Check if N2 has input signal Yes No Check the signal source Yes No Check the channel between the socket and N2 Check N2 and its periphery circuit then refer to 3 checking procedure ...

Page 29: ...ignal output Yes No Check N22 and its peripheral circuit If R196 has output Check if power supply of T702 and N717 is normal Check if R821 has TS signal Check the corresponding power supply circuit Yes No Yes No Check if the connection of X711 X741 is normal Check if C936 and C937 output 44MHZ signal Yes No If it receives NTSC signal normally ATSC signal intensity is lower than the reception inten...

Page 30: ...f 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 ...

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Page 44: ...3 44400 20 TPA3008D2 353 30080 10 T312 353 03120 10 Main board 667 3FE27 01 N37 N2 N3 N23 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 RC D06 Panel 335 42022 00 V420H1 L05 ...

Page 45: ...603 L42FE32 10 Ver 1 1 ...

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