XOCECO LC-27R18 Service Manual Download Page 9 | Manualshive

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MST3383MB

CBT3257C

HDMI

VGA

YPbPr 1

YPbPr 2

TVP5160

FLI2310

GM1601/GM1501

SN74AHC14

DDR

AV/S IN 1

AV IN 2

L/R_VGA

L/R_YPbPr1

L/R_YPbPr2

AV OUT

L/R_HDMI

Tuner

TC4052

MSP3420G

SRS

Audio AMP

Head Phone

AMP

R G B

Hs Vs

Y Pb/Cb Pr/Cr

Hs Vs

Y Pb/Cb Pr/Cr

R G B

YUV_SW

YUV/VGA

L/R_

SIF

HP_SW

PANEL

INVERTER

Power Supply

BK Control

VBL

EDID

Po5V_STB,VCC,VBL

Power_ON,IR,KeyA,KeyB,Led1,Led2

Mute,HP_SW,VGA_CAB,DVI_CAB

YUV/VGA,YUV_SW,YUV/USB

Frame Buffer

Frash/ROM

Video Decoder

Deinterlacer

HDMI RX

Audio Processor

Audio Switch

LCD TV Controller

RGB Switch

24C04

24C02

HDCP KEY

SC2_OUT

DACM_L/R

SC1_L/R

SC2_L/R

SC3_L/R

SC4_L/R

ANA_IN1

EDID

24C02

CBT3257C

HDTV Switch

CBT3257C

HDTV Switch

YUV/USB

Media Player

(USB)

OPTION

SC1_OUT

EEPROM

TC4052

Audio Switch

L/R_AV1

L/R_AV2

L/R_USB

7

Block diagram

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Summary of Contents for LC-27R18

Page 1: ...LCD TELEVISION LC 27R18 America LC 32R18 ...

Page 2: ...utions Alignment instructions Working principle analysis of the unit Block diagram IC block diagram Wiring diagram Troubleshooting Schematic diagram APPENDIX A Main assembly list APPENDIX B Exploded view 1 3 6 7 8 17 18 24 ...

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: ... 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 displaying still picture in high brightness for a long time 3 Points for attention during installation 3 ...

Page 5: ...1 to 9 OPTION 2 to 5 and back light to 255 LG PANEL or 0 SHARP and CMO panel select the EEPROM initial after press the VOL Production of main board and analog board on the line Connect to central signal source check if various TV functions station skipping modulate quantity control etc check if the output of earphone and speaker are normal Combined test for general assembly Input AV S signal and H...

Page 6: ...te to 285 293 Repeat adjustment R OFFSET G OFFSET and B OFFSET item and R GAIN G GAIN and B GAIN item still two step gray to 285 293 Enter the factory menu3 cool and warm color temperature difference menu R offset D elta G offset D elta B offset D elta R Gain Delta G Gain Delta B Gain Delta 27CMO 0 1 1 0 7 22 32LG 0 0 0 0 9 26 26SHARP 1 1 1 0 11 27 Warm 32SHARP 2 3 3 0 13 25 27CMO 0 1 0 25 9 0 32L...

Page 7: ...1 48 52 S2310_Color 142 Volume_25 100 102 S2310_Contrast 120 Volume_50 114 116 S2310_Bright 133 Volume_100 123 121 Bright_Cen_Delt 0 Bright_Max_Delt 2 Cont_Cen_Delt 10 Cont_Max_Delt 12 4 Performance check 4 1 TV function Input center source signal to RF TV terminal check if the channel is leak for auto searching 4 2 AV S and YPBPR terminal Input AV S and HDTV signal check if the signal is normal 4...

Page 8: ...1601 picture processing therein YPBYP or RGB to A D conversion after it and other two signal are switched selection and digital display processing it include OSD GAMMA correction brightness and contrast processing then LVDS conversion to LCD panel display The SIF of tuner output signal to audio processing NA6 MSP3420 The audio of AV1 SVHS AV2 via switch conversion NA3 HEF4052 to MSP3420 the audio ...

Page 9: ...RTER Power Supply BK Control VBL EDID Power_ON 5V_STB VCC VBL Power_ON IR KeyA KeyB Led1 Led2 Mute HP_SW VGA_CAB DVI_CAB YUV VGA YUV_SW YUV USB Frame Buffer Frash ROM Video Decoder Deinterlacer HDMI RX Audio Processor Audio Switch LCD TV Controller RGB Switch 24C04 24C02 HDCP KEY SC2_OUT DACM_L R SC1_L R SC2_L R SC3_L R SC4_L R ANA_IN1 EDID 24C02 CBT3257C HDTV Switch CBT3257C HDTV Switch YUV USB M...

Page 10: ...ocedures in order to achieve good stereo separation for BTSC and EIA J The MSP 34x0G has optimum stereo performance without any adjustments All MSP 34xxG versions are pin compatible to the MSP 34xxD Only minor modifications are necessary to adapt a MSP34xxD controlling software to the MSP 34xxG The MSP 34x0G further simplifies controlling software Standard selection requires a single I2C transmiss...

Page 11: ...9 Fig 1 1 Simplified functional block diagram of the MSP 34x0G ...

Page 12: ...s also available On CVBS and Y C inputs the user can control video characteristics such as hue contrast brightness and saturation via an I2C host port interface Furthermore luma peaking with programmable gain is included as well as a patented color transient improvement CTI circuit Attenuation at higher frequencies or asymmetrical color subcarrier sidebands are compensated using the IF compensatio...

Page 13: ...11 INTERNAL BLOCK DIAGRAM ...

Page 14: ...e 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 to output shorts A fault terminal allows short circuit fault reporting and automatic recovery Thermal protection ensures that the maximum junction temperature is not e...

Page 15: ... backward compatible to DVI 1 0 and HDCP 1 0 MCU Interface The MST3383MB provides 2 wire serial bus for interfacing with an MCU It detects active inputs for both on line and off line operations During on line operation the MST3383MB also provides polarity and period count information of active input s DE signals The MCU can easily adjust the input mode and switch to active input properly Color Spa...

Page 16: ...ted onto a single device the gm1601H eliminates the need for several system components simplifying the design and reducing the cost of high end multimedia LCD monitors and televisions while maintaining a high degree of flexibility and quality The gm1601H is available in two silicon revisions BD and CF GM1601H CF is a backwards compatible addition that incorporates some functional and quality impro...

Page 17: ...nipulation matrix supports all color spaces RGB YPrPb 4 4 4 YCrCb 4 2 2 YCr Cb ITU R BT656 ITU R BT601 Output supports analog RGB YPrPb and YCrCb in the FLI230x and digital RGB YPrPb 4 4 4 YCrCb and 4 2 2 YCr Cb in FLI230x FLI2310 6 4 Frame Rate Conversion Tearless Frame Rate Conversion 50 60 72 75 100 120 Hz 6 5 Front End Processing Motion Adaptive Noise Reduction Improves picture quality for off...

Page 18: ...nsional non linear luma and chroma video enhancer brings out details in the picture producing a more life like image 6 9 Memory 32 bit wide SDRAM i e one 2M x 32 bit or two 1M x 16 bit controller up to 166 MHz operation for external SDRAM INTERNAL BLOCK DIAGRAM ...

Page 19: ...CPU board Supply power board Conversion board Speaker Analog board 17 Wiring diagram ...

Page 20: ...nd 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 Check to see if the power plug has been inserted properly into the socket No picture and sound 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 fron...

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

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: ...eplace CPU board Does LED flicker Replace CPU board Check the backlight socket is normal Problem LCD screen Check if the X21 pin6 and pin7 of the digital board has 24V Is 5v for X18 pin26 30 Check if between R172 and R173 connect wire has 3 3V Replace CPU board Check the pin B and pin C of V10 and V12 is normal Yes No No Yes Yes No Yes Yes No No No Yes Green Yes No change color ...

Page 24: ...U2 output 5V 12V Check FU1 Replacing N23 Does R223 and R216 R219 output signal Replacing CPU assy Replacing N34 Check the pin4 and pin8 of N24 has H V sync Check if C16 has SOG signal Check if the pin1 and pin5 of N24 has input signal Replacing N24 Check if the pin2 and pin3 of N4 has input signal Replacing N4 Check the N10 input and output Replacing CPU assy Does R70 R73 input signal Replacing N7...

Page 25: ... signal output NA6 pin27 Is the signal output TUN1 pin12 Replacing NA9 Replacing NA7 Replacing NA6 Check if the pin1 and pin2 of XA12 is 18V 24V Is high level of NA1 pin1 Check RA76 Which is high level for DA1 DA2 DA3 Replacing TUN1 Check the pin3 of X14 Check the speaker output 1 2 or 3 4 Check VA7 No No Yes Yes No No No Yes Yes Yes Yes No No No DA11 DA1 DA2 ...

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Page 37: ... L27R18 46 Trans connecting board assy 667 L27R18 53 Analog board assy 667 L27R18 56 CPU board assy 335 27001 00 Screen V270W1 L04 203 L32R180 10 301 CL37R7 090A RC C09 0A remote control INSIGNIA 615 10578 02 Stand assy DZ 2332 615 20525 AR0 Bottom speaker assy 667 L27R18 46 Trans connecting board assy 667 L27R18 53 Analog board assy 667 L32R18 05 Button board assy 667 L32R18 09 Infrared receiving...

Page 38: ...APPENDIX B Exploded View LC 27R18 ...

Page 39: ...00 AV baffle left 11 Digital processing board assy 12 808 10840 00 Button cover 13 743 1B180 00 Button decorate piece 14 Button board assy 15 615 1A526 00 LCD screen fixed mount assy 16 Screen 17 808 2A330 202 ACTIVE panel 18 780 X18W0 00 Front cover 19 Power board assy 20 Sound trans connecting assy 21 808 1A842 00 AV baffle right 22 Video processing board assy 23 Indicator assy 24 870 3A183 00 U...

Page 40: ...APPENDIX B Exploded View LC 32R18 ...

Page 41: ...connecting assy 12 870 10219 00 Mounting holder 13 808 10867 AF0 Rear cabinet USB 14 808 10865 AF0 Rear cabinet right 15 780 G18L1 AF1 Rear cabinet 16 808 10812 AF0 Power lead cover 17 615 20482 00 Bottom speaker assy 18 615 10578 00 Stand assy 19 808 10863 AF0 Speaker connecting cover 20 808 10866 AF0 Rear cabinet bottom 21 808 10864 AF0 Rear cabinet left 22 808 10859 AF0 decorate cover leftright...

Page 42: ...Ver 1 0 603 L27 32 R180 10 ...

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