XOCECO LC-27U16, Service Manual

Page 1: ...LCD TELEVISION LC 27U16 A m e r i c a ...

Page 2: ...shooting Working principle analysis Block diagram IC block diagram Main assembly Identification criteria for the bright spot and dark spot of the LCD screen Wiring diagram Troubleshooting charts Schematic diagram 1 3 6 8 9 10 22 23 24 25 28 APPENDIX Exploded View ...

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: ... to select adjustment items and press VOL and VOL to adjust value items press MENU to exit Note the white balance adjustment should be done under nature picture mode 3 1 Initialization Enter factory menu select Factory settings sub menu and adjustment for items of table1 Check DDC HDCP KEY and CPU Factory initialization setup IF channel voltage of TV and AGC voltage adjustment Support format of VG...

Page 6: ... 1280 1024 60Hz 3 3 2 Sub brightness and White balance adjustment VGA HDMI channel a Input VG 849 or VG 848 signal of VGA PROG852 640 480 75Hz and eighth level gray scale signal of PATTERN Use color analyzer CA210 to adjust sub brightness and white balance b Enter submenu of COLOR TEMP Select 9300k of color temperature set auto value of R G and B to 50 Enter submenu of white balance preset value o...

Page 7: ...ignal let the color coordinate of the second level and the seventh level 285 and 293 3 5 VIDEO channel adjustment TV VIDEO S VIDEO a Connect color bar signal of AV PM5518 NTSC eight level gray scale signal to VIDEO1 terminal enter factory menu preset value of offset_R offset_G and offset_B to 15 and gain R gain G and gain B to 25 adjust brightness let second bright to 3nit at least b Fixed value o...

Page 8: ...y to the connector There appear streaks or light color on the screen Check if interfered by other equipment and if interfered possibly by the equipment like transmitting antenna non professional radio station and cellular phone 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 i...

Page 9: ...r if the input mode is correct There appears an indication outside the receivable scope Check if the TV set can receive input signal The signal is not correctly identified and VGA format is beyond the specified scope Remote control cannot work properly Check if the batteries are installed in the reverse order Check if the battery is effective Check the distance or angle from the monitor Check if t...

Page 10: ... and HDMI send to N101 N101 MST6151 is many function big dimension integrate circuit it processed HDMI A D to DA switch interlaced and non interlaced processing model switch and low voltage difference output functions and so on it send to four ways difference signal and one way clock signal to LCD display From HDMI input to MST6151contain sound signal via processed MST6151 send to processed D A sw...

Page 11: ...A L R BUS SCALER A D D A DEINTERLACER LVDS HDMI N101 CPU MST6151DA VIDEO DECORDER N601 TVP5147PFP MCU N801 MTV412 SDRAM N201 SDRAM N202 SIF DEC N201 LA72700 AUDIO PROCESSOR N301 R2S15900SP AUDIO AMP N401 TPA3008D2 EEPROM N802 EEPROM N803 AUDIO SW NA02 HEF4052 IF AMP N101 TV M52760E TUNER SAW Z103 SAW Z102 SPEAKER PANEL DAC NA01 CS4340 HEADPHONE 9 ...

Page 12: ..._1_C VI_2_A VI_2_B VI_2_C VI_3_A VI_3_B VI_3_C VI_4_A CVBS Y CVBS C Pb CVBS C Pr CVBS Y CVBS Y Analog Front End Sampling Clock GPIO HS CS VS VBLK FID AVID XTAL1 XTAL2 DATACLK RESETB GLCO PWDN SCL SDA YCbCr Clamping AGC 2 11 Bit ADC 80 AV OUT 2 TV V input 7 AV1 V input 9 AV2 V S Y input 18 S C input 29 SDA 28 SCL 40 CLK output 43 47 50 52 CCIR656 format signal output 4 5 20 and 21 3 3V A power supp...

Page 13: ...11 M52760 2 AFT 3 AGC 4 5 picture If input 7 sound IF input 13 SIF output 10 mono sound output 18 TV VIDEO output 14 17 5V 1 power supply ...

Page 14: ...12 LA72700 5 SIF input 25 TV sound R output 26 TV sound L output 11 SDA 12 SCL 31 9Vpower supply ...

Page 15: ... H sync input 19 VGA V sync input 27 28 PB input 29 30 Y input 31 HDMI G input 32 33 PR input 54 61 CCIR656 format signal input 53 CLK input 164 171 174 4 difference signal output 160 161 1 clock signal output 188 191 HDMI sound output 200 PWW brightness control switch output 72 75 BUS parallel communication signal 49 131 195 1 8V power supply 4 17 12 109 204 66 102 3 3V power supply ...

Page 16: ...DC GND LVA0M LVA0P LVA1M LVA1P LVA2M LVA2P LVACKM LVACKP GND VDDP LVA3M LVA3P GND BYPASS GND DVI_R DVI_R GND GND DVI_G DVI_G AVDD_DVI DVI_B DVI_CK AVDD_DVI AVDD_PLL DDCD_DA GND HSYNC1 BIN1P BIN1M DVI_B GND DVI_CK REXT GND DDCD_CK AVDD_ADC VYSNC1 SOGIN1 GIN1P GIN1M RIN1P RIN1M BIN0M BIN0P GIN0M GIN0P SOGIN0 RIN0M RIN0P AVDD_ADC GND HSYNC0 VSYNC0 RMID REFP REFM VI_DATA 8 VI_DATA 9 VI_DATA 10 VI_DATA...

Page 17: ...und for Analog Blue Input from Channel 0 27 BIN0P Analog Input Analog Blue Input from Channel 0 28 GIN0M Analog Input Reference Ground for Analog Green Input from Channel 0 29 GIN0P Analog Input Analog Green Input from Channel 0 30 SOGIN0 Analog Input Sync On Green Input from Channel 0 31 RIN0M Analog Input Reference Ground for Analog Red Input from Channel 0 32 RIN0P Analog Input Analog Red Input...

Page 18: ...K Output Audio Master Clock Output 188 AUSD Output Audio Serial Data Output 4mA driving strength 189 AUSCK Output Audio Serial Clock Output 4mA driving strength 190 AUWS Output Word Select Output 4mA driving strength 191 AUMUTE Output Audio Output Mute Control 192 SPDIFO Output S PDIF Audio Output 4mA driving strength 193 AIMCK Input Audio Master Clock Input 196 AISD Input Audio Serial Data Input ...

Page 19: ... Link Positive LVDS Differential Data Output 178 LVB3M Output B Link Negative LVDS Differential Data Output 175 LVB3P Output B Link Positive LVDS Differential Data Output 174 LVBCKM Output B Link Negative LVDS Differential Data Output 177 LVBCKP Output B Link Positive LVDS Differential Data Output 176 GPO Interface Pin Name Pin Type Function Pin PWM0 Output GPO with PWM Function 4mA driving streng...

Page 20: ...203 XOUT Crystal Oscillator Output Crystal Oscillator Output 202 DDCD_DA I O w 5V tolerant HDCP Serial Bus Data DDC data of DVI port 4mA driving strength 14 DDCD_CK Input w 5V Tolerant HDCP Serial Bus Clock DDC Clock of DVI Port 15 BYPASS For External Bypass Capacitor 158 VCTRL Output Regulator Control 62 Power Pins Pin Name Pin Type Function Pin AVDD_DVI 3 3V Power DVI Power 4 10 AVDD_ADC 3 3V Po...

Page 21: ...19 Pin Name Pin Type Function Pin GND Ground Ground 1 7 13 16 35 50 64 65 80 87 103 108 114 126 132 140 155 157 159 163 172 183 184 194 205 206 ...

Page 22: ...20 R2S15900 2 input L of AV1 27 input R of AV1 3 input L of AV2 S 26 input R of AV2 S 4 input L of YPBPR VGA HDMI 25 input R of YPBPR VGA HDMI ...

Page 23: ... TV 24 input R of TV 6 output L of AVOUT 23 output R of AVOUT 11 L output 19 R output 18 SCL 17 SDA 28 9Vpower supply TPA3008 1 MUTE 3 R input 5 L input 20 17 L input 41 44 R input 15 23 33 39 and 47 18V power supply ...

Page 24: ...700 353 72700 10 R2S15900 353 15900 10 TPA3008D2 353 30080 10 CPU board 667 L27U6 56A N101 N601 NA01 N801 MST6151DA 353 61510 10 TVP5147 353 51470 10 CS4340 353 43400 30 MTV412 353 04120 10 Keypad board 667 L27U6 05 Remote control 301 CL32U16 13 Power supply board 667 L27U6 20 IR board 667 L27U16 09 Panel 335 27001 00 ...

Page 25: ...0mm 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 it is...

Page 26: ...24 Wiring diagram ...

Page 27: ...rd is normal Check STANDBY circuit of power supply board Press POWER button in the unit button and sensor control check the indicator Check if the PIN12 of X503 in CPU board is high level Check if the PIN12 of X501 in CPU board is high level Check power supply board Check back light board yes no no blue red no yes Replacing N801 no yes ...

Page 28: ...M then turn off the TV turn on again display picture Adjust CPU board again Which is no signal of channels Replacing CPU board Check if 1VPP signal and noise wave of X12 PIN 1 in the TV board Check if output IF signal of TUNER1 pin 11 is normal Replacing TUNER1 Check N101 no yes yes HDMI VGA YPRP TV yes no no no yes Does display OSD menu in screen when press submenu yes no yes ...

Page 29: ...01 is normal Check power supply Check PIN11 and PIN19 output wave of N301 Check PIN25 and PIN26 output wave of N201 Check PIN5 wave of N201 Check PIN11 wave of TUNER1 Replacing N401 Replacing N301 Replacing N201 no yes no yes yes yes no no Replacing TUNER1 no ...

Page 30: ...CPU board 1 ...

Page 31: ...CPU board 2 ...

Page 32: ...CPU board 3 ...

Page 33: ...CPU board 4 ...

Page 34: ...CPU board 5 ...

Page 35: ...CPU board 6 ...

Page 36: ...CPU board 7 ...

Page 37: ...CPU board 8 ...

Page 38: ...TV board ...

Page 39: ...KEYS BOARD ...

Page 40: ...IR board ...

Page 41: ...Power supply board of 23 and 27 ...

Page 42: ...Power supply board of 32 ...

Page 43: ...APPENDIX Exploded views LC 27U16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 17 ...

Page 44: ... B1 7 FRONT CABINET 780 X16W0JAC1 8 SPEAKER 384 41916 B0 9 SPEAKER BRACKET 870 20954 00A 10 RUBBER CUSHION 868 20453 00 11 DISPLAY SCREEN 335 27001 00 12 VIDEO PROCESSING BOARD ASSY 667 L27U6 40 13 14 POWER BOARD ASSY 667 L27U6 20 15 CPU BOARD ASSY 667 L27U6 56A 16 WALL MOUNT BRACKET ASSY 615 10482 00A 17 POWER SOCKET BRACKET 870 20955 AF0 18 LCD PANEL HOLDER ASSY 615 10490 00 19 BACK NAMEPLATE 88...

Page 45: ...603 L27U160 01 America Ver 1 0 ...