XOCECO LC-32U26 Service Manual Download Page 22 | Manualshive

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20

3.2. Raster, but no picture

Check if the unit button
and remote control
operation?

Check if the all
channels have signal?

Replace CPU
board

Enter factory-menu,
initialization EEPROM,
then turn off the TV,
turn on again, display
picture?

Adjust CPU board

again

Which is no signal

of channels

Replace
CPU board

Check if 1VPP signal
and noise wave of X2
(PIN 1) in the TV
board?

Check if output
IF signal of
TUNER1 (pin
11) is normal?

Replace

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

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Summary of Contents for LC-32U26

Page 1: ...LCD TELEVISION LC 32U26 ...

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 views 1 3 6 7 8 15 16 22 ...

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: ...t should be done under nature picture mode 3 1 Initialization Enter factory menu select Factory settings sub menu and adjustment for items of table1 Table1 sub menu adjustment Items Range Introduce PW on LOGO ON OFF Display 5s LOGO of turn on the TV NO Sig LOGO ON OFF If display LOGO in no signal Black Screen BLUE BLACK If display blue screen and white noise wave in no signal setting BLUE Check DD...

Page 6: ...balance preset value of offset_R offset_G and offset_B to 125 and preset value of gain R gain G and gain B to 100 Adjustment for brightness let the second level brightness be 3nit at least c Fixed value of offset_B adjust offset_R and offset_G let the color coordinate of the second level be 285 and 293 and its brightness be 4 5nit more or less it can not 3 5nit at least Fixed value of gain_B adjus...

Page 7: ...cond bright to 3nit at least b Fixed value of offset B to 15 adjust offset_R and offset_G let the color coordinate of the second level be 285 and 293 and its brightness be 4 5nit more or less it can not 3 5nit at least Fixed value of gain_B to 25 adjust gain_R gain_G and gain_B let the color coordinate of seventh level be 285 and 293 Adjustment offset_R offset_G gain_R and gain_G repeatedly until ...

Page 8: ...ected to HDMI interface through the use of a passive cable converter The main chip N101 MST6151 a multifunctional large scale specified integrated circuit board it has many kinds of function such as A D and D A transformation interleaved line by line processing mode transformation low voltage differential output processing etc then output four couples differential signal and one couple clock signa...

Page 9: ...DVI HDMI A L R BUS SCALER A D D A DEINTERLACER LVDS HDMI N101 CPU board MST6151DA VIDEO DECORDER N601 TVP5160 MCU N801 MM502 SDRAM N201 SDRAM N202 AUDIO PROCESSOR N801 MSP3425G AUDIO AMP N401 TPA3008D2 EEPROM N802 EEPROM N803 AUDIO SW NA02 HEF4052 IF AMP N101 TV board M52760E TUNER SAW Z103 SAW Z102 SPEAKER PANEL DAC NA01 CS4340 AUDIO SW N701 HEF4052 ...

Page 10: ...ilter is 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 comp...

Page 11: ...9 ...

Page 12: ...10 ...

Page 13: ...stics of DG DP 920kHz beat and cross color Dynamic AGC realizes high speed response with only single filter Video IF and sound IF signal processings are separated from each other VCO output is used to obtain intercarrier This PLL SPLIT method provide good sound sensitivity and reduces buzz As AFT output voltage uses the APC output voltage VCO coil is not used Audio FM demodulation uses PLL system ...

Page 14: ...t 18 VGA 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 15: ...13 4 MSP3425G ...

Page 16: ...14 5 TPA3008 FUNCTIONAL BLOCK DIAGRAM 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 17: ...15 Wiring diagram Panel TV board CPU board main board Power supply board AV out board Speaker X903 X904 X2 X3 X8 X1 X10 X7 X2 X6 ...

Page 18: ...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 19: ... 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 20: ...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 21: ... board 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 PIN7 of X501 in CPU board is high level Check power supply board Check back light board yes no no red blue no yes Replace N801 no yes ...

Page 22: ...PROM then turn off the TV turn on again display picture Adjust CPU board again Which is no signal of channels Replace CPU board Check if 1VPP signal and noise wave of X2 PIN 1 in the TV board Check if output IF signal of TUNER1 pin 11 is normal Replace 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 23: ...tage of N401 is normal Check power supply Check PIN26 and PIN27 output wave of N801 Check PIN13 output wave of N101 Check PIN5 wave of Z102 Check PIN11 wave of TUNER1 Replace N401 Replace N801 Replace N101 no yes no yes yes yes no no Replace TUNER1 no ...

Page 24: ...AV OUT board ...

Page 25: ...key board ...

Page 26: ...32 power board ...

Page 27: ...IR board ...

Page 28: ...MCU CPU board page1 of 8 ...

Page 29: ...LVDS BK CPU board page2 of 8 ...

Page 30: ...POWER CPU board page3 of 8 ...

Page 31: ...SDRAM CPU board page4 of 8 ...

Page 32: ...TVP5160 CPU board page5 of 8 ...

Page 33: ...YPbPr AUDIO SWITCH CPU board page6 of 8 ...

Page 34: ...CPU board page7 of 8 ...

Page 35: ...CPU board page8 of 8 ...

Page 36: ...video board page1 of 2 ...

Page 37: ...video board page1 of 2 ...

Page 38: ...0 TPA3008D2 353 30080 10 CPU board 667 L32U18 56D N101 N601 NA01 N801 MST6151DA 353 61510 10 TVP5160 353 51600 10 CS4340 353 43400 30 MM502 353 05020 10 Audio switch board AV output board 667 L32U25 15 Keypad board 667 L32U26 05 IR board 667 L32U26 09A Power supply board 667 L32U26 20 Remote control 301 RL27U6 32MB RC R32M 0B Panel 335 32017 00 V320B1 L04 ...

Page 39: ...1 2 3 4 5 6 7 8 9 11 12 10 13 14 15 19 20 21 22 16 17 18 33 32 31 30 29 28 27 26 25 24 23 34 APPENDIX Exploded view LC 32X26 ...

Page 40: ...er box 2 15 615 20558 00 Speaker box assy 16 button board assy 17 870 30239 120 SIDE Button bracket 18 808 60947 3C1 Buttonbaffle 19 780 G26WH 120 Rear cabinet 20 808 10966 120 Rear cabinetCover 1 21 615 10649 00 Stand assy 22 808 10967 120 Rear cabinetCover 2 23 870 10411 00 trans connector 24 870 1A408 00 crystal frame right 25 863 6A189U000 Power board frame 26 870 10407 00 crystal frame middle...

Page 41: ...603 L32U260 18 Ver 1 0 ...

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