XOCECO LC-23Y18 Service Manual Download Page 2

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CONTENTS

Safety instructions………………………………………………………………………..…

Adjustment instruction …………………………….…….…………………………….…

Trouble shooting ……………………………………………………….……………………

Method of software upgrading ………………………………………….…….……………

The unit working principle analysis……………………………….………….………….

Block diagram…………………………………..………………………………..…………

IC block diagram………………………………………………………………………..……

Identification criteria for the bright spot and dark spot of the LCD screen………..….

Wiring diagram ……………………………………………………………..……………...

Troubleshooting charts………………………………………………………………..……

Schematic diagram ……………………………………………………………….…..

APPENDIX-A: Exploded View

APPENDIX-B: Main assembly list

Summary of Contents for LC-23Y18

Page 1: ...LCD TELEVISION LC 23Y18 America...

Page 2: ...grading The unit working principle analysis Block diagram IC block diagram Identification criteria for the bright spot and dark spot of the LCD screen Wiring diagram Troubleshooting charts Schematic d...

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 mod...

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...

Page 5: ...voltage to be 12v and 5v 3 3 main board adjustment 3 3 1 IF amplifier adjustment a Turn off the J201 J202 J203 J204 J205 and J5 input 38MHz PAL SYSTEM and 45 75MHz N Write memory N300 and N400 To pro...

Page 6: ...nate 0 293 0 008 g Repeat e step to f step it must be measure a true value h The unit without VGA interface of 20 N system you should be rework c step enter VIDEO channel input Gray H 16 for NTSC syst...

Page 7: ...electrical connector or the antenna Check if the antenna is properly connected Fringe in picture Check if the antenna is correctly oriented Maybe there is electric wave reflected from hilltop or buil...

Page 8: ...system Picture is whitish or too bright in the darkest area of the picture Check if the setting for the brightness is too high Possibly the brightness grade of DVD player broadcaster is set too high N...

Page 9: ...board especially for Y main board The steps for updating software 1 Install Gprobe 5 0 The first Double click the GProbe5 1 0 0 15_S0006 EXE 09A to install it According to the prompt of Windows and f...

Page 10: ...VGA cable connect the other end to the VGA interface of the LCD 6 Turn on the LCD 7 Run Gprobe5 Click the icon of Set the Device to Parallel The click the item of Delays and Buffer Size Set Long to 50...

Page 11: ...just need to click the pull down menu to select the desired Batch file and execute it in the following screen Note Do not cut off the power or turn off the unit during the burning process or the flash...

Page 12: ...sent to FLI8125 directly For the NTSC system when the RF signal is input to the NTSC tuner the turner generates IF signal Then the IF signals goes through the pre amplifying circuit and 45 75M SAW th...

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

Page 14: ...e inner IC block diagram and function 1 Inner block diagram of M52760 IF signal processing IC AFT QIF VIDEO OUT Descriptions of the pins Pin Description Pin Description 4 5 VIF input 13 QIF OUT 7 1ST_...

Page 15: ...13 2 Inner block diagram of LA72700 stereo decoder...

Page 16: ...multi channel selector HEF4052BT while the audio signal from the AV inputs is sent to R2S15900SP directly After the processing of bass treble balance and AVL by R2S15900S all these processed audio sig...

Page 17: ...15 5 Inner block diagram of TPA1517 6W stereo audio amplifier...

Page 18: ...D_SEL_1 10 RESETn Reset 52 AUD_SEL_2 15 XTAL Resonator output 63 PBIAS Panel s oblique line control 16 TCLK Basic clock 64 PPWR Backlight adjustment 24 SCL_RS232 SCL_RS232 90 DEN Display data 25 SDA_R...

Page 19: ...mm 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 Definiti...

Page 20: ...18 Wiring diagram Button board B Button board A Right speaker Left speaker Back light board Power board Main board indicator light board...

Page 21: ...ainboard Vcc 18V X702 1 2 12V 3 4 GND 5 6 18V 7 8 GND 9 PBIAS 10 PWM 1 No raster no picture and no sound When the main power is turned on the unit s indicator lights up in red red indicator is control...

Page 22: ...ent from the actual frequency Connect the signal cable manually adjust the frequency to conform to the actual frequency Enter into service menu check AFT value should be about 1 6V If the difference i...

Page 23: ...ce D502 Check whether pin1 of N501 has wave Replace N502 Check whether N502 is damaged Replace N505 Check whether N505 is damaged Check whether N505 D507 is damaged Replace the damaged parts Y Y Y N Y...

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Page 31: ...APPENDIX A Exploded View...

Page 32: ...een 15 804 20429 00 Connecting board 16 360 30042 00 Power switch 17 870 10285 00 Power supply socket bracket 18 870 3A189 AF0 USB bracket 19 780 U18W1 AW0 Front cover 20 808 2C331 00 ACTIVE panel 21...

Page 33: ...A remote control 615 10629 01 Stand assy GZ 2323S 615 20506 01 Bottom speaker assy 667 LUY25 01U Main board assy 667 L23S18 09 Infrared receiving board assy 667 L23Y18 05A Button board assy 667 L23Y18...

Page 34: ...603 L23Y180 10 America Ver 1 0...

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