XOCECO LC-23K7 Service Manual Download | Manualshive

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Summary of Contents for LC-23K7

Page 1: ...COLOR TELEVISION LC 23K7 ...

Page 2: ...od of software upgrading LC 23K7 working principle analysis LC 23K7 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 5 7 9 10 11 17 18 19 20 23 ...

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: ...nal then select the mode item after that you can press enter to select three kinds of color temperature namely 6500K 9300K and 12000K press MENU to exit Note the white balance adjustment should be done under nature picture mode Check DDC HDCP KEY and FLASH To produce CPU board and analog board Check the CPU board and analog board All testing Connect with central signal source then check each funct...

Page 6: ... two levels gray scale be 308 and 316 Select 9300k of mode adjustment offset_R offset_G and offset_B let the color coordinate of the third level be 285 and 290 and its brightness be 12 5nit more or less Adjust gain_R gain_G and gain_B let the color coordinate of seventh level be 285 and 290 Select 12000k of mode adjustment offset_R offset_G and offset_B let the color coordinate of the third level ...

Page 7: ...al source and check if there are channels be skipped 4 2 AV S YpbPr terminals Input AV S HD signal check if it is normal 4 3 VGA terminal Insert VGA terminal input VGA format signal of 640 X 480 60 Hz check if the display is normal If interference exists press the auto adjust button on remote control again and check if it is normal 4 4 DVI terminal Insert DVI terminal input signal of 640 X 480 60 ...

Page 8: ...d by the red LED at the front of the TV set See if it s receiving the signal that is transmitted from other source than the station Check if it s connected to the wrong terminal or if the input mode is correct Check if the signal cable connection between video frequency source and the liquid crystal TV set is correct Deterioration of color phase or color tone Check if all the picture setups have b...

Page 9: ...ly connected or if it has received the video signal correctly Blur picture Check if the antenna cable is correctly connected Of if it has received the right video signal No sound Check if the mute audio frequency setting is selected Check if the sound volume is set to minimum Make sure the earphone is not connected Check if the cable connection is loose When playing VHS picture search tape there a...

Page 10: ... be 115200 Then select Reset Target After Download Click FLASH pushbutton it s ready to run For other settings please refer to the Fig Above already defaulted by the system normally no need to change Switch on TV set the FLASH write program begins to run After FLASH write is over push button cancel will become flash Then shut the main power supply and it s OK just switch it on again Note Do not sh...

Page 11: ...hould be sent to U12 together with he above two kinds of signal that is RGB signal of 24BIT produced by DV1 through U15 TFP403 501 do the picture format processing for the three kinds of signal in U12 Firstly do the A D conversion for RGB signal of VGA then do the switching selection together with the other two kinds of signal And then they will be converted into 1024 768 format through digital di...

Page 12: ... AV R L OUT U15 DVI DRIVER TFP501 U12 SCALER JAG ASM U29 VIDEO DECODER VPC3230 U30 ADC MST9883 U13 DEINTER LACER FLI2310 U14 SDRAM U19 SDRAM U20 SDRAM U31 LVDS DRIVER DS90C385A U3 EEPROM N201 AUDIO PROCESSOR MSP3420 N203 SRS 3D STEREO CONTROLLER M62494 VGA DV1 SPEAKER PANEL N213 N214 AUDIO AMPLIFIER MPS7720 TUNER 201 U32 CCD V CHIP Z86229 IR KEYBOAD N212 TLE2142 HEADPHONE U2 MICRO CONTROLER TSC802...

Page 13: ...ol the operation of IC 27 28 PIN output left and right sound channel R L to speaker processor 36 37 PIN AV OUT of sound R L 47 48 PIN D4 1 D4 2 PCMCIA selected input R L 50 51 PIN Input of VGA R L 53 54 PIN Input of AV1 SVHS and AV2 R L 56 57 PIN Input R L of BS 67 PIN Input TV SIF ...

Page 14: ...5 73 PIN Input Y of PCMCIA 6 PIN Input V of PCMCIA 31 34 37 40 PIN output format signal of ITU R656 70 PIN Video of AV OUT 71 PIN Input C of SVHS 72 PIN input Video SVHS in priority of Y or AV1 of SVHS 74 PIN input Video of AV2 75 PIN input Video of TV BS ...

Page 15: ...13 3 AD9883 ...

Page 16: ...14 4 FLI2310 Simplified Internal Block Diagram ...

Page 17: ...15 5 JAG ASM ...

Page 18: ...16 6 Z86229 Pins description 7 PIN VDIEO INPUT 2 PIN G OUTPUT 3 PIN B OUTPUT 18 PIN R OUTPUT 17 PIN FB OUTPUT ...

Page 19: ... ASM 353 0JAG0 00 FLI2310 353 23100 00 TFP501 353 05010 00 VPC3230D 353 32300 80 MST9883B 353 98830 10 DS90C385 353 03850 20 Z8622912SS 353 86229 10 TSC80251G2D 353 80251 10 AT49F002NT 352 49002 70 IR board 667 L27K6 09 Keypad board 667 L27K6 05 Video process board 667 L27K6 40 Power supply board 667 L23K7 20 N904 V905 H11A817 352 08170 50 SPP11N60C3 343 00600 60 Remote control RC U20R 301 UL27K6 ...

Page 20: ...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 21: ...19 Wiring diagram 667 L23K7 20 667 L23K6 56R ...

Page 22: ...f it s melted of FUSE in the power supply board Replacing power supply board Check the indicator in turn on condition Check if the indicator is flicker in the sensor control normal condition Check if the PIN12 of P29 is high level Check if the PIN26 30 of P4 is high level Check if it s melted of F3 Replacing CPU board yes no no no Non change color blue no no no yes yes no ...

Page 23: ...ower supply 5V V of video processing board Check input 24V of sound conversion board Check input 24V A of CPU board Check output 24V A of power supply board Check if PIN2 1VPP signal and noise wave of P32 Replacing TUNER202 Check if PIN56 15 734KHz sync signal of U29 Replacing U29 Display NO SIGNAL Testing 1VPP signal of TP1 TP2 TP3 Replacing CPU board Replacing U13 Testing PIN65 of U30 SYNC signa...

Page 24: ...C 12V of N213 and N214 Check power supply Check PIN5 and PIN8 output of N203 Check PIN27 and PIN28 output wave of N201 Check PIN67 wave of N201 Replacing TUNER202 Replacing N213 and N214 Replacing N203 Replacing N201 no yes no yes yes yes no no ...

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Page 29: ...L23K7 20 OLD 原理图 ...

Page 30: ...L23K7 20 NEW 原理图 ...

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