Sanyo LCD-22XR7S Service Manual Download Page 18 | Manualshive

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3. TDA4470

The TDA4470 is an integrated bipolar circuit for multi-standard video/sound IF(VIF/SIF) signal
processing in TV/VCR and multimedia applications. The circuit processed all TV video IF signals
with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM,
FM/NICAM sound IF signals.

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Summary of Contents for LCD-22XR7S

Page 1: ......

Page 2: ...instructions Method of software upgrading Working principle analysis of the unit Block diagram IC block diagram Wiring diagram Troubleshooting guide Schematic diagram APPENDIX A Assembly list APPENDIX B Exploded View 1 3 6 12 13 14 18 19 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: ...20 85 Scope for storage 10 90 2 13 Display of a fixed picture for a long time may result in appearance 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 dis...

Page 5: ...4 75 5 5V 0 H LC 32HUXX 8 55 9 45V 0 4 85 5 36V 0 11 4 12 6V 0 4 85 5 36V 0 H Test the pin voltage of XS16 the data is shown in table2 Table2 voltage data of XS16 Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 LC 26HUXX 0 4 75 5 5V 0 8 55 9 45V 0 30 4 33 6V LC 32HUXX 0 4 85 5 36V 0 8 55 9 45V 0 31 36 32 64V Test the pin voltage of XS11 the data is shown in table3 Table3 voltage data of XS11 Pin1 Pin2 Pin3 Pin4 Pin...

Page 6: ...on 0 no LOGO display ADC PRESCALE 046 Software will preset the data according unit SIF PRESCALE 02E Software will preset the data according unit BACK LIGHT FF Software will preset the data according the type of panel ALL COLOR 1 1 white balance of each channel auto offset based on the HDMI white balance 0 white balance of each channel adjust the offset base separately Note don t set ALL COLOR to 1...

Page 7: ...PAT976 include black white bars Enter ADC ADJ submenu select AUTOTUNE and wait for OK display Input PAT920 8 gray levels check if the white balance is normal if not set ALL COLOR to 0 and fine adjust according the method of 4 4 1c c Input AV signal PM5518 8 gray levels NTSC to VIDEO1 terminal check if the white balance is normal if not set ALL COLOR to 0 and fine adjust according the method of 4 4...

Page 8: ...ware Method of software upgrading 1 The tools and software demanded 1 Please confirm that PC has the software of ISP_TOOL and install the parallel interface drive program Port95nt 2 ISP_TOOL icon is bellow 3 One parallel cable 25 pins and one VGA cable 15 pins the parallel cable connects the PC and the upgrade instrument the VGA cable connects the TV and the upgrade instrument 2 The steps for upgr...

Page 9: ...press enter Note if it appears error check the connection wires and check if ISP item of the factory menu is set to 1 if not please set it to 1 4 After connection is done it needs to read the Binary document Press Read as shown below 5 Search the document needed to write in the Read check box ...

Page 10: ...8 6 Select the document then the window will appear as shown below Select ...

Page 11: ...9 7 Press Auto to select the writing function ...

Page 12: ...e b Program c Exit ISP d Erase Device e File Area 8 Press Run to begin the writing program wait till the blue bar is complete After writing it will display OK If there is error appeared shown as below press Run again to rewrite the program till it is success ...

Page 13: ... writing process Note2 the writing speed can be adjusted as shown below Select Config then adjust Speed BAR the value is bigger the speed is faster But it is easier to appear error when increase the speed so it need to select a suitable speed according the PC Step 1 Step 2 ...

Page 14: ...Video signals of VGA and HDMI will be sent to MST9E19B too Video signal of YPbPr and Video RGB of SCART1 via video switch N5 PI5V330 will be sent to MST9E19B Video signal V CVBS of SCART1 YPbPr L R and SCART1 L R will be sent to MST9E19B The main IC NS2 MST9E19B is a high performance and fully integrated IC which can realize video demodulating video switch selection A D and D A conversion interlac...

Page 15: ...1 L R L R VGA L R YPbPr L R TUNER TV SIF TV V SCART1 V OUT TV L R SCART1 L R OUT HDTV SW PI5V330 LCD TV CONTROLLER MST9E19B AUDIO AMP TDA7266SA EEPROM FLASH PANEL SPEAKER EDID 24C02 IF AMP TDA4470 POWER MEG ATMEG8L 2 AMP SAW PRE AMP PRE AMP LM358D EDID 24C02 ...

Page 16: ...ADC PLL an integrated DVI HDCP HDMI receiver a multi standard TV video and audio decoder a video de interlacer a scaling engine the MStarACE 3 color engine an on screen display controller an 8 bit MCU and a built in output panel interface To further reduce system costs the MST9E19A also integrates intelligent power management control capability for green mode requirements and spread spectrum suppo...

Page 17: ...15 2 TDA7266SA The TDA7266SA is a dual bridge amplifier ...

Page 18: ... for multi standard video sound IF VIF SIF signal processing in TV VCR and multimedia applications The circuit processed all TV video IF signals with negative modulation e g B G standard positive modulation e g L standard and the AM FM NICAM sound IF signals ...

Page 19: ...17 ...

Page 20: ...18 Wiring diagram main board power board speaker key board IR board pin pin pin pin pin back light ...

Page 21: ...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 22: ... 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 23: ... Check 5V STANDBY circuit of power supply board Press POWER button on the unit or sensor control and check the indicator Check if the PIN9 10 of XB1 on main board is high level Check if the PIN11 of XB1 on main board is high level Check power supply board Check back light board yes no no red blue no yes Replace NS2 no yes Check N801 and its peripheral circuit ...

Page 24: ...t main board again Which is no signal of channels Replace main board Check if 1VPP signal and noise wave of TP1 on the TV board Check if output IF signal of TUNER1 pin 11 is normal Check TUNER1 and its periphery Check N3 and its periphery no yes yes VGA SCART CVBS HDMI TV yes no no no yes Does display OSD menu in screen when press menu button yes no yes no Check if N5 output signal Replace main bo...

Page 25: ... normal Check power supply Check the wave of PIN4 12 of NV1 Check PIN24 wave of N3 Check PIN11 wave of TUNER1 Check TUNER1 and its periphery Check NV1 and its periphery Check NS2 and its periphery Check N3 and its periphery no yes no yes yes yes no no ...

Page 26: ...main board ...

Page 27: ...main board ...

Page 28: ...main board ...

Page 29: ...main board ...

Page 30: ...main board ...

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Page 32: ...back light board ...

Page 33: ...E19B 5270919002 TDA7266SA 5267266001 Key board XI6HU0090510 IR board XI6HE0060910 Power board XI6HU0042010 Backlight board XI6LY01214B0 Remote control XI6010Y03507 Panel XI5203227201 APPENDIX A Main assembly LCD 22XR7S MAIN COMPONENT AND IT S NO RC Y35 0F CLAA220WA01 ...

Page 34: ...APPENDIX B Exploded view LCD 22XR7S ...

Page 35: ...IR board 3 Key board 4 Panel 5 Power board 6 Back light board 7 Back cabinet 8 Stand 9 Back cabinet baffle 10 Digital processing board 11 AV baffle board 12 Speaker 13 User manual 14 Remote Control PART LIST OF EXPLODED VIEW LCD 22XR7S ...

Page 36: ...oard 1 6 XI6LY01214B0 Backlight board 1 7 XI5HK37WH030 Back cabinet 1 8 XI6151084300 Stand 1 9 XI5830110020 Back cabinet baffle 1 10 XI6HA0066910 Digital processing board 1 11 XI5810059710 AV baffle board 1 12 XI5500806004 Speaker 2 13 XI5944032900 User manual 1 14 XI6010Y03507 Remote Control 1 RC Y35 0F Only the parts in above list are used for repairing Other parts except the above parts can t b...

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