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DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 1 of 80
DA100 (50Hz) and
DA50W Chassis
Repair Notes
Revision 3 – May 2003
Alan van Winkelen
Sharp Electronics (UK) Limited - May 2003
Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes
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Sharp Electronics (UK) Limited - May 2003
Revision 3
Contents
Contents ..........................................................................................2
Figures............................................................................................5
Introduction......................................................................................7
Product Specifications...........................................................................8
IC Identification.................................................................................9
Note 1 – EPROM Types and Versions........................................................................... 10
FW Models............................................................................................................................................................................... 10
28HW53H and 32HW53H:.................................................................................................................................................. 10
GF Models.................................................................................................................................................................................11
28HW53H and 32HW53H:.................................................................................................................................................. 10
GF Models.................................................................................................................................................................................11
Note 2 - Second NVM Fitting .................................................................................. 11
Note 3 IC1801 Types ........................................................................................... 11
Note 4 – IC801 Types........................................................................................... 11
Dolby Pro Logic PWB............................................................................................. 12
Note 3 IC1801 Types ........................................................................................... 11
Note 4 – IC801 Types........................................................................................... 11
Dolby Pro Logic PWB............................................................................................. 12
Power Supply ................................................................................... 13
Power Supply Lines ............................................................................................... 14
Circuit Operation ................................................................................................. 15
Figure 6: Q701 Gate Waveform ................................................................................ 16
Standby Power Supply ........................................................................................... 17
Degauss Circuit ................................................................................................... 18
+5V Supply Generation........................................................................................... 19
+3.3V Supply Generation ........................................................................................ 19
Overriding the Power Supply Control ........................................................................... 20
Power Factor Correction Circuit................................................................................. 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left) ........................... 22
Faults in the Power Supply ...................................................................................... 23
Circuit Operation ................................................................................................. 15
Figure 6: Q701 Gate Waveform ................................................................................ 16
Standby Power Supply ........................................................................................... 17
Degauss Circuit ................................................................................................... 18
+5V Supply Generation........................................................................................... 19
+3.3V Supply Generation ........................................................................................ 19
Overriding the Power Supply Control ........................................................................... 20
Power Factor Correction Circuit................................................................................. 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left) ........................... 22
Faults in the Power Supply ...................................................................................... 23
High HT....................................................................................................................................................................................23
No Operation ..........................................................................................................................................................................25
Other Problems in the Power Supply.................................................................................................................................25
No Operation ..........................................................................................................................................................................25
Other Problems in the Power Supply.................................................................................................................................25
Horizontal Stage............................................................................... 26
Focus Modulation (66cm and 76cm models only) ............................................................... 29
Circuit Operation ...................................................................................................................................................................29
Faults in the Horizontal Stage .................................................................................. 31
Horizontal Output Transistor Failure............................................................................................................................... 31
Horizontal Drive Problems................................................................................................................................................... 31
Large Picture........................................................................................................................................................................... 31
Horizontal Drive Problems................................................................................................................................................... 31
Large Picture........................................................................................................................................................................... 31
East/West Circuit ............................................................................. 32
Circuit Operation ................................................................................................. 32
DA100 (50Hz) and DA50W Chassis – Repair Notes
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Sharp Electronics (UK) Limited - May 2003
Control and Communication .................................................................... 50
Revision 3
Faults in the East/West Circuit................................................................................. 35
CRT PWB ....................................................................................... 36
Faults on the CRT PWB.......................................................................................... 36
Class D Output Stages ........................................................................ 37
Pins 8 and 9 – Frequency ......................................................................................................................................................37
Pin 12 – Standby/Mute Control Pin ....................................................................................................................................37
Pin 12 – Standby/Mute Control Pin ....................................................................................................................................37
Vertical Stage ................................................................................. 38
Circuit Operation ................................................................................................. 38
Vertical Fly-Back ................................................................................................ 38
Faults in the Vertical Stage..................................................................................... 42
Vertical Fly-Back ................................................................................................ 38
Faults in the Vertical Stage..................................................................................... 42
Audio ........................................................................................... 43
On Board Circuit Operation ..................................................................................... 43
Mute Circuit Operation ........................................................................................................................................................43
Centre Speaker PWB ............................................................................................................................................................44
Faults in the Audio Circuit...................................................................................................................................................45
Centre Speaker PWB ............................................................................................................................................................44
Faults in the Audio Circuit...................................................................................................................................................45
Dolby Pro-Logic Circuit Operation .............................................................................. 47
Faults in the Dolby Pro-Logic Circuit ................................................................................................................................49
Communication Lines.............................................................................................. 50
Parallel Bus ..............................................................................................................................................................................50
I2C Bus.....................................................................................................................................................................................50
M3 Bus......................................................................................................................................................................................50
Slave ......................................................................................................................................................................................... 51
Reset In ................................................................................................................................................................................... 51
Reset Out (1)........................................................................................................................................................................... 51
Reset Out (2).......................................................................................................................................................................... 51
I2C Bus.....................................................................................................................................................................................50
M3 Bus......................................................................................................................................................................................50
Slave ......................................................................................................................................................................................... 51
Reset In ................................................................................................................................................................................... 51
Reset Out (1)........................................................................................................................................................................... 51
Reset Out (2).......................................................................................................................................................................... 51
Reset Operation .................................................................................................. 51
Protection - Microprocessor..................................................................................... 52
Protection - Microprocessor..................................................................................... 52
Audio Output...........................................................................................................................................................................52
Beam Current ..........................................................................................................................................................................52
Horizontal Mute .....................................................................................................................................................................52
Beam Current ..........................................................................................................................................................................52
Horizontal Mute .....................................................................................................................................................................52
AV Link............................................................................................................ 53
Faults Connected with the Microprocessor ..................................................................... 53
EPROM’s and NVM’s.............................................................................................. 54
Blanking the NVM ................................................................................................ 54
NVM Programming Jig ........................................................................................... 55
Faults Connected with the Microprocessor ..................................................................... 53
EPROM’s and NVM’s.............................................................................................. 54
Blanking the NVM ................................................................................................ 54
NVM Programming Jig ........................................................................................... 55
Video and Synchronisation Processor......................................................... 56
Analogue Front End .............................................................................................. 56
Input Selector.................................................................................................... 57
Clamping........................................................................................................... 57
Automatic Gain Control .......................................................................................... 57
Input Selector.................................................................................................... 57
Clamping........................................................................................................... 57
Automatic Gain Control .......................................................................................... 57
DA100 (50Hz) and DA50W Chassis – Repair Notes
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Sharp Electronics (UK) Limited - May 2003
Revision 3
Analogue to Digital Converters .................................................................................. 57
Digitally Controlled Clock Oscillator ............................................................................ 57
Analogue Video Output........................................................................................... 57
Average Beam Current Limiting ................................................................................. 57
Protection Circuitry .............................................................................................. 57
Scan Velocity Modulation Output ............................................................................... 58
Protection – Video/Sync Processor.............................................................................. 58
Digitally Controlled Clock Oscillator ............................................................................ 57
Analogue Video Output........................................................................................... 57
Average Beam Current Limiting ................................................................................. 57
Protection Circuitry .............................................................................................. 57
Scan Velocity Modulation Output ............................................................................... 58
Protection – Video/Sync Processor.............................................................................. 58
Safety.......................................................................................................................................................................................58
Vertical Protection (VPROT)...............................................................................................................................................58
Vertical Protection (VPROT)...............................................................................................................................................58
Faults Connected to the VDP.................................................................................... 59
Picture Rotation................................................................................ 60
Circuit Description ............................................................................................... 60
Scan Velocity Modulator ...................................................................... 61
Circuit Description ............................................................................................... 61
Faults in the Picture Rotation and Scan Velocity Modulator Circuit ......................................... 62
Faults in the Picture Rotation and Scan Velocity Modulator Circuit ......................................... 62
Preventative Maintenance ..................................................................... 63
Servicing Tips .................................................................................. 64
Error Codes....................................................................................................... 67
Part Changes ................................................................................... 68
Remote Control Battery Covers ................................................................................. 68
CRT Types ........................................................................................................ 68
CRT Types ........................................................................................................ 68
Service Mode .................................................................................. 69
Entering the Service Mode ...................................................................................... 69
Geometry Adjustments........................................................................................... 70
G2 Setting ........................................................................................................ 70
G2 Adjustment ................................................................................................... 70
Grey Scale Adjustment .......................................................................................... 71
Geometry Adjustments........................................................................................... 70
G2 Setting ........................................................................................................ 70
G2 Adjustment ................................................................................................... 70
Grey Scale Adjustment .......................................................................................... 71
Voltage Tables ................................................................................. 72
IC1001 – Microprocessor ........................................................................................ 73
IC801 – Video Sync Processor (VDP) ........................................................................... 74
IC305 – Multiple Sound Processor (MSP)....................................................................... 75
IC1801 – Cathode Drive Amplifier (CDA) ...................................................................... 76
IC301 / IC302 - Audio Amplifiers ............................................................................. 77
IC702 - Primary Control ........................................................................................ 77
IC501 - Vertical Output ........................................................................................ 78
IC1003 - NVM ................................................................................................... 78
IC2401 - Megatext.............................................................................................. 79
IC201 - IF ....................................................................................................... 80
IC801 – Video Sync Processor (VDP) ........................................................................... 74
IC305 – Multiple Sound Processor (MSP)....................................................................... 75
IC1801 – Cathode Drive Amplifier (CDA) ...................................................................... 76
IC301 / IC302 - Audio Amplifiers ............................................................................. 77
IC702 - Primary Control ........................................................................................ 77
IC501 - Vertical Output ........................................................................................ 78
IC1003 - NVM ................................................................................................... 78
IC2401 - Megatext.............................................................................................. 79
IC201 - IF ....................................................................................................... 80