Read Sharp 76FW-54H Service Manual online
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 3 of 80
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
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