Read Sharp 56FW-53H Service Manual online
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 2 of 80
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
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