Sharp 66FW-54H Service Manual ▷ View online
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 5 of 80
Sharp Electronics (UK) Limited - May 2003
Revision 3
Figures
Figure 1: DA100 (50Hz) Chassis – model 56FW53H .................................................................................................................7
Figure 2: Power Supply Layout (Component Side).................................................................................................................... 13
Figure 3: Power Supply Component Locations (Print Side) .................................................................................................... 13
Figure 4: Location of Supply Measurement Points................................................................................................................... 14
Figure 5: Power Supply Schematic Diagram.............................................................................................................................. 15
Figure 6: Q701 Gate Waveform................................................................................................................................................... 16
Figure 7: Standby Power Supply .................................................................................................................................................. 17
Figure 8: Degauss Circuit .............................................................................................................................................................. 18
Figure 9: +5V Generation Circuit ................................................................................................................................................. 19
Figure 10: 3.3V Regulation Circuit............................................................................................................................................... 19
Figure 11: Location of R792 ..........................................................................................................................................................20
Figure 12: Location of R623..........................................................................................................................................................20
Figure 13: Power Factor Circuit (56FW53H)............................................................................................................................ 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left)..............................................................22
Figure 15: 56FW53H Power Factor Correction PWB..............................................................................................................22
Figure 16: Location of 56FW53H Power Factor PWB.............................................................................................................22
Figure 17: Location of D735 .........................................................................................................................................................23
Figure 18: Location of Audio Stage components (Main PWB) ...............................................................................................23
Figure 19: Location of Centre Speaker PWB ............................................................................................................................24
Figure 20: Location of Components on the CRT PWB .............................................................................................................24
Figure 21: Location of SMD Capacitor on IC708 .....................................................................................................................25
Figure 22: Horizontal Output Stage...........................................................................................................................................27
Figure 23: Location of Horizontal Stage Components ............................................................................................................28
Figure 24: Q601 Base Drive Waveform .....................................................................................................................................28
Figure 25: GF Focus Modulator Circuit ......................................................................................................................................29
Figure 26: Picture of the FW Focus Modulator PWB .............................................................................................................29
Figure 27: FW Focus Modulator Circuit.....................................................................................................................................30
Figure 28: Location of Link Wire JL2 ........................................................................................................................................ 31
Figure 29: East West Circuit .......................................................................................................................................................32
Figure 30: East/West Circuit – Print Side................................................................................................................................33
Figure 31: East/West Circuit - Component Side......................................................................................................................33
Figure 32: East/West Drive Waveform - Pin 32 of IC801....................................................................................................34
Figure 33: 66cm and 76cm CRT PWB .........................................................................................................................................36
Figure 34: 56FW53H CRT PWB...................................................................................................................................................36
Figure 35: Vertical Output Amplifier.........................................................................................................................................38
Figure 36: Vertical Fly-back Circuit ...........................................................................................................................................39
Figure 37: Vertical Protection Signal (VPROT - Pin 11 of IC801) ........................................................................................39
Figure 38: Vertical Scan Coil Waveform - Top of Coil ...........................................................................................................40
Figure 39: Vertical Scan Coil Waveform - Bottom of Coil.....................................................................................................40
Figure 40: Vertical Stage - Component Side ............................................................................................................................ 41
Figure 41: Vertical Stage - Print Side........................................................................................................................................ 41
Figure 42: Audio Amplifier Circuit (left channel)....................................................................................................................43
Figure 2: Power Supply Layout (Component Side).................................................................................................................... 13
Figure 3: Power Supply Component Locations (Print Side) .................................................................................................... 13
Figure 4: Location of Supply Measurement Points................................................................................................................... 14
Figure 5: Power Supply Schematic Diagram.............................................................................................................................. 15
Figure 6: Q701 Gate Waveform................................................................................................................................................... 16
Figure 7: Standby Power Supply .................................................................................................................................................. 17
Figure 8: Degauss Circuit .............................................................................................................................................................. 18
Figure 9: +5V Generation Circuit ................................................................................................................................................. 19
Figure 10: 3.3V Regulation Circuit............................................................................................................................................... 19
Figure 11: Location of R792 ..........................................................................................................................................................20
Figure 12: Location of R623..........................................................................................................................................................20
Figure 13: Power Factor Circuit (56FW53H)............................................................................................................................ 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left)..............................................................22
Figure 15: 56FW53H Power Factor Correction PWB..............................................................................................................22
Figure 16: Location of 56FW53H Power Factor PWB.............................................................................................................22
Figure 17: Location of D735 .........................................................................................................................................................23
Figure 18: Location of Audio Stage components (Main PWB) ...............................................................................................23
Figure 19: Location of Centre Speaker PWB ............................................................................................................................24
Figure 20: Location of Components on the CRT PWB .............................................................................................................24
Figure 21: Location of SMD Capacitor on IC708 .....................................................................................................................25
Figure 22: Horizontal Output Stage...........................................................................................................................................27
Figure 23: Location of Horizontal Stage Components ............................................................................................................28
Figure 24: Q601 Base Drive Waveform .....................................................................................................................................28
Figure 25: GF Focus Modulator Circuit ......................................................................................................................................29
Figure 26: Picture of the FW Focus Modulator PWB .............................................................................................................29
Figure 27: FW Focus Modulator Circuit.....................................................................................................................................30
Figure 28: Location of Link Wire JL2 ........................................................................................................................................ 31
Figure 29: East West Circuit .......................................................................................................................................................32
Figure 30: East/West Circuit – Print Side................................................................................................................................33
Figure 31: East/West Circuit - Component Side......................................................................................................................33
Figure 32: East/West Drive Waveform - Pin 32 of IC801....................................................................................................34
Figure 33: 66cm and 76cm CRT PWB .........................................................................................................................................36
Figure 34: 56FW53H CRT PWB...................................................................................................................................................36
Figure 35: Vertical Output Amplifier.........................................................................................................................................38
Figure 36: Vertical Fly-back Circuit ...........................................................................................................................................39
Figure 37: Vertical Protection Signal (VPROT - Pin 11 of IC801) ........................................................................................39
Figure 38: Vertical Scan Coil Waveform - Top of Coil ...........................................................................................................40
Figure 39: Vertical Scan Coil Waveform - Bottom of Coil.....................................................................................................40
Figure 40: Vertical Stage - Component Side ............................................................................................................................ 41
Figure 41: Vertical Stage - Print Side........................................................................................................................................ 41
Figure 42: Audio Amplifier Circuit (left channel)....................................................................................................................43
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 6 of 80
Sharp Electronics (UK) Limited - May 2003
Revision 3
Figure 43: Centre Speaker PWB Location................................................................................................................................44
Figure 44: Centre Speaker Circuit Diagram..............................................................................................................................44
Figure 45: Centre Speaker Modification 1 ................................................................................................................................45
Figure 46: Centre Speaker PWB Modification 2......................................................................................................................46
Figure 47: Pro-Logic PWB..............................................................................................................................................................47
Figure 48: Dolby Pro-Logic Circuit Diagram (66GF64H)........................................................................................................48
Figure 49: Dolby Pro-Logic PWB Connector ..............................................................................................................................49
Figure 50: Communication Block Diagram ..................................................................................................................................50
Figure 51: Reset Timing ................................................................................................................................................................. 51
Figure 52: Audio Protection Circuit ............................................................................................................................................52
Figure 53: Horizontal Mute Circuit.............................................................................................................................................52
Figure 54: AV Link Schematic Diagram......................................................................................................................................53
Figure 55: Internal Architecture of IC801 (VDP 3120) ........................................................................................................56
Figure 56: VDP Protection Circuits .............................................................................................................................................58
Figure 57: Position of C824 ..........................................................................................................................................................59
Figure 58: Picture Rotation Circuit (located on CRT PWB) ...................................................................................................60
Figure 59: Scan Velocity Modulator Circuit.............................................................................................................................. 61
Figure 60: SVM and Tilt Coil Connectors...................................................................................................................................62
Figure 61: CRT Base PWB Modification (66cm and 76cm sets only) ...................................................................................63
Figure 62: Fault Finding Flow Chart 1.........................................................................................................................................65
Figure 63: Fault Finding Flow Chart 2 ........................................................................................................................................66
Figure 64: LED Fault Code Table.................................................................................................................................................67
Figure 65: HW OPC LED Error Code Jig ...................................................................................................................................67
Figure 44: Centre Speaker Circuit Diagram..............................................................................................................................44
Figure 45: Centre Speaker Modification 1 ................................................................................................................................45
Figure 46: Centre Speaker PWB Modification 2......................................................................................................................46
Figure 47: Pro-Logic PWB..............................................................................................................................................................47
Figure 48: Dolby Pro-Logic Circuit Diagram (66GF64H)........................................................................................................48
Figure 49: Dolby Pro-Logic PWB Connector ..............................................................................................................................49
Figure 50: Communication Block Diagram ..................................................................................................................................50
Figure 51: Reset Timing ................................................................................................................................................................. 51
Figure 52: Audio Protection Circuit ............................................................................................................................................52
Figure 53: Horizontal Mute Circuit.............................................................................................................................................52
Figure 54: AV Link Schematic Diagram......................................................................................................................................53
Figure 55: Internal Architecture of IC801 (VDP 3120) ........................................................................................................56
Figure 56: VDP Protection Circuits .............................................................................................................................................58
Figure 57: Position of C824 ..........................................................................................................................................................59
Figure 58: Picture Rotation Circuit (located on CRT PWB) ...................................................................................................60
Figure 59: Scan Velocity Modulator Circuit.............................................................................................................................. 61
Figure 60: SVM and Tilt Coil Connectors...................................................................................................................................62
Figure 61: CRT Base PWB Modification (66cm and 76cm sets only) ...................................................................................63
Figure 62: Fault Finding Flow Chart 1.........................................................................................................................................65
Figure 63: Fault Finding Flow Chart 2 ........................................................................................................................................66
Figure 64: LED Fault Code Table.................................................................................................................................................67
Figure 65: HW OPC LED Error Code Jig ...................................................................................................................................67
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 7 of 80
Introduction
The DA100 (50Hz) chassis and its derivatives (DA50W) are fitted in many Sharp widescreen television sets.
Production started in 1999 with the FW models and continued up to the HW models. There have been a number
of changes to the circuit configuration, layout and operation but the overall circuit theory and fault finding
techniques remain the same for all chassis.
This article will endeavour to assist the engineer in various faultfinding procedures that have been found to be
beneficial in reducing repair times and cost. One important item to note is that the large and expensive
(microprocessor, VDP, MSP, etc) IC’s only rarely fail.
It is worthwhile considering that there have been a number of different types of CRT used with this chassis for
the same model type. Philips, Thomson (Videocolor) and LG CRT have been used. Note that the scanning coils are
supplied with the CRT and therefore the horizontal output stage components will be different for different CRT
types. With the Philips CRT there are two focus anodes, so the fly-back transformer is also different in these
models.
Most of the problems on this chassis are related to either the power circuits (chopper and horizontal) or
memory. Resetting or replacing the memory can easily cure many faults that appear to lie in the picture
processing circuitry or drive areas.
Production started in 1999 with the FW models and continued up to the HW models. There have been a number
of changes to the circuit configuration, layout and operation but the overall circuit theory and fault finding
techniques remain the same for all chassis.
This article will endeavour to assist the engineer in various faultfinding procedures that have been found to be
beneficial in reducing repair times and cost. One important item to note is that the large and expensive
(microprocessor, VDP, MSP, etc) IC’s only rarely fail.
It is worthwhile considering that there have been a number of different types of CRT used with this chassis for
the same model type. Philips, Thomson (Videocolor) and LG CRT have been used. Note that the scanning coils are
supplied with the CRT and therefore the horizontal output stage components will be different for different CRT
types. With the Philips CRT there are two focus anodes, so the fly-back transformer is also different in these
models.
Most of the problems on this chassis are related to either the power circuits (chopper and horizontal) or
memory. Resetting or replacing the memory can easily cure many faults that appear to lie in the picture
processing circuitry or drive areas.
Figure 1: DA100 (50Hz) Chassis – model 56FW53H
Sharp Electronics (UK) Limited - May 2003
Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 8 of 80
Sharp Electronics (UK) Limited - May 2003
Revision 3
Product Specifications
The basic chassis comes with NICAM and fast text as standard and can drive CRT’s from 56 to 76cm in both 4:3
and 16:9 formats. The only 4:3 sets that use this chassis are the 59ESD7H and 66ESD7H, both of which are
Dolby Pro-Logic models.
All variants of this chassis are fitted with three SCART sockets on the rear of the board – composite video, S-
Video and RGB can be fed into these sockets. In addition to this, some models have front AV sockets (phono and
S-Video).
All Dolby Pro-Logic models have full functionality, allowing connection of separate speakers for front left, front
right, rear left, rear right and sub-woofer. In the Pro-logic mode (once correctly set up in the user menu) the
internal speakers – left, right and centre - become the centre channel.
and 16:9 formats. The only 4:3 sets that use this chassis are the 59ESD7H and 66ESD7H, both of which are
Dolby Pro-Logic models.
All variants of this chassis are fitted with three SCART sockets on the rear of the board – composite video, S-
Video and RGB can be fed into these sockets. In addition to this, some models have front AV sockets (phono and
S-Video).
All Dolby Pro-Logic models have full functionality, allowing connection of separate speakers for front left, front
right, rear left, rear right and sub-woofer. In the Pro-logic mode (once correctly set up in the user menu) the
internal speakers – left, right and centre - become the centre channel.
Model
Screen
Size
Fast Text
NICAM
Pro-Logic
Double
Copper
Copper
CRT Types
Production
28HW53H 66cm
3
3
3
Thomson
2001 to 2002
32HW53H 76cm
3
3
3
Thomson
2001 to 2002
56FW53H 56cm
3
3
3
Philips/Thomson
1999 to 2002
66FW53H 66cm
3
3
Thomson/LG
1999 to 2001
66FW54H 66cm
3
3
3
Thomson/LG
1999 t0 2001
66FW54H 66cm
3
3
3
Thomson/LG
2000 to 2002
66GF63H 66cm
3
3
3
Philips/Thomson
2000 to 2002
66GF64H 66cm
3
3
3
3
Philips
2000 to 2002
76FW53H 76cm
3
3
Thomson/LG
1999 to 2001
76FW54H 76cm
3
3
3
Thomson/LG
1999 to 2001
76FW54H 76cm
3
3
3
Thomson/LG
2000 to 2002
76GF63H 76cm
3
3
3
Philips
2000 to 2002
76GF64H 76cm
3
3
3
3
Philips
2000 to 2002
In some FW and GF models, and in all HW models, an earth plane was added to the top surface of the PWB
(double copper), this is green in colour. This reduces interference and the possible corruption of the NVM
caused by power supply variations and CRT discharges. It is possible to identify these chassis as the fourth digit
of the serial number starts with the number 5.
In later FW sets, a power factor module was fitted as a separate PWB. This was connected between the output
of the mains bridge rectifier and the main smoothing block. Its function is to ensure that the current/voltage
draw from the mains is kept in sync. This eliminates ‘spikes’ or ‘troughs’ in the mains voltage waveform which
keeps the electricity suppliers happy.
Note that the first three digits before the serial number are in fact the month and year of manufacture, i.e.
201
512112 is January 2002.
Click on the first or last page to see other 66FW-54H service manuals if exist.