76DW-18H (serv.man32). Faults on the 100Hz PWB - Sharp TV Technical Bulletin (repair manual)

Model
76DW-18H (serv.man32)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
23.24 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
TV / CTR / Faults on the 100Hz PWB
File
76dw-18h-sm32.pdf
Date

View Sharp 76DW-18H (serv.man32) Technical Bulletin online

 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 
 
Sharp Electronics (UK) Limited 
Reference JR031299-1
   
Revision  2 
 
White – Carry out as required, Yellow – Carry out as required and whenever the unit comes in for service, Red – Carry out on all units   
CTV991202 
Month of Issue: December 1999 
        Classification:                   White      
TELEVISION TECHNICAL BULLETIN 
     Page 1 of 1 
 
 
MODELS
  
66DW18H 
76DW18H 
76EF19H 
76EF20H 
 
 
 
 
 
 
SYMPTOM 
The following problems can occur on the 100Hz PWB. 
 
• 
Intermittent digital noise on the picture  
• 
Intermittent mosaic squares on the picture  
• 
Mosaic effect if the 100Hz PWB is tapped  
• 
Red, green or blue screen if the 100Hz PWB is tapped        
 
 
 
CAUSE Problems around the field mixer IC, SDA9270. 
 
• 
IC6108 in the 66DW18H and 76DW18H 
• 
IC6105 in the 76EF19H and 76EF20H       
 
 
ACTION Carry out the following counter measures.  
 
1. Make sure that there are no dry joints on the Mother PWB  
2. Resolder IC6108/IC6105 by reflowing the device - it is not necessary to remove 
IC6108/IC6105   
 
Note that you can operate the 100Hz PWB with the shield cans removed.   
 
It is important that these are returned to there original condition when the job is 
completed.            
 
 

Download Sharp 76DW-18H (serv.man32) Technical Bulletin

Here you can view online and download Sharp 76DW-18H (serv.man32) Technical Bulletin in PDF. 76DW-18H (serv.man32) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair Sharp 76DW-18H (serv.man32) CTR. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.