76DW-18H (serv.man2). Fault finding guide - Sharp TV Service Manual (repair manual). Page 8

Sharp Electronics (UK) Limited

Originator AvW   Supervisor                        Approval Date    /   /     Reference GE84601X

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

Month of Issue: January 1999

        Classification:                White

Page 1 of 1

SYMPTOM While in the RGB mode, sync may be lost when the channel up or down buttons are

pressed.

Corruption of the EPROM data.

Change the EPROM, using the part number given below.

IC1004

EPROM, 66DW18H

CH-IX1642CJH0

AZ

IC1004

EPROM, 76DW18H

CH-IX1642CJH1

AX

 

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   

Month of Issue: December 1999 

        Classification:                   White   

 

 

 

 

 

Page 1 of 1 

 

 

MODELS
 

 

 

 
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       

 

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.