Service Manual
Model
Model
Model
Model No.:
No.:
No.:
No.: 75UF5550
75UF5550
75UF5550
75UF5550
No sound No picture
No
Verify if the Power has
5Vstb output
Yes
Change the
Power supply
Verify if CND2 Pin3/4 has 5V
input
Yes
Verify if CND1 Pin1 has 12V
input
Yes
Verify if DC/DC convertors have
the right output
Yes
No
No
No
Change Power board
Change Power board
Change corresponding
DC/DC convertor
Still having
Change
Change the software
41
41
41
41
Problems
Mainboard
