FIC a440 服务手册
Troubleshooting and Repair
FIC A440 Series Service Manual
6-27
6.4.24 DC-DC Power Check
24
Press Power
Switch
Q54 PIN 5,6,7,8
= 10V~20V
Check U4
PIN 27,28 = +3V
U7 PIN12= +5V
Check Q51, Q52, L18,
D41, D42, U7
L89 PIN1,2
= +3V
Check Q53, Q54, D36,
D34, L11, U7
END
NO
NO
NO
YES
YES
D3 PIN1=12V
Check U4
NO
Check main board, F1,F3
Check I/O board F601
NO
YES
YES
YES
Figure 6-23
DC-DC Power Check
6.4.25 TV Out Check
25
Check TV chip power
Check TV chip
Data Bus
Check U40 Pin 1~4, 6,
42~44 TVD(0~7)
Check TV chip
SM Bus
Check U40 Pin 26, 27
Check TV chip clock
Check U40 Pin 39
END
NO
NO
NO
YES
YES
Check TV chip
output
Check CN19 Pin 3, 4
NO
Check U40 Pin 5, 16, 25,
31, 35 = +3V
U40 Pin 38 = +5V
NO
YES
YES
YES
Figure 6-24
TV Out Check