CX5200 Field Service Manual
50
Black Screen Troubleshooting (cont.)
Repair
Is there +5V to all chips?
(See chart)
Is Pin 40 of U2 at 5V ?
Is Pin 36 of U3 at 5V ?
Swapout
1)
U2
2)
U3
3)
U5
4)
U8
5)
U7
Repair open between chip /
+5V or Ground.
(Check for bad socket)
Defective U1 or other Reset
circuitry connected to U2
Pin40
Open Pin 36 of U2 to
Pin 40 of U5
Is problem repaired?
F
B4
B3
No
Yes
No
No
Yes
Yes
Yes
PCB #
Pin #
C
A
0
2
0
1
0
8
C
A
0
1
8
0
8
7
+5V
GND
A1
U1
1
8
A2
U2
8
1,21
A3
U3
21
1
U4
20
10
A5
U5
27
3
A6
U6
16
8
A7
U7
17
1
A8
U8
24
12
A9
U9
16
8
A10
U10
16
8
A11
U11
16
8
A12
U12
16
8
A13
U13
16
8
A14
U14
14
7
U15
20
10
A16
U16
16
8
A17
U17
16
8
A18
U18
8
16
A19
U19
8
16
A20
U20
8
16
A21
U21
8
16
A22
U22
8
16
A23
U23
8
16
A24
U24
8
16
A25
U25
8
16
U26
Not used
A27
U27
14
7
U28
14
7
U29
14
7
A15
14
7
A26
14
7
Summary of Contents for CX 5200
Page 1: ......
Page 17: ...CX5200 Field Service Manual 17 Figure 2 1 4 Port 5200 CA018087 Motherboard Silkscreen ...
Page 18: ...CX5200 Field Service Manual 18 Figure 2 2 4 Port 5200 CA018087 Motherboard Schematic Part 1 ...
Page 19: ...CX5200 Field Service Manual 19 Figure 2 3 4 Port 5200 CA018087 Motherboard Schematic Part 3 ...
Page 20: ...CX5200 Field Service Manual 20 Figure 2 4 4 Port 5200 CA018087 Motherboard Schematic Part 3 ...
Page 21: ...CX5200 Field Service Manual 21 Figure 2 5 4 Port 5200 CA020108 Motherboard Silkscreen ...
Page 22: ...CX5200 Field Service Manual 22 Figure 2 6 4 Port 5200 CA020108 Motherboard Schematic Part1 ...
Page 23: ...CX5200 Field Service Manual 23 Figure 2 7 4 Port 5200 CA020108 Motherboard Schematic Part2 ...
Page 24: ...CX5200 Field Service Manual 24 Figure 2 8 4 Port 5200 CA020108 Motherboard Schematic Part 3 ...
Page 25: ...CX5200 Field Service Manual 25 Figure 2 9 2 Port 5200 CA021374 Motherboard Silkscreen ...
Page 26: ...CX5200 Field Service Manual 26 Figure 2 10 2 Port 5200 CA021374 Motherboard Schematic Part 1 ...
Page 27: ...CX5200 Field Service Manual 27 Figure 2 11 2 Port 5200 CA021374 Motherboard Schematic Part 2 ...
Page 28: ...CX5200 Field Service Manual 28 Figure 2 12 2 Port 5200 CA021374 Motherboard Schematic Part 3 ...
Page 29: ...CX5200 Field Service Manual 29 Figure 2 13 Trakball Silkscreen ...
Page 30: ...CX5200 Field Service Manual 30 Figure 2 14 Trakball Schematic Part1 ...
Page 31: ...CX5200 Field Service Manual 31 Figure 2 15 Trakball Schematic Part 2 ...
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