Dell P780 - 17" CRT Display Service Manual page 46

D BOARD SCHEMATIC DIAGRAM (3 of 3)
35 36 37 38
| | |
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
39 40 41 42
| | | |
D BOARD WAVEFORMS
1
5.1 Vp-p (H)
4
6.0 Vp-p (H)
7
1.8 Vp-p (H)
10
10.5 Vp-p (H)
13
1.5 Vp-p (H)
D BOARD IC VOLTAGE LIST
IC401 IC502
pin volt pin volt
1 1.6 1 1.4
2 14.8 2 1.4
3 -14.6 3 -15.0
4 -15.1 4 0.1
5 0.2 5 14.8
6 14.8
IC503
7 1.6 pin volt
IC501 1 89.5
pin volt 2 88.6
1 11.9 3 79.3
2 4.0 4 88.7
3 4.0 5 98.4
4 5.5 IC601
5 8.9 pin volt
6 4.5 1 153.5
7 GND 2 NC
8 0.2 3 GND
9 GND 4 2.5
10 8.2 5 0.0
11 4.4 6 12.5
12 5.8 7 12.3
13 5.8 8 2.5
14 5.8 9 2.8
15 5.2 10 NC
16 11.3 11 GND
17 11.9 12 NC
18 6.8 13 0.9
19 8.0 14 6.1
20 6.1
IC602
21 GND pin volt
22 4.3 1 3.1
23 4.0 2 9.1
24 4.0 3 GND
4 6.3
5 1.2
D BOARD TRANSISTOR VOLTAGE LISTS
B C
Q501 5.5 11.5
Q502 5.5 GND
Q504 1.1 135.0
Q505 0.6 -15.1
Q506 2.2 GND
Q507 -0.6 49.1
Q508 0.5 11.9
Q518 2.3 88.5
Q519 0.4 11.8
Q521 4.8 GND
Q522 4.7 GND
Q524 5.0 GND
Q525 0.5 11.9
Q601 0 11.9
Q603 5.0 0
Q604 0 8.1
Q605 4.8 0
Q903 0.4 5.5
All voltages are in V
43 44 45 46
| | | |
2 3
3.5 Vp-p (H)
5
6
1.175 kVp-p (H)
8 9
55.3 Vp-p (H)
11 12
9.3 Vp-p (H)
14 15
1.181 kVp-p (H)
7 5.0
IC603
pin volt 8 5.0
1 9.2 9 4.9
2 8.1 10 11.9
3 NC 11 4.5
4 3.5 12 4.9
5 3.5 13 5.0
6 12.3 14 3.3
15 1.1
IC604
pin volt 16 4.0
1 2.5 17 4.6
2 GND 18 GND
3 7.0
IC702
IC605 pin volt
pin volt 1 -0.2
IN 14.8 2 2.5
OUT 11.9 3 2.5
GND GND 4 2.5
4 4.8 5 2.5
6 -0.1
IC607
pin volt 7 -15.0
IN 9.5 8 GND
OUT 5.0 9 14.8
GND GND 10 NC
IC608 11 3.2
pin volt 12 GND
IN 11.9
IC703
OUT 5.0 pin volt
GND GND 1 -0.2
IC701 2 -0.2
pin volt 3 3.8
1 4.9 4 3.8
2 5.0 5 -15.0
3 4.9 6 3.8
4 4.9 7 3.8
5 5.0 8 -0.2
6 5.0 9 -0.2
10 14.8
E D
5.5 Q503 93.0 176.0 179.0
5.5 Q510 84.5
0.6 Q511 -11.1 -1.8
1.1 Q512 0
2.8 Q513 33.2
GND Q514 33.8
0.9 Q515 0
2.8 Q516 0
GND Q520 88.9 176.0 179.0
5.4 Q602 131.8
5.0
5.5
0.9
GND
GND
GND
GND
— 10 —
GND
47 48 49 50
| | | |
5.5 Vp-p (H)
47.5 Vp-p (H)
12.0 Vp-p (H)
12.0 Vp-p (H)
1.7 Vp-p (H)
36 4.6
IC901
pin volt 37 4.0
1 NC 38 5.0
2 5.0 39 5.0
3 2.5 40 NC
4 2.2 41 NC
5 NC 42 NC
6 4.8 43 NC
7 0 44 2.3
8 NC 45 2.3
9 NC 46 1.2
10 GND 47 0.6
11 5.1 48 3.7
12 NC 49 0.4
13 NC 50 0.4
14 4.7 51 4.9
15 4.9 52 4.9
16 3.9 53 5.0
17 2.3 54 4.9 pin
18 3.7 55 NC
19 0 56 GND
20 0.1 IC902
21 5.0 pin volt
22 0.2 1 2.2
23 4.7 2 4.7
24 5.0 3 4.0 pin
25 0 4 4.6
26 0 5 GND
27 0.5 6 4.0
28 2.8 7 5.6
29 GND 8 4.9
30 0.5 9 4.0
31 5.0 10 5.0
32 0.9 11 6.2
33 0.4 12 4.7
34 4.7 13 NC
35 4.7
G S
7.9 GND
-14.8
4.9 GND
0.4 GND
0.4 GND
4.9 GND
5.0 GND
2.4 0.1
All voltages are in V
P780
51 52
| | |
A
B
C
D
E
F
G
H
I
J
K
14 0.9
15 GND
L
16 11.5
17 0.4
18 5.6
M
19 10.4
20 9.2
21 2.4
22 9.7
N
23 5.0
24 4.9
25 3.5
O
26 0.5
27 4.9
28 0
P
29 0.4
30 GND
IC904
Q
volt
1 GND
2 GND
R
3 GND
4 4.9
5 5.0
S
IC905
volt
1 GND
T
2 GND
3 GND
4 GND
U
5 4.0
6 4.6
7 5.0
V
8 5.0
All voltages are in V
W
X
Y
Z