Dell P780 - 17" CRT Display Service Manual page 21

D BOARD SCHEMATIC DIAGRAM
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FOLDOUT 3 1
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8/6/99, 10:43 AM
D BOARD WAVEFORMS
1 2
5.1 Vp-p (H) 3.5 Vp-p (H)
4 5
6.0 Vp-p (H) 1.175 kVp-p (H)
7 8
1.8 Vp-p (H) 55.3 Vp-p (H)
10 11
10.5 Vp-p (H) 9.3 Vp-p (H)
13 14
1.5 Vp-p (H) 1.181 kVp-p (H)
D BOARD IC VOLTAGE LIST
IC401 IC502 IC603 7
pin volt pin volt pin volt 8
1 1.6 1 1.4 1 9.2 9
2 14.8 2 1.4 2 8.1 10
3 -14.6 3 -15.0 3 N C 11
4 -15.1 4 0.1 4 3.5 12
5 0.2 5 14.8 5 3.5 13
IC503
6 14.8 6 12.3 14
7 1.6 pin volt IC604 15
IC501
1 89.5 pin volt 16
pin volt 2 88.6 1 2.5 17
1 11.9 3 79.3 2 GND 18
2 4.0 4 88.7 3 7.0 IC702
3 4.0 5 98.4 IC605 pin
4 5.5 IC601 pin volt 1
5 8.9 pin volt I N 14.8 2
6 4.5 1 153.5 OUT 11.9 3
7 GND 2 N C GND GND 4
8 0.2 3 GND 4 4.8 5
9 GND 4 2.5 IC607 6
10 8.2 5 0.0 pin volt 7
11 4.4 6 12.5 I N 9.5 8
12 5.8 7 12.3 OUT 5.0 9
13 5.8 8 2.5 GND GND 10
14 5.8 9 2.8 IC608 11
15 5.2 10 N C pin volt 12
16 11.3 11 GND I N 11.9 IC703
17 11.9 12 N C OUT 5.0 pin
18 6.8 13 0.9 GND GND 1
19 8.0 14 6.1 IC701 2
20 6.1 IC602 pin volt 3
21 GND pin volt 1 4.9 4
22 4.3 1 3.1 2 5.0 5
23 4.0 2 9.1 3 4.9 6
24 4.0 3 GND 4 4.9 7
4 6.3 5 5.0 8
5 1.2 6 5.0 9
10
D BOARD TRANSISTOR
VOLTAGE LIST
B C E
Q501 5.5 11.5 5.5
Q502 5.5 GND 5.5
Q504 1. 1 135.0 0.6
Q505 0.6 -15.1 1. 1
Q506 2.2 GND 2.8
Q507 -0.6 49.1 GND
Q508 0.5 11.9 0.9
Q518 2.3 88.5 2.8
Q519 0.4 11.8 GND
Q521 4.8 GND 5.4
Q522 4.7 GND 5.0
Q524 5.0 GND 5.5
Q525 0.5 11.9 0.9
Q601 0 11.9 GND
Q603 5.0 0 GND
Q604 0 8.1 GND
Q605 4.8 0 GND
Q903 0.4 5.5 GND
All voltages are in V
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P780
3
5.5 Vp-p (H)
6
47.5 Vp-p (H)
9
12.0 Vp-p (H)
12
12.0 Vp-p (H)
15
1.7 Vp-p (H)
5.0 IC901 36 4.6 14 0.9
5.0 pin volt 37 4.0 15 GND
4.9 1 N C 38 5.0 16 11.5
11.9 2 5.0 39 5.0 17 0.4
4.5 3 2.5 40 N C 18 5.6
4.9 4 2.2 41 N C 19 10.4
5.0 5 N C 42 N C 20 9.2
3.3 6 4.8 43 N C 21 2.4
1.1 7 0 44 2.3 22 9.7
4.0 8 N C 45 2.3 23 5.0
4.6 9 N C 46 1.2 24 4.9
GND 10 GND 47 0.6 25 3.5
11 5.1 48 3.7 26 0.5
volt 12 N C 49 0.4 27 4.9
-0.2 13 N C 50 0.4 28 0
2.5 14 4.7 51 4.9 29 0.4
2.5 15 4.9 52 4.9 30 GND
2.5 16 3.9 53 5.0 IC904
2.5 17 2.3 54 4.9 pin volt
-0.1 18 3.7 55 N C 1 GND
-15.0 19 0 56 GND 2 GND
GND 20 0.1 IC902 3 GND
14.8 21 5.0 pin volt 4 4.9
N C 22 0.2 1 2.2 5 5.0
3.2 23 4.7 2 4.7 IC905
GND 24 5.0 3 4.0 pin volt
25 0 4 4.6 1 GND
volt 26 0 5 GND 2 GND
-0.2 27 0.5 6 4.0 3 GND
-0.2 28 2.8 7 5.6 4 GND
3.8 29 GND 8 4.9 5 4.0
3.8 30 0.5 9 4.0 6 4.6
-15.0 31 5.0 10 5.0 7 5.0
3.8 32 0.9 11 6.2 8 5.0
3.8 33 0.4 12 4.7
All voltages are in V
-0.2 34 4.7 13 N C
-0.2 35 4.7
14.8
D BOARD TRANSISTOR
VOLTAGE LIST
D G S
Q503 93.0 176.0 179.0
Q510 84.5 7.9 GND
Q511 -11.1 -1.8 -14.8
Q512 0 4.9 GND
Q513 33.2 0.4 GND
Q514 33.8 0.4 GND
Q515 0 4.9 GND
Q516 0 5.0 GND
Q520 88.9 176.0 179.0
Q602 131.8 2.4 0.1
All voltages are in V
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