UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
UPGRADING REPAIRING PCs
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86mm<br />
6mm<br />
64mm<br />
86mm<br />
16mm<br />
5 138mm<br />
7<br />
+<br />
+<br />
140mm<br />
5 115mm<br />
150mm<br />
+<br />
+<br />
30mm<br />
6<br />
+5V<br />
G<br />
G<br />
+12V<br />
+5V<br />
G<br />
G<br />
+12V<br />
+5V<br />
G<br />
G<br />
+12V<br />
+5V<br />
G<br />
G<br />
+12V<br />
Power Supplies 37<br />
3.3V*<br />
11 1<br />
3.3V*<br />
12 2<br />
-12V<br />
3.3V*<br />
13 3<br />
COM<br />
COM<br />
14 4<br />
PS-ON<br />
5V<br />
15 5<br />
COM<br />
COM<br />
16 6<br />
COM<br />
5V<br />
17 7<br />
COM<br />
COM<br />
18 8<br />
-5V<br />
PW-OK<br />
5V<br />
19 9<br />
5VSB<br />
20 10<br />
5V<br />
12V<br />
*optional<br />
ATX Power connector pin out<br />
Figure 2.6 ATX form factor power supply used with both ATX and NLX<br />
systems. The pinout for the motherboard power is shown at lower right.<br />
Note the single square pin used for keying.<br />
Table 2.14 shows the pinout for the ATX motherboard power connector.<br />
Table 2.14 ATX Motherboard Power Supply Connections<br />
Color Signal Pin Pin Signal Color<br />
Orange +3.3v 11 1 +3.3v Orange<br />
Blue -12v 12 2 +3.3v Orange<br />
Black GND 13 3 GND Black<br />
Green PS_On 14 4 +5v Red<br />
Black GND 15 5 GND Black<br />
Black GND 16 6 +5v Red<br />
Black GND 17 7 GND Black<br />
White -5v 18 8 Power_Good Grey<br />
Red +5v 19 9 +5VSB<br />
(Standby)<br />
Purple<br />
Red +5v 20 10 +12v Yellow<br />
Quick-Reference Chart for Troubleshooting Power<br />
Supplies<br />
Table 2.15 Troubleshooting Power Supplies<br />
Symptom Cause(s) Tests and Solution(s)<br />
Overheating. Inadequate system cooling Check ventilation around system;<br />
clean system internally; check for<br />
missing slot covers.<br />
Higher load on system in Replace power supply with higher<br />
watts than power supply rated unit.<br />
rating
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