 Troubleshooting ATX Power Supply
Have eMachines T2862. System will not power up. LED on Motherboard lights up. Fans do not run. HDD does not powerup.
Checked ATX power supply. ATX-250-12E Rev:P7.
Red and Yellow are under voltage stds.
Orange shows 0 volts
Actual Voltage as follows:
On P2, P3, P5, P7 Red = 2.8v & Yellow = 7.8v (vs 5v and 12v)
On P8 Y = 7.8v vs. 12v
On 20 pin Motherboard connector:
Pin Actual Should Be
1. Orange +0.0 +3.3
2. Orange +0.0 +3.3
3. Black
4. Red +2.8 +5.0
5. Black
6. Red +2.8 +5.0
7. Black
8. Gray +0.0 ??
9. Purple +5.0 +5.0 Standby
10. Yellow +7.7 +12.0
11. Or./Brown +0.0 +3.3
12. Blue +2.6 ??
13. Black
14. Green +2.3 ??
15. Black
16. Black
17. Black
18. White +0.0 +5.0
19. Red +2.8 +5.0
20. Red +2.8 +5.0
Questions:
1. What do these numbers indicate as to the type of problem that exists with the power supply?
2. Can the power supply be repaired (by me) or should I just replace it?
3. Any other observations or troubleshooting ideas?
Thanks. |