Hi everyone this is the first time i troubleshoot this motherboard I need help and advise on this I have receive this Sony vaio vgn-ns140e Model no;PCG-7141L and motherboard number; MBX 202 M790 IP-0087J01 REV.1.1 which is NO POWER no led light and battery charge light but there is 19.9 volts on dc. here is the measurement below;
PQ24 PIN 1.19.9V
2. 19.9V
3. 19.9V
4. 4.17V
5. 19.9V
6. 19.9V
7. 19.9V
8. 19.9V
PQ25 PIN 1.19.9V
2. 19.9V
3. 19.9V
4. 19.9V
5. 2.55V
6. 2.55V
7. 2.55V
8. 2.55V
PU1 BQ2475 PIN 1. 3.3V
2. 2.5V
3. 2.5V
4. 2.5V
5.4..17V
6. 1.69V
7. 0.05V
8. 2.82V
9. 0.05V
10. 3.34V
11. 3.34V
12. 1.14V
13. 2.5V
14. 2.5V
15.0.08V
16. 0V
17. 0.14V
18.0.05V
19. 0.05V
20. 0.05V
21.0.05V
22.0.05V
23.0.05V
24.0.05V
25.0.05V
26.0.05V
27.0.05V
28. 19.79V
PU12 the bios chip has voltage on pin3 1.6v, pin 7 2.4v pin 8 2.4v and there is no 3v on power switch
anyone please help me advise what is the culprit on this board please thanks in advance
PQ24 PIN 1.19.9V
2. 19.9V
3. 19.9V
4. 4.17V
5. 19.9V
6. 19.9V
7. 19.9V
8. 19.9V
PQ25 PIN 1.19.9V
2. 19.9V
3. 19.9V
4. 19.9V
5. 2.55V
6. 2.55V
7. 2.55V
8. 2.55V
PU1 BQ2475 PIN 1. 3.3V
2. 2.5V
3. 2.5V
4. 2.5V
5.4..17V
6. 1.69V
7. 0.05V
8. 2.82V
9. 0.05V
10. 3.34V
11. 3.34V
12. 1.14V
13. 2.5V
14. 2.5V
15.0.08V
16. 0V
17. 0.14V
18.0.05V
19. 0.05V
20. 0.05V
21.0.05V
22.0.05V
23.0.05V
24.0.05V
25.0.05V
26.0.05V
27.0.05V
28. 19.79V
PU12 the bios chip has voltage on pin3 1.6v, pin 7 2.4v pin 8 2.4v and there is no 3v on power switch
anyone please help me advise what is the culprit on this board please thanks in advance
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