Hp cq56-129 nr no power problem help urgent

[razu]

this motherboard have no 3v and 5v. I change RT8206B but no result .. write the bios same condition.

I write here power IC voltage . Please any one can help
IC RT 8206B
pin 1 - 2.00 V,
2-0,
3- 4.96,
4- 15.59,
5 - 0,
6- 20.8,
7 - 4.9,
8- 0,
9-0,
10-0,
11-0,
12-1.1,
13-0,
14-4.8,
15-0,
16-0,
17-4.9,
18-4.9,
19.4.9,
20-4.9,
21-0,
22-0,
23-0,
24-4.5,
25-0,
26-0,
27-4.8,
28-0,
29-0,
30-0,
31-1.1,
32-0 volt

[subroto]

Re: Hp cq56-129 nr no power problem help urgent

Check S5_enable signal from SIO. Then tell me the result.

[meritosari]

Re: Hp cq56-129 nr no power problem help urgent

Seem OVP. Try replace caps with tantalum

[razu]

Re: Hp cq56-129 nr no power problem help urgent

without SIO supply 3.3 input voltage , how can i find S5 Enable voltage .............

[kiraro]

Re: Hp cq56-129 nr no power problem help urgent

this motherboard have no 3v and 5v. I change RT8206B but no result .. write the bios same condition.

I write here power IC voltage . Please any one can help
IC RT 8206B
pin 1 - 2.00 V,
2-0,
3- 4.96,
4- 15.59,
5 - 0,
6- 20.8,
7 - 4.9,
8- 0,
9-0,
10-0,
11-0,
12-1.1,
13-0,
14-4.8,
15-0,
16-0,
17-4.9,
18-4.9,
19.4.9,
20-4.9,
21-0,
22-0,
23-0,
24-4.5,
25-0,
26-0,
27-4.8,
28-0,
29-0,
30-0,
31-1.1,
32-0 volt

Hello,check PQ44,PQ45,PQ46,PQ49 ,if there are ok ,check the feedback line (for 3V =PR94,PR97,for 5v= PR79,PR77) if all ok check if there is a short in one of the 3v line and 5v line.
hope that help you .

[subroto]

Re: Hp cq56-129 nr no power problem help urgent

Pin no. 32 must have some value. check the PR96. I think it is the culprit.

[subroto]

Re: Hp cq56-129 nr no power problem help urgent

one side of PR96 is connected with pin no.32 and another side with +5V_VCC1. Check this part carefully.

[razu]

Re: Hp cq56-129 nr no power problem help urgent

After all I found 3v and 5v but another problem 3.3v drop to 1.22 volt but 3.3v coil was no short ......... and switching volt is 3.3v....

power ic is hot

what can i do now