vcc-core shorted

[hienton2]

Hello all .
I am working with HP pavillion dv6000.This one can power on with battery charged. But can not boot with adapter. I find out vc-core is shorted. Check caps are ok. I want to know
where is the vcore connect to . may be the load is shorted. I do not know the load for vc-core.Help. TIA

ps This one has max8774 ic to produce vc-core. looklike this ic is ok.

[stj]

Re: vcc-core shorted

check the fet's
and diodes.

[hienton2]

Re: vcc-core shorted

Thanks for response STJ . I remove the 2 L filters And the short is on the other end (The load side with big caps) . Not the fets side.

[stj]

Re: vcc-core shorted

cpu in a socket, or soldered down?

could be the cpu, more likely a bad capacitor - ceramic most likely.

[hienton2]

Re: vcc-core shorted

Yesterday is a little bit different. Today I took out cpu . I find no more short at big caps filters for vcore.
Something interesting in working with laptop motherboard.Will post more If I find something new.

[rzcosme]

Re: vcc-core shorted

Hi hienton2 !

Did you resolve this problem? I'm with the same situation. When I put the processor on the socket, some caps turn shorted. Is it really cap problem? I change the cpu, same problem.

Thanks in advance.

[mattbrad2]

Re: vcc-core shorted

Can't test for shorts with the CPU installed since this will cause false readings on caps / diodes / fets. Half the board will appear shorted unless the CPU is removed before testing. That being said, my money is still on a shorted mosfet, quite possibly the 4407 closest to the DC jack. Do you know how to test these with a meter? Plug the charger in and trace the 19v line as far out as you can. Really the only other thing it could be is the maxim IC you were referring to. How did you test this to know its ok?

[TheLaptopDoctor]

Re: vcc-core shorted

The DV6000 series is a generic number. Please provide accurate information on the model. There may be an answer. It is on the bottom on the white sticker. DV6500 series is a lot different than DV61xx, DV62xx etc Some times the problem is not even in the power section or DC in.

[mjtech]

Re: vcc-core shorted

Hi all,
this thread is related to vcore, so i am posting my problem here.
I am working on a industrial motherboard shb110 .
It has c2d processor(on board), 945 chipset,ich7.

Isl 6537a for gmch and ddr section 1.5v and 1.8v
and isl 6262 for cpu core section.
Sio w83627hg-aw

problem in this motherboard is , its not booting, cpu voltage is coming 0.7v , which should be 0.9v to 1v as per reading from working board

gmch, ddr, vtt_gmch all voltages coming properly.

Isl 6262 ic giving pgood and clken# signal properly which means ic is ok.

Pcirst signal is also coming.

Now i am stuck at this 0.7 v problem ....
Is it a problem of cpurst signal or cpu it self. Or else ...

Please anyone can guide me in this problem please....

Thanks in advance

[piernov]

Re: vcc-core shorted

Check CPU VCore capactors, check voltage of VID0 to VID6 pins of ISL6262. Make sure you use a good and compatible CPU.

PS: for every new problem you should open a new thread.