Hp Laptop DV7-1245DX turn off after 3 secs.

[crdz66]

Hello Friends.

I have a hp laptop dv7-1245dx with turn off after 3 secs after push turn on button.
This laptop comes to me because has overheating past time.
The laptop was working slow and don't let me reinstall a fresh copy of Windows Vista or Windows 7. (stop a middle of the job)
So, I decide to do the reflow (20 times success before with another laptops) and now doesn't want keep on.

My question is.
Do I screw up the video chip?
Processor comes badly?

Any help can be appreciate.
Thanks.

[ktmmotocross]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

yes u fried the chip.

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

ups.
thanks

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

update.
The indicator light charging is on
When I push power button turn on even the fan and turn off after 3 secs.
After that when I press the power button again doesn't do nothing.
I have to disconnect the power adapter and try again for antoher 3 secs.
I have the schematic but where do I need look for gpu fail.
What do I need looking at?
thanks

[ktmmotocross]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

check for short on gpu power rails

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

Can you tell me with a picture where exactly is?
Sorry for little knowledge

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

I think I find the problem.
I guess.



On some of components on the top gpu chip there is not continuity. (3)
Maybe a shorted????

[ktmmotocross]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

this ic is sensible to heat and easy can blow. just check resistance of top capacitors on chip. cannot get both side lower than 04ohm

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

ok.
let me check

[crdz66]

Re: Hp Laptop DV7-1245DX turn off after 3 secs.

yeah.
the same 3 capacitor show higher resistance,
next step.
replace motherboard right?