Sony PCG-81312M no power.

[rippergr]

Hello all,
I have a sony vaio pcg-81312M
product name: vpcf22m1e
Motherboard type : v081_MP_MB
Rev 1.1
MBX-243
My problem is that the laptop doesnt power on at all. I couldn't find schematics except from a thread in forum

https://www.badcaps.net/forum/showthread.php?p=482456

which is for MBX-215.
I measure dc from power adaptor which is ok and in PF1 but after PF1 I don't know how to continue because the schamtics are no exactly the same.
I suppose it continues from the other side (I will attach closeup picture ) which all mosfet PQ1 and PQ2 have no voltage (I measure them with diode and they are ok) and all the components near them dont have voltage at all.
Can someone provide me some schematics or has any idea what to check.

[rippergr]

Re: Sony PCG-81312M no power.

Somehow the power restored to mosfets and in PU3 (or PU1 it doesn't show very well) BQ24753A and I have the voltages in the attached image.
The laptop still doesnt power on.

[Life Goes On]

Re: Sony PCG-81312M no power.

It is difficult to work without schematic, but have you measure the current on the BIOS chip, otherwise you can reflash the BIOS chip and see what that does.

[ktmmotocross]

Re: Sony PCG-81312M no power.

start from hete
https://cdn.badcaps-static.com/pdfs/...791996af74.pdf

[rippergr]

Re: Sony PCG-81312M no power.

It is difficult to work without schematic, but have you measure the current on the BIOS chip, otherwise you can reflash the BIOS chip and see what that does.

If the problem was in bios I think that the laptop would start but it wont POST.

start from hete
https://cdn.badcaps-static.com/pdfs/...791996af74.pdf

I already measure this chip and I have the results in my last post.

The voltage to the power controller I think it's ok . What can I check after that ? northbridge chip ? and what voltages

[rippergr]

Re: Sony PCG-81312M no power.

Can somebody help me with this?

[gokhankelebek]

Re: Sony PCG-81312M no power.

mbx-215 m931 bios pls!!!!

[jhonecaj]

Re: Sony PCG-81312M no power.

please Schematic for sony pcg-81312L mbx-243 v081_mp_mb

[jhonecaj]

Re: Sony PCG-81312M no power.

mbx-215 m931 bios pls!!!!

https://www.badcaps.net/forum/showthread.php?t=65381