Sony pcg-71318l

[rickybucalan]

hi guys...... i got here sony laptop board it has a power but no display.

the intel chips gets very hot

i found shorted on coil PL18 and tantalum caps and removed.

but it still shorted pads. pls help......i attached some picture.

tnx..

[jasko_jacker]

Re: Sony pcg-71318l

First , check (if the laptop goes on) the 5v and 3v dc/dc chip. after, is possible that the bga is in short itself , see on schematic if ther is a possibilty to exclude the power of this chip and check the short again.
If you post the motherboard model example mbx-XXXX I try to find the schematic.

[Ramee]

Re: Sony pcg-71318l

Check pq14 and the other FET next to it. may be they are shorted, not the cap & coil.

[rickybucalan]

Re: Sony pcg-71318l

First , check (if the laptop goes on) the 5v and 3v dc/dc chip. after, is possible that the bga is in short itself , see on schematic if ther is a possibilty to exclude the power of this chip and check the short again.
If you post the motherboard model example mbx-XXXX I try to find the schematic.

thanks for the response i appreciate your help...

its a MBX-223 M971 mainboard.

sorry to my 1st post the board has no power.

when checking 5v and 3.3v it present after 20 sec its done. and bga chip goes cool down.

[rickybucalan]

Re: Sony pcg-71318l

Check pq14 and the other FET next to it. may be they are shorted, not the cap & coil.

thanks.
the fets were fine. no short...

[andalusi]

Re: Sony pcg-71318l

Here the diagram

[rickybucalan]

Re: Sony pcg-71318l

any idea guys...here...