sony vgn-nr498e no power

[testas86]

so my friend just gave me this sony to look at and when i plugged it in it wouldnt power on at all. so i took it apart and i tested the voltage at the dc jack and it was getting 20v and i was looking over the motherboard and saw this 1r0 had a crack in it. i was wondering where i can find this part, what is this part, and chances it will be the case of the no power issue.

[momaka]

Re: sony vgn-nr498e no power

Looks like one of the "4R7"s has a crack in it as well (the part with the PL12 label).
These parts are inductors, and if I remember correctly, the numbers/letters on top indicate the inductance in micro-Henry... so 4R7 should be 4.7 uH and 1R0 should be 1.0 uH.
Not sure if that could be causing your problems or not, but it's probably not a bad idea to replace them anyways.

[testas86]

Re: sony vgn-nr498e no power

do you know where i can buy these at?

[momaka]

Re: sony vgn-nr498e no power

Depends on which part of the world you live. If you're in the USA, Digikey.com and Mouser.com are the preferred online stores for parts like this. In Europe, I think it's either RS Components or Farnell.

In any case, finding 1.0uH and 4.7uH inductors won't be hard. The hard part is figuring out how much current are the current inductors on your board rated for and what material their core is made of as these parameters may actually be important in this application.

My guess (and this really is only a guess) would be that a 7 to 10A Ferrite Core inductor of a similar size and identical inductance should work. Something like this perhaps:
http://search.digikey.com/us/en/prod...57TR-ND/775096
But to be honest, I've never had to replace an inductor, so I may be wrong on this. I hope someone with more knowledge than me will chime in this thread soon.
In any case, if you have nothing else to try, this may work.

Another thing you may try is just to look for a similar inductor with the same numbers on top (1R0 or 4R7) on other bad circuit boards.

[b700029]

Re: sony vgn-nr498e no power

Those look fine, the core itself is the inductive part and seems to be intact.

As long as the core isn't cracked and there is continuity across the terminals it should work. Just a little bit of cosmetic damage.