Toshiba C660D Blown Fuse

[luke10050]

hey guys, ive been reading this forum for a little while and i figured i might register. So anyway, the fuse on the laptop's motherboard (labelled PF1) is blown and i have no idea where to get a suitable replacement, also the laptop refuses to boot on battery power, just turns on then off. was really just a test laptop for me to mess around with it and see if i could fix it. im quite keen on getting into component level PCB repair and the like. Any help would be greatly appreciated!

P.S: The exact model is C660D PSC1YA-00G00L

[selldoor]

Re: Toshiba C660D Blown Fuse

Can you post a good clear picture of the fuse and the area of the board

[luke10050]

Re: Toshiba C660D Blown Fuse

ive tested the area around the fuse with a multimeter and tried bridging the fuse... when that it done the PC works fine... heres the pic (the light is from my $1.50 halogen globe from the 2 dollar store and a post-it note light filter)

[selldoor]

Re: Toshiba C660D Blown Fuse

Hi - ok not a simple answer the fuse is a Bourns 2.5A But I believe the schematic for
a C660 (not sure about the D has a 7A24v Fuse so has it been replaced previously.
So it may have blown because it is too small amps. I will attache some supporting info and you can decide. Perhaps try a 4Amp one??

This is the 7A 24v equivalent of what you have
http://uk.rs-online.com/web/p/non-re...fuses/6925043/

This is the datasheet for the fuse mentioned in the schematic as on pic
429007 wrml
https://cdn.badcaps-static.com/pdfs/...80ed0c5c0c.pdf

This is the datasheet for the fuse you have in and you can see T is 2.5A but you can get a 7A

[luke10050]

Re: Toshiba C660D Blown Fuse

would it be advisable just to bridge the fuse with a little bit of wire?... ahh you know what... those fuses are damn cheap... ill set it aside and wait till i have to order some caps or something.
thanks so much for the help selldoor!

[selldoor]

Re: Toshiba C660D Blown Fuse

It is NEVER advisable to bridge the fuse with a piece of wire.
Even expensive fuses are cheap compared with the cost of repairing the possible damage of using a wire.

[momaka]

Re: Toshiba C660D Blown Fuse

The "T" on top of the fuse means it's a 5A fuse.

[selldoor]

Re: Toshiba C660D Blown Fuse

The "T" on top of the fuse means it's a 5A fuse.

Hi momaka - I dont doubt you but where do you get that- I am trying to build
a list of the different markings - I keep giving up as every make series seems
to use a different one. I thought it was a littelfuse and in the datasheet I posted it suggests T=2.5

Its a minefield - I always used to use this
http://forums.xbox-scene.com/index.php?showtopic=658938
and yes on there it says T=5 but I find more and more that more modern fuses dont match that post.

[momaka]

Re: Toshiba C660D Blown Fuse

Well good thing you brought that up. I thought SMD fuse codes were more or less standard. In the past, I have been using this data sheet from LittleFuse to determine what the codes meant (or at least a screenshot I took from that data sheet - see attached image).

Given that this is the input and that most average laptops can use over 3A of current, I think a 5A fuse (minimum) is appropriate vs. 2.5A.

[luke10050]

Re: Toshiba C660D Blown Fuse

could i replace the fuse with one with a K marking or would that be asking for big trouble? on top its got two w's that are crossed into eachother and then the K

[momaka]

Re: Toshiba C660D Blown Fuse

If you got that from a computer motherboard near the USB ports, it won't work because that's probably a 0.5A resettable polyfuse. Is it green by any chance? If so, it's more than likely a low-current resettable polyfuse.

[luke10050]

Re: Toshiba C660D Blown Fuse

Green, off a graphics card

[momaka]

Re: Toshiba C660D Blown Fuse

Probably still similar current.

[cyberhack]

Re: Toshiba C660D Blown Fuse

the T on the fuse is for time delay if on the fuse is t5a that is a anti surge 5amp fuse.

[selldoor]

Re: Toshiba C660D Blown Fuse

the T on the fuse is for time delay if on the fuse is t5a that is a anti surge 5amp fuse.

Have you any evidence to support that theory.

[ghass]

Re: Toshiba C660D Blown Fuse

hi freinds this problem pathes with me many times i found smd fet under the cpu socket its power cpu fet short i change it with 4407 ics near the fuse its ok