Re: help id'ing a diode from a Toshiba laptop (see pic)


Franc Zabkar wrote:
On 16 Dec 2006 12:18:40 -0800, "Carl" <neo0x6@xxxxxxxxx> put finger to
keyboard and composed:

Franc,

Thanks for the reply. The 12Amp fuse did survive ok.

What happened on the polarity error was that this diode literally
fried/smoked (I'm glad I had a pic saved of the board). I plucked it
out in little broken pieces.

Can you help with best make/model/specs for a good replacement of this
type rectifier?

The fuse rating seems odd, so I can't suggest a suitable diode. In any
case you need to find out why your Schottky rectifiers are failing.
Assuming you've corrected your polarity error, then the PIV rating
(30V) of the CMS01 should be more than enough for this circuit, unless
I've misunderstood the workings. Is D1 connected between 19V and
ground?

PC1, PC2, and the diode all are between +19V and ground.

I am also curious about the purpose of this diode, and if I can power
the laptop safely without it. This would be my assumption if its just
for reverse current protection.

The Schottky's may be failing because of the current? They are rated
at 3A (max).

They may be failing due to heat? Rated at 100deg C. (125 max)

In any case, I am up for a best educated guess on replacement specs.
You mentioned an ordinary rectifier.

Also note the situation in which the Schottkys failed... they worked
fine on powering the battery, and if the notebook was idle, but when
running some intensive apps, pop- it shorted.


The power supply specs are 19V ~ 6.3A

Then maybe I'm wrong about the 12A fuse. Also, PC3 appears to be the
main bypass cap, not PC1 or PC2. The latter probably provide HF
bypassing.


Thanks, this is a bit of a puzzle,

Carl
neo0x6@xxxxxxxxx

.

Relevant Pages

  • Re: Marshall 2203 eats fuses
    ... Even with pulled power tubes the fuse blows. ... Shorted preamp tube ... Shorted output tranny (but it'd take out the HT fuse first). ... First I'd do a diode check using your DMM's diode checker. ...
    (alt.guitar.amps)
  • Re: help iding a diode from a Toshiba laptop (see pic)
    ... The fuse rating seems odd, so I can't suggest a suitable diode. ... Assuming you've corrected your polarity error, ... ordinary rectifier. ...
    (sci.electronics.components)
  • Re: What kind of part is this?
    ... > Working on a sony PSOne video display with no documentation. ... > First problem was a tiny fuse of some sort; ... I would say that it is almost certainly a diode, and if it's right after the ... Assuming that it is a diode, and even being a surface mount type, it should ...
    (sci.electronics.repair)
  • Re: TECH: Stern Hot Hand Issues
    ... The transistor ... replaced both connectors and headers on J3 of the SDB. ... Any chance the diode was facing in the wrong direction to begin ... Could you specify which fuse is blowing. ...
    (rec.games.pinball)
  • Re: Diode vs TVS
    ... 12V battery, 100A fuse, diode. ... The fuse is blown, of course; ... >> come into play ... told me that the time constant goes as the square of the linear ...
    (sci.electronics.design)
Quantcast