adrian wrote:
HI Dave

Dave wrote:
Daughter bought her daughters an in car dvd player with 2 screens and
it has decided to break down.

On looking at the cigar plug end of the power cable, I found a blown
fuse, so I changed the 3 Amp for a 2.5 which is all I have in stock at
the moment and it has blow 2 of them so far.

I measured the resistance of the DVD play power input and it measuered
400 Ohms one way and 800 Ohms when I reversed the multimeter leads.
I'm thinking of buying some 5 amp fuses a.m. and see what it does to
them.

I could conect it up to a variable power supply and see what it is
drawing through, but I thought that this was an unusual thing to happen.

Any ideas anyone? Or does it have to go for repair?

Dave (a bit out of touch with this DVD technology.)

I'm not clued-up on DVD technology either - but replacing a blow fuse
with one of a higher rating is a strategy that's a bit on the
'dangerous' side. There's a good chance that the original fuse blew for
a reason - and by just giving it more 'welly', you may end up blowing
more than the fuse...

A fuse is there to protect the wires. Upping one from 3 to 5 amps should
not cause a fault in the system. If it did, then the system already has
a fault in the first place.

Was the player bought 'new'? If so, replace the 3A (blown) fuse - take
it back and play dumb 'It stopped working'....

It's out of warranty :-(

You could put an amp-meter in line and see how much current it's taking
- given that there's probably a fault condition, it's probably pulling
more than 3A (to blow the fuse - a lot more than 3A!) - so watch out
that you don't blow the amp-meter as well..

Whenever I measure curent, I always fall back onto my trusty Avo. No
internal resistance on Amps. So no problem with blowing it, unlike the
modern units.

Return for refund, or get it repaired....

It's looking like a repair at the moment.

Dave