I have a fiarphone 3 and an official fast charger for it. It has now started to have a problem where during use it shuts down - no output voltage.
The first time it happened I left it for an hour and then plugged it in again but it was still dead. I considered attempting a repair but I don't think it would be possible to open it without destroying it, so I ordered a non-fairphone replacement which has been working well.

After quite a long time I plugged in the original and discovered that it was working again. It has done this several times now. It takes more than two days to recover!.

 

It is just an ordinary 5V phone charger, not worth repairing just get another charger..

 

As I said I did get a replacement charger. From my experience of repairing switch mode power supplies, now I know that it recovers after a few days I know that it would be impossible to repair.

Normally when the protection circuit triggers it takes around 10 seconds to 10 minutes to 'reset'. I am curious how this one manages to 'remember' the trip for days.

 

The capacitor charge needs time to dissipate.

 

The capacitor charge needs time to dissipate.

They must have accidentally used a good quality capacitor when they built it!

 

Sounds like an insufficiently sized, failed, or absent bleeder resistor. I would guess the bleeder failed open, though that is pure surmise.

 

Sounds like an insufficiently sized, failed, or absent bleeder resistor. I would guess the bleeder failed open, though that is pure surmise.

And perhaps a failing capacitor is the reason for the occasional tripping?

 

The last three "failed chargers" that I checked had the failure in the cheap construction of the wire to the small USB connector. Pushing on the connection would fix the problem,