Bosch AL 2450 DV battery charger broken

Thread Starter

Mbay

Joined May 16, 2022
2
Hi all.
I'm an absolute beginner when it comes to this stuff but pretty confident in repairing.

I bought a cheap bosch charger in the title knowing it may or may not work. Low and behold it doesn't.

I've managed to take it apart and look at the board. I can't see any damaged parts or burnt parts.

I have however got a thermal camera.

This shows a resistor heating up to near boiling point. Not sure if it's supposed to do this.

Another piece heats up also but not sure what it is.

I have uploaded pics of the thermal and pics of the heating up resistor and other part.

Any help I appreciated. 20220514_114454~2.jpg20220514_114429~2.jpgIMGT0529.PNG
 

Dodgydave

Joined Jun 22, 2012
10,310
It's a NTC thermistor, for preventing inrush on a switchmode psu, if it's getting mad hot then sounds like the Mosfet or bridge rectifier is blown.
 

Thread Starter

Mbay

Joined May 16, 2022
2
It's a NTC thermistor, for preventing inrush on a switchmode psu, if it's getting mad hot then sounds like the Mosfet or bridge rectifier is blown.
Thanks for the reply.

Excuse my ignorance but not a clue what your talking about.
What is the mosfet or bridge rectifier and how do I test it?
 

dendad

Joined Feb 20, 2016
4,135
I would advise you against trying to fix this as your comments indicate a lack of knowledge needed to safely work on it.
Electronics is a fun and very worthwhile field to get into but start with something safer and easier.
This charger will have lethal voltages present and is quite dangerous for novices to try to work on.
Please do not take this as a negative comment, just a warning.
And do look at non mains operated things to start with.
There are quite a number of good sites to learn about electronics. For example...
https://www.learnabout-electronics.org/
https://www.allaboutcircuits.com/textbook/
https://www.allaboutcircuits.com/video-tutorials/
 

Dodgydave

Joined Jun 22, 2012
10,310
Thanks for the reply.

Excuse my ignorance but not a clue what your talking about.
What is the mosfet or bridge rectifier and how do I test it?
These are switchmode type power supplies, they use Live mains power and drop the voltage down without any isolation , so are Very Dangerous to work with.
I strongly advise you put it in the bin or give it to someone who knows what they are doing.
 
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