Bosch AL 1830 CV(AL1830CV) blown fuse

[otoluk]

Another victim of planned obsolescence.
BOSCH battery charger from year 2018.
PCB
1 607 503 091-C
PCB4040 Rev0.4 CEM-1 1.6T 10Z
2016-04-19

Fuse blew with nice sound effects. Seems need to replace fuse and resistor. No schematic is available.
Not sure what have caused this will try to replace 400v cap, resistor and fuse.

[stj]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

R1 a MOV looks cracked,
and check the diodes and whatever is on that heatsink for shorts.
you have more bad parts - you need to find them.

[otoluk]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

Have to also decode resistor near V5

[stj]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

0.68ohms?

[petehall347]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

black blue brown gold 60 Ohms 5%
if that's a gate resistor i think the fet took a hit .. best give it a look at anyway

[R_J]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

I suspect the resistor V5 is what stj said, 0.68 as it appears to be the source resistor, I would suspect the mosfet is shorted, D~S and may have damaged the drive transistor V6
I suspect R1 is a NTC thermistor as it is in line with the a/c input not across it.

[stj]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

yes, checked again - inrush limiter.

and probably a good idea to point out that the primary heatsink is connected to rectified mains!!

[otoluk]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

V5 Mosfet(ST P6NK90Z)is short on all pins.
Mains cap(C2) is ok but while others are FZE, FZK and GF series this is noname Acon.
Inrush limiter has same pcb coating which is cracked but part is ok.

yes, checked again - inrush limiter.

and probably a good idea to point out that the primary heatsink is connected to rectified mains!!

Thanks this was unusual as also it is isolated from V5 by
plastic gasket. What for as it limits heat transfer?

[Stuart Coyle]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

This thread just saved me a load of trouble. Have the same issue, with the FET blown and taking out the source resistor and fuse. The source resistor was so charred I could not read the code on it properly. 0.68 ohms matches the couple of bands I can see. Thanks.

[otoluk]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

Did you find a replacement FET or analog?

[otoluk]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

Replaced FET, R7 resistor, fuse and it is still short. Blew fuse and R1 thermistor(8S150L).
Need to look further.

you have more bad parts - you need to find them.

You where right it was not so easy.

edit: two of IN4007R(or 1N4007 ?) diodes are shorted. Should I replace them all with UF4007?

[stj]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

the group of 4 rectifying the mains?
you can use UF if you want, it costs more though.

[otoluk]

Re: Bosch AL 1830 CV(AL1830CV) blown fuse

Yes the group of four.