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Old 06-07-2021, 06:50 AM   #1
otoluk
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Default Bosch AL 1830 CV(AL1830CV) blown fuse

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.
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Old 06-07-2021, 09:35 AM   #2
stj
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Default 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.
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Old 06-07-2021, 01:40 PM   #3
otoluk
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Default Re: Bosch AL 1830 CV(AL1830CV) blown fuse

Have to also decode resistor near V5
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Old 06-07-2021, 03:20 PM   #4
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Default Re: Bosch AL 1830 CV(AL1830CV) blown fuse

0.68ohms?
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Old 06-07-2021, 04:05 PM   #5
petehall347
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Default 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

Last edited by petehall347; 06-07-2021 at 04:07 PM..
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Old 06-07-2021, 08:48 PM   #6
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Default 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.

Last edited by R_J; 06-07-2021 at 08:57 PM..
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Old 06-08-2021, 01:42 AM   #7
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Default 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!!
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Old 06-09-2021, 01:28 PM   #8
otoluk
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Default 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.

Quote:
Originally Posted by stj View Post
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?

Last edited by otoluk; 06-09-2021 at 01:31 PM..
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