Laptop PSU repair
The problem
Dont have your laptop charger between sofa cushions while it is plugged in.
Teardown to find the damage
Opening the laptop charger is a bit difficult since it is glued/melted
shut.
Both plastic halves needs to be cracked.
Some measurements
Diode bridge could be measured, found to be shorted.
Testing the remaining parts
On the pcb, measuring the mosfet and checking the coils for shorts, nothing awry could be found.
I replaced the broken retifier bridge and added a new fuse.
A minifuse from a car, cut and soldered in place.
It fits nicely.
As it is already cracked open i decided to add a
little upgrade.
I cut the positive output wire and installed a
KDS9700 @50°C
Charger is now heat cut-off upgraded : )
Testing
It starts fine when plugged in.
10W LED run for a while, no problems.
All is ok, still in use today