Hi all,
I have a hobby digital-display charger for multiple types of batteries that has stop working: when I am hitting the charge or discharge button I get an error message "output circuit problem".
I have narrowed down the probelm to this:
Normally , when this model of charger is idle ("on" but not charging anything) is has 60V at the output port. When a battery is connected to the output, the voltage drops to the same as the battery (let's say 12V) and when the battery is disconnected voltage jumps back to 60V.
In my case, when idle the output is 0V (or a very small value) and when I connect & disconnect the battery, voltage slowly drops from 12V back to 0V (in 2 minutes or so).
Looking inside the charger, the basic components look like a 4-switch buck-boost converter plus some power resistors (to discharge the batteries?).
Output capacitors (there are two in parallel) look ok - no distortions.
Do the symptoms described above prompt to a specific component problem, for example to a faulty capacitor? Or I would be better off unsoldering all capacitors, MOSFETs and check them one by one.
I have a hobby digital-display charger for multiple types of batteries that has stop working: when I am hitting the charge or discharge button I get an error message "output circuit problem".
I have narrowed down the probelm to this:
Normally , when this model of charger is idle ("on" but not charging anything) is has 60V at the output port. When a battery is connected to the output, the voltage drops to the same as the battery (let's say 12V) and when the battery is disconnected voltage jumps back to 60V.
In my case, when idle the output is 0V (or a very small value) and when I connect & disconnect the battery, voltage slowly drops from 12V back to 0V (in 2 minutes or so).
Looking inside the charger, the basic components look like a 4-switch buck-boost converter plus some power resistors (to discharge the batteries?).
Output capacitors (there are two in parallel) look ok - no distortions.
Do the symptoms described above prompt to a specific component problem, for example to a faulty capacitor? Or I would be better off unsoldering all capacitors, MOSFETs and check them one by one.
Last edited: