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ID for inductor and capacitor

JonnyB1975

New Member
Hi everyone, new to the group. Over the years I've done quite a bit of hobbyist electronics and general home repairs.

My dad burned out two parts of a PCB by using the wrong power supply. I'd like to fix it for him as a favour.
The inductor is burned so I can't ID it, the capacitor has exploded.
I have had a look online for a board schematic or info sheet but no good so maybe someone could help me?
 

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Hi everyone, new to the group. Over the years I've done quite a bit of hobbyist electronics and general home repairs.

My dad burned out two parts of a PCB by using the wrong power supply. I'd like to fix it for him as a favour.
The inductor is burned so I can't ID it, the capacitor has exploded.
I have had a look online for a board schematic or info sheet but no good so maybe someone could help me?

If you mentioned the make and model, perhaps someone might have a circuit?.

However, neither the capacitor or inductor are likely to be at all critical - presumably your dad either used a power supply with the wrong polarity, or one of much too high a voltage?.

The capacitor is most likely a supply decoupler, and something around 47uF should be fine, the inductor is probably more filtering on the incoming supply - and easily replaced with a bit of wire, or a low value resistor.

Of more concern is what other damage might have been done, this sort of catastrophe often kills large chips etc.

If you've got a bench power supply?, set it to the correct voltage and a low current setting - clean the capacitor debris away, and apply the power supply straight across the capacitor pins (it 'should' work without the inductor or capacitor). Monitor the current from the bench power supply, to make sure it's not drawing excessive current - if it doesn't work like that, then something else (like that big chip) has probably been killed.

If it does work, then fit a new capacitor (47uF should be OK) and a 1 ohm resistor (or a piece of wire) for the inductor.
 
Nigel, thankyou for such a helpful and informative reply, I do have a bench supply so I will give it a go.
Thanks again for sharing your excellent knowledge
 

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