How to repair a dead capacitor

How to reform a capacitor?

The better way to reform such capacitor is by giving a controllable voltage at its rating point with a resistor in series. Then we can see the current movement inside the circuit with a Volt-meter across the resistor. Off course the best way is to use specific reformer device, like Sencore LC-102 (which I’m too lazy to power her up).

How do I find a replacement capacitor?

Now we will start searching for replacement capacitors. First, go to the website of your electric components distributor and go to the Aluminum Electrolytic Capacitors section. Narrow the search by entering the capacitance (uF) and voltage (V) values of the old capacitor. You may also want to check the box to only show components that are in stock.

How to replace electrolytic capacitor?

Tip1: If a capacitor has long enough leads exposed on the front side of the board, you can cut the capacitor off leaving the old leads and solder the new capacitor to the old leads. This method is even faster. See the last picture for an example. Tip 2: You should replace all the electrolytic capacitors, not just the visibly bad ones.

How do you reassemble a capacitor?

There are 2 methods you can use: 1. Heat one capacitor lead and lift the capacitor lead slightly out of the board. Keep doing this until the capacitor is free from the circuit board 2. Desolder both legs of the capacitor, then pull the capacitor out of the circuit board. To reassemble your device, follow these instructions in reverse order.

How do I know if I need a replacement capacitor?

That subtle "popping-up" is exactly what you're looking for. Make a note of the polarity of the old capacitor, and mark the exact values you'll need for the replacement: capacitance and voltage/temperature ratings (these may be written on the part itself, or you can look up the part number).

How do you remove a capacitor from a circuit board?

Press the tip of a heated soldering iron directly onto the solder joint on the back of the circuit board that is holding the old capacitor down. Hold on to the capacitor itself with your other hand. As the joint melts, you can feel the tip of the iron fall into the hole of the circuit board.