The connection shown in the 3rd image down from the top, is a dry solder joint. The old solder on this joint needs to be removed and the board connection checked and if still OK the component resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
If you ''gently'' push the component leg on the other side of the board down, you may be able to actually see it move on the soldered side, showing that it is not connected properly.
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Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat built up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
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Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat build up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
A good soldered connection should have no resistance at all to the current flow.
The connection shown in the 3rd image down from the top, is a dry solder joint. The old solder on this joint needs to be removed and the board connection checked and if still OK the component resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
If you ''gently'' push the component leg on the other side of the board down, you may be able to actually see it move on the soldered side, showing that it is not connected properly.
Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat built up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
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The connection should have no resistance at all to the current flow.
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A good soldered connection should have no resistance at all to the current flow.
The connection shown in the 3rd image down from the top, is a dry solder joint. The old solder on this joint needs to be rmoved and the board connection checked and if still OK the component resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
+
The connection shown in the 3rd image down from the top, is a dry solder joint. The old solder on this joint needs to be removed and the board connection checked and if still OK the component resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
If you ''gently'' push the component leg on the other side of the board down, you may be able to actually see it move on the soldered side, showing that it is not connected properly.
Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat built up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
The connection should have no resistance at all to the current flow.
The connection shown in the 3rd image down from the top, is a dry solder joint. This joint needs to be resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
+
The connection shown in the 3rd image down from the top, is a dry solder joint. The old solder on this joint needs to be rmoved and the board connection checked and if still OK the component resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
If you ''gently'' push the component leg on the other side of the board down, you may be able to actually see it move on the soldered side, showing that it is not connected properly.
Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat built up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
The connection should have no resistance at all to the current flow.
Hi,
The connection shown in the 3rd image down from the top, is a dry solder joint. This joint needs to be resoldered so that there is a solid connection i.e. 0 (zero) Ohms between the component leg and the circuit board connection.
If you ''gently'' push the component leg on the other side of the board down, you may be able to actually see it move on the soldered side, showing that it is not connected properly.
Because it is a dry joint it is a resistive connection and that is why there are scorch marks, due to the heat built up caused by the power dropped across the connection. Ohm’s Law P = I^^2^^ x R Power (heat) equals the current squared multiplied by the resistance.
The connection should have no resistance at all to the current flow.