kraka
Junior Member level 3
My question is about measurements i made on the resistors of a PCB, which is a component of my PC. All the readings I made in all resistors, one by one, agree with the labels on the resistors , except for two of them. In one the label on the resistor is 4700 Ω, but my measurement shows 40 Ω, and in the other, the label is again 4700 Ω, but my measurement shows 7.60 Ω.
The measurements were made with the resistors on the board.
The strange thing (at least for me who don't have the background as an electronics engineer) is that when I removed these two resistors from the board, and measured them, they gave the correct readings, i.e. 4700 Ω so it means that they are not broken.
After their detachment from the board, if I measure the resistance between the two empty pads of resistor, I find the same reading as when I was measuring, with the resistors on. It is as if the multi-meter bypasses the resistors and chooses a path with the least resistance. I know that current flows in the path with the least resistance, so is this a proof that there is a short circuit somewhere ?
My question is, whether this is an indication that there is a short circuit somewhere in the circuit. Near these resistors there is a PLD (programmable logical device) which is overheated. Is there any chance that the short circuit (if there is) is not in the PLD, but somewhere else ? And how can I locate it ? I don't have the schematic.
My question is about measurements i made on the resistors of a PCB, which is a component of my PC (it is a PCI card). All the readings I made in all resistors, one by one, agree with the labels on the resistors, except for two of them. In one the label on the resistor is 4700 Ω, but my measurement shows 40 Ω, and in the other, the label is again 4700 Ω, but my measurement shows 7.60 Ω.
The measurements were made with the resistors on the board.
The strange thing (at least for me who don't have the background as an electronics engineer) is that when I removed these two resistors from the board, and measured them, they gave the correct readings, i.e. 4700 Ω so it means that they are not broken.
After their detachment from the board, if I measure the resistance between the two empty pads of resistor, I find the same reading as when I was measuring, with the resistors on. It is as if the multi-meter bypasses the resistor and chooses a path with the least resistance. I know that current flows in the path with the least resistance, so is this a proof that there is a short circuit somewhere ?
My question is, whether this is an indication that there is a short circuit somewhere in the circuit. Near these resistors there is an IC which is overheated. Is there any chance that the short circuit (if there is) is not in the IC, but somewhere else ? And how can I locate it ? I don't have the schematic.
note : both of these resistors are connected to one of the I/O pins of the IC (not the same pin)
The measurements were made with the resistors on the board.
The strange thing (at least for me who don't have the background as an electronics engineer) is that when I removed these two resistors from the board, and measured them, they gave the correct readings, i.e. 4700 Ω so it means that they are not broken.
After their detachment from the board, if I measure the resistance between the two empty pads of resistor, I find the same reading as when I was measuring, with the resistors on. It is as if the multi-meter bypasses the resistors and chooses a path with the least resistance. I know that current flows in the path with the least resistance, so is this a proof that there is a short circuit somewhere ?
My question is, whether this is an indication that there is a short circuit somewhere in the circuit. Near these resistors there is a PLD (programmable logical device) which is overheated. Is there any chance that the short circuit (if there is) is not in the PLD, but somewhere else ? And how can I locate it ? I don't have the schematic.
My question is about measurements i made on the resistors of a PCB, which is a component of my PC (it is a PCI card). All the readings I made in all resistors, one by one, agree with the labels on the resistors, except for two of them. In one the label on the resistor is 4700 Ω, but my measurement shows 40 Ω, and in the other, the label is again 4700 Ω, but my measurement shows 7.60 Ω.
The measurements were made with the resistors on the board.
The strange thing (at least for me who don't have the background as an electronics engineer) is that when I removed these two resistors from the board, and measured them, they gave the correct readings, i.e. 4700 Ω so it means that they are not broken.
After their detachment from the board, if I measure the resistance between the two empty pads of resistor, I find the same reading as when I was measuring, with the resistors on. It is as if the multi-meter bypasses the resistor and chooses a path with the least resistance. I know that current flows in the path with the least resistance, so is this a proof that there is a short circuit somewhere ?
My question is, whether this is an indication that there is a short circuit somewhere in the circuit. Near these resistors there is an IC which is overheated. Is there any chance that the short circuit (if there is) is not in the IC, but somewhere else ? And how can I locate it ? I don't have the schematic.
note : both of these resistors are connected to one of the I/O pins of the IC (not the same pin)
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