Start with the bad chip first and then test the board and see if it works. If yes, then continue replacing the others. replace a couple at a time and test the board, this way if something happens you can check your work and do a fix before continuing. Nothing worse than replacing all the chips at once and end up with a Sad Mac and you do not know which ones are at fault. And take your time with it.
Recently I was working on a Raspberry Pi and its twin somebody decided to take their foot to them, crushing the USB Ports. I replaced the USB Port on one of them and it works fine, thing is, the Pis use Black Plastic USB Ports and I used White ports- which is a minor thing. But on the other Pi, I used have used too much solder and shorted out a pin or two on the Pi, though it booted up, it comes up with an error of "Overvoltage on Port 2" - one the USB Ports. The next day I desoldered the replacement USB port neatly, cleaned up the board, checked the USB traces to the chip and then put the removed replacement USB Port back in, being a little stingy with the solder this time. Now it works like the day it came out of the factory! I got these two Pis as a pair from Ebay for less than $20 each, including S/H. And they now got White Ports, LOL!
Lesson here? So solder wisely and only use enough solder to close the joint. Inspect you work on both sides and then continue to the next pin. For me, the I could only see one side of the Pi, but I left huge solder balls on each pin - a sign of too much solder used.
Recently I was working on a Raspberry Pi and its twin somebody decided to take their foot to them, crushing the USB Ports. I replaced the USB Port on one of them and it works fine, thing is, the Pis use Black Plastic USB Ports and I used White ports- which is a minor thing. But on the other Pi, I used have used too much solder and shorted out a pin or two on the Pi, though it booted up, it comes up with an error of "Overvoltage on Port 2" - one the USB Ports. The next day I desoldered the replacement USB port neatly, cleaned up the board, checked the USB traces to the chip and then put the removed replacement USB Port back in, being a little stingy with the solder this time. Now it works like the day it came out of the factory! I got these two Pis as a pair from Ebay for less than $20 each, including S/H. And they now got White Ports, LOL!
Lesson here? So solder wisely and only use enough solder to close the joint. Inspect you work on both sides and then continue to the next pin. For me, the I could only see one side of the Pi, but I left huge solder balls on each pin - a sign of too much solder used.