jjlonbass wrote:Just a thought, the service manual shows the artwork for each of the PCBs and it can be seen that board 1 is double sided i.e. it has PCB tracks on both sides.
Double sided PCBs usually have through plated holes that join the top PCB pads to the bottom ones. However, if this board doesn't have through plated holes for all of the 4514 pins you won't be able to use an IC socket and also you'll need to solder the IC's pins to both top and bottom side pads.
You can check for this by removing the old chip and measuring the resistance between the top and bottom pad of pin 2 for U104 which only shows a blue PCB trace on the artwork, then repeat for the top and bottom pad of pin 23 which only shows a grey PCB trace. If you see roughly 0 ohms in each case then the board is through plated and you can use your IC socket.
Thanks again - we'll double check that when we get back in there.
We actually did cut the pins of the old chip in order to remove it and I'm not sure how the traces came loose. Unfortunately the pins didn't fall out of their own accord but we stood the board up and worked from both sides to remove the pins. It worked well!