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In some cases, some pins of the socket will give the same reading with or without the IC's installed, assuming the circuit is built correctly and there are no other problem components. However, if that was known to be true, there would be no reason for measuring those voltages in the first place.
In general, you should assume that any voltage measurements performed without the IC's installed are not going to tell you anything useful. Checking voltages without IC's present is mainly useful when you compare those readings to the readings when the IC's are in place. This kind of troubleshooting is often used to check for dead IC's, and relies on you to know what the readings should be, and how they might change with a damaged chip.
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