This question pertains to a Sony GRX560 notebook computer with a defective SODIMM socket.
The condition only affects chip select (chip present?) at boot time. Specifically, in order for the system BIOS to scan the installed memory module, external downward pressure must be exerted on the module ONLY DURING BOOT. Once the machine starts loading the OS, the module can be left alone. PC continues to operate fine until next power off/on, at which time the RAM module is not found unless downward pressure is exerted on it during boot only.
Once the system is booted, it continues to run without incident and is able to utilize the installed RAM.
This sounds like a poor connection with perhaps as few as one pin connection.
My question is, on this 200-pin SODIMM socket, which pin carries the "chip present" signal to the system mainboard?
There are simply too many pins for me to focus on all at once, but if I can narrow down to the specific pin, perhaps I can effect a repair by bending that pin outward a bit, or inserting a microscopic sliver behind it to add spring tension to it.
Ultimate solution is to replace socket, which I would like to avoid, if at all possible, due to the difficulty involved with SMD rework.
Any information on the pin functions of the socket?
-- Best Regards,
Mark A. Weiss, P.E.