It sounds like the CMOS voltage didn’t drop low enough to scramble the CMOS RAM.  There are at least three possibilities: 1/ You didn’t remove the CMOS battery. 2/ You removed the battery, but the voltage didn’t drop low enough. 3/ The cmputer uses an EERPOM memory instead of a CMOS RAM.

For 1/, I’m not sure what the CMOS battery looks like, but it strikes me that the CMOS battery should be a replaceable part. So if you find it in the Sony parts area, that’s a possible way to confirm. Also, a new CMOS battery when you’re done might not be the worst idea.

If 3/ is your situation, it’s probably best to send your computer to Sony.

I can help you with possibility 2/. You can touch the two battery points on the mother board together. This will short the motherboard and zero the voltage.

If you have a 1K-ohm resistor, it’s safer to connect the two points through the resistor, just in case you don’t have the right points. With a resistor, leave the points connected for 30 seconds or so. A 1 K-Ohm resistor for 30 seconds should pretty much guarantee the CMOS voltage goes to zero. Should the CMOS battery still be attached, there’s a good chance it won’t be damaged by the 1K-Ohm load for 30 seconds. If you have a volt meter, you can attach it to each side of the resistor and see for yourself what the voltage is. Without a battery, the CMOS voltage should drop quickly. A voltmeter can also measure the voltage across your component, and help you make sure the component is a battery. You’re probably looking for something between 1V and 1.5V.

Don’t short the CMOS battery - just short the mother board terminals where the battery was connected.

Good luck!