Sony PCG-FX140, PCG-FX250, and PCG-FX340 problems ...

This is the first time I've posted for all three ailing laptops at
once. I've taken the opportunity to do certain things because I have
at least two laptops for parts swapping.

PCG-FX140:
No response from the AC adapter (confirmed to be functional). Powered
from the battery, the bezel lights blink in alternation from the power
and battery lights at once, to the "lock" lights (Caps, Num, and
Scroll) at once. It keeps it up until I release the power button. I
changed the LCD harness (part number's the same for both harnesses),
but I didn't regressive test the laptop before exchanging.

PCG-FX250(K actually, but that doesn't matter here):
Water damage special with absoultely no response, despite changing
power sources (AC adapter and battery) and swapping CPUs, too from the
FX340. Supposedly water seeped into the PC card slots. I'm really
really really hoping it's just the power supply, but I don't know how
to swap 'em.

PCG-FX340:
The power lights come on, but there's no response afterwards. I tried
reseating the CPU and using the FX250's CPU. Same response.

I've tried with the battery in both bays, too.

Anything else I can try, given these three laptops?

Thanks for reading!