Jerry G. wrote:

The only way to do this, without delaminating the boards are with the use of
X-Ray equipment. Then there is the task of deciphering what you see. IR will
be of too long a wavelength for any type of detail, and is of heat in
characteristics. UV is a very short wavelength of light, but does not
penetrate or pass through many types of materials. UV would not be visible,
and is difficult to decipher in visual detail.
snip

I'm not convinced IR's wavelength is too long to be useful. I've used
IR film (although it was quite a long time ago), and the images can be
quite detailed. If microscopic features were the issue I would probably
agree. As the OP pointed out, some camcorders have an IR mode, too,
which could be useful.

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