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OK so its looking difficult to achieve visualy without xray. Assuming a dry/broken joint beneath the BGA, and I remove the BGA, reball it with solder. I manufacture a device using mirrors and a beamsplitter to combine the 2 images from, below the BGA and above the target pads on the pcb to...

I am trying to see the condition of the balls under the bga and check alignment etc. thanks Roy

Thanks all, for the replies. I realise that the gap would be smaller than 1mm, I just wondered if it was possible to have some sort of fine fibre that would allow you see the condition of the underneath of a BGA. I know technology exists to view the underneath by video using a right angled...

Hi I am a total optics novice and I am trying to design a low cost device to display a video picture of the underside of a BGA chip soldered onto a PCB. I wondered if I can feed a very small fibre optic(<>1mm) under the chip and with some backlight get the result into a CCD camera. or use a...