How to connect LVDS signals to oscilloscope?
The standard way used in my lab to probe high speed signals is a 1k resistor to the target, directly feeding a 50 ohm coax, grounded on the board close to the signal, into a 50 ohm scope input, optionally with a DC block capacitor in series if the DC loading cannot be tolerated

The rationale behind this 


a 1k resistor has much lower loading capacitance than any inexpensive scope probe (you can buy really nice high frequency low capacity probes at a price)
any high speed line will likely be 50ohms or a similar low impedance, which will not be troubled by 1k loading
if you are working on high speed signals, then your scope has 50 ohm inputs
a 1k resistor per line is a low price to pay (in area as well as cost) for the ability to probe a finished and working board


The coax is terminated by the scope in its characteristic impedance, so presents a 50ohm load to the 1k resistor, resulting in a nominal 26dB signal loss flat from DC to several GHz, depending on the size of the resistor and the tightness of the grounding.

With LVDS, you can probe just one of the lines and assume the other, if you're debugging software, or probe both on two scope channels to make sure the sending hardware is behaving as it should.