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I am an electro-tech student and I was wondering what would happen if I used a diode that was too big. The tv I am working on requires a diode (in5406) and I only have (in5404) and (in5408) at my disposal.
I have never heard this before. I just checked the datasheet and the full range of 1n540# diodes have a forward voltage of 1.2V. Where did you hear this?In your application, the 5408 higher voltage rating has no consequences. Generally speaking, as the voltage rating of a diode increases, so does its forward voltage drop (Vf) at any particular current compared to other diodes in the same series with lower voltage ratings. This almost never is a problem, but can affect efficiency if you are sweating every milliwatt.
You need to reread the above posts.Poms, its the reverse voltage they were talking about, that is how much voltage the diode can withstand when its off.
Forward voltage (0.6v) is not often considered except for high power applications such as switching supplies where schottky diodes are often used which have a forward voltage of 0.4v or thereabouts.