What image is installed in the MIO? (Main Menu--->About)
LO/L, LO/H and threshold all at 10750 will work. You may also use Circular lnb setting in Non-TNAP images, or I think Standard lnb setting in TNAP images.

Blindscan is your best friend right now. Blindscan is the best way to check for signals when aligning a dish imo.

Most likely, The lnb is fine, and I would not worry about replacing it.

Transponders 12145v and 12182v are very strong on 103w. They are also DVB-S, which explains why you only get these two transponders.

You do not have a motor installed, correct?

For a fixed dish, Without a motor:
Try to make the signal "Bigger" on either one of these transponders . Lnb skew is important, so get a signal and very slowly rotate the lnb a bit.Understand where the lnb is skewed before you rotate it so you may return it to its original position if needed. Try skewing the lnb in the opposite direction as you may have skew reversed.

Slightly pull/push on the right, left, top, and bottom of the dish while watching the signal meter. Does the signal improve or get bigger when you do this?

You are just barely on this satellite. Here are some screencaps from a 1.2 meter dish and Edision receiver. The signals on your dish when tuned will probably be slightly less.

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[Only registered and activated users can see links. ]