1. led does light up
2. can only give 1.2V
This is not good. It implies that you have something wrong with the regulator chip (U2).
3. seem ok without bridges
A very close-up pic would help to make sure.
4. do not understand your meaning?
If you get solder on the metal top of the oscillator chip (X1), it's possible to create a short. The solder should cover the exposed metal at the four places on the sides of the chip, but cannot extend over to any portion of the metal top.