Measure R35. If R49 and R34 are being damaged, I can't see any reason other than R35 being shorted, or at least much lower value than the 100 kOhms that it should be.
As it's a switch mode power supply, that may not be the only failure. If R35 is shorted, U7 may be damaged. R52 is doing a very similar job to R35, and is exactly the same specification, so it may have failed as well.