Why the SMPS gives normal 24 V if Q is used but 35 V otherwise

[abdulbadii]

As try fixing SMPS having improper lower current than the output rating 2.5 A 24V, encountered that the SMPS gives output 24 V if Q is used in normal i.e. jumper is closed, but 35 V otherwise, all without sufficient current/power produced as the claimed rated one



Any clear make-sense reasoning why it is so, and what is the culprit that fails having the proper, adequate current/power, so that can troubleshoot and fix the best way?

[Zero999]

The schematic doesn't make any sense. Check you've reversed engineered it properly.

What sort of SMPS is it? Does it take mains as input? I can't see a bridge rectifier and smoothing capacitor.

[tunk]

Photos, both sides?
Wouldn't have a clue, but R4+R5 could look like a TL431 divider.