How can i convert 19v output supply into 13v

 

LM317 !

 

How can i convert 19v output supply into 13v

What's the maximum current?

 

Is the picture supposed to tell use something?

 

Off the shelf buck converter module.

 

Off the shelf buck converter module.

LM2596

 

Is the picture supposed to tell use something?

Yes. It's an example of horrible connector wire soldering.

 

How can i convert 19v output supply into 13v

To answer your question literally: You might be able to change a resistor in the feedback network to make the output 13V instead of 19V.

 

How can i convert 19v output supply into 13v

By changing the resistors on the Lm358 pins 2&3, looks like one half senses Voltage and the other half does current, .
Can you take a full picture of the circuit board.