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I purchased a SZBK07 CCCV Step Down Buck Converter and I was hoping to remove the TRIMPOT and replace with a potentiometer how ever there was a Orange SMD thing bridged between the 2 and 1 pin's on the PCB, This has fallen of and I can not find it. I replaced the Trimpot with a potentiometer of 100k (Same as trimpot W104) it how ever smokes and the output voltage does not adjust, I tried a 330ohm resistor in place of the unknown SMD but this just makes the LED light on the buck not turn on and output is 1.5v non adjustable. The Potentiometer is for the VCC as in the diagram below.

enter image description here IMAGE OF SMD (White in this case directly below the orange wire on the two pins)

DIAGRAM OF SZKB07 enter image description here


Here is another picture:

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  • \$\begingroup\$ If the component was orange/brown, and jn the picture white, think it must be a SMD capacitor. Does the potmeter have the same power rating as the trimpot? \$\endgroup\$ – Huisman Oct 11 '19 at 20:39
  • \$\begingroup\$ Without a better picture this may just be a metal "jumper", however your diagram is just an example circuit for the LM25116 out of the datasheet, and isn't representative of the board. If we knew what those connectors are and where they go, this may be easier to answer. \$\endgroup\$ – Ron Beyer Oct 11 '19 at 20:45
  • \$\begingroup\$ @Huisman Yes both were 100k ohm \$\endgroup\$ – Kieran Read Oct 11 '19 at 20:55
  • \$\begingroup\$ @RonBeyer Sorry I will try and find a better picture, As I am missing the SMD I can't take a picture of it sorry. \$\endgroup\$ – Kieran Read Oct 11 '19 at 20:56
  • \$\begingroup\$ @KieranRead 100kW? :D ... Check the power rating (in watts) instead of resistor value. \$\endgroup\$ – Huisman Oct 11 '19 at 20:58
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I was testing this part.

It is a capacitor, 580 nF.

enter image description here

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