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I have a PCB with burnt component, which is numbered as CFGx and there is an "O" on the component:

image taken from an identical board but from the internet

I looked up but was not able to find anything. It might be configuration related and not specific for the type of the component. There are exposed pads with no component with a similar numbering: other CFGs

I wonder what the components in the original image are. I suspect that they are fuses with 0 ohms.

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    \$\begingroup\$ Do Help identifying an SMD component and What is the usage of Zero Ohm & MiliOhm Resistor? help? \$\endgroup\$
    – Chester Gillon
    Commented Nov 9 at 20:21
  • \$\begingroup\$ Why do you said ‘burnt’? Have you tested them? \$\endgroup\$
    – user317139
    Commented Nov 9 at 22:05
  • \$\begingroup\$ It was in a device, where I misconnected (same connected different parts) something. Some other component was on this line. I think that the current was too high on the component and the component burnt. \$\endgroup\$
    – Saren Tasciyan
    Commented Nov 10 at 12:18
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    \$\begingroup\$ @SarenTasciyan Any component can be a fuse if you put enough current through it, though often not a very good fuse. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Nov 10 at 17:37
  • \$\begingroup\$ I think in this particular case it worked. I later found out that a single "0" means not a very good 0 ohm resistor. Perhaps, that's why this blew up before other things such as traces. \$\endgroup\$
    – Saren Tasciyan
    Commented Nov 12 at 9:23

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They are 0Ω "resistors" (same form factor as regular resistors but very low resistance). They are not fuses. It's a '0' rather than an 'O'.

CFG stands for "configuration". They are jumpers used for some kind of configuration (by their presence or absence some selection is made).

Here is a datasheet from resistor maker Yageo. You can see the jumper specifications such as maximum 50mΩ resistance and maximum allowable current.

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