Smd identify

hi there i have a question about 2 parts i have blown a pcb now i want to repair it by replacing the blown components but they are burned that bad i cant identify them

i have a picture of them before the blow but i cant find them to buy/order new ones
Burned


Before F1 (smd 0)

Before (Q2 & Q3) (smd DA QX)

i hope someone can tell me what the modelnames are of the parts or where i can order them or alternative where i can replace them with

Hello nld_evinx and welcome to the forum;

The FS1 silkscreen print would typically callout a fuse, the JP1 silkscreen print would typically callout a jumper.

If true for this board then a zero ohm smd resistor would work for JP1, I would not know what the limits for the fuse would be on FS1.

thanks for the welcome :smiley:

jp2 is not in use

its only about the

FS1 / Q2 and Q3 component

on the Q2 and Q3 is the text “DA QX” but i cant find this coding anywhere what is can be

FS1 i think its a SMD 0R like the before picture shows

but the Q2 and Q3 i cant identify

The DA QX I think is a 2SD1664-Q which is obsolete, but the recommended substitutes are this transistor and this transistor. Both have the same package as the original.

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Hi nld_evinx,

I suspect you’re right that the part placed in the FS1 spot is probably a zero Ohm resistor, based on the marking of the undamaged part. However, based on the damage you have, it wouldn’t surprise me if the designer had intended for an actual fuse to be placed there rather than a zero Ohm resistor, especially since they mark the spot with “FS1” rather than “JP1”.

I have no idea what fuse current rating would make sense, but that might have protected your other components.

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its a original product i didn’t change anything or build it my self so the FS1 zero Ohm Resistor is from factory default

but thanks for your information

its a interface for HVAC installation to connect with PC but someone connected it powerline (230V) that caused the damage normally it is connected on a busline with 12-24dc

thanks for your input

where can i buy except from digi-key
i mean not that i want buy else where but for 4 items total price €1.40 and shipping kost €22.00 is just insane