Identifying blown components-3D Finder

Thread Starter

srecenvid

Joined May 10, 2018
24
Hello,
i am trying to fix my cnc 3D Finder, sadly i cant find any schematics for pcb so i need some help. I have 2 components visibly damaged/blown up. I made some close pictures with microscope but i am not able to see any smd code on what i assume it is resistor. I was able to read code on SOT-23-8 (my assumption) 8-pin smd. It is G9C, but no result were fond so far. I have no idea how to find right parts unless someone of you can help me :)

area.jpg Closeup.jpg Undsoldered.jpg
 

AlbertHall

Joined Jun 4, 2014
8,369
I found quite a few components coded G9C but none of them have 8 pins.
The 9C looks clear enough but are you sure the the first character is G?
 

Thread Starter

srecenvid

Joined May 10, 2018
24
Yes i am sure. There are some more close pictures. On the bottom is also some marking 7D (at least what i think).3.jpg 42.jpg
 

Thread Starter

srecenvid

Joined May 10, 2018
24
So i think i found right part. According to datasheet and DG449DS have marking on the chip G9x. Also i checked pcb pins and it corresponds to one in datasheet. Now real question is what resistor do i need? When i measure blown resistor (or maybe its not) it is 15Ohm. Datasheet for DG449DS dont have any useful information for resistor.

https://www.vishay.com/docs/73897/dg449.pdf

Any help is welcome :)
 
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