Help with SMD cap identification/replacement

Thread Starter

basil_555

Joined Oct 20, 2021
15
Hi,

I need to identify the cap marked with yellow. It is placed on power rail 6.2-16.8V. It is short circuited, but the one nearby which looks the same is measured as 185uf with transistor tester. Any thoughts?

20211020_142037_2.jpg
 

dl324

Joined Mar 30, 2015
13,527
While it is sometimes possible to get valid readings on components in-circuit, that's the exception, not the norm.

Was the cap you measured also across a power rail? If you measured the "bad" cap as shorted and it's on a power rail, it's likely that some other component is shorted and is in parallel with the cap.

What test equipment do you have?
 

dl324

Joined Mar 30, 2015
13,527
I used transistor tester TC-1.
Does powering the board to troubleshoot cause problems? Can the power source tolerate a short on it's output?

Do you have a soldering iron and are you competent enough to remove the cap you suspect is shorted without causing more damage?
 

dl324

Joined Mar 30, 2015
13,527
The board constantly reboots when powered. Power source can tolerate a short.
If you have a DVM with enough resolution, you can look for the lowest voltage on the power rail.

If you have a current tracer like the HP547A, you can look for the highest current on the net.

If you don't have the proper equipment, you can remove the cap you suspect is shorted.
 

Thread Starter

basil_555

Joined Oct 20, 2021
15
f you have a DVM with enough resolution, you can look for the lowest voltage on the power rail.

If you have a current tracer like the HP547A, you can look for the highest current on the net.

If you don't have the proper equipment, you can remove the cap you suspect is shorted.
Thank you so much!
 
Top