We have had a large percentage of our recent 532 purchases fail or arrive DOA. We are not exactly buying hundreds of units but 4 of our last 8 boards have been affected. They are not powering up properly, either no or weak LED and no ethernet or serial port activity. One worked for about 12 hrs and then failed like the others.
Anyone else notice similar issues with recent purchases (left 6 weeks or so)?
Thanks
There was a short run of the 532s that had a supply issue..
You can use an OHM meter to check out “D20” on the 532.
(Left side about midway on the board)..
I has 4 of them in a batch.
I fixed them myself, but contact your reseller and they will take care of you.
MikroTik is aware of the run and has corrected the issue in MFG.
(I worked with them and wisp-routers)
Craig
Hey Craig -
What about “You can use an OHM meter to check out “D20” on the 532” - what am I looking for? I got one of those boards - only one… I have a micro/mini certification - repairing this should not be a big issue. I just don’t know what I am looking for and what the repair is… A better hint would help 
Thanks Craig.
Thom
Sory, didnt mean to be vauge..
Do all test with the unit COMPLETLY unplugged.. NO power. no POE, NOTHING…
Put the Ohm meter in Diode test mode. (easy test)..
place the probes accross D20.
You should hear a continouse beep…
(You could also use ohm mode, it should read 0 ohms).. it is a fuse placed in place of a diode.
If you read “open” or your reading goes to zero but then starts to rapidly climb, then the fuse is open and needs to be replaced.
Std disclamer: Your Dist / reseller can repair / replace the board for you.
MikroTik nor I can be responsable for damages to you board or other devices
if you address this issue yourself..
Craig
Craig -
Thanks for the info - any hint of the value of the diode - is it a power diode, zener, tunnel, etc? Hate using the diode test mode - I’ll use the ohm mode, it wouldn’t be zero anyway - should be from 1 - to about 6 ohms in the forward biased direction - damn near open in the reverse bias condition.
I’d go back to the dist but we got this during a transistion phase and it never got logged (S/N) as to which dist we got it from…kinda hard to turn it in when you don’t know which one of 4 dists you got it from…I’ll keep in mind though.
Love your disclaimer… 
Thanks again!
Thom
There is no diode.
They replaced the diode with a fuse. (durring MFG)
The board is still marked as “D20” but there is a fuse installed instead.
I belive it was a “GP” diode used to ensure current flow in only one dirrection.. (OPE / Power jack isolation)
The issue is just that the fuse opens and “no workies..”
Replace the fuse with a 0 ohm resister (or a pice of wire) or simply jumper over the blown fuse and all is well..
Have a good one !!
Craig
Thanks Craig - all this time I was thinking it was a diode and the the fuse was the mistake…
Thom