Electronics > Repair
Siglent Oscilloscope SDS2104X repair help
Gaktyt:
Hi.
I unfortunately blew one channel on my scope with a bit of overvoltage, and now the trace doesn't appear at all. So where do I start?
Does anyone have any experience with Siglent scope repair? Does anyone have any schematic? Does anyone know if the front-end is repairable or is it all just one big custom chip?
Siglent quoted me €700 for the "repair" (which turns out is just a main-board replacement), and I have about €100 in shipping cost - which lands me just shy of €200 for a completely new scope including shipping. Unfortunately I can't afford the repair nor a new scope at the moment, so I really need to figure out a way of repairing it.
Your help is much appreciated.
Gaktyt
tautech:
Welcome to the forum.
Dave's teardown shows the front end clearly so if you have other working channels it shouldn't be too hard to follow the signal path until you find the fault.
https://www.eevblog.com/2016/03/31/eevblog-864-siglent-sds2000x-series-oscilloscope-teardown/
Gaktyt:
Great, thank you for the link.
Yes I have three working channels left :-) , so let me have a try.
tautech:
You might also find this video Dave did on the front end of the later 4c X-E Siglent scope.
https://www.eevblog.com/2019/07/10/eevblog-1228-do-digital-scopes-have-real-verniers/
It may not give you much more than a better understanding the function of some of the IC's in the front end signal path.
I'm sure if you write up your findings and methods used it can also help others too that blow a channel.
Good luck with your fix. :)
Gaktyt:
Thank you. Great idea, I will try to write something up.
Would this be a sensible approach? I crack the scope open, power it up, put a signal on ch 4 (the blown one) and e.g. ch 2, then follow the signal on both channels with my spare scope, and when ch 4 does not match ch 2 I would have found the first defect component?
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