Electronics > Repair

ultrasonic cleaner MH-060S, replacing transistors [fixed > broken again]

<< < (8/8)

floobydust:
Check your model is likely the same as a Vevor, for repair and safety issues as well. I also mentioned it here:
https://www.eevblog.com/forum/repair/vevor-30l-ultrasonic-cleaner-went-up-in-smoke-take-tranducer-out-of-series/msg5605060/#new

wraper:
As this has single layer PCBs I suggest thoroughly inspecting with magnification if there isn't some cracked solder joint. Sometimes it may be even not a crack as such but component lead not properly wetted by solder and moving within the joint that may look fine on a first glance.

fzabkar:

--- Quote from: wraper on August 14, 2024, 10:05:10 pm ---As this has single layer PCBs I suggest thoroughly inspecting with magnification if there isn't some cracked solder joint. Sometimes it may be even not a crack as such but component lead not properly wetted by solder and moving within the joint that may look fine on a first glance.

--- End quote ---

This is the reason that I was taught to always reflow the solder at inductors and transformers.

wraper:

--- Quote from: fzabkar on August 15, 2024, 12:08:12 am ---
--- Quote from: wraper on August 14, 2024, 10:05:10 pm ---As this has single layer PCBs I suggest thoroughly inspecting with magnification if there isn't some cracked solder joint. Sometimes it may be even not a crack as such but component lead not properly wetted by solder and moving within the joint that may look fine on a first glance.

--- End quote ---

This is the reason that I was taught to always reflow the solder at inductors and transformers.

--- End quote ---
FBT solder joints were basically guaranteed to crack sooner or later in CRT TVs/monitors if manufacturer did not add rivets in the holes. It also amazes me how often I see single layer boards used in high vibration environment, it's just plain stupid  :palm:.

htm:
As promised, i checked the device which is broken again(picture attached).
Basically, the small board was saved by the fuse. The larger board is broken again.
Curious how both boards got damaged at the same time..

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod