Omax fried LED driver PCB -Solved!
Posted: Wed Dec 01, 2021 3:46 pm
I, like many other proud owners of Omax LED microscopes, fried my LED PCB -and more by plugging in a wrong voltage but plug-compatible wall-wart.
Many OMAX scopes including my nice M837ZL series scope have a proprietary board DXL80D which is easily damaged by over-voltage. Like others owners I was unable to find a replacement part, and anyway it seemed poor engineering to be so fragile -not even a simple fuse to guard the light source.
The scope is repaired now and is fused, fully functional and tolerant of any correct polarity input voltage 5-35v, so if you pick up the wrong power adapter or can't find the original, all's well; just plug it in and use the scope. (Hard to know why it wasn't made like this in the first place?)
I posted the details of the repair at https://www.eevblog.com/forum/repair/he ... msg3846572 , as it is about a repair rather than using a microscope. But if the microscope is broken, you can't use it!
The parts are referenced on Amazon for convenience, but I have no recommendation on sources. The 'scope is now fully functional and repairable with "off the shelf" readily available inexpensive parts. Skills needed? Simple soldering and use of a digital multimeter. If the posted repair details aren't entirely clear, please feel free to contact me.
That's it! An "unreparable" nice Omax better than new for the price of a haircut!
Many OMAX scopes including my nice M837ZL series scope have a proprietary board DXL80D which is easily damaged by over-voltage. Like others owners I was unable to find a replacement part, and anyway it seemed poor engineering to be so fragile -not even a simple fuse to guard the light source.
The scope is repaired now and is fused, fully functional and tolerant of any correct polarity input voltage 5-35v, so if you pick up the wrong power adapter or can't find the original, all's well; just plug it in and use the scope. (Hard to know why it wasn't made like this in the first place?)
I posted the details of the repair at https://www.eevblog.com/forum/repair/he ... msg3846572 , as it is about a repair rather than using a microscope. But if the microscope is broken, you can't use it!
The parts are referenced on Amazon for convenience, but I have no recommendation on sources. The 'scope is now fully functional and repairable with "off the shelf" readily available inexpensive parts. Skills needed? Simple soldering and use of a digital multimeter. If the posted repair details aren't entirely clear, please feel free to contact me.
That's it! An "unreparable" nice Omax better than new for the price of a haircut!