Electronics > Repair
DSO-X 3024A Power Supply defect
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rernexy:
Is the PCB blackened/burnt under the 22K resistors on the bottom of the PCB aswell (like others in this thread)?
Leo Bodnar:
It has discolouration and solder resist cracks.
Aren't these HV safety bleed resistors?  They can probably be increased in value in such case - but fixing it is polishing a turd.
It was probably designed and tested in 120V mains zone.
Leo

--- Quote from: rernexy on February 01, 2021, 11:57:31 am ---Is the PCB blackened/burnt under the 22K resistors on the bottom of the PCB aswell (like others in this thread)?

--- End quote ---
2N3055:

--- Quote from: Leo Bodnar on January 31, 2021, 10:56:07 am ---Looks like synchronous rectification MOSFET.
It's 7-8 years old - obsolete by iPhone standards.
Leo

--- Quote from: rernexy on January 31, 2021, 04:20:54 am ---Do you have any photos of what specifically blew up?
How old was your 3024A?

--- End quote ---

--- End quote ---

That must have been quite noticeable bang...
Is that a blob of ejected melted transistor metal on that mounting clamp ?

Stay safe,

Sinisa
Leo Bodnar:
Yes, it's a lava bomb ejected from inside the FET.  The explosion was very loud indeed.
Leo

--- Quote from: 2N3055 on February 01, 2021, 12:47:58 pm ---That must have been quite noticeable bang...
Is that a blob of ejected melted transistor metal on that mounting clamp ?

--- End quote ---
gman76:
Can you provide specifics on the harness re-wiring?  Is it just a matter of a couple wires?  Will it be obvious once I have the supply in hand?  I plan to use either the PQC250-12 or EPP-300-12.  Haven't purchased yet.
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