| Electronics > Repair |
| DSO-X 3024A Power Supply defect |
| << < (10/16) > >> |
| 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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