More actions
| Mean Well RSP-2000-48 Not turning on at all repair | |
|---|---|
| Device | Mean Well RSP-2000-48 |
| Affects part(s) | Fuse, MOSFETs. |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering, Part replacement |
Problem description
Fixing a Mean Well power supply that doesn't react to power at all when plugged in. This particular issue is rather common and is cased by a faulty fuse that connects the out of the PFC (power factor correction) to the bulk DC capacitors. Mostly, this fuse is blown by heat or a spike in load where upon replacing it the PSU works fine afterwards. Other cases have the switching MOSFETs become shorted Which blows the fuse.
Symptoms
- Not turning on
- Not reacting to power
Solution
Diagnostic Steps
- Open up the device and take out the pcb.
- Measure the fuse on figure 1, if it's blown open the continue with the guide, otherwise, you have a different problem!
- Measure the bulk caps if there's a short, if there is, you'll need to find out which component is causing it.
- Since all the MOSFETs are placed on a heatsink, it'll be hard to detect which is shorted with voltage injection, what I did was cut the legs and measure again, if it's not the cause of the short I solder the legs back.
- Once you've identified the short, proceed to the repair steps
Repair Steps
- If you had no short on the bulk caps, replace the fuse and test. It should work afterwards. If it doesn't and blows again even without a short that means the driving for the MOSFETs is faulty.
- If you had a short and successfully identified which is causing it, replace that component and the fuse.