Rexpower PL-400 rebuild

[c_hegge]

Success!

SUCCESS!

It turned out that there were two problems The first was another solder blob shorting the 12v rail. The second was an incompatible transformer. I replaced it with another 35 size from another dead PSU. Put it on the tester and it fired right up. The 12v was a little high at 12.6, probably due to not having much load, but all the other rails looked fine.

[shovenose]

Re: Rexpower PL-400 rebuild

cool. how did u make the big text are you gonna make a new label for the psu reflecting its awesomeness? like SUCCESSPOWER 700w PSU?

[goodpsusearch]

Re: Rexpower PL-400 rebuild

Congratulations! Well done!

I have never replaced transformer or switching transistors in a power supply.. Maybe one day I will find the courage and try it.

[c_hegge]

Re: Rexpower PL-400 rebuild

cool. how did u make the big text are you gonna make a new label for the psu reflecting its awesomeness? like SUCCESSPOWER 700w PSU?

Here is how you change the text size. I'll just stick with my "C H PC Power MOD-400" Label

[shovenose]

Re: Rexpower PL-400 rebuild

More official-looking model number, maybe rpm400atx (rexpower modded 400w atx)Not to be confused with diablotek rpm series

[Th3_uN1Qu3]

Re: Rexpower PL-400 rebuild

That 12v rail is going to be fine if you use the power supply in a Pentium 4 or anything newer than that. Just don't try it on an AXP.

[c_hegge]

Re: Rexpower PL-400 rebuild

That 12v rail is going to be fine if you use the power supply in a Pentium 4 or anything newer than that. Just don't try it on an AXP.

Oh, What? That's why I beefed up the 5v rail so much, so it could handle systems that use it for CPU power. Oh well...

[Th3_uN1Qu3]

Re: Rexpower PL-400 rebuild

If it's already at 12.6 while the other rails are reading normal, think of what would happen when you load up the 5v rail only. Most parts will handle up to 15 volts, but don't trust ALL of them to be able to do so.

[c_hegge]

Re: Rexpower PL-400 rebuild

I did another run on the tester, and what I failed to notice last time is that, although this is a single rail PSU, the tester shows 12.3v on 12v1 and the 12.6v is on 12v2, so I'm begining to think it might be the 12v2 meter in the tester. The 5 and 3.3v rails showed 5.1 and 3.3v respectively.

[Th3_uN1Qu3]

Re: Rexpower PL-400 rebuild

At 12.3 it's well in spec. Drop it into a spare computer and see how it does. Use a regular multimeter to read the rails.

[c_hegge]

Re: Rexpower PL-400 rebuild

Unfortunately, I don't have a spare PC. That's why I'm building a load tester.

[goodpsusearch]

Re: Rexpower PL-400 rebuild

If you lived in Greece I would give you old p4 PCs and psus with bad caps to play with.

There are PLENTY of them here!

[c_hegge]

Re: Rexpower PL-400 rebuild

After all that it's still only 200W! If I attempt to pull any more than 10A from the 5 and 3.3v rails and 5A from the 12v, the OPP shuts it off!

[kiddznet]

Re: Rexpower PL-400 rebuild

Congratulations. It seems I have the very same power supply. it succumbed to a dead short in a HDD and will now only give five volts. Poking my MM in the CEF02NG transistor doesn't show any life. Could it be as simple as replacing that?

[370forlife]

Re: Rexpower PL-400 rebuild

After all that it's still only 200W! If I attempt to pull any more than 10A from the 5 and 3.3v rails and 5A from the 12v, the OPP shuts it off!

Try going a bit lighter on the 5v/3.3v and heavier on the 12v.

[kiddznet]

Re: Rexpower PL-400 rebuild



KAAA...BLOOEY!

Could it be as simple as replacing that?

Nope

[Th3_uN1Qu3]

Re: Rexpower PL-400 rebuild

After all that it's still only 200W! If I attempt to pull any more than 10A from the 5 and 3.3v rails and 5A from the 12v, the OPP shuts it off!

Then trace the OPP line and reconfigure it. It uses a SG6105, doesn't it?

[goodpsusearch]

Re: Rexpower PL-400 rebuild

Are you sure it is the OPP that is shutting it down and not something else?

For example, check all the voltages seconds before it stops working. It might be UVP/OVP.

[370forlife]

Re: Rexpower PL-400 rebuild

Are you sure it is the OPP that is shutting it down and not something else?

For example, check all the voltages seconds before it stops working. It might be UVP/OVP.

Thats what I was thinking, maybe he was crossloading it by putting too high of a load on the 5v/3.3v and not enough on the 12v.

[Th3_uN1Qu3]

Re: Rexpower PL-400 rebuild

No chance it's UVP/OVP, they are set to such obscene values that they basically don't exist.