Crs-atx 250 T.c (250w)

[JEWilson]

This appears to be working and came out of a Medion PC with an MD5000 mobo.
The T.C states it is thermally controlled - haha!
I have changed the PSU in this box and intend to sell this one
as a Medion spare to any buyers.

I use two PSU testers for go/no go.
The most recent has the LCD readout. Whereas this PSU reports all
ok with the first tester, the second, beeps but reports all the voltages
as being present.

Rail O/P as found on PSU label
+12.0V : 13.0 A max.
+ 5.0V : 25.0 A max.
+ 3.3V : 14.0 A max.
- 5.0V : 0.5 A max.
-12.0V : 0.5 A max.
+ 5.0V SB : 1.5 A max.

As the ATX specification details
+12.0V : +/- 5 % readings between 11.40 to 12.6
+ 5.0V : +/- 5 % readings between 4.75 to 5.25
+ 3.3V : +/- 5 % readings between 4.75 to 5.25
- 5.0V : +/- 10 % readings between 4.5 to 5.5
-12.0V : +/- 10 % readings between 10.8 to 13.2
+ 5.0V SB : +/- 5 % readings between 4.75 to 5.25

Tester 2 readouts;
+12.0V : 11.7 V ok
+ 5.0V : 5.3 V out of regulation
+ 3.3V : 3.3 V ok
- 5.0V : Unknown
-12.0V : 11.6 V ok
+ 5.0V SB : 5.2 V ok
PG : 240 mS

Seems the +5V rail at 5.3 is out of regulation and the tester beeps.
I opened up the PSU and find in the O/P filter

1 of Black 1650 uF 16 V Fuhjyyu TNR 105 deg C - H 25.4 mm x Dia 10 mm is +12V rail (yel),
2 of Blue/Purple 1000 uF 10 V Fuhjyyu TNR 105 deg C - H 20.0 mm x Dia 10 mm is +5V rail (red) ,
1 of Black 220 uF 10 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 5.0 mm is +3.3V rail (ora), C38
1 of Black 220 uF 16 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 7.5 mm is -12V rail (blu), c34
1 of Black 220 uF 16 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 7.5 mm is -5V rail (whi),
2 of Black 470 uF 16 V Fuhjyyu TNR 105 deg C - H 15.0 mm x Dia 7.5 mm is +5VSB rail (vio), c32 and?

These are all bad caps.

Note the can for +3.3V and current O/P - must be a mistake surely?
Bad quality control at production?
Seems to me should be 6.3V, 1800 uF or so to meet amps O/P at 14.0A relative to PSU O/P claims, not as it is 220uF 10V?

Would this be indicative of bad regulation reading on +5V rail?

Next, tested the ESR and establish if any caps s/c to gnd

1 of Black 1650 uF 16 V Fuhjyyu TNR 105 deg C - H 25.4 mm x Dia 10 mm is +12V rail (yel), ESR 0.06, goes high Z
2 of Blue/Purple 1000 uF 10 V Fuhjyyu TNR 105 deg C - H 20.0 mm x Dia 10 mm is +5V rail (red), ESR 0.05, goes high Z
1 of Black 220 uF 10 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 5.0 mm is +3.3V rail (ora), C38, ESR 0.28, stays s/c
1 of Black 220 uF 16 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 7.5 mm is -12V rail (blu), c34, ESR 0.22, goes high Z
1 of Black 220 uF 16 V Fuhjyyu TNR 105 deg C - H 10.0 mm x Dia 7.5 mm is -5V rail (whi), ESR 0.26, goes high Z
2 of Black 470 uF 16 V Fuhjyyu TNR 105 deg C - H 15.0 mm x Dia 7.5 mm is +5VSB rail (vio), c32 and?, ESR 013-0.15, stays s/c

Am I missing something here?

Any insight, advice and help appreaciated

[yanz]

Re: Crs-atx 250 T.c (250w)

Note the can for +3.3V and current O/P - must be a mistake surely?
Bad quality control at production?
Seems to me should be 6.3V, 1800 uF or so to meet amps O/P at 14.0A relative to PSU O/P claims, not as it is 220uF 10V?

You sure you check them correctly? 220uF of capacitance for 3.3v is a joke. At least there should be 1000uF one(s) there at the pi filter...

Would like to see the pics if you have some...

[Super Nade]

Re: Crs-atx 250 T.c (250w)

I think he means 2200uF not 220.

[Sparky]

Re: Crs-atx 250 T.c (250w)

Fuhjyyu [...]
Fuhjyyu [...]
Fuhjyyu [...]
Fuhjyyu [...]
Fuhjyyu [...]
.......

[JEWilson]

Re: Crs-atx 250 T.c (250w)

Seriously guys....

220uF 10v on the 3.3V rail!

Sorry, I do have a hi-res pic to prove it and
I have repaced it with a salvaged but in vgc Panasonic FL 6.3V 1800uF

Problem with +5V rail regulation is still present!

BTW regulation for 3.3v rail should read;
+ 3.3V : +/- 5 % readings between 3.135 to 3.465

Must be a short somewhere on 3.3V rail as well as short on the +5VSB
as these reading remain the same even after replacing the cap above.

Any suggestions?

[JEWilson]

Re: Crs-atx 250 T.c (250w)

It appears severach has made a point, these go/no-go testers
do not outline PSU problems when Power Good shows less than 270ms.

per https://www.badcaps.net/forum/showthread.php?t=4461

As I did not power up the PC and mobo that came with this PSU
in its original configuration (as was), I find it unlikley, it would have had enough
current delivery given the problem cap, to power the mobo effectively.

Of course, the genesis of the PG and 5V rail problem may have been
as a result of this as may be indicative of the s/c's.

Perhaps that is why I acquired this lot! I'll need to find this short.

[JEWilson]

Re: Crs-atx 250 T.c (250w)

I tried putting a HDD on this PSU as a load.

So far as the go/no-go tester formerly beeped with no load
and I surmised the +5V rail out of regulation caused this,
with one and up to three HDDs as load removes the beep alarm
but the +5V rail remains at 5.3V.

Seems I was premature stating a s/c exists, my mmeter was
set on continuity and gave me the incorrect indication - sorry..

So..

Am I looking at a duty cycle issue with this PSU so far as it
requires a load to behave correctly? Furthermore, this PSU
probably has no o/v protection being as it is very cheap - could
be a red herring...

I need a scope - that would help

[Big Pope]

Re: Crs-atx 250 T.c (250w)

Fuhjyyu now changed with another brand name called "Asia'X", be care any PSUs with "Asia'X" caps.

[gonzo0815]

Re: Crs-atx 250 T.c (250w)

Most PSU`s need a minimum load for good regulation. Cheap ones may be burn if powered up w/o load.

This is normal behavior, expensive PSU`s circumvent this problem by providing a minimum load via a few power resistors.
I think 5.3v is not that big issue, i would try it out with a real load. It should be safe to doe this, at least considering the 5.3v o/p.

[kc8adu]

Re: Crs-atx 250 T.c (250w)

sounds more like this thing deserves some bullet holes more than new caps.
pics?
might save you the time of fixing something worthless or even dangerous.
crs=cant run shit?

[starfury1]

Re: Crs-atx 250 T.c (250w)

Does that mean KC8 to use the "ultimate fix it good tool"

Guaranteed to "never" work again

[JEWilson]

Re: Crs-atx 250 T.c (250w)

Hi

So far as I expressed doubts with the +5V rail reading on this
PSU - and forum members expressed sentiments of do not pass
go - go staight oto PSu hell! I tried the same HDD load as with

https://www.badcaps.net/forum/showpo...57&postcount=5

The voltage in this CRS PSU has come down to 5.2V at least,
that is, on the LCD readout of the go/no-go tester. But
PG remains low at 250ms.

I have seen comment expressed PG below 270ms is a problem
that requires component level diagnosis.

Would this be the view endorsed by forum members?

I acknowledge the sentiments of forum members in the
specific matter of this PSU, very bad as it is but am looking to
sound out the observations of members re - fast and/or
timing issues found in ATX PSU.