Bought a new Jeantech JN450W-120F-AP PSU because the fan on my old 350W is
starting to get noisy.
This PSU has a 24 pin ATX connector whilst the m/b has only a 20 pin
connector.
The PSU manual says it is AMD compatible and that the extra 4 pins aren't
used on a 20 pin ATX m/b.
Problem is that the connector won't push fully home at one side, the side
with the "extra" 4 pins and the PC won't boot at all. If I wiggle the ATX
connector the PSU fan will start and the green LED on m/b will come on but
nothing else.
Have checked for bent pins or any sort of obstruction but can't see anything
obvious.
PC is working OK with the old PSU back in.
Has anyone else had problems with this type of PSU?
Should I just return it to PC World and demand a refund?
This is the ATX 2.01 version JN450W-120F-AP you got, with 24 pin:
3.3V 30.0A
+5V 28.0A
+12V1 14.0A <--- 12V is split into one supply for the
+12V2 15.0A <--- processor, and the other for all other +12 needs.
-12V 1.0A (A7N8X uses hardly any +12V at all, so this
+5VSB 2.5A is kinda wasted for your current application.)
Their previous product JN120F-450-AP has a 20 pin connector:
3.3V 30.0A
+5V 45.0A <--- Plenty of +5V, useful for an A7N8X board.
+12V 22.0A
-5V 0.5A <--- This one include -5V, which (almost) no modern
-12V 1.0A motherboards are using.
+5VSB 2.5A
On an Asus S462 Athlon motherboard, most power the CPU with +5V.
(The boards do not use that 2x2 ATX12V connector which is used on
P4 Intel boards.) I recommend a 5V rating of 25A, which both
supplies meet, but the old supply has much more spare capacity.
Your options are, return the 24 pin supply and get a 20 pin supply.
Or buy an adapter cable, to convert 24 pin to 20 pin. What that
cable does, is just wire everything straight through, but it
drops the four wires and pins on one end.
What you miss, by using an adapter cable, is the feedback wire(s)
no longer terminate close to the motherboard, so any small amount
of voltage drop in the adapter cable is not compensated for.
One problem with plugging a 24 pin into a 20 pin motherboard, is
the clearance of components in the near vicinity. If anything gets
in the way of the overhang, it may not fit. Also, it is important
that the lock latch engage, as that prevents the connector from
"walking" out of the motherboard. Thermal effects can cause that
to happen, and a positive retention system is good to have. If
the ATX connector works loose, the pins get hot from the bad
contact, and the heat can melt and distort the plastic on the
connector, ruining motherboard and PSU.
Here is a sample picture of a Thermaltake adapter kit. The
cable is short, which will minimize the voltage drop in the
cable, so this one should do the job for you ($7):
http://www.newegg.com/Product/Showi...ltake+PSU+Adapter+Cables+Model+A2169+-+Retail
There are also ATX 2.01/2.03 power supplies, where the 24 pin
connector comes apart in two pieces. There is a 4 pin section
and a 20 pin section. The pieces slide together when you want
a 24 pin connector, or come apart when you need just the 20 pins.
The only thing I'm not sure of here, is how well the lock latch
works for the 20 pin and 24 pin situations. Here is a tiny
picture of what such an option looks like.
http://www.enermax.com.tw/image/product_psu/cg05_s.jpg
HTH,
Paul
