GMAN wrote:
> I have a P4S333 Motherboard that was given to me and I am having troubles with
> the secondary IDE ports. The primary works great, i have both turned on in the
> bios, which is the latest beta bios date 2003. Its just that it actslike its
> non functional whenever any type of IDE device be it hard drive or CD riom or
> DVD Rom , zip drive, ape back, anything ide does not get recognisd. Is there
> some surface mount fuse or something in that are just for the secondary ide
> channel?
>
>
have you checked the BIOS, to see if they've been disabled in a BIOS setting ?
In terms of schematics, so you can see what they do for IDE, I have
a couple links.
http://www.intel.com/design/chipsets...x/BXDPDG10.PDF (440BX, PDF page 25)
http://www.intel.com/design/chipsets...ics/252812.htm (875P, PDF page 39)
Those are two different generations of chipsets. The second chipset,
integrates the series damping resistors into the Southbridge, which
is why fewer series resistors are shown.
And there is no power shown on the connector pinout here. So
no reason for a fuse leading to this connector. And powering
to the Southbridge, would likely affect both IDE ports
equally (like if the power source to the Southbridge was
bad). This list is probably enough, to get some understanding
of the interface (schematics are only for if you're more curious).
http://www.bbdsoft.com/ide.html
Have you checked the IDE connector pins on the motherboard,
for bent or broken ones ? Compare the working connector
to the non-functional connector. On ribbon cable connectors,
sometimes a pin misses the hole, and gets bent 90 degrees.
And will snap when straightened :-(
On a typical motherboard, fuses are on -
1) Combined PS/2 keyboard and mouse. One fuse feeds the stack.
2) Pairs of USB headers get a fuse.
3) Firewire port +12V output
4) Fan headers are unprotected, and the 12V track is thin enough
to conveniently burn out.
Switching regulators (Vcore) may have current limiting, while linear
regulators (the ones Asus builds with opamps), likely melt
when provoked :-)
Paul