This is what IBM AIX S/W support had me do to remove hdisk3 from homevg:

lsvg -p homevg
lsvg -l homevg
lquerypv -h /dev/hdisk3 80 10        <-- this will give the same info as reported by the lspv command
-- no info was reported, so that shows that the ODM is "out of sync"
lquerypv -h /dev/hdisk3              <-- no output
lquerypv -h /dev/hdisk1 80 10        <-- ran this to verify output was correct for hdisk1 (which is OK)
lquerypv -h /dev/hdisk1              <-- gives complete dump. look down at address 0080 and you'll see same as above "80 10" output
lsvg -M homevg                       <-- shows all hdisks associated with homevg
lsvg -M homevg|grep hdisk3           <-- look to see what is referring hdisk3
unmirrorvg -c 1 homevg hdisk1        <-- this failed, so have to individually break mirror on each lv independently.
lsvg -l homevg                       <-- to show ratios again
rmlvcopy lvbdslib 1 hdisk3           <-- picked smallest and least volatile
lsvg -l homevg|grep lvbdslib        <-- look for ratio between LP's and PP's. If not mirrored PV should show 1 and LV STATE s/b open/syncd
rmlvcopy lvatimmback 1 hdisk3       <-- run this command for all lv's associated with homevg (based on the "lsvg -l homevg" output from above
rmlvcopy lvlogfiles 1 hdisk3
rmlvcopy lvcashlogs 1 hdisk3
rmlvcopy lvhauler 1 hdisk3
rmlvcopy lvlocal 1 hdisk3
rmlvcopy lvmim 1 hdisk3
rmlvcopy lvatimm 1 hdisk3
rmlvcopy loglv00 1 hdisk3
rmlvcopy lvinformix 1 hdisk3
lsvg -l homevg                      <-- should only see 1 to 1 ratio and PVs of 1 with PV STATE at "open/syncd"
lsvg -M homevg                      <-- should only show hdisk1 refs
lsvg -M homevg|grep -v hdisk1       <-- except is 1 line stating "hdisk3:1-542" which just shows it being assigned to homevg
reducevg homevg hdisk3              <-- to remove hdisk3 from homevg
lsvg -p homevg                      <-- should show only 1 hdisk
rmdev -dl hdisk3                    <-- totally remove hdisk3 from system
lsdev -Cc disk                      <-- verify no hdisk3
synclvodm -Pv homevg          <-- this is to "sync up" the odm refs for homevg
lspv                                <-- validate no ref to hdisk3
cfgmgr -v                           <-- this "should" refind the hdisk.
lsdev -Cc disk                      <-- NO HDISK3!!! This means a hardware error at this point.

At this point I need to call IBM hardware since the system can not find either disk in scsi0.

The command you will need is ldeletepv. (on 4.3.3. 5.X made it 'easier'.)

http://www.faqs.org/faqs/aix-faq/part1/section-41.html for some hints. Partial quote below.

There is another command I have to look for which will list all the pvid of all the disks in a vg. Maybe someone else finds that command first.

I have to think a bit on this. 4.3.3 is a while back, and I need to focus on what *MISSING* actually means again.

In SMS can you see all 4 disks? verify SCSI termination, and if they are two seperate vg, try focusing on rootvg first, with each disk on a seperate adapter (SCSI chain) so that you can be very certain that there is no SCSI address error (as my memory comes back to me, double SCSI address was the most frequent "cause" of missing, if the disk controller wasnt burned itself).