After messing a little bit, I have finally repaired my VP800 desoldering station,
https://www.eevblog.com/forum/repair/need-help-for-fixing-a-weller-vp800-desoldering-station/and started to use it.
It is perfect for boards when the holes are large enough to provide ample space for
the solder to flow ( and this was the case in Dave's review
http://www.eevblog.com/2013/11/01/eevblog-542-zd985-desoldering-station/),
but things get much more complicated with multilayer boards with holes that are barely the size of the pins.
In this case, at least for my minimal experience, I found that there was a very narrow path between
desoldering the chip and ruining the board by lifting the pads.
I tried to add some flux which seem to help, but still there is some place for improvement.
I would like to ask you all if you have special Tips or Tricks to share for improving thes desoldering technics,
with the aim of repairing the item, so not to ruin the board ?
If I just want to salvage components, I may just go back to the heat gun technique, heating on the back, which
is very crude but very effective.
PS : I took the opportunity of upgrading to "regular contributor" to add an avatar to my profile. Hope you will like it.