MY PROBLEM :
After unsoldered my NVRAM and installed a IC socket , the "A SWP TRIG D" led begin to flash and all stop
After consulting the troubleshooting diagram and associated tables (thanks MED6753) I found that nothing was to retire of them
FIXING :
following the advice of ALFONS , I tested the socket, pin by pin by lightly scratching the tracks next to them, and BINGO I discovery a track break ... only one out of 28 .. the tracks are so thin and fragile
After fixing, my 2465B is working again but I have error 04 fail 11
Normal, I had lost my calibration datas yesterday during the NVRAM unsoldered operation ... I don't always know why?