u/djflex81

Hi,

I am having real issues trying to desolder the bios chip on this model 1 sega mega cd pcb.... No matter what i try I cant get some of the holes to clear and are super stubborn... especially this last middle pin no matter what I try! I know this board has a thick ground plane but wow.

My desoldering iron is set to 480c, ive tried loads of flux, fresh leaded solder, desolder wick, using hot air etc its just sucking up all the heat and doesnt melt and wont clear.. and its now making me quite frustrated and angry!

How in the hell can I shift this bastard? I dont know how the board isnt actually taking more damage.

Do I need to upgrade my desoldering station?

Oh soldering gods help me!

https://preview.redd.it/v7ij1irmnabh1.png?width=953&format=png&auto=webp&s=f988e60156c688fdc5dffd5e7168ce3bcb360768

https://preview.redd.it/p4n171snnabh1.png?width=953&format=png&auto=webp&s=3a42ae9cbf78d442d8ee323fd868086765ba74e6

Hi! I am after some advice on how to diagnose what’s going on with this Amiga A500 (I think it’s a rev 3). It was previously just booting to a plain white screen but occasionally it boots to a garbled image of the kick start floppy image as can be seen in the video. When it was in the case it would show a solid red power LED and you can hear the floppy drive trying to access even though there is no disk in the drive like a small clicking sound (is this normal?).

I do a lot of console mods / repairs but don’t really have any Amiga experience. I’ve already tried reseating all of the socketed chips and done a visual inspection of the board and I see nothing obvious and it’s generally in good condition just the usual 35+ years worth of dust bunnies in there.

I don’t have another Amiga to start pulling swapping chips from so was wondering if this is a common fault ?

Any advice greatly appreciated.

Thanks

Desoldering Sega Mega CD BIOS chip... impossible with the ground plane!!!