Take care when remove ics (Saved a VDP)

About original Memotech hardware.
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Crazyboss
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Take care when remove ics (Saved a VDP)

Post by Crazyboss »

Hi.

Just want to remind, take care when you remove socked chips from the MTX mainboard, those chips may not have been out for many years, and kind of stuck there. Today I ran into a problem, and I wanted to swap the VDP, suddenly I discovered on of the pin was broken, it was left in the Socket.

When the chip is removed from the socket it do help to spay with some contact cleaner.

I saved the VDP by soldering a new PIN to it......
VDP out of the socket, the chip can be very hard to get out, take care!!!
VDP out of the socket, the chip can be very hard to get out, take care!!!
mtxvdp1.jpg (219.38 KiB) Viewed 6273 times
Pin 7 broke, was still in the socket, now removed!
Pin 7 broke, was still in the socket, now removed!
mtxvdp2.jpg (48.27 KiB) Viewed 6273 times
An old PC Mainboard Eprom, from my trashbin had to donate a "LEG" to the VDP.
An old PC Mainboard Eprom, from my trashbin had to donate a "LEG" to the VDP.
mtxvdp4.jpg (69.74 KiB) Viewed 6273 times
The chip is ready to get the new PIN soldered.
The chip is ready to get the new PIN soldered.
mtxvdp6.jpg (129.12 KiB) Viewed 6273 times
The PIN have now been soldered to the chip.
The PIN have now been soldered to the chip.
mtxvdp5.jpg (131.66 KiB) Viewed 6273 times
Back in the socket, ready to test.
Back in the socket, ready to test.
mtxvdp7.jpg (98.59 KiB) Viewed 6273 times
Windows users hate blue screens, but I am happy to see this blue screen.
Windows users hate blue screens, but I am happy to see this blue screen.
mtxvdp8.jpg (60.44 KiB) Viewed 6273 times
Also testing a bit by playing a game.
Also testing a bit by playing a game.
mtxvdp9.jpg (98.4 KiB) Viewed 6273 times
My contact spray, it make good contact in the socket, and make the chip a bit easyer to get out next time.
My contact spray, it make good contact in the socket, and make the chip a bit easyer to get out next time.
mtxvdp3.jpg (94.88 KiB) Viewed 6273 times
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Martin A
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Re: Take care when remove ics (Saved a VDP)

Post by Martin A »

Seeing all that crud on the pins, I'm surprised it came out at all. Well done!!
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Crazyboss
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Re: Take care when remove ics (Saved a VDP)

Post by Crazyboss »

Dave did you fix that Memotech ? :lol:
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Lardo Boffin
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Joined: 04 Apr 2021 19:54

Re: Take care when remove ics (Saved a VDP)

Post by Lardo Boffin »

Wow. I’ve pulled quite a few socketed chips over the years and never broken a pin so it never even crossed my mind it was a risk! Thanks for the warning.
MTX512 and REMEMOrizer (and a bunch of ZX81 add ons).
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1024MAK
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Re: Take care when remove ics (Saved a VDP)

Post by 1024MAK »

Unfortunately the metal used for the pins on some chips corrodes and weakens over time. Obviously this only becomes a problem if the unit is stored in less favourable conditions.

Mark
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