North Hedge Ned
Well-known member
So, I got around to troubleshooting the one of my two LC protos that powers on, but only gives a strange video on screen. The battery had blown up on the board, and fried one of the ROM chips - at least the pins are affected! Figures - one of the 4 pictured below - can you tell which one? The dirtiest, 3rd from the left. So, I pulled the ROM chip - carefully, and 1 pins remained in the socket, and 2 simply fell off. They were corroded. I have thoroughly cleaned the board, dried it well with air, and had a thought. Before the though,... the report: one pin is half there, one pin still has a bit of metal coming out of the chip, and the third is almost flush to the ceramic. I have prepared (almost) the pin that is flush by carefully grinding the top down to expose more metal.
My question is this: I want to somehow reconnect this to the socket. Do I have these options?
1) solder on fine wire (like 20 or 22 gauge) to the missing pins on the chip, and wire-wrap around to the corresponding socket pins underneath the board? or,
2) use single strand copper wire (rigid) to solder on new make-shift pins to the chip and put the chip down into the socket as far as possible, or
3) a combo of both where new pins can go into the socket and wire-wrap on those that have a pin stuck inside
For the pins in option 2 or 3, can I use paperclip or do I have to source out single copper wire?
In wire-wrapping a chip to the underside of the socket pins, as in option 1 or 3, is there some set of rules to be aware of in regards to resistance and distance? Gotta think that if wire wrapped, the ROM would have 3 connections that would be far, far longer than the rest of the chip to the board.
Thanks in advance.
My question is this: I want to somehow reconnect this to the socket. Do I have these options?
1) solder on fine wire (like 20 or 22 gauge) to the missing pins on the chip, and wire-wrap around to the corresponding socket pins underneath the board? or,
2) use single strand copper wire (rigid) to solder on new make-shift pins to the chip and put the chip down into the socket as far as possible, or
3) a combo of both where new pins can go into the socket and wire-wrap on those that have a pin stuck inside
For the pins in option 2 or 3, can I use paperclip or do I have to source out single copper wire?
In wire-wrapping a chip to the underside of the socket pins, as in option 1 or 3, is there some set of rules to be aware of in regards to resistance and distance? Gotta think that if wire wrapped, the ROM would have 3 connections that would be far, far longer than the rest of the chip to the board.
Thanks in advance.