Reply 1 of 4, by Deksor
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- l33t
I guess the chip has a RF shield connected to ground. Also the cap near the CPU socket is dead
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Reply 2 of 4, by retardware
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- Oldbie
Multilayer boards often have ground layers for shielding.
I'd make sure that there are no shorts between layers and leads (scalpel and magnifier, drop of oil to make FR4 fiber transparent).
Sometimes it still works even though it looks bad.
But when testing, test only with the most necessary stuff installed, as such damages can blow out a whole system irreversibly if they short "the right things".
Reply 3 of 4, by rasz_pl
its pcchips, it doesnt deserve to live
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module for AT&T Globalyst
https://github.com/raszpl/386RC-16 memory board
https://github.com/raszpl/440BX Reference Design adapted to Kicad
https://github.com/raszpl/Zenith_ZBIOS MFM-300 Monitor
Reply 4 of 4, by .legaCy
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- Oldbie
wrote:I guess the chip has a RF shield connected to ground. Also the cap near the CPU socket is dead
Yup there is a lot of capacitors that need replacement on this board,i plan to recap, but i'm checking for other major issues, like these holes.