Metal working – Method of mechanical manufacture – Electrical device making
Patent
1999-10-28
2000-09-12
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
2940207, 2940208, 29837, 29841, 29843, 29847, 174267, 22818021, 22818022, 228264, H05K 334
Patent
active
061159123
ABSTRACT:
A method and apparatus for efficiently repairing or reworking a printed circuit board having a solder ball grid array thereon efficiently and at minimum cost includes the steps of drilling out a plated-through hole to sever electrical connections between a ball grid array pad on one surface of the printed circuit board and internal circuits and circuits on an opposite surface of the printed circuit board; inserting a pin having an insulated sleeve surrounding a portion thereof into the drilled-out hole, the pin having attached to one end a wire for attachment to the ball grid array on one surface of the printed circuit board and a post at the other end of the pin for attachment of a wire to the post; the pin having a stop along its length to control vertical positioning of the pin in the drilled-out hole, the pin referred to as a via replacement (VR) pin. Alternately, after the plated through hole is drilled out, an insulated wire may be inserted into the hole with insulation removed from the length of the wire which extends beyond one surface of the printed circuit board. The bare length of wire is bent parallel to the surface of the printed circuit board and attached thereto by a solder reflow process. In a dog bone configuration, the wire is formed around a pad on the surface of the printed circuit board which receives the solder ball.
REFERENCES:
patent: 3859711 (1975-01-01), McKiddy
patent: 4170819 (1979-10-01), Peter et al.
patent: 4371744 (1983-02-01), Badet et al.
patent: 4799128 (1989-01-01), Chen
Circuits Assembly Feb. 1995, pp. 60-64 by E. Zamborsky.
Crudo Alan Harris
Davis John Gillette
Le Coz Christian Robert
Pierson Mark Vincent
Sarkhel Amit Kumar
Arbes Carl J.
Fraley, Esq. Lawrence R.
International Business Machines - Corporation
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