US20020059721A1 - Apparatus and method for printed circuit board repair - Google Patents
Apparatus and method for printed circuit board repair Download PDFInfo
- Publication number
- US20020059721A1 US20020059721A1 US09/938,402 US93840201A US2002059721A1 US 20020059721 A1 US20020059721 A1 US 20020059721A1 US 93840201 A US93840201 A US 93840201A US 2002059721 A1 US2002059721 A1 US 2002059721A1
- Authority
- US
- United States
- Prior art keywords
- printed circuit
- circuit board
- pin
- hole
- wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3436—Leadless components having an array of bottom contacts, e.g. pad grid array or ball grid array components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/225—Correcting or repairing of printed circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09372—Pads and lands
- H05K2201/0949—Pad close to a hole, not surrounding the hole
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10287—Metal wires as connectors or conductors
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10621—Components characterised by their electrical contacts
- H05K2201/10734—Ball grid array [BGA]; Bump grid array
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10613—Details of electrical connections of non-printed components, e.g. special leads
- H05K2201/10954—Other details of electrical connections
- H05K2201/10992—Using different connection materials, e.g. different solders, for the same connection
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/04—Soldering or other types of metallurgic bonding
- H05K2203/041—Solder preforms in the shape of solder balls
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/17—Post-manufacturing processes
- H05K2203/175—Configurations of connections suitable for easy deletion, e.g. modifiable circuits or temporary conductors for electroplating; Processes for deleting connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
- H05K3/0047—Drilling of holes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/429—Plated through-holes specially for multilayer circuits, e.g. having connections to inner circuit layers
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Definitions
- the present invention relates to printed circuit boards used in electronic systems and, more particularly, to a method and apparatus for reworking or repairing printed circuit boards including solder ball grid arrays.
- the articles shows a method for reconstructing a deleted internal net of the PCB by utilizing an insulated bifurcate connector pin with an extended tail which provides pluggability with a coaxial cable.
- the article does not describe how the connector would be connected to pads in a ball grid array, and further, the physical size of the device shown in the article is much too large for use with a ball grid array pattern on a printed circuit board. In any event, the article does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 3,230,297 teaches a circuit board with a connector with solder resistant portions.
- the patent teaches a repair of a simple double-sided board rather than current multi-layer boards, and the patent does not address the problems associated with ball grid arrays as are taught and claimed herein.
- U.S. Pat. No. 3,361,869 teaches an apparatus for making connections to a printed circuit board and for circuit line repair.
- the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 3,406,246 teaches an apparatus for repair of printed circuit lines on a double-sided printed circuit board.
- the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 4,409,732 teaches a circuit isolator element for use in isolating leads while testing components on a printed circuit board.
- the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 4,778,556 teaches an apparatus for correcting or repairing printed circuit boards.
- the patent only teaches adding conductors to an existing printed circuit board.
- the patent does not teach nor suggest deletion of printed circuits nor ball grid array processing as are taught and claimed herein.
- 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.
- VR via replacement
- 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.
- the wire is formed around a pad on the surface of the printed circuit board which receives the solder ball.
- a printed circuit board may be reworked in such a fashion so as to be compatible with connection of either single wires or twisted pair or coaxial cable. Further, it is an advantage of the present invention that rework of a printed circuit board may be accomplished in a simple and inexpensive manner.
- FIG. 1 is a cross-section view of a printed circuit board prior to a repair or rework.
- FIG. 2 is a cross-section view of a plated-through hole of a printed circuit board after a drill-out operation in accordance with the present invention.
- FIG. 3A is a front cross-section view of a VR pin in accordance with a first embodiment of the present invention.
- FIG. 3B is a side cross-section view of a VR pin in accordance with a first embodiment of the present invention.
- FIG. 3C is a cross-section view of a VR pin inserted in a drilled-out hold in a printed circuit board according to a first embodiment of the present invention.
- FIG. 3D is a top view of a portion of a printed circuit board showing a configuration of the connection wire as it is formed to make secure mechanical and electrical connection with a solder ball pad in accordance with a first embodiment of the present invention.
- FIG. 4 is a cross-section view of a printed circuit board with an insulated wire inserted in the drilled-out plated-through hole in accordance with a second embodiment of the present invention.
- FIG. 5 is a top view of a printed circuit board showing the configuration of the connection wire as it is formed so as to have secure electrical and mechanical contact with a solder ball pad in accordance with a second embodiment of the present invention.
- PCB 10 includes a top printed circuit layer 12 and multiple internal printed circuit layers 13 , 14 , 15 , 16 , 17 , and 18 , as well as bottom printed circuit level 20 .
- PCB 10 also includes a number of plated-through holes 22 , 24 , and 26 which permit connections between various levels of the multiple level PCB 10 .
- Integrated circuit chip 30 is mounted to a substrate 32 by solder connections 34 .
- the substrate 32 is mounted to the top printed circuit level 12 of PCB 10 by solder ball grid array (BGA) 36 .
- BGA solder ball grid array
- FIG. 1 shows the so-called ‘dog bone design’ of solder ball connections (SBC) where the solder balls are offset from the plated-through holes in printed circuit board 10
- SBC solder ball connections
- a plated-through hole such as hole 22 is drilled out to remove the conductive material which plates the walls of hole 22 . This leaves a hole without connections between various levels of the multiple level circuit board 10 .
- a wire 60 or pin 40 within an insulating sleeve 62 , 48 is inserted in the drilled-out hole 22 in PCB 10 such that desired connections can be made between ball grid array 36 on a top surface of PCB 10 and other wires, whether single wire or coaxial cable to be connected to the post of a VR pin 40 (see FIG. 3A), or to a tail of wire 60 (see FIG. 4).
- FIGS. 3A, 3B, and 3 C a first embodiment of the present invention will be described.
- a via replacement (VR) pin 40 is shown in FIG. 3A in a front section view, in FIG. 3B in a side section view, and in FIG. 3C inserted in multi-level printed circuit board 10 in drilled-out hole (via) 22 and secured by a fluid tight, mechanically strong material, such as epoxy.
- VR pin 40 has a lower post portion 42 which extends below the bottom of PCB 10 , a tail portion 44 which extends from the post portion 42 upward through the via 22 , and a Z-stop 46 which controls the vertical positioning of the VR pin 40 within the via hole 22 .
- a wire 46 is attached to tail portion 44 by a suitable electrically conductive attachment mechanism such as welding.
- Wire 46 may typically be a small diameter (approximately three mils) gold plated wire. Wire 46 is of sufficient length to extend out of hole 22 (FIG. 3C) and be bent over and affixed to ball grid array 36 .
- An insulating sleeve 48 is placed over the wire 46 and tail 44 of VR pin 40 . The insulating sleeve 48 prevents contact between any of the intermediate printed circuit planes 13 , 14 , 15 , 16 , 17 , and 18 of PCB 10 .
- Post 42 is the rigid extension of VR pin 40 which provides sufficient strength and is of appropriate material or plating such that a connection wire (not shown) can be attached by soldering or other means of attachment.
- Wire 46 is welded to tail 44 of VR pin 40 as described above.
- An epoxy araldite material 50 provides mechanical security between sleeve 48 , tail 44 , and wire 46 and provides a liquid tight seal around wire 46 and tail 44 .
- Wire 46 which extends out of the top of hole 22 , may be bent and formed to be in electrical and mechanical contact with dog bone 52 on which a solder ball of solder ball grid array 36 is attached. (See FIG. 3D.)
- FIG. 4 shows a coaxial cable having a wire 60 surrounded by an insulator 62 with a ground lead 66
- wire 60 could also be a single conductor surrounded by an insulator 62 and not a portion of a coaxial cable.
- Wire 60 embedded in insulating material 62 is passed through via hole 22 in printed circuit board 10 , and the wire is bent into an appropriate form to match the dog bone configuration (see FIG. 5) for receiving a solder ball of solder ball grid array 36 .
- the wire and insulator is held in place and sealed with adhesive 64 which may be an epoxy material.
- adhesive 64 which may be an epoxy material.
- the ground lead 66 of the coaxial cable may be soldered to an appropriate ground connection, and the bottom of hole 22 may be sealed with epoxy material as described above.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing Of Printed Wiring (AREA)
- Production Of Multi-Layered Print Wiring Board (AREA)
- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Abstract
Description
- 1. Field of the Invention.
- The present invention relates to printed circuit boards used in electronic systems and, more particularly, to a method and apparatus for reworking or repairing printed circuit boards including solder ball grid arrays.
- 2. Prior Art.
- An article in theIBM Technical Disclosure Bulletin (TDB), Vol. 24, No. 2, July 1981, at p. 1237, shows an insulating device for plugging a drilled-out hole in a printed circuit board (PCB). The article does not teach the method or apparatus in accordance with the present invention as taught and claimed herein.
- An article in theIBM TDB, Vol. 33, No. 1B, June 1990, at p. 475, teaches a device for repairing a printed circuit net using a coaxial cable-to-board pin connection. The articles shows a method for reconstructing a deleted internal net of the PCB by utilizing an insulated bifurcate connector pin with an extended tail which provides pluggability with a coaxial cable. The article does not describe how the connector would be connected to pads in a ball grid array, and further, the physical size of the device shown in the article is much too large for use with a ball grid array pattern on a printed circuit board. In any event, the article does not teach nor suggest the present invention as taught and claimed herein.
- An abstract No. 34488, published inResearch Disclosure, December 1992, No. 344, by Kenneth Mason Publications, Ltd., shows a method for repairing open circuits in a printed circuit board. However, the article does not teach nor suggest the present invention as taught and claimed herein.
- An article in theIBM TDB, Vol. 36, No. 12, December 1993, at p. 133, teaches a technique for reworking solder ball connections, engineering change or wire add to a printed circuit board. Although the article shows both via-in-pad and dog bone configurations, the article does not teach nor suggest either the wire loop technique nor the rigid pin structure as is taught and claimed herein.
- U.S. Pat. No. 3,230,297 teaches a circuit board with a connector with solder resistant portions. However, the patent teaches a repair of a simple double-sided board rather than current multi-layer boards, and the patent does not address the problems associated with ball grid arrays as are taught and claimed herein.
- U.S. Pat. No. 3,361,869 teaches an apparatus for making connections to a printed circuit board and for circuit line repair. However, the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 3,406,246 teaches an apparatus for repair of printed circuit lines on a double-sided printed circuit board. However, the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 4,409,732 teaches a circuit isolator element for use in isolating leads while testing components on a printed circuit board. However, the patent does not teach nor suggest the present invention as taught and claimed herein.
- U.S. Pat. No. 4,778,556 teaches an apparatus for correcting or repairing printed circuit boards. The patent only teaches adding conductors to an existing printed circuit board. The patent does not teach nor suggest deletion of printed circuits nor ball grid array processing as are taught and claimed herein.
- Although the prior art generally discusses repairing or reworking printed circuit boards, the prior art does not address the problem of isolating circuits and reconnection to a ball grid array i n state of the art printed circuit board structures which have extremely small spacing.
- It is an object of the present invention to rework or repair a printed circuit board efficiently and at minimum cost.
- Accordingly, 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.
- It is an advantage of the present invention that a printed circuit board may be reworked in such a fashion so as to be compatible with connection of either single wires or twisted pair or coaxial cable. Further, it is an advantage of the present invention that rework of a printed circuit board may be accomplished in a simple and inexpensive manner.
- The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention.
- FIG. 1 is a cross-section view of a printed circuit board prior to a repair or rework.
- FIG. 2 is a cross-section view of a plated-through hole of a printed circuit board after a drill-out operation in accordance with the present invention.
- FIG. 3A is a front cross-section view of a VR pin in accordance with a first embodiment of the present invention.
- FIG. 3B is a side cross-section view of a VR pin in accordance with a first embodiment of the present invention.
- FIG. 3C is a cross-section view of a VR pin inserted in a drilled-out hold in a printed circuit board according to a first embodiment of the present invention.
- FIG. 3D is a top view of a portion of a printed circuit board showing a configuration of the connection wire as it is formed to make secure mechanical and electrical connection with a solder ball pad in accordance with a first embodiment of the present invention.
- FIG. 4 is a cross-section view of a printed circuit board with an insulated wire inserted in the drilled-out plated-through hole in accordance with a second embodiment of the present invention.
- FIG. 5 is a top view of a printed circuit board showing the configuration of the connection wire as it is formed so as to have secure electrical and mechanical contact with a solder ball pad in accordance with a second embodiment of the present invention.
- Referring now to FIG. 1, a cross-section view of a printed circuit board (PCB)10 will be described. Printed
circuit board 10 includes a top printedcircuit layer 12 and multiple internal printedcircuit layers circuit level 20. PCB 10 also includes a number of plated-throughholes multiple level PCB 10.Integrated circuit chip 30 is mounted to asubstrate 32 bysolder connections 34. Thesubstrate 32 is mounted to the top printedcircuit level 12 of PCB 10 by solder ball grid array (BGA) 36. - Although FIG. 1 shows the so-called ‘dog bone design’ of solder ball connections (SBC) where the solder balls are offset from the plated-through holes in printed
circuit board 10, an alternate design would have the solder balls inBGA 36 axially aligned with the plated throughholes circuit board 10. In such alternate design, the wire extending through the top of thePCB 10 must be shortened to avoid short circuiting to adjacent solder balls or pads. - For simplicity, the present invention will be described with respect to the embodiment employing the dog bone design where the solder ball connections are offset from the plated-through holes in the printed
circuit board 10. - Referring now to FIG. 2, the process according to the present invention will be further described. When repair or rework of a printed
circuit board 10 is required, a plated-through hole such ashole 22 is drilled out to remove the conductive material which plates the walls ofhole 22. This leaves a hole without connections between various levels of the multiplelevel circuit board 10. - To achieve the desired repair or rework, a
wire 60 orpin 40 within an insulatingsleeve 62, 48 (see FIGS. 3A, 3B, 3C, and 4) is inserted in the drilled-outhole 22 inPCB 10 such that desired connections can be made betweenball grid array 36 on a top surface ofPCB 10 and other wires, whether single wire or coaxial cable to be connected to the post of a VR pin 40 (see FIG. 3A), or to a tail of wire 60 (see FIG. 4). - Referring now to FIGS. 3A, 3B, and3C, a first embodiment of the present invention will be described.
- A via replacement (VR)
pin 40 is shown in FIG. 3A in a front section view, in FIG. 3B in a side section view, and in FIG. 3C inserted in multi-level printedcircuit board 10 in drilled-out hole (via) 22 and secured by a fluid tight, mechanically strong material, such as epoxy.VR pin 40 has alower post portion 42 which extends below the bottom ofPCB 10, atail portion 44 which extends from thepost portion 42 upward through the via 22, and a Z-stop 46 which controls the vertical positioning of theVR pin 40 within the viahole 22. Awire 46 is attached totail portion 44 by a suitable electrically conductive attachment mechanism such as welding.Wire 46 may typically be a small diameter (approximately three mils) gold plated wire.Wire 46 is of sufficient length to extend out of hole 22 (FIG. 3C) and be bent over and affixed toball grid array 36. An insulatingsleeve 48 is placed over thewire 46 andtail 44 ofVR pin 40. The insulatingsleeve 48 prevents contact between any of the intermediate printed circuit planes 13, 14, 15, 16, 17, and 18 ofPCB 10.Post 42 is the rigid extension ofVR pin 40 which provides sufficient strength and is of appropriate material or plating such that a connection wire (not shown) can be attached by soldering or other means of attachment. - Referring now to FIG. 3B, the side section view of
VR pin 40 will be described.Wire 46 is welded totail 44 ofVR pin 40 as described above. Anepoxy araldite material 50 provides mechanical security betweensleeve 48,tail 44, andwire 46 and provides a liquid tight seal aroundwire 46 andtail 44. -
Wire 46, which extends out of the top ofhole 22, may be bent and formed to be in electrical and mechanical contact withdog bone 52 on which a solder ball of solderball grid array 36 is attached. (See FIG. 3D.) - Referring now to FIG. 4, an alternate embodiment of the present invention will be described. Although FIG. 4 shows a coaxial cable having a
wire 60 surrounded by aninsulator 62 with aground lead 66,wire 60 could also be a single conductor surrounded by aninsulator 62 and not a portion of a coaxial cable. -
Wire 60 embedded in insulatingmaterial 62 is passed through viahole 22 in printedcircuit board 10, and the wire is bent into an appropriate form to match the dog bone configuration (see FIG. 5) for receiving a solder ball of solderball grid array 36. The wire and insulator is held in place and sealed with adhesive 64 which may be an epoxy material. Theground lead 66 of the coaxial cable may be soldered to an appropriate ground connection, and the bottom ofhole 22 may be sealed with epoxy material as described above. - Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (13)
Priority Applications (1)
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US09/938,402 US6437254B1 (en) | 1996-04-25 | 2001-08-24 | Apparatus and method for printed circuit board repair |
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US08/637,947 US5809641A (en) | 1996-04-25 | 1996-04-25 | Method for printed circuit board repair |
US09/023,552 US6018866A (en) | 1996-04-25 | 1998-02-13 | Apparatus and method for printed circuit board repair |
US09/428,750 US6295724B1 (en) | 1996-04-25 | 1999-10-28 | Apparatus for printed circuit board repair |
US09/938,402 US6437254B1 (en) | 1996-04-25 | 2001-08-24 | Apparatus and method for printed circuit board repair |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/428,750 Division US6295724B1 (en) | 1996-04-25 | 1999-10-28 | Apparatus for printed circuit board repair |
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US20020059721A1 true US20020059721A1 (en) | 2002-05-23 |
US6437254B1 US6437254B1 (en) | 2002-08-20 |
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US09/023,552 Expired - Fee Related US6018866A (en) | 1996-04-25 | 1998-02-13 | Apparatus and method for printed circuit board repair |
US09/428,750 Expired - Fee Related US6295724B1 (en) | 1996-04-25 | 1999-10-28 | Apparatus for printed circuit board repair |
US09/428,751 Expired - Lifetime US6115912A (en) | 1996-04-25 | 1999-10-28 | Apparatus and method for printed circuit board repair |
US09/938,402 Expired - Fee Related US6437254B1 (en) | 1996-04-25 | 2001-08-24 | Apparatus and method for printed circuit board repair |
Family Applications Before (4)
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US08/637,947 Expired - Fee Related US5809641A (en) | 1996-04-25 | 1996-04-25 | Method for printed circuit board repair |
US09/023,552 Expired - Fee Related US6018866A (en) | 1996-04-25 | 1998-02-13 | Apparatus and method for printed circuit board repair |
US09/428,750 Expired - Fee Related US6295724B1 (en) | 1996-04-25 | 1999-10-28 | Apparatus for printed circuit board repair |
US09/428,751 Expired - Lifetime US6115912A (en) | 1996-04-25 | 1999-10-28 | Apparatus and method for printed circuit board repair |
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US20090021618A1 (en) * | 2007-07-18 | 2009-01-22 | Peter Schwarz | Image Pick-Up Module |
US8072537B2 (en) * | 2007-07-18 | 2011-12-06 | Karl Storz Gmbh & Co. Kg | Image pick-up module |
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US9322542B2 (en) | 2009-08-12 | 2016-04-26 | Edward Bryant Stoneham | Versatile sealed LED lamp |
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US9927833B2 (en) | 2013-07-22 | 2018-03-27 | Hewlett Packard Enterprise Developement Lp | Motherboard with a hole |
Also Published As
Publication number | Publication date |
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US6437254B1 (en) | 2002-08-20 |
US5809641A (en) | 1998-09-22 |
US6295724B1 (en) | 2001-10-02 |
US6018866A (en) | 2000-02-01 |
JPH1051109A (en) | 1998-02-20 |
JP3925821B2 (en) | 2007-06-06 |
US6115912A (en) | 2000-09-12 |
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