Method and apparatus for interim assembly electrical testing of circuit boards
First Claim
1. A method for assembling a circuit board whereby high temperature attach devices can be electrically tested prior to the joining of permanent low temperature attach devices, the method comprising the steps of:
- (a) joining at least one high temperature attach device onto a circuit board;
(b) placing a test interposer with a least one low temperature known good reference device mounted on said test interposer in electrical contact with said circuit board and said at least one high temperature attach device;
(c) testing said at least one high temperature attach device while said at least one high temperature attach device is in electrical contact with said at least one low temperature known good reference device to identify defective high temperature attach devices;
(d) removing said test interposer from said circuit board;
(e) performing the following steps only if a defective high temperature attach device is present;
(i) removing defective high temperature attach devices if any are present, from said circuit board;
(ii) joining additional high temperature attach devices to replace defective high temperature attach devices, if any are present;
(iii) placing said test interposer with said at least one low temperature known good reference device mounted on said test interposer in electrical contact with said circuit board;
(iv) retesting said at least one high temperature attach device while said at least one high temperature attach device is in electrical contact with said at least one low temperature known good reference device to identify defective high temperature attach devices;
(v) removing said test interposer from said circuit board; and
(vi) repeating steps (i) to (v) until no defective high temperature attach devices are present; and
(f) joining at least one permanent low temperature attach device on said circuit board to complete the circuit board assembly.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and a structure for assembling a circuit board whereby high temperature attach devices can be electrically tested prior to the joining of permanent low temperature attach devices. A test interposer, with low temperature attach known good reference devices, is placed in electrical contact with the circuit board containing high temperature attach devices. The test interposer/circuit board assembly can be used to identify any defective high temperature attach devices which can be replaced prior to joining the permanent low temperature attach devices on the circuit board. This partial interim test, when only the high temperature attach devices are mounted on the circuit board, eliminates the need to remove known good low temperature attach devices from the circuit board during the high temperature attach device rework process.
14 Citations
18 Claims
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1. A method for assembling a circuit board whereby high temperature attach devices can be electrically tested prior to the joining of permanent low temperature attach devices, the method comprising the steps of:
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(a) joining at least one high temperature attach device onto a circuit board;
(b) placing a test interposer with a least one low temperature known good reference device mounted on said test interposer in electrical contact with said circuit board and said at least one high temperature attach device;
(c) testing said at least one high temperature attach device while said at least one high temperature attach device is in electrical contact with said at least one low temperature known good reference device to identify defective high temperature attach devices;
(d) removing said test interposer from said circuit board;
(e) performing the following steps only if a defective high temperature attach device is present;
(i) removing defective high temperature attach devices if any are present, from said circuit board;
(ii) joining additional high temperature attach devices to replace defective high temperature attach devices, if any are present;
(iii) placing said test interposer with said at least one low temperature known good reference device mounted on said test interposer in electrical contact with said circuit board;
(iv) retesting said at least one high temperature attach device while said at least one high temperature attach device is in electrical contact with said at least one low temperature known good reference device to identify defective high temperature attach devices;
(v) removing said test interposer from said circuit board; and
(vi) repeating steps (i) to (v) until no defective high temperature attach devices are present; and
(f) joining at least one permanent low temperature attach device on said circuit board to complete the circuit board assembly. - View Dependent Claims (2, 3)
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4. A structure for electrically testing the high temperature attach devices on a circuit board prior to the joining of the permanent low temperature attach devices, comprising:
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a circuit board;
at least one high temperature attach device joined on said circuit board;
a test interposer;
cutout areas in said test interposer corresponding to the size and location of said at least one high temperature attach device on said circuit board;
at least one low temperature known good reference device mounted on said test interposer and connected to at least one compliant connector for making electrical contact to said circuit board, said test interposer in electrical contact with said circuit board, and said test interposer further comprising conductive vias and said at least one low temperature known good reference device is mounted on a surface of said test interposer which is not contiguous with said circuit board. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification