Patent ID: 9383401
Filing Date: 2016-07-05
CPC Classification: G01R,G11C,H01L,H05K

Claim Text:
1. An electronic device comprising: a main board; a plurality of electronic substrates each being mounted on the main board via a plurality of solder joints; a first chain to connect the solder joints in series throughout all of the electronic substrates, the first chain comprising a plurality of second chains each being a part of the first chain and connecting the solder joints in each corresponding one of the electronic substrates; a measuring unit to measure an electrical resistance of the first chain and electrical resistances of the second chains; and a controller configured to control the measuring unit to measure the electrical resistance of the first chain to obtain the electrical resistance of the first chain, when the electrical resistance of the first chain is equal to or higher than a first threshold value, control the measuring unit to measure the electrical resistances of the second chains to obtain the electrical resistances of the second chains, and detect the second chain having the electrical resistance equal to or higher than a corresponding second threshold value from among the second chains, wherein the electronic substrates are stacked in a thickness direction of the main board, and the electronic substrates are mutually joined via the solder joints.