First you do is check board use tester , cable min to ground cable plus connector simcard ,make sure that every check needle of tester move a little.
Points A, B, C and F, tested disposable tester needle should move certainly move but not short-circuit, ground while point D and E, do not connect anywhere .If tested also the needle does not move.
Suppose there are broken jumper as shown below.
Line ok,but still insert sim,use image below
or use other trik
'
Points A, B, and C. try to test use tester, all points tested tester must move, if one of them not move , there is no way, means that there is a path breaking
Points A, B, C and F, tested disposable tester needle should move certainly move but not short-circuit, ground while point D and E, do not connect anywhere .If tested also the needle does not move.
Suppose there are broken jumper as shown below.
Line ok,but still insert sim,use image below
or use other trik
'
Points A, B, and C. try to test use tester, all points tested tester must move, if one of them not move , there is no way, means that there is a path breaking
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