Hello
This solution provide some simple tricks on how to diagnose this problem, if encountered that only test mode showed on the LCD screen display, you may try to replace a new battery on the device. If after changing the battery doesn't fix the problem, you may refer to the solution below for it shows the certain components that needs to be remove or replace to fix the problem.
Try to remove or replace the ESD protection diode. This components were composed an ESD protection diode and a capacitor and it result to test mode problem if being damaged.
Hope it helps, if so do rate the solution
Good Luck
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