In diagram red lines show network path and blue line show antenna path. first of all check antenna is not broken and its points are in good condition and not water damaged or carbon is not on them. then make jumper on antenna as shown in diagram so that if it is discontinued then can be in normal flow.
Then heck red lines and red box parts and resold them with hot air so that if any of them is not showing continuity then can be in normal flow and pass the signals.
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