Solved Shuts Down No Signal And Battery Problems Only With Sim Card Inserted Iphone 1St Generation

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I have 3 iPhones with the same symptom. Battery goes down quickly, shuts down or no signal ONLY when you insert de SIM card. I’ve tested all these 3 iPhones with no SIM card, and they don’t shut down, no baterry drain. I’ve tested with several SIMs cards that work perfectly in other devices (I mean other iPhones)

in my opinion - there are 2 possible problems (if fluid damages are ruled out in the first place) 1, the batteries are extremely weak - as soon as the phone uses the mobile phone part - the battery crashes 2, the Skyworks GSM/Edge Power amplifier (SKY77340) is faulty

(top right on the picture) i use an infra red thermometer to find those faulty parts but as i said, those two things are pretty common failures on other phones

I am having the same problem with all the nokia phones I have, with one particular sim. Even with those phones that work fine with other sims. - Help!