In iPhone 4s FL4_RF burnt
In iphone 4s FL4_RF (backside of wifi chip) gone short.If I remove it what affects or bypass will works?
Is this a good question?
I'm not sure what you mean by "burnt" do you see black marks/visible damage, water damage oxidation?
If no---then in my experience no WiFi in a 4S is always the WiFi chip itself needs to be replaced.
If yes---then in my experience it is the WiFi coil that is short due to water damage.
I, too, used to take off this filter and I know there are several solutions out there that recommend taking of the filter to restore WiFi---this is generally helpful only because the heat of that operation will sometimes "reflow" the WiFi chip. Of course it is not an actual reflow, but that chip does like to get warmed up if it is acting up.
If you've tried 'reflowing' the chip, then you'll have to have it replaced to get your WiFi back.
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