No back light or very dark display on iphone

A strainge problem occure some when there is a replacement screen installed on your iphone or the iphone was liquid damaged. The iphone display lighting mechanism is very cpmplex ans secure. It contains back light voltage filter, diode, back light driver ic (12 pin) , back light coil and capcitpors. Most of the time the problem cause by voltage filter which is inserted between the lcd screen PCB connector and and the back light display driver. When the filter detect uneven voltage passing through the filter it just blow up and disconnect voltage from display driver towarf lcd screen the purpose of this is very simple to protect the circuit board from getting more damage from the lcd screen uneven voltage behaviour

There could be other reasion as well

Capasitors get short circuit

Coil cloud burn or back light driver blow up

All could be repaired 

MAhmad

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