iPhone 6S half backlight need solution

Question

iPhone 6s

Lanciato il 25 settembre 2015. Modello A1688/A1633. Si ripara in modo simile alle generazioni precedenti, richiede cacciaviti e strumenti di apertura. Versioni GSM o CDMA /16, 32, 64, 128 GB / Oro rosa, Oro, Argento, Grigio siderale.

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Ajit Sable @doctorgadget

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Postato: 18 mar 2019

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iPhone 6S half backlight need solution

I got device which was having no backlight at all , after diagnosis I found the filter capacitor was Burnt instead of changing the capacitor with new one , I did direct jumper , this cause backlight came but the half side of lcd , how to get other half backlight of iPhone 6S

should I put the capacitor on , or change the backlight ic ?

Please share the solution I and Save the phone , as this is my first quation to the forum , please guide me, thank you .

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arbaman @arbaman

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Postato: 18 mar 2019

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There is no way to tell for sure without testing where the problem is. Backlight is brought to screen with one anode and two cathods. Each line protects the board with one filter, which is there to shield the backlight driver and components. Sometimes damage is limited to the filter, other times it goes further. Bridging a filter is a bad idea as any injury to the screen next time will likely directly destroy the backlight driver, capacitors, inductors and so on.

You can try replace all filters, if backlight is still half faulty you’ll have to dig deeper in the circuit.

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i change one capacitor , could you tell us which is another filter capacitor of backlight

18 mar 2019 da Ajit Sable

@doctorgadget You'll have to replace FL4211, FL4212, FL4213 or make jumpers for testing purposes. They're not capacitors though, they're ferrite beads. If you were to bridge a capacitor all you would get would be a shorted to ground line.

19 mar 2019 da arbaman

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i change one capacitor , could you tell us which is another filter capacitor of backlight — Ajit Sable
@doctorgadget You'll have to replace FL4211, FL4212, FL4213 or make jumpers for testing purposes. They're not capacitors though, they're ferrite beads. If you were to bridge a capacitor all you would get would be a shorted to ground line. — arbaman