El iPhone 5s de Apple fue anunciado el 10 de Septiembre, 2013. La reparación de este dispositivo es similar a los modelos anteriores y requiere destornilladores y herramientas de palanca. Disponible como GSM o CDMA /16, 32, o 64 GB / Plata, Oro, y Gris Espacial.

Preguntas 3834 Ver todo

iPhone 5S no display but backlight


Happy to send my first message on this forum! :)

So my request is about an iPhone 5S.

He start completely but nothing are display and the backlight still works.

L19 coil has a little water damage, the pin 1 of L19 probably short to the gnd through the metal plate.

But he seems no dead, how can I test it properly?

And are there any other parts to test in this area of the logicboard known for display issues?

Can this coil cause that or it's more like a death of the U3 LCD controller chip ?

Help me understand please..

Thanks in advance!

Contestado! View the answer Yo también tengo este problema

Es esta una buena pregunta?

Calificación 0


So after peeling iPhone 5S diagrams, I just check the power input and I find the standart value : 1,8V / 6V / +5.7V / -5.7V

Does it always point to U3?


Agregar un comentario

¡Envío gratuito para todos los pedidos de más de USD100 o que contengan un Pro Tech Toolkit!

Visita Nuestra Tienda

1 Respuesta

Solución Elegida

I am concerned about your comment "has a little water damage". Water damage can be very insidious. Although you may see just a bit, there can be extensive water damage under the shields, under the IC's etc. Sometimes the repair is straightforward, other times it can require extensive troubleshooting. The best thing to do first is a complete decontamination, then troubleshoot.

Are you an experienced tech looking for detailed help or an avid DIY'er looking for guidance? If the latter, then look for an experienced shop specializing in micro-soldering and water damage repair.

Update (11/22/2016)

Generally speaking, coils such as L19 rarely go bad. They are, by design, a short circuit. That said, some corrosion may have eaten through the wire and made it an open-circuit but that should be easy enough to check. You can remove L19 to check it properly. Also check the bare pads to see if they are not shorted to ground.

L19 connects from PP_VCC_MAIN to Chestnut. What voltage do you read there?

If everything looks okay, including the coil, I would try to replace chestnut.

Fue útil esta respuesta?

Calificación 1


Thanks to answer!

Yes I know the ravages that can cause oxydation..! But in this case, the emi shield showed signs of water in a restrained area of the board, precisely on L19 coil.

And yes I forgot to specify that the phone was properly cleaned in isopropyl alcohol (without emi shield) before anything.

I'm refurbishment tech but I would learn the hardware troubleshooting. I have knowledge in micro soldering and electronic.

So I believe I'm looking for tech who have encountered this kind of problem.


Agregar un comentario

Añadir tu respuesta

Arthur Trouillot estará eternamente agradecido.
Ver Estadísticas:

Ultimas 24 Horas: 1

Últimos 7 Días: 20

Últimos 30 Días: 70

Todo El Tiempo: 1,339