Backlight won't work after screen replacement

Question

Huawei P9

Huawei's 2016 flagship smartphone. Features a unibody case and dual rear-camera setup developed in partnership with Leica. Comes in 32/64 GB storage options and six different finishes. Model numbers EVA-L29, EVA-L19, and EVA-L09.

72 Perguntas Visualizar todos

Valentino Poltera @shin3

Rep: 49

2

1

Postado: 26 de fev de 2017

Opções

Backlight won't work after screen replacement

Good evening everyone,

I'm currently writing this because I haven't found anyone that has the same issue as I have. Briefly, I cracked my P9's display 2 months ago and since nobody fixes Huawei's products where I live, I decided to fix it myself by buying a new display on the internet.

At first, I didn't recognise that the display I recived wasn't the right one, the cable was black so it was supposed to be for the Lite version of P9 (great sellers...). As soon as I connected anything I turned it on but I could see pretty much nothing. Then I finally realized it was not compatible with my phone, then I ordered a new brand one once again, this time from another seller though. I was so happy that I could finally fix it and be sure it was going to be compatible (in fact it is compatible): same problem, I can hear every single sound, everything works but the display doesn't show up.

Now, I can see the screen with a lamp on it and the touch works perfectly, so surely the problem is the backlight that doesn't turn on at all.

Is it possible that I broke something on the mobo or the display that wasn't compatible messed up the display connector? I'm not trying to buy a new display because I'm mad at this and I won't waste a single penny on it furthermore.

Thank you in advance.

P.S. The displays are both Huawei original brand.

Respondido! Ver a resposta Também tenho esse problema

Esta é uma boa pergunta?

Sim Não

Pontuação 4

1 comentário

i have same problem

2 de ago de 2017 por denz_dumalz_08

Adicionar um comentário

13 respostas

Solução escolhida

Ben @benjamen50

Rep: 159,7 mil

Mtwo Perform

11

191

368

Postado: 5 de mar de 2017

Opções

I'm surprised people are blowing up backlight circuits for Huawei P9 screen replacement. Did you guys forget to unplug the battery first?

Esta resposta foi útil?

Sim Não

Pontuação 4

1 comentário:

Actually I don't remember what I unplugged first, it could be that I unplugged the screen contact first, yes.

6 de mar de 2017 por Valentino Poltera

Adicionar um comentário

Actually I don't remember what I unplugged first, it could be that I unplugged the screen contact first, yes. — Valentino Poltera

Mamadou amadou @mamadou_amadou Rep: 25 1 · Answer 1 · 2017-02-27T14:38:22-07:00

Mamadou amadou @mamadou_amadou

Rep: 25

1

Postado: 27 de fev de 2017

Opções

Hi, have the same problem, I think the backlight diode is not working but I don't know when is it placed on the mobo and how to replace. There is many issue on iPhone 6 but nothing on any Huawei

Esta resposta foi útil?

Sim Não

Pontuação 2

1 comentário:

Hello do you know what the diode?

5 de mar de 2017 por pc repair

Adicionar um comentário

Cristi Noana @cristinoana Rep: 25 2 · Answer 2 · 2017-10-30T05:46:38-07:00

Cristi Noana @cristinoana

Rep: 25

2

Postado: 30 de out de 2017

Opções

Try this solution and say thanks to the good man

http://forum.gsmhosting.com/vbb/f846/hua...

Esta resposta foi útil?

Sim Não

Pontuação 2

3 comentários:

How do you short something?

9 de mar de 2018 por Pieter

Grand merci a vous les amis, ce poste m'a été d'un grand secoure.

6 de jul de 2018 por BAKAYOKO

Hello, i did everything like they said it in the forum, but the backlight still stays off. I'm not quite sure why, because everthing else works fine. Any ideas - Thank you.

2 de abr de 2019 por Stefan Hörmann

Adicionar um comentário

kaspernobel @kaspernobel Rep: 13 1 · Answer 3 · 2018-06-07T08:31:24-07:00

kaspernobel @kaspernobel

Rep: 13

1

Postado: 7 de jun de 2018

Opções

Has anyone already found a solution? I think I screwed up the backlight circuit indeed. I did see the post on the jumper for a p9 lite.. but haven't found a similar diagram for the p9.

Esta resposta foi útil?

Sim Não

Pontuação 1

1 comentário:

Same problem here, I can't find the similar diagram for mine P9.

12 de jun de 2018 por Christian Rollmann

Adicionar um comentário

Pieter @pwillaert Rep: 494 16 2 · Answer 4 · 2018-06-08T01:17:01-07:00

Pieter @pwillaert

Rep: 494

16

2

Postado: 8 de jun de 2018

Opções

So I had the same issue, I was able to fix it by following something i found on a forum that was mentioned here. See this diagram

Esta resposta foi útil?

Sim Não

Pontuação 1

2 comentários:

Nice! Could you also post a link to the post where you found image? I need to know the second spot on the motherboard for the jumper. Or even better, how did you fix it?

9 de jun de 2018 por kaspernobel

http://forum.gsmhosting.com/vbb/f846/hua...

I took it to a shop because I can't do the smd soldering myself. I think i paid €25.

I removed the motherboard and gave it to them so all they had to do was place the jumper. It worked so i'm happy.

10 de jun de 2018 por Pieter

Adicionar um comentário

peikin @peikin Rep: 1 1 · Answer 5 · 2017-05-13T09:34:16-07:00

peikin @peikin

Rep: 1

1

Postado: 13 de mai de 2017

Opções

any solution?? I have the same problem, my screen broke and I changed it by a new one that worked for an hour, but after that the screen turned off but operating system is still turned on, I have tried 2 screens and nothing, what is the problem??

Esta resposta foi útil?

Sim Não

Pontuação 0

Adicionar um comentário

Kalemaroni @kalemaroni Rep: 1 1 · Answer 6 · 2017-07-31T17:59:22-07:00

Kalemaroni @kalemaroni

Rep: 1

1

Postado: 31 de jul de 2017

Opções

Also looking for a solution to this. Unplugged battery as always before changing screen. 2 screens no backlight. Anyone know where the backlight diode is?

Esta resposta foi útil?

Sim Não

Pontuação 0

1 comentário:

Try this solution and say thanks to the good man

http://forum.gsmhosting.com/vbb/f846/hua...

11 de out de 2017 por Cristi Noana

Adicionar um comentário

Παναγιωτης Μακρης @panagiotism8146 Rep: 1 · Answer 7 · 2017-12-06T15:46:33-07:00

Παναγιωτης Μακρης @panagiotism8146

Rep: 1

Postado: 6 de dez de 2017

Opções

I have probably the same problem. I have changed two LCDs the backlight I think isn't working correct because the lightning did not increase at all and some times the screen is flickering. I have changed and the battery but nothing. Any thoughts?

Esta resposta foi útil?

Sim Não

Pontuação 0

Adicionar um comentário