Huawei P9: Backlight Not Working Post-LCD Replacement - Seeking Schematic & Fuse Info

Question

Hello
The backlight stopped working after the LCD was replaced. When plugged in while checking everything was ok. After folding it was not. Has such a case happened to someone in this model? Some fuse? Best of all, does anyone have a schematic for this phone?

KRY5PIN · Answer

Did you replace the whole sett lcd + digitizer with frame ?? Or did you want to save and bought lcd + digitizer alone ?? If the latter, I will tell you what you did: you pressed the tape too much and damaged it. Try to send back for a warranty, maybe they will replace it and if not, buy a new one.

Maskbiznezstudio · Answer

I replaced the set itself without a frame.
Today, such a strange situation: I found another beaten set from the exchange some time ago, after plugging it, the backlight works but it does not display anything, surprisingly, now I put the broken one and it started to highlight also without displaying. I do not have a new one at the moment to put it in and check it, and the phone has to be returned tomorrow, so I won't be able to find out.

fossa · Answer

The backlight converter probably fell. I have the same problem. I am looking for a schematic and can not be found anywhere. Maybe someone will have forum viewers?

bogdan2491 · Answer

Before you start replacing converters and fuses, it is best to connect a 100% working set. If you have the opportunity to post on the forum the most clear photo of the connector and the area of the display ribbon connector (on the motherboard).

fossa · Answer

Different 100% good lcd checked, same effect. After replacing the lcd, it got hot at the connector and the backlight disappeared until it finally fell off completely. That is why I am looking for a scheme ... This is, unfortunately, the end of establishing Chinese substitutes.

bogdan2491 · Answer

I manage to regenerate most p9 lite and displays in general, so I treat replacements as a last resort and install them very rarely, maybe that's why no discs have arranged for me yet. In the previous post, I meant the author of the topic, because he has highlighting

szabranit · Answer

Hello, please check if you also have a burned out contestant, as it seems to me, under this badge on the right

eNWueM · Answer

Hello, was the problem solved? I have the same situation.

kamil2114 · Answer

Which P9 lite version are we talking about?

bydlak · Answer

The problem lies in the lack of tape on the soldered joint on the left in the photo from the LCD backlight. You need to stick a piece of ribbon that is not included in the substitutes.
Usually, after firing with no tape, the coil under the screen on the board burns due to a short circuit. After replacement it is OK

Huawei P9: Backlight Not Working Post-LCD Replacement - Seeking Schematic & Fuse Info

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