Sony Xperia Z2 (D6503) Display Non-Functional Post-Replacement: Could a Broken Ribbon be the Cause?

Hello, in my Xperia Z2 (D6503), the display tape broke recently, it cannot be replaced, so I bought the entire display with a frame used to play screen replacement and the like. The display with the frame was purchased, used from the allegro, original, I changed everything and installed it properly and the display does not work. The display is probably functional because the seller checked it before shipping. My only idea why the display may not work is the main tape ribbon marked in the photo, which broke when you moved it. However, it seems to me that it does not matter much to the operation of the display, except that it has been glued so that it should work. All other parts are 100% functional, the phone turns on normally, sounds, vibrates and the charging LED works. Do you think it is this broken ribbon, which in my opinion does not matter for the operation of the display, is the cause or maybe something else?

best regards

Replace the fuse.

So this broken ribbon has no meaning for the operation of the display?

As for the ribbon that you put in the photo, it is crucial for the operation of the display - after all, it connects the display with the motherboard, if the paths from the display are broken, then it's like you wouldn't connect it at all.

The broken tape is from the polyphony speaker. At most there will be no bells. Check if something is visible on the LCD when illuminated by the lamp. It is possible that the LCD is working and does not illuminate the fuse for replacement as plustek wrote.

Indeed, I didn't notice the marked break point.

After the backlight, nothing can be seen. I have no idea what's wrong. I gave the phone to the service because I didn't want to play with it any longer, we'll see what they say.

Write back when you get a diagnosis for a learning purpose for us.

However, I think that it is this fuse, I had the same problem recently.

New replacement ribbons do not work at z1.

The problem was bad insulation of some tape, so if someone is playing with such replacements, I recommend checking the correct insulation. The fuse itself was ok.