Replaced Screen But Blank Display

Hi,

I had the same problem. When you google it, you find lots of software solutions, resetting and firmware reloading and so on, which did not work for me.

I also replaced the screen which I have done many times before, but this time eventually I blew the fuse for the LCD backlight.

So please try to take a very bright light from your desktop lamp or LED-torch and shine light _through the back_ of the LCD. Of course you have to be careful to keep all that mainboard, LCD and torch in one hand and have the other one to operate the buttons. You should avoid to create just another short on the power supply and blow even more things... However, if you see your display working with your home made backlight, then this reply is for you.

I found the solution at http://progulki.com.ua/sony-xperia-z3-co...

and also here: http://www.mobilerdx.com/2015/03/sony-xp...

There it sais it is for Xperia Z3 but in fact it is Z3C and the picture rotated :-)

There are pictures where on the mainboard the fuse resistor for the backlight is located. You can throw this russian page into google translate and get an idea whats happening. You will have to open one of the metal shields. I did this with a skalpel and bend them slightly. Then, you have to cut away a little bit of the frame which is soldered onto the mainboard. Be very careful here! You can cut it at two points, but then it is still soldered to the mainboard underneath! Unfortunately, I ripped it off and it took the first layer of the mainboard away with it. I could actually see PCB traces of layer 2 bare naked. You could avoid this by unsoldering it, once it is cut at the left and right... However, even with that damage, my phone is working fine again.... Allright, locate the fuse. With mine, you could really see that it had a crack through its case. So I was quite sure that that device really was broken and could potentially make an error.

You could make a short over it, or you could unsolder it and then short the two pins. However, you would lose the safety feature of a fuse there. So get yourself a SMT Resistor, 0402 case, 0 Ohm, 63mA ! This will blow, if you should accidentally pull too much current next time ;-) Rather this one, instead of the LCD backlight driver IC... You can get this Resistor in any electronic devices shop. I used a CRG0402ZR (you can google it). Once soldered that one in, my backlight and whole LCD was working again. I was also able to get the metal shield back on and my Xperia is as good as new again.

Also: If you put it all together and you are stuck with a 50% battery charge which would not load nor discharge: then you did not fix the battery connector properly. The phone works but it is missing the connection to measure the capacitance. Refit it and you will be back in the game. I hope this helps to fix the best phone in the world :-) Cheers.

I found that the chips on the right connector at the bottom of the LCD orange connector protruded more than the original screen. The metal cage that holds the screen connectors down, shorts out the chips. If you removed the metal cage, the screen will display. I used some tape on the metal cage to stop the short. For more info contact me through Flash File

I've fixed a lot of Z series displays, it seems they're very hit and miss or, they're incredibly fragile.

Did you try and test the LCD before installing? I think bending the flex cables like so can do damage, I don't bother doing it anymore and make sure the LCD is in the intended position (without frame adhesive) and then test it when it's installed into the frame.

Did you say you tried the old LCD and it's showing the same signs as the new LCD?

I'm having the same exact problem.

May be your cable is not installed well , or your cable is broken

This you tube advice worked for me - https://www.youtube.com/watch?v=pCTQgZ20...

I have the same exact problem. waiting for replies.

My issue is similar. I'm pretty sure the problem is related to the screen not fitting properly into the frame. The screen is bent very slightly (light is leaking along the sides) and the LED seems to be separating from the glass. Or it could be a pressure sensor issue? Mine worked before I tried gluing it down. It also worked intermittently before I put it into a snap case. At one point it told me to close the cover for the charging port which was already shut. That's what made me think pressure sensor. I'm going to have to try re-adhering both the front and the back and clamping them. Wondering if I should buy a new frame, but I'm kind of sick of dealing with it.

This is what I found:

I disconnect the cable for the digitizer (touch screen), and the LCD *will* work.

Connect mouse with OST cable, and you can control your Xperia again.

So issue looks like the digitizer...

I think the OS cant cope with the firmware of the digitizer, and the digitizer firmware must be upgraded.

I had this one time before, and I solved it with a firmware update (PC companion - Software repair, don't need a working LCD to do this, or disconnect the digitizer, connect an USB mouse with the OST cable, and upgrade firmware from android).

Anyways, in this last case, firmware did not work for me.

Any ideas are welcome.

By the way, if you can find the youtube instructions... Please post!

I possessed the same problem , after I replace lcd , lcd I found a blank black problem , but with the startup sound .

possible motherboard must jumper

Hi all, just installed a new LCD on a z3 compact and now neither the old or the new LCD works. Can't seem to gain access to fuses so wondered if there was anything else to try?

I replaced new lcd for me z3c but still not work lcd is black please help

Have the same problem guys.

Sony has made a rubish phone that is just not designed to be opened....

3 screens and all black with back light working....

Rubish Sony phone. Worst ever smartphone.

this is solution update software work for me

https://www.youtube.com/watch?v=w7yHesTG...

I had exactly the same problem. I did extensive testing and found that the display would light up but no video was displayed. I found that the chips on the right connector at the bottom of the LCD orange connector protruded more than the original screen. The metal cage that holds the screen connectors down, shorts out the chips. If you removed the metal cage, the screen will display. I used some tape on the metal cage to stop the short. For more info contact me through JP Computers

http://progulki.com.ua/sony-xperia-z3-co...

work for me