topic Re: LT26i xperia S - no backlight in Other/General

LT26i xperia S - no backlight

raru_mobi — Mon, 29 Apr 2013 21:20:09 GMT

Phone working fine. I can make and receive calls, texts, make photos, internet, etc, but no light into display and keys. I can see on display, but only into some angles, especially in sun . My phone has no guarantee, so i can't send it to sony service. I even updated the software, but no luck Can anyone of you give me the schematic or backlight solution? Thanks!

Re: LT26i xperia S - no backlight

Uliwooly — Mon, 29 Apr 2013 21:28:28 GMT

you will have to replace the LCD

Re: LT26i xperia S - no backlight

raru_mobi — Mon, 29 Apr 2013 21:40:03 GMT

I don't thnik so, because the display is fully working, except the light. It even have no scratch, no cracks, etc. And one more thing: the lights of the bottom keys are not working, too. That's why i'm saying the display is not dead

Re: LT26i xperia S - no backlight

Uliwooly — Mon, 29 Apr 2013 23:31:07 GMT

you can test your phone with

either with

Service menu

http://talk.sonymobile.com/thread/24534

Xperia diagnostic

https://play.google.com/store/apps/details?id=com.sonymobile.androidapp.functiontester&feature=search_result#?t=W251bGwsMSwxLDEsImNvbS5zb255bW9iaWxlLmFuZHJvaWRhcHAuZnVuY3Rpb250ZXN0ZXIiXQ..

Re: LT26i xperia S - no backlight

raru_mobi — Tue, 30 Apr 2013 02:36:07 GMT

Thank you for reply. This is a hardware fault, i already made the test (before asking help on forum).

Re: LT26i xperia S - no backlight

Uliwooly — Tue, 30 Apr 2013 02:55:47 GMT

so what exactly are you looking for?

http://www.xperiablog.net/2012/04/30/xperia-s-disassembly-guide/

Re: LT26i xperia S - no backlight

raru_mobi — Tue, 30 Apr 2013 05:47:52 GMT

I am searching for a service guy who knows where are the light tracks. Thanks!

Re: LT26i xperia S - no backlight

raru_mobi — Sun, 05 May 2013 08:59:14 GMT

Please note that my phone is working good, but no display light, no transparent bar light, no notification light. I'm pretty sure that one diode/coil cause this problem. Please, Sony team answer to me! Thanks!

Re: LT26i xperia S - no backlight

Uliwooly — Sun, 05 May 2013 15:24:20 GMT

if this was my phone, I would re-open my phone and make sure all the ribbons are properly connected

Re: LT26i xperia S - no backlight

raru_mobi — Sun, 05 May 2013 18:18:36 GMT

All rebbons are connected.

Re: LT26i xperia S - no backlight

Uliwooly — Sun, 05 May 2013 18:22:45 GMT

do you see any rust on them? disconnect and reconnect them, if you have an air can use it to clean the board and connectors.

Re: LT26i xperia S - no backlight

raru_mobi — Sun, 05 May 2013 21:07:21 GMT

No rust, no dust, no water damage. All connectors ok, all flex cables ok. I need a response from Sony electronic ingineer / service worker. Please take a look at LT15i light solution , click on picture for zoom: http://repearingtech.blogspot.ro/2013/02/sony-ericsson-xperia-arc-lt15i-display.html

Re: LT26i xperia S - no backlight

Uliwooly — Sun, 05 May 2013 21:13:33 GMT

Contact a Sony moderator or Rickard

http://talk.sonymobile.com/people/Rickard

Re: LT26i xperia S - no backlight

raru_mobi — Sun, 05 May 2013 21:30:51 GMT

Message sent. Hope that Rickard will answer and gave me a good solution. Thanks!

Re: LT26i xperia S - no backlight

Uliwooly — Sun, 05 May 2013 21:40:31 GMT

Anytime, it might take him a while but he is great, you can forward the email to Johan, Jeff, Samuel and other Sony Moderators. once you get an answer please do post it here, I'm intrigued

Re: LT26i xperia S - no backlight

Thommo — Sun, 05 May 2013 23:43:48 GMT

If you have no luck with replies then there are long and tedius ways to fault find broken fuses

1 is and I use this method on Laptop motherboards is to use a multimeter and place the prongs on each end of the fuses at the top as this is metal if you get no current going through then mark it with a pen and keep testing all the others

2 and I do use this method but not often and thats to temp jump the fuse by using is my case a small safety pin and place it across the top of the fuse as mentioned above the tops of the fuses are metal

(Only the ends are metal not the middle part)

If you do find the fuse you could buy a new one from the well known auction site or soldier a bit of safety pin across the top to jump the fuse then cut off any excess but be careful with the soldering part

Re: LT26i xperia S - no backlight

raru_mobi — Mon, 06 May 2013 12:26:39 GMT

I tried to check all the fuses, but some of them are protected by a resin coat. So... let me know, please what is the exactly component. Thanks!

Re: LT26i xperia S - no backlight

Thommo — Mon, 06 May 2013 13:47:21 GMT

I do not know and have no way to test this for you (I no longer own the XS)

I can only give advice on methods to use when fault finding based on my expertise when fixing laptop motherboards

Re: LT26i xperia S - no backlight

raru_mobi — Mon, 06 May 2013 14:41:37 GMT

I hope that someone from Sony to answer and give me the good solution

Re: LT26i xperia S - no backlight

Rickard — Tue, 07 May 2013 09:54:35 GMT

Sorry to hear about the problem with your phone.

I'm afraid we don't have any repair diagrams/instructions to offer. I can only recommend that you contact a service location to have the phone investigated and repaired.