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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Sony Ericsson > Sony Ericsson Hardware Repair

Sony Ericsson Hardware Repair Post here your Hardware Repairing Hints or Problems with SonyEricsson and Sony Phones.

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Old 11-10-2016, 17:29   #1 (permalink)
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Xperia Z5 boot loop, backlight only


Hi,

I have a problem with my Sony Xperia Z5.
One day on low battery it powered off, then it won't turn on.
When turning on, I can see only backlight (no sony logo etc.), then after 5-10 sec it reboots and red led blinks 3 times.

I actually tried software reset, so it probably should be HW issue.
Phone has a not original replaced screen (working 2-3 months). But this issue also persist with original broken one.

I see some similar topics but related to backlight issue..
Please help!
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Old 11-11-2016, 15:07   #2 (permalink)
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same problem

i have same problem with this model, sony xperia z5 e6653.
After screen replacement, when i turn on the phone: backlight on>backlight off> 3 times red leds> restart. Boot loop.
There is one strange thing... when i turn on the phone without the LCD, it hasn't problem... because pc recognize it like mass memory.
whit microscope i see nothing damaged.. filter works perfectly.. i don't know!
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Old 11-12-2016, 02:17   #3 (permalink)
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I have E6633 model.
With screen disconnected it also keeps restarting. So you are lucky, and able to copy data from internal storage.
I flashed mine many times after this failure. Maybe it is why it is not starting even with screen disconnected.

Of course device is recognized in flash/fastboot modes and not rebooting with or without screen.
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Old 11-12-2016, 10:43   #4 (permalink)
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yes

Yes, probably is your flash, but i don't know what it is, i tell the problem at the seller and he send me immediatly a refund, two display with the same problem, can it be only the display defected? A lot of display with this problem?
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Old 11-16-2016, 13:42   #5 (permalink)
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So it is finally working for you with new display?
I'm not sure it would be flash, I do not touch bootloader, and sw restored from xperia pc companion tool.
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Old 11-17-2016, 20:55   #6 (permalink)
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Hello,

I have the same problem with several Z5 devices
After replacing the display the mobile phone hangs in this reboot loop.
Previously, the fuse on the LCD connector is usually defective and replaced by a jumper.
The software is original and loaded with Companion.
Does no one have an idea?
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Old 11-20-2016, 12:57   #7 (permalink)
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Quote:
Originally Posted by hadespl View Post
So it is finally working for you with new display?
I'm not sure it would be flash, I do not touch bootloader, and sw restored from xperia pc companion tool.
now i changed display, and it work perfectly, but there isn't image.. only backlight on.. but phone doesn't go in bootloop, it is very strange...
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Old 11-20-2016, 16:27   #8 (permalink)
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SOLVED, i check and a fusible (L) near lcd connector was interrupt, i made a jumper and now image is ok!!!
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Old 11-21-2016, 16:09   #9 (permalink)
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Like this one?
fs5 . directupload . net / images / 160614 / 83w9wqjc . jpg

Is there any way to check it before soldering?
edit: sorry for spaces in link but I haven't achieve enough posts to send links
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Old 11-27-2016, 14:55   #10 (permalink)
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Hello,i'm having the same problem and i did removed the fuse and made a jumper the LCD came back but when i turned it on Xperia logo and sony pop up and after 3 sec again black light and phone shutdown? any suggestions what can cause the problem ?
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Old 12-06-2016, 13:02   #11 (permalink)
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Shutdown or reboot? Did you flash SW? if so it could be also SW related in your case.
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Old 12-08-2016, 11:27   #12 (permalink)
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The problem was in the LCD i tried whit the original LCD and no problem
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