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Sony Xperia M4 aqua was released 2015, June. With a Size of 5.0 inches, it was operated in Android OS, v5.0.1. Sony Xperia m4 Aqua has internal of both 8 GB, 2 GB RAM/ 16 GB (E2306) And it has 13 MP Primary Camera and a 5MP Secondary Camera. This phone has a non-removable Li-Ion 2400 mAh battery.

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Is this a backlight problem?

Ok so recently i changed my m4 aqua display(bought from ebay)

It started on.When i was unlocking my phone the display switched off but touchscreen still working, Its not a sowtware problem because i reinstalled fresh copy of android trough pc companion. Later i installed same old display and still the same problem. Sound touch vibration working but display not showing... i read that it may be a backlight problem that it stopped working or something.

Answer this question I have this problem too

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Hi!

It sounds like you may have blown out your backlight circuit. Is there a very faint image visible if you clean the glass really good and shine a bright flashlight on it at an angle? If so, then that's a bad backlight.

Cheers!

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4 Comments:

so how do i fix it?

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This is most likely something that you will need a skilled micro-solderer to handle. I think that the real problem may turn out to be a lack of schematics and technical data needed to even find which component has failed. Microscopic examination *may* reveal which component(s) failed, but is not 100% certain.

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maybe this is caused by a burnt fuse?

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I would even say that it is very likely @chappylv ! The real challenge will be to determine where the burnt out little guy is.... If it's a failed filter (often called a fuse in these devices, but truly a filter) there is often a visible solder ball on one side or the other, or one of the metal ends will be blown off.

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@chappylv could be a filter (fuse) but before you go ahead and look for somebody who can do the microsoldering part for you, replace the display assembly. At least that way you can either rule it out, or rule in it, as the culprit. One of the main issue is going to be the unavailability of Sony schematics. Sony has stopped even making schematics which will make it difficult to trace components for failure.

Here is the trouble shooting sequence from Sony:

Check:

Check whether the phone vibrates after the on/off key has been pressed.

Action:

If the activation described above is not detected, refer to section 1.1 ‘Power’.

Check:

Check the connection between Display FPC and Main PBA.

Action:

1. If not properly connected – disconnect and reconnect.

2. If dirty or oxidized – clean the connectors.

Check:

Replace the Main PBA with a known working one and test the Front Cover Assy.

Action:

1. If the Front Cover Assy is still not working – replace it.

Run Touch Panel Calibration after replacing Front Cover

Assy according to 1297-3232!

2. Replace Main PBA.

1.6.1 Illumination

Check:

Inspect external port of Light Sensor on the Front Cover

Assy.

Block Image

Action:

If dirty – clean it.

Check:

Inspect the Light Sensor on the Main PBA.

Block Image

Action:

1. If dirty – clean it.

2. Replace Main PBA.

No, you do not have to necessarily replace the PCB. There are ways to create new backlight ways if it is a component on the board etc. Let us know what you find.

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3 Comments:

vibration working, small front led working, already swapped to old display and then again to the new one.

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Neither old nor new one working? Checked the components on the motherboard? Anything obvious?

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nothing obvious... looks like new, with a bit of glue!

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igors riekstins will be eternally grateful.
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