Question about Sony Ericsson W850i Cellular Phone

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Backlight or lcd problem

The time i scroll or get into the menu on my phone, it goes blackout but if im going to use some light or flashlight the LCD part i noticed that LCD is functioning sad to say its hard to see without the aid of a flashlight. please help me to my problem coz its my dream phone and its almost two months since i brought this. Thank you very much.

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Replacing lcd will not solve the problem i have tried it

Posted on Dec 15, 2009

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Hi. It sounds like the backlight of the LCD has failed. If you replace the LCD screen that'll solve the problem. See http://www.formymobile.co.uk/proddetail.php?prod=w850lcd

Posted on Nov 15, 2008

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1 Answer

Lcd tv screen goes black after a few seconds but sound still plays. The flashlight test will show the image for a short period of time but then it goes away and is completely black.


Hello... It sounds like you have a backlight failure, and the image going away during the flashlight test is due to the TV going into "Protection" mode. A service technician may be able to go into the service menu and clear the lamp error codes and get the TV working, or it may need the backlights replaced. I hope this helps...

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How do I troubleshoot my JVC TV model LT-50E350


Your backlights aren't on, I didn't look up the set to see if its a LED or LCD but your going to need to look at the circuitry that supplies voltage to the backlights

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

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1 Answer

Has sound, but why no backlight?


This will get you started on your troubleshooting journey.
Let me know what you find
Troubleshooting LCD Backlight Failure Samsung LNT 4066

Might be the tube light itself too
How To Replace LCD Backlight

Or the inverter
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If you have an LED you might have better luck getting a new TV :(

Feb 10, 2016 | Samsung Televison & Video

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Why is my replacement LED Power Supply Board not functioning properly?


Power supply board is not the culprit - check out your inverter board which is responsible for the back lighting.

Feb 03, 2016 | Samsung Televison & Video

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Video goes out on insignia lcd


An lcd tv has to have a light source behind it to see the picture. Older ones have flouresent tubes. Newer set have light emiting diodes(led). You need to determine if the backlight is turning off or is set loosing signal. If you press the menu button on the Insignia remote does the menu appear on the screen. If not hold a flashlight on the front of the screen. if you can slightly see some video the the back light is off. If the menu shows then check the signal source. If back light is out the replace the inverter board.

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1 Answer

The picture appears for 10 seconds and after that it goes blackout but i can hear the sound.


You have a problem with either the inverter which drives the screen or the backlights in the LCD panel. A new inverter board may cure the problem but more likely the trouble are the backlights failing in which case a new LCD screen is required unfortunately.

Dec 27, 2009 | LG 42LC2RR 42 in. HD-Ready LCD TV

1 Answer

Sony KDL-32ML130 lcd tv


Not really that tough. Sounds as though the backlight is shutting down, either from a power supply failure, or a failure of the backlight circuit itself. You can verify this by holding a flashlight to the screen in the area where the menu usually appears to see if it displayed on the LCD panel with no backlight. If you can faintly see the menu displayed, your backlight has shut down and the most likely cause is the backlight inverter board, followed by the power supply and the backlights themselves which are part of the LCD panel. If you found this information answered your questions, please be sure to rate it. Thanks!

Oct 24, 2008 | Televison & Video

4 Answers

Nokia1600 repairing


hi there sir must go to your nearest service center to replace your LCD it must be damage already. the light of that phone was built-in to the LCD display. and that is why also your keypad doesn't have light cuz' it is series to the display light.


ok!
peace!

Mar 30, 2008 | Nokia 1600 Cellular Phone

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