Question about Sony Ericsson W850i Cellular Phone
What are the signs of a failing LCD?
Like other LCD display screens for computers, the failure can be a hardware failure of the screen itself or a poorly connected or faulty ribbon cable inside the device. Perhaps you've already considered having the telephone professionally repaired by the manufacturer or an after market cell-phone repair shop. If you ruled that out because of the cost, and have looked for and received help to ensure there is not a software setting or screen adjustment or reset-to-factory fix for this, then you could be brave or foolish and go ahead and open up the device on your own. If the device is out of warranty and you want to give it a try, and you are about ready to throw away the device anyway, you are a candidate to attempt you own device repair. Get a size 0 and maybe also a size 1 Phillips screw driver from a hobby store or model railroad store or electronics supply store. Power off the device. View the service manual if possible, perhaps by asking for a schematic or device diagram or "exploded diagram" from the manufacturer or by asking at the library, which subscribes to many services that provide device schematics. Print the pages that show how to open the case. Print the pages that show how the small cable connects from the display screen to the circuit board. Open the access cover for the battery and remove the battery and any sim card or SD memory cards. Check for and pull at any rubber spots or rubber dots to see if a screw is hidden under the rubber spot or rubber dot or pad. Unscrew the small screws around the edges of the device a bit, just loosening them each a little. See if the case is beginning to open. Proceed to open the case while sitting or standing at a clean flat well-lighted work surface that is not near a sink or any drains. Make a drawing of the device and show the spots where you remove the screws. Access and check the small cables and see if you can make the connection more secure by pressing the delicate ribbon cable a bit further into the connection on the circuit board. Amazing it is, that the little thin and delicate connection even works at all. Write down the part numbers you can find and take a few pictures as you proceed, and if you succeed it getting it all put back together and it works, then it was just a problem of a loose connection to the display device. Share the results here or on your own website or other repair forums; many will be delighted to learn of your success. If you want to have a service shop try to fix your device, you might ask any cell-phone sales shop personnel where phone parts are available, such as a replacement antenna for your phone, then perhaps also ask if they do device repairs on site. You'll learn that a repair shop fixes several brands of phones, as the insides, the components of many devices are actually rather similar. I looked up cellphone repair and the telephone area code where I live and I located some repair shops immediately using a web search of the Internet. In Phoenix, Yakety Yak Wireless and Wireless On at 742 E Glendale Ave, Ste 120, Phoenix Arizona 85020 both provide some cell-phone repair.
Finally, check with the manufacturer about putting the telephone back under a post-purchase manufacturer warranty; some companies will let you do this and then provide the repair. Other companies require the repair be completed and paid for and then may have an option to add an extended warranty after the device is fixed. Does not hurt to ask and to get the details.
Here's wishing you well!
Posted on Oct 11, 2008
The problems you will get with a failed lcd is that the screen will light on/off bit like flashing lights the letters on lcd will sometime have line across the screen or some numbers will be missing also the signal on your phone network bars will drop can not make any calls freeze up that sort of problems you will experience with a faulty lcd screen i hope that helps you to identify your solution
Posted on Jan 15, 2008
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Posted on Jan 02, 2017
Tips for a great answer:
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Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
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