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www.youtube.com/watch?v=Mmu5wq6LVgM
Jan 28, 2012 - Uploaded by DaReal2Face
Samsung TV half the screen goes black or dark. ... My samsung 40" - 14 months old does this on the top half of the screen. .. ****** 12 month ...
Most phones have a sensor at the top (near the speaker) that senses when you put it up to your face. Do not cover the top portion of the phone and you should get the screen back.
The light sensor is at the top of the device, first, make sure nothing is blocking this such as a sticker or external case or cover. If this is not the issue then try this (depending on model it might work).
From the Dialler application, enter *983*0# this should get you into the factory test menu (hopefully). Go all the way to the bottom for "Sensor" or Proximity. Press Calibrate to calibrate the proximity sensor. The proximity state (1 or 0) should change when you move your hand near to the top of the handset.
If you wish to get some details; visit the site linked here. Pull up older posts. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
If you wish to get some details; visit the site linked here. Pull up older posts. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
The back light is the whole of the screen, the screen is illuminated by a CCFL lamp (fluro tube) on the bottom of the screen. A inverter supplies high voltage to this CCFL lamp. If
your laptop appears to boot up and the hard disk LED flashes, then the
problem is probably a back light fault. This can be a faulty inverter or a
faulty CCFL lamp. Please click on this link and follow my instructions
to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
Either the power supply board is failing and needs repair or a bad bulb in the screen is causing it. You would have to open it up to get a better idea.
Here's some info:
MAKE
SURE ALL POWER is DISCONNECTED For at least 5 minutes PRIOR TO WORKING ON
inverters. If your picture wasn't
pinkish or dark at the top or bottom when it was working, then it may be the
inverter has gone bad. Inverters are like light bulbs and have life
expectancies on the capacitors. If your picture was
pinkish or dark at the top or bottom when it was working then you may have 1 or
more of the bulbs failing. You can check for
pinkish if your screen flashes.
What you do is when you have it open to the point of getting to the wires that
hook to the back of the lcd screen is to disconnect only the wide ribbon that
goes from the video board to the back of the screen. Then start it and check
the screen flash color.
These come apart a little different than most. The front trim comes off with
the screen. So essentially you are removing the back case first:
Once the four screws are out of the rear corners there are snap tabs that need
to be released between the silver trim and the back black plastic (three top
and bottom and two on left and right.)
You can use a thin knife blade to help release them as you separate the silver
from the back plastic Black part has to be bent outwards to release these tabs.
Then entire guts will come out with the screen ., then the inverter is under
the center area under the metal cover.
Shout if you need more info.
If you email me a good picture of the inverter in the area of the larger yellow
square component and one from underneath , behind the two small yellow square
components, I may be able to get a better idea if it is the inverter from a
visual. Email : [email protected]
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