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No backlight no light

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Samsung monitor 2232bw plus backlight fade in black backgrounds scenes


Most common failures in these LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply C242 470uF 10V, C241 & C242 1000uF 16V, C261 & C319 680uF 35V failed as indicated in the attached picture, replace them at once.

If the power supply board is working then it is back light problem, first do a flash light test. If you can see the image in the flash light test, follow the steps how to test back light voltages: https://how-to-repair.org/repair/lg-tv-repair-manual-pdf/lg-led-tv-no-backlights-32ln5300-32ln5310-32ln5700-voltage-test-troub/2pyuXwNkBMA.html and follow the steps how to repair back light LEDs: https://www.youtube.com/watch?v=_poWTEihIJU Fix Led Backlights for TV or Monitor Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg... Fix Led Backlights for TV or Monitor
samsung-2033sw-2233sw-ip-43135a-bn4400124s-power-board-dfydxumns33ohqc3bsmt22yf-3-0.jpg

Nov 07, 2013 | Samsung SyncMaster 2233BW 22" LCD Monitor

1 Answer

Brightness buttons (f2 and f3 are not working


Not a lot to go on here, Prabhdeep

Need the full model information

Example,
Acer Aspire 5535-5050

Post back in a Comment, or Reply; at end of this solution

Primer:

An LCD screen does not produce light,

http://solutions.3m.com/wps/portal/3M/en_US/NA_Optical/Systems/BehindTheScenes/Optics101/

Click on the monitor icon

Because of this the LCD screen needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or more than one), or a series of LED's.
(Light Emitting Diode)

CCFL = Cold Cathode Fluorescent Lamp (Bulb)
Similar to Fluorescent lighting used in homes, and businesses; but on a MUCH smaller scale.
Average thickness is 2mm, or a little more than 1/16th of an Inch.
Or about the width of this capital letter -> O <-
Average length is almost as long, as the LCD screen is in height.

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

View the last 8 photos

(Do they break easily when trying to remove, and replace?
OH, YES!)

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.
If the laptop uses LED backlighting, it MAY or MAY NOT use a screen Inverter.
Generalized thinking (Can also be stated as 'Rule of Thumb'), is that if the laptop uses LED backlighting, it does NOT use a screen Inverter.

I also feel into this line of thinking, since none of the LED back-lit laptops seemed to use a screen Inverter; that came to the shop.
I have found this to be a fallacy from on here,......FixYa.....
I have looked up two laptops using LED backlighting, and discovered they also used a screen Inverter.

Now I post LED backlighting may, or may not use a screen Inverter.
Seems when LED backlighting first came out, a screen Inverter was used on some models.
Also seems as the LED backlighting technology progressed, no screen Inverter is used.

90 PERCENT of the time, the fault for bad Backlighting can be attributed to a bad screen Inverter.
Of course, this IS IF the laptop uses a screen Inverter.

For a laptop with LED backlighting that does not use a screen Inverter, and backlighting is bad (Dim, or non-existant), the next hardware part in the diagnoses to replace, is the LCD screen.

I now await the information I asked for above.
Then we can diagnose together.

Regards,
joecoolvette

May 09, 2013 | Computers & Internet

1 Answer

You can hold a flashlite to see the screen, i was told it might be the light bar or inverter can you plz tell me what the problem is before i spend to much money


Ok if you can see the image when you show a flashlight to it means that the backlight is not working, it could be a simple problem as the backlight power cable loose inside or in worst case the backlight completely damaged. Best to take it to a service center and they will be able to tell you what happened. Hopefully it's just a loose cable.As LCDs do not produce light themselves they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel.Backlights are used in small displays to increase readability in low light conditions.You can search for info on Backlight to learn more about it.

Jan 25, 2011 | Computers & Internet

1 Answer

I changed the batterys in my 1F78-151 thermostat and now the backlite does not work.....


• Display Backlight - (Not available on earlier models.) The display backlight improves display contrast in low lighting conditions. Selecting backlight ON will turn the light on for a short period of time after any button is pressed. Selecting backlight OFF (default) will keep the light off. Turn the display backlight feature ON as follows: 1. Press TIME and RUN buttons at the same time. The display will show "d-L" and "OFF" alternately

Dec 22, 2010 | Heating & Cooling

1 Answer

Can i shut off the back light and or dim the


To change the backlight setting:
1.Press Menu/Ok >Settings >Display >Light Control > Backlight Control.
2.Select how long the backlight should stay on.(If you
choose Flip Open ,the backlight stays on as long as the
phone is open.)
3.Press Menu/Ok .



Thank you for using Fixya

Oct 08, 2009 | Motorola Mobility ic502 Cellular Phone

1 Answer

Backlight does not light when receiving an email on the 8330


To turn on the automatic backlighting on a BlackBerry smartphone, complete the following steps:
  1. Click Options.
  2. Click Screen/Keyboard.
  3. Click Change Option in the Automatic Backlight field.
  4. Click On.
  5. Click Save from the Screen/Keyboard menu to turn on the automatic backlighting.

Aug 26, 2009 | RIM BlackBerry? Curve 8330 Cellular Phone

2 Answers

Backlight is off


You either have a bad LCD or bad backlight board. The backlight on your screen is no different than a light bulb. If it burn out it stops working, if these is no power to the backlight your screen will have an image but no backlight to see the image.

Jul 03, 2009 | Sony Cyber-shot DSC-T20 Digital Camera

4 Answers

My 1st gen ipod touch backlight doesn't turn on. I tried to turn my lightness up but still their is not light. the ipod works great though but the light doesnt work


i don't know if this will work for you. I had the same problem with mine and i read somewhere that u need to either blow really hard in the bottom where you connect the sync cable or use a can of compressed air and it will clear dust off the place where the brightness is hooked up to the motherboard. After blowing put iPod in sleep mode for about 5 minutes and then turn back on. If there is no light then go to settings>backlight and then make it go all the way up. Might Work

Jun 23, 2009 | Apple iPod touch

1 Answer

Back light on ibm t21


This is an known problem I think you must replace the backlight:
look for example ebay partnr: 260327530145
only for example if this is your problem.

PRODUCTS ITEMS

LCD CCFL BACKLIGHT LAMP IBM THINKPAD T20 T21 14.1" SCREEN

LAPTOP & MONITOR LCD SCREEN PROBLEMS

SOME COMMON SYMPTOMS FOR BACKLIGHT LAMP REPLACEMENT

- Flickering, red or pinkish hue to display and even total darkness. These symptoms are a result of a failed or ageing backlight or a failed, damaged. This is caused by the defective backlight lamp and all you need to do is replace the backlight.

DESCRIPTION

Our high brightness LCD cold cathode lamp (CCFL) with long life, it is more than 50000 hours, with Japanese new cathode, phosphor, glass, and other materials, they are perfect for all LCD backlight application and other purpose, such as instrumentation, medical devices, and all type devices.

COMPATIBLE MODELS
Suit for

Any 14.1” LCD Screen (2.0mm in diameter and 290mm Length) and (2.0mm in diameter and 292mm Length)

CUSTOMER SERVICE / CONTACT US

Email: mkproco@gmail.com (12 Hours Response Time)

Oct 14, 2008 | IBM ThinkPad T21 Notebook

1 Answer

No backlight


A couple things to try:

1st check the backlight settings

Turn on Backlighting and Control Brightness To use your device in dark environments, enable the automatic backlighting feature:
  1. From the Jump screen, press MENU t02003-15.gif then select Settings > Battery & Display.

  2. In the second group box, select the Turn on backlight when using device check box.

  3. Highlight, then select the Brightness slider to open it for editing. Roll the TRACKBALL right to increase brightness; roll the TRACKBALL left to decrease brightness. After you've made the adjustment, press the TRACKBALL to exit edit mode. t02007-55.jpg

  4. Select the length of time you want backlighting to stay on from the Turn off after pop-up menu.

  5. To use the device's light meter while the backlight is on, select the Use ambient light sensor check box.

  6. Press JUMP t02003-14.gif to return to the Jump screen and save your setting.
Now, when you press any button or key, or flip open the screen, backlighting will turn on for the set amount of time. Note that as long as you press a key or button before the set time elapses, the backlight will stay on.
Tips:
  • Even if you have not selected automatic backlighting, you can turn on backlighting at any time by pressing MENU t02003-15.gif + JUMP t02003-14.gif . The backlight will remain on for the time specified in the Backlight Turn off after pop-up menu.

  • When in key guard mode, you can turn on the backlight by pressing the RIGHT SHOULDER t02003-66.gif button.
If it still does not work, then you can try resetting the flex cable to the lcd.

Reseat the SidekickFlex cable

If that doesn't fix it then a new lcd assy will take care of the issue. they run about 45 dollars on ebay.

Sidekick LCD screens

Apr 26, 2008 | T-Mobile Sidekick® 3 Cellular Phone

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