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Backlight flickering from dim to bright a couple times a second

Could this be caused by a bad coil inductor on the mainboard

Posted by Anonymous on

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Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.

Posted on Apr 28, 2015

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Contrast control pot defective

Posted on Apr 27, 2015

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Posted on Jan 02, 2017

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Upper sise of screen flickering problem


Technology b> A laptop's display assembly consists of an LCD panel, an inverter board and a backlight lamp. The inverter board supplies power to the lamp which lights up the LCD screen as it generates images. Light from the lamp is then uniformly distributed over the panel to create images. b> Cause b> Flickering is commonly caused by a damaged or malfunctioning inverter. Because a faulty inverter is not able to supply adequate power to the backlight lamp, the screen goes dim each time the backlight loses power. In some cases, flickering may also be caused by a faulty connection between the inverter and backlight lamp. Diagnosis b> Resolving a laptop screen's flickering problem entails correctly diagnosing the problem and replacing the faulty component. You may diagnose the problem by hooking up the laptop to an external display unit, such as a projector. If the external display has the same display problem as the laptop's LCD screen, it is indicative of a motherboard or video card problem. If the external unit displays bright, crisp images, the problem is probably caused by the backlight or inverter. b> Solution b> You may repair a laptop screen's flickering problem by replacing the inverter board or backlight. Order parts from a trusted supplier and replace the component by referring to your product documentation.
http://www.tech-faq.com/how-to-repair-a-laptop-screen.html http://www.laptop-repair.info/laptop_screen_repair.html b> Hope this helps.

Jan 21, 2013 | Lenovo IdeaPad S300 59359327 Silver Gray...

1 Answer

Samsung ln55c610nf flickers


Ok, if the back light is doing that one of a few possible reasons:

One: Backlight unit failing or bad.
Two: Voltage source to backlight failing or bad.
Three: Circuit in set that controls, triggers and turns that on is bad.

No magic wand here--but fairly straightforward : Check voltage,check on and control of same, if those good replace the Back Light unit.

99% of this is basic trouble shooting

Apr 11, 2012 | Samsung Televison & Video

1 Answer

I have picture ,but no sound


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the negative (upper usually) side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

Feb 23, 2011 | Sharp LC-26SH10U 26 in. LCD Television

1 Answer

No picture has sound,


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the negative (upper usually) side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

Jan 09, 2011 | Sharp LC-42D43U 42 in. LCD HDTV

1 Answer

Get sound but no picture


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the negative (upper usually) side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

Apr 01, 2010 | Sharp LC52SB55U LCD TV

1 Answer

No picture only sound


Test: You might see a pic by shining a bright light against the screen. (Halogen can burn a spot if too close for too long like 15 seconds). If so, you probably have an inverter, backlight tube or coil/driver board problem. Some of these units have a bad ground on the tube driver coil board which can be shimmed and/or tightened. Sometimes a simple car light tester (continuity tester with a 12v bulb) from casing/mount ground to any of the negative (upper usually) side of the backlight driver coils will light the screen and reveal if and which tube is non functional. I leave one dome light running in such ground position one of my TVs at all times for regulation and night dimming.

Dec 31, 2009 | Sharp LC-19SB15U LCD TV

2 Answers

Dell screen goes black , after 2 seconds but when low down the brightness it work good it not goes off , but it is very low brightness and difficult to read text some time ,


but when low down the brightness it work good it not goes off , but it is very low brightness and difficult to read text some time......WHAT?

Can you explain in a bit more detail please...I don't know what you mean by.........
'when low down the brightness it work good'?

But try holding down the FN key on your keyboard & tapping the 5fc1ca0.png Button that alters the brightness.

Sep 04, 2009 | Dell InspironTM 1501 Notebook

1 Answer

Blacklight on screen


you can set the backlight by going into the options on your blackberry and then screen/keyboard.
scroll to backlight brightness and click on it and set higher.
then go to backlight timer and click and scroll to whatever time.
exit using back button and save settings.

Good Luck

If this helps you please leave a vote in fixya

May 20, 2009 | RIM BlackBerry? Curve 8330 Cellular Phone

1 Answer

My laptop will, once in a while (every couple months), have3 "issues" with its brightness/contrast. If I leave the brightness alone, it will turn most of the screen red. If I lighten the brightness AND the...


You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:
  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display or appear black.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

May 14, 2009 | Gateway M320X Notebook

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