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Lcd inverter replaced but still no backlight

The most common parts to go out are the backlight itself, and the cables. If possible, remove the cables from the laptop, and check for continuity with a digital multimeter (DMM). If you are getting a good connection it is the backlight. If you don't get a good connection, the cables are the problem.

Jun 19, 2012 | Computers & Internet


Troubleshooting Laptop Power Failures - Faint Image on Screen


I can only see a very, very faint image of my operating system desktop on the screen.

Diagnosis & Solution

In such cases, the first thing to do is to plug in an external monitor and see if you could get a good image on it. If you get a good image on the external monitor, then this means that the video system is working, but the LCD isn't getting any backlighting. This could be due to either a failing backlight lamp or a failing inverter. The usual culprit is the inverter, especially if you didn't note any strange tinting to the laptop display in recent operation.

The traditional method used by technicians to test inverters is to connect it to a known good backlight lamp of the proper type, and test to see if the inverter could power up the backlight lamp or not. You could also test the inverter by connecting it to a good laptop screen that you might have salvaged from a dead laptop. If the inverter lights up the screen, then the inverter board is good and you are left with a bad backlight lamp as the cause of the problem. Otherwise, it is the inverter which is bad & needs to be replaced.

An alternate method to test the inverter is if you have access to a good quality RMS multi-meter, one that can measure frequency to 50 MHz or 100 MHz, you should be able to get a reading on a functioning inverter without even taking the lid apart. The inverter is normally located below the LCD in models with narrow borders, or to the side if there's an inch or so of plastic bezel on each side of the LCD. By scanning with the multi-meter probes over the plastic along the edge of the screen, you should pick up a strong signal somewhere between 30 KHz and 70 KHz if the inverter is live. If you can't pick up the signal but want to be sure, remove the plastic bezel from around the screen and measure right on the two insulated wires leading to the backlight. If the inverter is functioning, the meter will pick up the signal right through the insulation, since the inverter is putting out a low radio frequency signal.

Most of the time, a bad backlight lamp means that the whole LCD screen needs to be replaced.

Please Vote for this Tip if you found it helpful.
M. Omran

on Oct 16, 2010 | Acer Aspire 3680 Laptop

1 Answer

My averatec laptop will only power on to a black screen but it still sounds like its booting

1) Laptop on use a flashlight, and shine it at the LCD screen. Shine at various angles.
Do you see faint images?

2) You can also plug in a VGA monitor to the back of the laptop, (Laptop OFF, monitor off), and toggle over.

(It can be a VGA monitor that looks like a small TV {CRT}, or an LCD flat screen that has a VGA cable attached)

Plug the VGA monitor's cable into the blue VGA port on the left side, of the Avertec 3200 Notebook PC.
(Example of VGA connectors,

Turn the VGA monitor on. Give it time to 'come to life'.
Turn the laptop on.

Are there graphics on the external monitor? If not press, and hold down on the Fn key, (Blue Fn next to the CTRL key), then tap the F2 key.

(The F2 key is the toggle over key for an external monitor. You can use the laptops LCD screen, or it's screen, and an external monitor)

Graphics show on the external monitor? Your graphics chip is good.

Problem is with the screen Inverter, or the Backlight.

An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

A screen Inverter is used to convert the electricity from the laptop, for the LCD screen, and the Backlight.

90 percent of the time the fault is the screen Inverter.

The Display Assembly essentially is;

1) Top cover of the laptop. (Display Cover)
2) LCD screen
3) Display Bezel. (Thin plastic frame in front of the LCD screen, and surrounds the LCD screen)
4) Inverter
5) Backlight
6) LCD screen frame

With the Display Bezel removed, the screen Inverter should be at the bottom/front.

This is an example of a screen Inverter for an Averatec 3200 from a quick search,

I haven't worked on an Averatec 3200 Notebook PC before. I have worked on 100's of other laptops.
The sequence for removing the Display Bezel follows a pretty standard approach.

Looking at the Display Bezel I see four screw covers. (I'm looking at a PDF Users Guide)

One at the top Right corner, one at the top Left corner, one at the bottom Left corner, and one at the bottom Right corner.

These screw covers made of a rubber-like material. (Synthetic rubber) They are slightly rounded on the top. They have a type of rubber cement that holds them in place.

I use a computer pick to gently pry them off. If you carefully pry each screw cover off, and set them down sticky side up, (Screw side), you can usually reuse them again.

Screw covers (4) removed, use a Philips head screwdriver, and remove all 4 screws.

The Display Bezel will still be held in place. It has plastic tabs on the outside edges that snap into the Display Cover. (Top cover of laptop)

A fingertip is used on the INSIDE edge of the Display Bezel, next to the LCD screen.
(WATCH your fingernails against the LCD screen)

The fingertip raises the Middle/Inside edge of the Display Bezel, just slightly.
Now use another fingertip on the opposite side. Raise the Middle/Inside edge.

The Display bezel should start 'popping' out. (As the plastic tabs release they make a popping, or snapping sound)

To illustrate this technique further,

(One more, to show you where I believe the screen Inverter is for the Averatec 3200 Notebook PC, and what an average screen Inverter circuit board looks like,

When the Display Bezel is loose, you slide it to one side a little to ease it around, and off, of the cover latch.

The cable connectors going to the screen Inverter are shaped differently from each other, so that when you go to reinstall them, there is no chance of mixing them up.

With the tools you have available, I would replace the screen Inverter ($7 plus shipping), and see if this repairs the problem.

If not the problem is the Backlight. Most of the time you have to buy the LCD screen, as the Backlight is an integral part of it, and should be replaced by a professional.

[ An LCD screen is composed of layers. The layers are held together in the correct alignment by the LCD screen frame.
This alignment MUST be aligned as it was from the factory.

This gives you an example of replacing a Backlight,

Make a mistake here, and you can throw your LCD screen in the trash ]

For additional questions please post in a Comment.


Aug 21, 2011 | Averatec 3200 Notebook

1 Answer

Toshiba tecra a2 screen backlight problem the is screen not lighting up at all but in bright daylight fully functioning screen can be seen could this be the lcd inverter and how difficult is it to replace

screen not lighting up is either the screen inverter or a broken tube inside the screen. Tubes don't break by themselves so a dim screen usually comes after a transport or a drop. I would replace the inverter first (just cause it's easy and cheap). eBay's a good source for inverters and screens and you ought not pay more than $5 for a used inverter and anything more than $30 for a used screeen would be considered tourist price. Tecra A2's are rare, but it's the same as the more popular Satellite A55's. Its screen should be a 15" XGA and would be the same screen as many other Toshiba Satellite models (A10, A15, A40, A45, A55) and Satellite Pro models (M10, M15), to name a few.

In my opinion, dim screens are 98% broken tubes and 2% inverters.

Jul 29, 2011 | Toshiba Tecra A2-S336 Notebook

1 Answer

Toughbook is on but screen is black

Ok that means your lcd inverter has went bad or the backlight ,,but usally the lcd inverter,,can find both on ebay,,cheap uaslly,, but the inverter probly your problem ,,definetly would start there,,easiest fix,,find you a lcd inverter,,,,ebay or internet,,when u get it,,take bezel off lcd ,,the front cover with screw driver,,be easy ,,take ur time ,,once off ,,in the middle of lcd @ bottom theres lcd inverter for new one ,,turn on and check b4 u put bezel back ,,on,,should be good to go,,if that doesnt fix,,backlight bad,,easy to find also,,goodluck,,

Nov 20, 2010 | Panasonic Toughbook 28 Notebook

1 Answer

Sreen goes blank within minute, in windows or even if just in the cmos or setup. The video out when hooking up to another monitor is just fine.

You might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Sep 13, 2010 | Averatec 3200 Notebook

1 Answer

My laptop illumination backlite it turn off after one minute but computer still working.

This is common when the inverter (powers the backlight) begins failing. Either the board in the monitor or the cable that powers it.
Remove the 4-6 screws in the monitor bezel (surronds the screen) and directly below is a small board.
Looks similar to;

Enter the model number of your computer in ebay and it will provide you with the part.

This is the most common cause, but the wire may be broken. Wiggle the wire while it is on and see if it flickers.

Jan 24, 2010 | Averatec 3200 Notebook

1 Answer

My screen flickers

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 for parts, repair service and DIY info.

May 08, 2009 | Sony VAIO VGN-C140G/B Notebook

1 Answer

Want to replace Averatec 3200 Laptop Screen

Do you know for sure the LCD screen and not the video card is faulty?
You may find it cheaper to repair the LCD screen than replacing it.

Connect an external monitor to the laptop and power it up, if you see a clear image on an external monitor, this means your video card is OK.

If you see a dim image or flicking image on the LCD screen it means you have a backlight problem.

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 for parts, repair service and DIY info.

Mar 16, 2009 | Averatec 3200 Notebook

1 Answer

Black LCD

Sounds like you have a bad backlight, the backlight shines light through the translucent LCD layers to give you your picture in the same way you hold slides up to the light

Oct 08, 2007 | Averatec 3200 Notebook

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