Question about Dell Vostro 3400 Laptop Computer (Intel CORE I5 320GB4GB) (BQMC4F64) PC Desktop

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Replace backlight, inverter or video cable - Dell Vostro 3400 Laptop Computer (Intel CORE I5 320GB4GB) (BQMC4F64) PC Desktop

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Posted on Oct 10, 2013

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How to replace inverter boards


Carefully lift up the FL inverter and rotate it a little bit. Unplug cables on both sides. The left side of the inverter board connects to the video cable, the right side to the backlight bulb (CCFL tube) inside the LCD screen. Remove the inverter and replace it with a new one

Sep 11, 2015 | Televison & Video

2 Answers

How to fix my screen?


check and make sure your video card is seated properly if it is my best guess without doing any testing is that your video graphic card is broken

Jan 08, 2015 | Samsung 700Z COREI7-2675 15.6 8GB 750GB...

1 Answer

Laptop screen becomes black after 1 second


You have to diagnose the problem.......


Right off hand I would say the screen Inverter is bad, but this is just guessing......

Why?
Because your laptop may not use a screen Inverter.
It may use LED's as backlighting.


Or, it may have a pinched/damaged video cable.......


Primer:
An LCD screen cannot produce light. It 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)


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


Average thickness is 2mm. That is a little larger 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.


A screen Inverter is used to convert the power, (Electricity), of the laptop; for the LCD screen, and the Backlight.


A laptop that uses a CCFL, (Or more than one), uses a screen Inverter.
A laptop that uses LED backlighting, May or May Not use a screen Inverter.


Seems when the LED backlighting technology first came out, a few laptop models Did use a screen Inverter.
As the LED backlighting technology evolved, a screen Inverter was no longer used.

Average example of a screen Inverter,

http://www.amazon.com/Screen-Inverter-HP-Pavilion-DV6000/dp/B0058TMLLY

The LCD screen is in the Display Assembly.
The plastic frame in front of the LCD screen, is the Display Bezel.
(Different manufacturers use different terms. The above is for HP, and Compaq laptops)

Display Bezel removed, the screen Inverter is located at the bottom of the LCD screen.
That is IF, the laptop uses a screen Inverter.
If the Backlight is bad on a laptop that uses LED backlighting, the LCD screen itself is replaced.
The LED backlighting is built-in.

The Video Cable, (Display Cable, etc), connects to the motherboard, usually under an area under the Keyboard, or just above it. Some models have the Video Cable connecting to the Bottom of the motherboard, and at the back.

Average example of a Video Cable,

http://www.amazon.com/Video-HP-Pavilion-DV6000-FOXDDAT8ALC0041A/dp/B003YDLDBK

The Video Cable then routes through Channels, and Latches; and comes up around the left Hinge.
It then goes on to up into the Display Assembly.

Depending on the technology used, (screen Inverter, or no), the Video Cable splits off, and connects to the screen Inverter.
The rest of the Video Cable then connects to the back, of the LCD screen.

Due to just normal opening, and closing of the laptop; the Video Cable may become pinched, and/or pulled on.

This can cause the connection at the motherboard to become loose, and/or at the screen Inverter, (IF used), and/or at the back of the LCD screen.

It may also cause damage to the Video Cable. (Stretched/Broken)

Point?

1) May be just a loose connection/s of the Video Cable
2) May be a damaged Video Cable
3) May be a bad screen Inverter
4) May be a bad LCD screen.

Post in a Comment, as to the laptop manufacturer name, and model number.

This way I can step by step you through diagnosing the problem, for YOUR laptop; and not post a bunch of generic information.

HOWEVER, it does depend on if the information is available on the internet. Such as a free Service Manual, and/or pictorial guides.

I CAN guide you even if there is not, but if there is; it just makes it simpler for you.

I can tell you it is easy. Once you have performed this procedure, you may want to do it for a friend, or relative; if the situation arises.

Regards,
joecoolvette

http://www.insidemylaptop.com/

Jul 09, 2013 | Computers & Internet

1 Answer

Why is my replaced lcd screen not lighting up?


1) Wrong LCD screen

2) Video Cable (LCD Cable) is not connected tightly.
Motherboard side, or LCD screen side; or both.

3) IF, a screen Inverter is used, the small cable from the Video Cable, that connects to the screen Inverter; is not connected, or has a loose connection to it. (screen Inverter)

4) An LCD screen, and a screen Inverter are a Matched unit.
If it's the wrong LCD screen......................?

5) IF, a screen Inverter is used; the diagnosis was wrong, and the LCD screen was replaced.
90 PERCENT of the time, the fault is a bad screen Inverter.

A) Laptop's LCD screen uses a CCFL, (Or more than one), for a Backlight; the laptop uses a screen Inverter.

Diagnostic flowchart leads from Graphics Chipset, to Video Cable, to screen Inverter, THEN, LCD screen.
Expensive LCD screen was replaced, instead of the actual part that needed replacing;
Video Cable: $9 to $22
Screen Inverter: $9 to $22

LCD screen: $60 to $245

B) Laptop's LCD screen uses LED backlighting, and does NOT use a screen Inverter:

Diagnostic flowchart is;
A) Video Cable;
A Video Cable should have it's connections PHYSICALLY checked.
You have to try to push the connectors in tighter.
Visual inspection alone will NOT do.

Making sure the Video Cable connections are tight, and this does not fix the problem, then the Video Cable needs to be removed; and every wire in the Video Cable checked for Continuity with a multimeter set to OHM's. (1K)

Not feasible, then take the Video Cable down to the nearest small computer shop; and have the resident tech check it for Continuity.
Should only be a few bucks.

Or just replace the Video Cable.
(Parts changing I know, but...........?)

Primer:
An LCD screen cannot produce light. It 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)

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

Average thickness is 2mm. That is a little large than 1/16th of an Inch.
Average thickness is almost as long, as the LCD screen is in height.
View the last 8 photos,

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

A screen Inverter is used to convert the power, (Electricity), from the laptop; for the LCD screen, and Backlight.

As previously stated, Backlighting that uses CCFL, uses a screen Inverter.
LED backlighting MAY, or MAY NOT use a screen Inverter.
When the LED backlight technology first came out, it seems some did use a screen Inverter.
It also seems as the technology advanced, LED backlighting does Not use a screen Inverter.

Regards,
joecoolvette

May 14, 2013 | Sony Computers & Internet

1 Answer

Pink screen


Problem can be;

1) Graphics chipset
2) Video Cable
3) screen Inverter (IF Used)
4) LCD screen

Diagnose to find out.
I need the laptop manufacturer name, and model number.
Model number can be found on the Bottom of the laptop.

Post back in a Comment.

A) Graphics chipset:

An external monitor is used to check, and see if the display is also pinkish on it; or it is OK. Info posted I need, I will detail this procedure out step by step.

Display good on external monitor means graphics chipset is OK.
(Mounting is usually the problem)
Means problem is screen Inverter (IF used), or Video Cable, or LCD screen.

B) Video Cable:

The Video Cable connects to the motherboard, in an area under the Keyboard, or under the Switch Cover.
(Depending on laptop design, Switch Cover may be an integral part of Palm Rest Cover)

From there it leads under, or close by the left Hinge; and then goes up into the Display Assembly.

IF, a screen Inverter is used, the Video Cable has a separate small cable that branches off; and connects to one side of the screen Inverter.
The main part of the Video Cable connects to the back of the LCD screen.

Just due to normal repeated opening, and closing of the laptop; the Video Cable may become pulled on, and/or pinched.
This can lead to a loose connection at the motherboard side, or LCD screen side. (and/or screen Inverter, IF screen Inverter is used)

Can also lead to a damaged Video Cable. (Stretched/Broken wires inside it)
This can cause a pinkish screen.

C) screen Inverter:

With Backlighting that uses CCFL/s for a Backlight, a screen Inverter is used.
(Cold Cathode Fluorescent Lamp)

For Backlighting that is LED, a screen Inverter MAY, or MAY NOT be used.
(First design LED backlighting seemed to. Later design LED backlighting, does not. Light Emitting Diode)

A screen Inverter is used to convert the power (Electricity), from the laptop; for the LCD screen and Backlight.
Screen Inverter going out, can cause a pinkish screen.

D) LCD screen:
Graphics chipset is good, Video Cable connections are good; no damaged Video Cable, screen Inverter is good (IF used); problem is LCD screen.

Awaiting manufacturer name, and model number.

Regards,
joecoolvette

Apr 30, 2013 | Computers & Internet

1 Answer

My screen is staic when i open my lap top do i have a virus


Naa!

Hardware problem with the laptop.

Loose connection of Video Cable TO motherboard, and/or loose connection of Video Cable TO the back of the LCD screen.
If there is obvious signs of damage to the sheath of the Video Cable, suspect damage to the tiny wires inside, also.

After PHYSICALLY checking the connections of the Video Cable, and this proves no result, the Video Cable is to be removed; and checked for continuity. (Multimeter set to OHM's. {1K} Check every wire)
Or take it to the nearest small computer shop, and ask them to check it. (Few bucks)

You HAVE to rule out the Video Cable, before going on with the diagnoses.

Video Cable connections check out, Video Cable continuity test performed, or Video Cable replaced; the next hardware component to check is the screen Inverter.

Laptops that use a CCFL, (Or two of them), for Backlighting; use a screen Inverter.
Laptops that use a series of LED's for Backlighting; do not use a screen Inverter.

For laptops with LED backlighting the next step is to replace the LCD screen.

For laptops that use a CCFL/s for backlighting, the next step is to check the screen Inverter.

Problem is to check a screen Inverter, requires a sensitive multimeter. Read fairly expensive,

http://www.fonerbooks.com/test.htm

Those without access to one generally just replace the screen Inverter; due to ease of access to it, and low cost.

Average price seems to be $12 to $20. Now watch me hit that ONE laptop out there that costs more! lol!
It's located behind the Display Bezel, and mounted towards the bottom of the LCD screen.

(Display Bezel; thin plastic frame in front of the LCD screen)

If you post the Product Number of the laptop, I can give you links to the Service Manual, (HP Support - Free), and maybe a pictorial disassembly guide, for the areas you need.

This is in a white Service Tag on the bottom of the laptop.
P/N = Product Number

(Not S/N. Do NOT post a Serial Number on a world wide public forum)

For additional questions please post in a Comment.
Regards,
joecoolvette

Nov 24, 2012 | Compaq Computers & Internet

2 Answers

Back light sometimes works


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

Nov 10, 2012 | Acer Aspire As5250-0327 320gb - Perfect...

1 Answer

White screen but plugin monitor works. is it the screen?


http://support.acer.com/acerpanam/notebook/0000/Acer/Aspire5100/Aspire5100sp2.shtml

http://www.laptopscreen.com/English/model/Acer/ASPIRE~5100/

So you PHYSICALLY checked the connection of the Video Cable, TO the motherboard, TO the screen Inverter, and TO the back of the LCD screen?

Visual inspection will NOT do. If either motherboard connector, or LCD screen connector is loose, the width of this letter -> I < you won't see it, and it will affect the video signal.

The Video Cable connects to the motherboard under the Middle Cover, above the F4 and F5 key on the Keyboard. (Left edge of F4 key over to middle of F5 key)

[Middle Cover is Acer speak for Switch Cover. The cover strip above the Keyboard, and below the LCD screen ]

aspire-3100-5100-5600-lcd-cable-dc020007o00-.html
http://www.laptops-we-r.com/prestashop/aspire-5100-parts/109-acer-


Click on the view to enlarge. Top left side connects to the LCD screen. Rectangular Black connector with thick round cable, at the bottom, connects to the motherboard. Small cable coming off at the bottom, connects to the screen Inverter ]

From the motherboard connector the Video Cable routes up under the left Hinge, and into the Display Assembly. It then connects to the screen Inverter, and LCD screen.

From normal opening, and closing of the laptop, repeatedly, the Video Cable may become pinched.
This can lead to loose connections.

It can also lead to damage of the Video Cable.
If the sheath of the cable shows apparent signs of damage, the tiny wires inside may be damaged also.
Stretched/Broken

This means to ENSURE that the Video Cable is NOT the problem, a continuity test needs to be performed on all of the Video Cable's wires. (OHMS)
If an economical multimeter ($5 to $12) is not available, suggestion is to take it down to the nearest 'Mom and Pop' computer store, and have them check it. Labor charge should only be a few bucks.

Video Cable checks out it's on to the screen Inverter, for the diagnoses.

[NOTE*
This diagnoses is for an Acer Aspire 5100 Notebook PC. Uses a single (1) CCFL for a Backlight, and has a screen Inverter. Laptops that use LED's for a Backlight generally do not use a screen Inverter]

Did you test the screen Inverter, or replace it?

http://www.amazon.com/Acer-Aspire-5100-Inverter-PK070005U00/dp/B005F1N5O2

http://www.fonerbooks.com/test.htm

NOTE*
Takes a sensitive multimeter. Read fairly expensive.

Primer;

An LCD screen cannot produce light by itself,

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

Click on the monitor. Suggest start out with your audio turned down ]

It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)
The Acer Aspire 5100 Notebook PC uses a single (1) CCFL.

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

[Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
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/ ]

A screen Inverter is used to convert the power (Electricity) from the laptop, for the LCD screen, and Backlight.

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Primer over.

If the screen Inverter is good, the LCD screen is bad.
Replace.

[The LCD screen, and the screen Inverter are a MATCHED unit.
When purchasing make sure you get the correct screen Inverter, or LCD screen ]

For additional questions please post in a Comment.

Regards,
joecoolvette

Sep 09, 2012 | Acer Aspire 5100 Notebook

1 Answer

I have a dell 1525 laptop - I replaced the inverter, I replaced LCD the new LCD also had an inverter and I replaced the video card. I still get a faint dark screen. I can hear the music when Winn 7 boots...


Hello, and thanks for using FixYa.

What do you mean you replaced the video card? that is impossible, you would have had to replace the whole mainboard.


Okay you replaced the inverter, I suppose it was a tested and known good condition working inverter? does it work on another machine?

The lcd display, same with inverter? Has it been tested that its backlights work properly?

Then aslong as the small cable between mainboard and inverterboard is connected properly, it should work. But if it does not you have 3 possible causes.


1, Faulty display backlights
2, Faulty inverter board
3, bad cable / inserted wrong or motherboard is not providing the required electricity to the inverterboard.

Oct 16, 2010 | Computers & Internet

1 Answer

Acer travelmate 2410


This doesn't necessarily rule out the inverter. I've had inverters with intermittent problems that had the same effect, so having the inverter tested is the only way to rule it out. Other possibilities are a bad connection, a corroded/dirty pin or socket in a connector, a bad ribbon/cable, and a failing backlight. If it is a failing backlight, the entire screen will need replaced, as the screen is considered a sealed unit and the backlight isn't available and not considered a replaceable item. Also, it's rare, but it could have a faulty motherboard component or video card. I'm leaning towards a faulty backlight, but keep in mind the inverter and cable possibility. Start by checking and cleaning all connections.

Sep 17, 2008 | Acer TravelMate 2300 Notebook

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