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I need to check the monitor on my laptop to see if the connection to the motherboard is loose or if the inverter is bad.

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Hi,
It can be hard to figure out a laptop monitor fault. Some laptops will give beep codes if the likes of the connection has become loose/failing. If the invert is gone and the laptop is booting ok you can sometimes see the desktop on the screen if you look very closely.If you can't it could be the bulb in the screen that has failed.
If your up for ti you could try testing the inverter. http://www.fonerbooks.com/test.htm

Posted on Sep 27, 2010

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Laptop


No blinking cursor either?

{ If there is a blinking cursor, you would then use the Restoration Disk, IF you have it.
When asked choose Repair. (Non-Destructive Installation)
If you do not have it go to HP Support Worldwide, your country, and obtain the disk. (HP bought out Compaq. On the HP Support page for your country, go to the Top Right, click on the - Connect with HP - icon.

When you hover your mouse cursor over it, Connect with HP will briefly show)
The disk is free. The shipping and handling is not.
USA example: $17 for a 5 to 7 day ship, $24 for a 2 to 3 day ship. Call 1-800-474-6836. 24hrs a day, 7 days a week.

Have your Serial Number handy, to give to the nice representative on the phone. Bottom of the laptop in white Service Tag. S/N = Serial Number }

However no blinking cursor was stated. This means to me that it is a graphics problem.

The problem can be;
1) Graphics chipset
2) Video Cable. (Compaq/HP = Display Cable)

3) Screen Inverter. (IF used. Model Name and Model Number was not stated. This is the Product Number. P/N in white Service Tag, on bottom of laptop.

GENERALLY, if a CCFL is used for a Backlight, a screen Inverter is used. (Cold Cathode Fluorescent Lamp)

IF LED backlighting is used, GENERALLY NO screen Inverter is used. (Light Emitting Diode)
Does depend on what model we are talking about here.
There are some models that have used a screen Inverter, along with LED Backlighting.

4) LCD screen

A) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA connector, on the laptop.
Usually on one of the sides, or back.
Here is a general example of a VGA connector (port), and a VGA Cable,

http://en.wikipedia.org/wiki/VGA_Connector

Scroll down a little for VGA Cable example.

You can use a CRT type of monitor (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable. (You can also use a VGA to DVI adapter, if the laptop has a DVI port on it,

http://en.wikipedia.org/wiki/Digital_Visual_Interface

You can click on any photo to enlarge. Sometimes you can enlarge twice )

B) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings, the display should show on the external VGA monitor.
IF not;

You have at least 3 display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

Hold the Fn key down, and at the SAME time tap once on the F4 key. The F4 key is the Display Toggle-Over key.

Still no display on external VGA monitor?
Hold the Fn key down again, and tap once more on the F4 key.

NO display on external VGA monitor, means a problem with the graphics chipset.
Most of the time it is the MOUNTING of the graphics chipset TO motherboard.

The solder connections is the problem. Graphics chipset is reflowed to the motherboard, using an SMD/BGA Rework Station. Specialized shops have them.

Otherwise it means replacing the motherboard.

Good graphics on external VGA monitor means the problem is;
1) Video Cable
2) Screen Inverter (IF USED)
3) LCD screen

A Video Cable cost ranges from $9 to $22, with $9 being the norm.
It also just may have a loose connection. Loose at the motherboard side, or LCD screen side. May be screen Inverter cable connection, from Video Cable; is also loose.

So, you are looking at perhaps a loose connection of Video Cable.
Or a damaged Video Cable. (Replace then)

Problem may be the screen Inverter. (IF used)
They range from $9 to $22 also. (Again, $9 being the norm, or less)

LCD screen ranges from $60 to $245.
Just depends on what Compaq laptop it is.

Point?
Better to diagnose.
May find loose Video Cable connection, or bad Video Cable.
May find bad screen Inverter, if Video Cable is not the problem.

Some people jump the diagnostic flowchart, wind up spending $60 to $245 for an LCD screen, ONLY to find the problem was a $9 Video Cable, or FREE if the connection was loose.

Wish I could guide you from here. I step by step guide people, and this means replacing a motherboard in a laptop, if needed.
I have over 10,000 solutions, and many of them are for laptop repair. According to feedback from the asker's of the problems, I seem to have a very high ratio of accomplishment at this, because they repaired their problem/s.
(Brag, brag, lol!)

However it would seem a recent site development change, has rendered replies back from the problem asker, USELESS.
Haven't had a reply in two weeks, or more.
(Neither have the Top Experts)

Regards,
joecoolvette

May 20, 2013 | Compaq Computers & Internet

1 Answer

What could be the problem of my laptop,after start up a few minute the screen will become full white,the antivirus already expired


Nothing to do with a virus........

Not software related.
It is hardware related.

Problem can be;
A) Graphics chipset on the motherboard
B) Video Cable. (Also known as LCD Cable, and a few other monikers)
C) screen Inverter
D) LCD screen

The method to find what the problem is, is to Diagnose.......

1) Graphics chipset:

Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port, on BACK of the laptop.

http://www.finalsense.com/news/it/notebook_pocketpc/benq_joybook_a53.htm

(Pretty sad when you go to BenQ's 'support website'.
Couldn't pull a frigging photo up of the Joybook A53, and no User Manual download.
Sure isn't a laptop manufacturer that I would recommend!)

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA Cable.

VGA connector (Port), and VGA Cable example,

http://en.wikipedia.org/wiki/VGA_Connector

Scroll down a little for VGA Cable example.

Turn the monitor on. If a CRT type allow it to warm up a little.
Turn the laptop on.
By factory default settings, the display should show on the external VGA monitor.
IF not;

There are at least 3 display options available;
A) Internal monitor of laptop ONLY
B) Internal monitor of laptop AND external VGA monitor
C) External VGA monitor ONLY

Hold the Fn key down, and at the SAME time tap once on the Display Toggle-Over key.

Which key is that? Dunno. Thank BenQ for all of the detailed, wonderful information.........NOT.
It will be one of the F keys at the top of the Keyboard.
F1 through F12.
Usually has a monitor icon on it, and perhaps an arrow on one side.
HP is F4.
Acer usually F5
Toshiba - F8
IBM/Lenovo - F7

Just some examples.

No display showing?
Hold the Fn key down again, and tap once more on the Display Toggle-Over key.

No display on external VGA monitor suggests problem with graphics chipset.

(Most of the time it isn't the chipset itself, but rather it is the MOUNTING of the graphics chipset TO the motherboard.
The graphics chipset is soldered to the motherboard, with a BGA surface mount. Ball Grid Array.
Someone states it has a graphics card? Just laugh, and walk away. No reason to subject yourself to ignorance ]

Display shows on external VGA monitor?
The problem is the Video Cable, or screen Inverter, or LCD screen.

2) Video Cable:

The Video Cable connects to the motherboard, in an area under the Keyboard, or Switch Cover.
[Switch Cover;
The strip of plastic above the Keyboard, and below the Display Assembly.
Has the Power On button in it, for one]

From there the Video Cable goes by the left Hinge, and up into the Display Assembly.
One single cable comes off of the main body, of the Video Cable; and connects to one side of the screen Inverter.
The rest of the Video Cable, or Main body, goes on to connect to the back of the LCD screen.

Just from normal repeated opening, and closing of the laptop; the Video Cable may be pulled on. This chance also increases as the laptop ages. The sheath of the Video Cable, and the insulation on the wires inside the Video Cable; get stiff from age.

(Laptop is 5 years old, right?)

The pulling can cause loose connections of the Video Cable.
Loose on the motherboard side, or single cable connection to screen Inverter loose; or Video Cable connection to back of LCD screen, loose.

ALL power removed, AC adapter (Charger), and Battery; the connections are checked for tightness.
A visual inspection alone will NOT do.
The Video Cable connection MUST be physically checked.
Physically try to plug in tighter.
The loose connection could be so small, that you will not detect it with the human eye.

Pulling on the Video Cable can also damage it.
Stretched/Broken wires inside the Video Cable.
If, after the connections are proved to be tight, and this does not repair the problem; the Video Cable is removed, and every wire inside the Video Cable checked for Continuity.

A multimeter is used, and set to OHM's. (1K)
If this is not feasible for you, suggest take Video Cable down to nearest small computer repair shop, and have the resident tech check it out. Should only be a few bucks.

Video Cable continuity test proves Video Cable to be good, the screen Inverter is next in the diagnosis.

3) screen Inverter:
The screen Inverter converts the power (Electricity), from the laptop; for the Backlight, and LCD screen.
I know your laptop uses a screen Inverter, because it uses a CCFL for a Backlight,

https://www.laptopscreen.com/English/model/BenQ/JOYBOOK~A53/

90 PERCENT of the time, the fault can be attributed to a bad screen Inverter.
It is just a small circuit board, and only lasts so long.
HOWEVER, this is a diagnosis, and NOT a guessing game.

To test a screen Inverter requires a sensitive multimeter. Read fairly expensive,

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

The screen Inverter is located behind the Display Bezel, and mounted towards the bottom of the LCD Screen Frame.

[The plastic thin frame in front of the LCD screen, is the Display Bezel.
The LCD screen is composed of layers. These layers are kept in the factory set alignment, by a metal Screen Frame.
It resembles a picture frame ]

Because of the ease of access to replace, not having access to a sensitive multimeter, and the usually low cost; the screen Inverter is just replaced.

4) LCD screen:

If the Video Cable connections were tight, and Video Cable is good, plus the screen Inverter is replaced, and this does no good; then replace the LCD screen.

Video Cable cost?
Guessing around $9 to $12.
Screen Inverter?
Usually $9 to $20.
LCD screen?
$60 to $225 depending on laptop.

This is why the laptop is diagnosed.
Don't want to spend $225, when a $9 Video Cable, or $9 screen Inverter was the problem.

There is one tool you will DEFINITELY need, for checking the motherboard connection of the Video Cable, along with the basic tools.......

An ESD wrist strap......

Electro Static Discharge
Average cost is $3 to $6.
Connect it's alligator clip to a good ground source.

Need help in disassembling laptop to check motherboard connection, and LCD screen/screen Inverter connection of Video Cable?
Post back in a Comment, or click on Reply at end of solution.

There are no Service Manuals available. (BenQ, remember?)
However I am confidant I can guide you in this endeavor.
9 years at performing this online, (4 here), and over 10,000 solutions on this website. A LOT of them deal with this problem.

Regards,
joecoolvette

[Just to show you basics, here is an online computer repair tech I respect,

http://www.youtube.com/watch?v=Zo8ifRRezsU

May 13, 2013 | BenQ Joybook A53 Notebook

1 Answer

I can only see half of my screen


I suggest you have a bad LCD screen.

HOWEVER the procedure is to diagnose, and not spend money foolishly.

I need to know the laptop manufacturer name, and model number.
I cannot for the life of me believe FixYa would not ask for this, as a general requirement.

The model number is on the Bottom of the laptop.
Post back in a Comment.

In the meantime,

1) Check the graphics chipset first.
Connect a VGA monitor to the VGA port, on the laptop.
If the VGA monitor shows the same horizontal split of the LCD screen, then your graphics chipset is bad.

Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port, on the laptop.
This is an example of a VGA Cable, and VGA connector (Port),

http://en.wikipedia.org/wiki/VGA_Connector

Scroll down a little for an example of a VGA Cable.

You can use a CRT type of monitor (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings the display should show on the external monitor.
IF not;

There are at least 3 display options;
A) Internal monitor of laptop ONLY.
B) Internal monitor of laptop AND external VGA monitor.
C) External VGA monitor ONLY.

Here's where it gets rough, Dawn;
Hold the Fn key down, and at the same time tap once on the Display Toggle-Over key.

What key is that? Dunno. Laptop manufacturer name, and model number wasn't stated.
HP is usually the F4 key.
Acer? F5 key
Lenovo/IBM? F10 key.

The F key at top should have a monitor outline symbol, and an arrow on one side; for the Display Toggle-Over key.
No display on external VGA monitor?
Hold the Fn key down again, and tap once more on the Display Toggle-Over key.

Same display of internal monitor on the external VGA monitor?
Bad graphics chipset. Actually it is probably the MOUNTING of the graphics chipset TO motherboard.
More on that if it is the problem.

Good display on external VGA monitor?
Problem is the Video Cable, or inside the Display Assembly.

2) Video Cable:
The Video Cable connects to the motherboard, (In an area under the Keyboard, or Switch Cover above it), runs under the left Hinge; and up into the Display Assembly.
From there it may have a small cable coming from it, that connects to the screen Inverter.
The main part of the Video Cable then connects to the back of the LCD screen.

CCFL backlighting uses a screen Inverter.
(Cold Cathode Fluorescent Lamp)
LED backlighting May, or May Not.

Due to repeated normal opening, and closing of the laptop; the Video Cable may become pinched.
This can cause pulling on the Video Cable, and loose connections.

It can also cause damage to the tiny wires inside the sheath, of the Video Cable.
(Stretched/Broken)
If you see apparent damage to the sheath of the Video Cable, suspect damage to those wires inside.

Loose connection of Video Cable TO motherboard, or TO screen Inverter, (IF used), or back of LCD screen connection.

The procedure is to remove what components are needed from the laptop, to access the motherboard connector side of the Video Cable; and PHYSICALLY check to see if it is plugged in tightly.

{Components may only be the Switch Cover.
Above Keyboard, and below LCD screen. Has the Power On button, indicator LED lights, and perhaps speakers.

May be the Switch Cover AND Keyboard.
May be the Switch Cover, Keyboard, and Palm Rest Cover; in order to access the motherboard connector of the Video Cable }

Disconnect the LCD screen from the Display Cover, to access the LCD screen side connection, of the Video Cable.

Once all connections are proved to be tight, try the laptop again without fully reassembling. See if you can connect everything, with the LCD screen sitting out a little. Perhaps the Switch Cover off, but wires connected.

HOWEVER of you see apparent damage to the sheath of the Video Cable, or if you don't; the Video Cable MUST be ruled out before going on.

Connections tight? Didn't repair the problem? Remove the Video Cable.
A continuity test of the Video Cable must be performed, with a multimeter set to OHM's.
EVERY wire in the Video Cable must be checked for continuity.

Also an assistant is needed to gently wiggle the cable in the middle, and see if you get an intermittent reading on the multimeter.
If so this indicates a broken wire inside the Video Cable.
Replace.

Not everyone has a multimeter laying around.
Suggest take the Video Cable to the nearest small computer shop, and have the resident tech check it for continuity.
Should only be a couple of bucks.
(They say they can't check it? GET OUTTA THERE!
That ain't no REAL tech! Lol!)

Video Cable checks out?
Then the next component to check is the screen Inverter, again IF used.
Problem is to check a screen Inverter requires a sensitive multimeter.
Read fairly expensive,

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

For the above reason; the ease of access to replace, (Just remove Display Bezel), and usually low cost; the screen Inverter is usually just replaced. Average cost is around $20, or less.

Screen Inverter isn't used? Problem is LCD screen.
Screen Inverter replacement didn't repair the problem?
Problem is LCD screen.

I know the above may look like, "Wah, wah, wah", from Charlie Brown. (That's what my niece tells me)

If I had the manufacturer name, and model number, I may be able to give you a link to a Service Manual, and possibly pictorial, or video guides; PLUS step by step info from me.

Makes it less, "Wah, wah, wah", lol!

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

http://www.insidemylaptop.com/taking-apart-hp-pavilion-dv7-laptop-guide-3/

http://www.insidemylaptop.com/how-to-replace-screen-on-hp-pavilion-g7-laptop/

http://www.manualowl.com/m/Acer%20Computers/Aspire-7738G/Manual/114625

Jan 21, 2013 | Computers & Internet

1 Answer

How do you fix a white screen for a dell Inspiron 1100 lap top?


White LCD screen in a Dell Inspiron 1100 Notebook PC?

1) Loose connection of the video cable TO the LCD screen, and/or loose connection of the video cable TO the motherboard.

2) Bad LCD screen

3) Bad motherboard. (More specifically a bad graphics chipset)

To start the diagnoses to find out what the problem is, you will require an external monitor.

This monitor can be a CRT monitor (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable.
(A CRT monitor is a VGA monitor also)

Example of a VGA cable, and a VGA port, (Connector on computer),

http://en.wikipedia.org/wiki/VGA_connector

The VGA port is on the back of an Inspiron 1100 Notebook PC.
It is Blue in color.

A) Laptop OFF, monitor OFF. Connect the VGA cable of the external monitor, to the laptop's VGA connector (Port)

B) Turn the external monitor on. If a CRT style allow it warm up.
Turn the laptop on.

By default, (Factory setting), the external monitor should show the graphics of the laptop.

IF Not;
There are 3 options available,

1) Internal monitor of the laptop - ONLY
2) Internal monitor of the laptop, AND external monitor
3) External monitor - ONLY

If there is NO display on the external monitor, (Display; To include a white screen);

A) Press the Fn key, and hold it down. Now tap the F8 key. (F8,CRT/LCD)

Still no display on the external monitor? Press, and hold down on the Fn key, and tap the F8 key again.

IF, the external monitor shows a white screen, Stop.
You have a bad graphics chipset. Option is to replace the motherboard.

IF, the external monitor shows graphics just fine, diagnose further.

A) Look to see if the Video cable is plugged in tightly to the motherboard, AND connected tightly to the LCD screen.

Dell Support > Inspiron 1100 Notebook PC > Service Manual,

http://support.dell.com/support/edocs/systems/ins5100/en/sm/index.htm

Click on - Display
Under the heading - Display Assembly, look at the partial 'photo' under the number 8.

On the left side where it shows two Philips head screws removed, is the Video Cable. Pinkish wire wrapped around a Light Blue wire.
Look at Number 9.
The display-feed flex cable is the Video Cable.

Make sure it is plugged in tightly to the motherboard.

Now go down to Number 10.
In the exploded drawing the number 7 points to the Video Cable.
(display-feed flex cable)

Shows the Video Cable disconnected from the motherboard, and going up to the back of the LCD screen.

Scroll down to the heading - Display Panel. This shows the connection of the Video Cable to the LCD screen.

Also;
The Video Cable runs through the left Hinge Cover.
Repeated opening, and closing of the laptop, may have damaged the Video Cable.

Observe the sheath of the Video Cable. (Outside wrap)
Does it appear damaged? Pinched? Torn?
Even if it does not, I suggest performing a continuity test with a multimeter.

Multimeter's function knob is set to Ohm's. (Omega symbol)
Positive probe lead (Red) is touched to one end of a wire going through the Video Cable.
Negative probe lead (Black) is touched to the other end of the wire.

Do not be concerned at this time with the Ohmage. Concern is to see if ANY reading comes up, not how much.

Perform a continuity check on all wires in the Video Cable.
(An economical, yet decent enough multimeter for this test, can be purchased for around $5 to $12. A multitude of store carry them. An auto parts store is but one example)

Video cable checks out?
The next suspect is the LCD screen.
However, read on.

Primer:
An LCD screen does not 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.

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

90 PERCENT OF THE TIME the fault is the Inverter.

Example of a screen inverter for a Dell Inspiron 1100 Notebook PC,

http://www.nylaptopparts.com/index.php?main_page=product_info&cPath=91_95_125&products_id=547

An expensive (Read - Sensitive) multimeter can be used to check a screen inverter. Not something everyone has laying around, or access to. In this case I would suggest replacing the Inverter.

(The screen Inverter is also easily accessed, AND much cheaper in comparison, than the LCD screen. Again, 90 percent of the time the fault is the Inverter )

IF, the Inverter does not cure the problem, then the problem is the LCD screen.

Review;
Check the display with an external monitor. Display checks good, run a continuity check on the Video Cable.
Video Cable checks out OK, go to the Inverter.
Inverter does not cure the problem, the problem is the LCD screen.

BEFORE beginning to disassemble;
Remove ALL power to the laptop. Remove the AC adapter (Charger), and Battery.

Observe Anti-Static Precautions.
(I would also advise using an ESD wrist strap, and connect it's alligator clip to a good ground source.

Average cost of a decent ESD wrist strap, is around $3 to $6.
I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.
{Electro Static Discharge)

Use a multi-compartment container for the various screws you will remove.
label each compartment for the area the screw/s come out of.
If no multi-compartment container is available, substitute with a clean egg carton.
Label each egg holder.

SOME screws look VERY similar to other screws.
Do Not mix them up.

For additional questions, or to have me explain anything I have stated here, post in a Comment.

Regards,
joecoolvette

Dec 29, 2011 | Dell Computers & Internet

1 Answer

What happened if nothing appears on the monitor of the laptop even the power is on?


Two possibilities. Your LCD is bad, or your graphics chip is bad on the motherboard. You can determine which it is by connecting your laptop to an external monitor. If you have a display on the external monitor your LCD is bad, if not your motherboard may need replaced.

If you determine it is your LCD have it checked. It may be just a bad power inverter which is around $10 instead of the entire screen.

Apr 07, 2011 | Computers & Internet

1 Answer

My dell laptop lcd splashes the OS and then goes dark. It works fine with an external monitor. I have a feeling that there is a loose connection since the top is almost falling off


Think you have answered your own problem here. If the external screen is ok, then the fault lies with the laptop screen.
Solutions..
1.) Remove keyboard top cover (download a "how to" guide if not familar with doing this)
2.) Remove screen bezel
3.) Check the inverter connections (inverter looks like a thin tube)
4.) Check cabling from motherboard to monitor /inverter for signs of fraying, tears, bare wires
5.) Check connections of the cable for damage.
If the above are ok, then you may have a damaged inverter. In any event, i'd look to repairing the damage to the loose lid, as its putting a strain on the wiring

Feb 09, 2010 | Dell Inspiron™ E1505 PC Notebook

2 Answers

Turn computer on and can faintly see pages on monitor


this is caused by the back light going out on the LCD screen or monitor. you may need a replacement. You may also want to look and check the connection to the motherboard and it may be as simple as it being loose.

Jan 08, 2010 | Dell Inspiron 1501 Notebook

2 Answers

Replaced Dell 1525 screen, now the brightness can't be controlled


if you replaced the screen, might be a pinched wire,or loose connection to the mobo (motherboard)

Jan 05, 2010 | Dell Inspiron 1525 Notebook

1 Answer

On my xps the lcd backlight wont turn on?


could be bad backlight or inventer.

do you see picture but just no backlight?

it could also be a loose connection between the display and the motherboard.

how to replace your laptops backlight:
http://www.instructables.com/id/How-to-Replace-Your-Laptop_s-Backlight/

replace inventer:
http://www.instructables.com/id/Replace-LCD-Backlight-Inverter-on-Any-Monitor-for-/

start by checking for loose connection between the lcd and the motherboard.

Jun 07, 2009 | Dell XPS M1330 Notebook

1 Answer

Samsung laptop black screen


Sounds like a loose connection between your mainboard, inverter or LCD. Try to connect an external monitor and see if the display appears to the external monitor. If a display appears on the external monitor, you need a qualified technician to check your laptop. I fixed 3 laptops with that same symptoms, 1 has loose connector, 1 has ground problem and the other is an inverter.

Apr 09, 2009 | Intel Motherboard

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