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Can i connect a presario v3500 laptop to an external momitor. @I think the display inverter is gone and i need to get some files off the lap top for work.

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Yes, connect the external monitor to the port it corresponds on the laptop, usually the blue port. When you boot the computer hit the FN key located on the bottom right hand side of your keyboard and the LCD/CRT key i believe this will be the F4 key located on the top part of your keyboard this should activate the external monitor.


Posted on Feb 25, 2009


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Horizontal black line at bottom of laptop screen/ Compaq Presario C700

Alan, let's diagnose;

1) Do you have access to a VGA monitor? (CRT style. Looks like a small TV)
How about a flat LCD screen monitor with a VGA cable?

Need to see if the problem is the graphics chipset, or the Video Cable, or inside the Display Assembly.

A) Laptop OFF, monitor OFF, connect the VGA monitor, to the VGA connector on the laptop. (Left side towards the Front)

B) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By default (Factory settings), the display should show on the external VGA monitor.
IF not;

There are at least 3 display options;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold the Fn key down, (Second key from left on bottom), 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.

Display on external VGA monitor OK? Problem is the video cable, or inside the Display Assembly.

Line still on display? Problem is the graphics chipset, or it's mounting to the motherboard. (BGA surface mount)

Problem with Video Cable or Inside the Display Assembly:

Video Cable; Display Cable when referring to an HP, or Compaq laptop.

The Display Cable attaches to the motherboard, under the left side of the Keyboard, and towards the front. It then routes under the left Hinge, and up into the Display Assembly.

From there it splits, and connects to the screen Inverter, and back of the LCD screen,

{ In the photo; On the right side there is a wide connector, (Top), and a small connector, (Bottom)
The wide connector connects to the motherboard. The small connector connects to the screen Inverter.

The connector to the far left connects to the back of the LCD screen}

Just from normal opening, and closing of the laptop, repeatedly, the cable can be pulled on. It can also be pinched in the left Hinge, and be pulled on.
This can cause two things:

1) Can pull the cable so the connection at the motherboard is loose, or loose at the screen Inverter, or back of the LCD screen. Or all three.

I have repaired a few laptops whereby this was the problem. I also have a few users on here, who reported this was the problem.

You have to remove the Switch Cover, and partially remove the Keyboard, to access the motherboard side connection, of the Display Cable.
You have to remove the Display Assembly, and open it up, to access the LCD screen side connection.

You CANNOT just visually inspect the connections, and assume they are plugged in tightly.
You need to physically, make sure the connections are plugged in tight.

The Switch Cover is just that. A cover.
The Keyboard has a Keyboard Cable, that stays attached to the Keyboard, and is connected to the motherboard connector.

Therefore, when checking to see if just the motherboard connection is the problem; you can just leave the Keyboard Cable attached to the motherboard, and fire the computer up after physically checking the motherboard connection.

{ Flip the Keyboard over, and lay it down on the Palm Rest Cover.
Excuse me. Top Cover for HP and Compaq }

With the LCD screen, and screen Inverter connections, you can lay the LCD screen down on your 'work' table, and try it. This way you can try it to make sure it is the problem, before reassembling the laptop.

Otherwise you will be removing the Display Assembly again, and opening it up, again.

[This will all make more sense as you read on ]

The Display Cable can also be damaged. Visually check the sheath of the cable. ANY apparent damage, may result in damage to the tiny wires inside the sheath. (Stretched/Broken)

Test the wires inside the display cable for continuity. This is done with a multimeter set to OHM's. (1K)
If you do not have access to a multimeter, perhaps take it to a 'Mom and Pop' computer store to have it checked. Should only cost a few bucks.

Display cable connections are tight/ cable checks out?
Problem is the screen Inverter, or LCD screen.

The screen Inverter is checked with a Sensitive multimeter.
Read fairly expensive,

Perhaps the 'Mom and Pop' computer store again.

{ A screen Inverter, and an LCD screen are a MATCHED unit. If the Inverter is the problem, make SURE you get the correct one. Same thing with an LCD screen. Make SURE you get the correct one }

Screen Inverter checks out? Problem is the LCD screen,

[ALL of the parts shown are just for examples. NONE are for advertising ]

To Add:
An LCD screen cannot produce light,

Click on the monitor icon. (I also would click on -> No thanks)

An LCD screen needs an additional light source. A Backlight is the additional light source.
A Backlight can be a CCFL, or a series of LED's.
(Light Emitting Diode)

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.
In the next example look at the last 5 photos,

The Compaq Presario C700 series of Notebook PC's uses a single CCFL.

A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.
90 PERCENT OF THE TIME, the fault is a bad screen Inverter.

This is a link to a free Service Manual from HP Support,

In the list click on -
HP G7000 Notebook PC and Compaq Presario C700 Notebook PC -
Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe reader on it, which uses PDF files.
After you click on the above file name it may take up to 30 seconds, before the first page comes up.

In the Bookmarks menu to the left;

1) Click on the + sign to the left of -
Removal and replacement procedures
2) Click on the + sign to the left of -
Component replacement procedures

3) Click on one at a time -
Switch Cover
Display assembly
Page 58 for the screen Inverter.

A) Remove ALL power. Remove the AC adapter (Charger), and Battery
B) De-static yourself before working on the laptop. Perhaps there is a large metal serving plate (Unpainted), you can set on the table, or a large metal knickknack. (Unpainted) Touch before working.

C) 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, you can substitute with a clean egg carton. Label each egg holder ]

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

Need advice along the way post back in a Comment. I'm right here.


Jul 26, 2012 | Compaq Presario C700 Series Laptop...

2 Answers

Hi, I have a laptop compaq presario cq 60 .When I switch on the computer the fan start working but the screen is black doesn't start .What could be the problem? Thank you


If you see power lights but nothing appears on the screen, it could be a "POST" (Power-on Self Test) problem or simply LCD problem.

Here are some steps that you can try. One of these may work on your case.

1. Remove the battery and the ac adapter then press the power button for at least 20 seconds to drain electric charges left on the system. (You may need to repeat this step to get it work.)

2. If above step doesn't work, try to plug in an external monitor and see if you get display from the external monitor.

3. If you get display from the external monitor, I'm sure your having problem with the LCD components. In this case, check and replace faulty LCD backlight, LCD cable or LCD inverter. The LCD inverter is often a culprit.

4. Try to reinsert the memory module/s (RAM) of the unit, try using one RAM at a time to see if it works. A faulty RAM will cause the laptop not to POST.

5. If reinserting the RAM doesn't help, most likely your motherboard needs to be replaced.

Hope this helps.

Jul 17, 2011 | Compaq Presario CQ60-212US Notebook

1 Answer

Lap top screen blank

try connect yr laptop to external monitor and see result. if display come that mean yr lcd or connection to yr lcd or inverter problems. but, if prpoblems still same, most likely yr problems is motherboard or display chipset


Feb 19, 2011 | Toshiba Computers & Internet

3 Answers

How to instal xp on compaq presario v3500 laptop.

get the cd xp installer, reboot your machine when appear press any key to install windows press any key and fallow the instructions thqt appear there on screen

Aug 01, 2010 | HP Compaq Presario V3000T Notebook

1 Answer

This lap top has no picture - the screen is black


Connected a monitor to the laptop to see if the video card is faulty.
If an external monitor works, it is the display's backlight or inverter board.

If you were experiencing discoloration in the screen (pinkish lower light hues) before it failed, that would indicate a CCFL backlight issue. If the screen suddenly went dim on you rather than a slow degradation the inverter would be indicated.

Hope this helps.

Jul 03, 2010 | Computers & Internet

1 Answer

My lap top r 4000 light up and fan works but no display could this be the battery I replaced the power supply today

Hook it up to an external monitor, if that works. Might need a new Lcd display or at least an Inverter. May be a pinched wire near the hinge of the lcd display.

Doubt it's a batter problem, plug in the power supply , take out the battery and try.

Oct 16, 2009 | HP Compaq Presario R4000 Notebook

1 Answer

I cannot get my lap top to show on the all with my projector

Laptop will often have a function key (usually F5) for cycling between built-in display, external monitor, and both. Try pressing F5. If that doesn't work and you have a "Fn" key (usually near the left Shift key) hold down Fn and press F5.

Oct 11, 2009 | Compaq Presario Notebook

1 Answer

When i turn the lap top on it powers fine but no screen

Connect an external monitor to the laptop. You'll need to use your function keys to switch to the external monitor. If this works, your screen, inverter or screen fuse(if it has one) have gone bad. If this is the case, take it to a reputable repair person.

Mar 29, 2009 | HP Pavilion dv8000t Notebook

1 Answer

Compaq V2000 Display blacks out

sounds like the backlight has gone....test with an external monitor....if the external monitor works without any problems...the backlight has gone...better to get a professional to do this as its kind of fiddly and involves taking the screen apart

Dec 22, 2008 | HP Compaq Presario V2000 Notebook

3 Answers

Monitor problem

with the notebook on shine a light onto the screen and see if you can see anything, if you can then its you backlight that has gone out. if you can't see anything. it may be the power inverter

Aug 19, 2007 | Compaq Presario R3000Z Notebook

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