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Compaq presario backlight

Inverter is ok and screen is also ok but black light on screen

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This is a laptop issue

Posted on Apr 02, 2014

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Posted on Jan 02, 2017

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Display problems


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

Feb 13, 2013 | HP Compaq Presario V2000 Notebook

1 Answer

The screen on my compaq presario cq56 is black


The problem is caused by the inverter board, "just below the screen" is more than likely the problem, or it is the backlight behind the LCD display, "built in" less likely.

Apr 23, 2012 | HEWLETT-PACKARD Compaq Presario CQ56-129NR...

1 Answer

My wife's compaq presario f700 turns on yet the screen is really dim to the point of almost being all black! I can see some things with some strain or added light. Please advise.


Screen backlight is probably failing, the fact that you are getting an image suggests that the inverter is ok (although replacement is often the only way of telling).

Firstly, plug the laptop into an external monitor, if the picture is clear, this will confirm that the issue lies with the backlight or the inverter, if however it does not, then you may have issues with the onboard graphics chip beginning to fail (expensive as it will need a new motherboard).

The only other cause can be a damaged VGA lead (unlikely).

Best guess would be that the laptop screen needs replacing, as replacing the tube for the backlight is a very difficult task and not really worth the effort or expense. You can find some good 2nd hand screens now for a 15.4 laptop quite cheaply and replacement is very easy

May 29, 2011 | Compaq Presario 700 470024-192 Notebook

1 Answer

Hallo , I have compaq presario c745ee , and suddenly the screen getting black but every thing is working , sound , fan sound .. every thing , I connected the laptop to a lcd and it is working probably , I...


Hello !

Since 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 rather than a slow degradation, the inverter would be indicated.

In either case, a technician in your area should be able to help. Evaluate to see if the repair is cost-effective.

Hope this helps.

May 02, 2011 | HP Compaq Presario C700T

1 Answer

My hp compaq Presario V6500 has been damaged and a computer dude in Bathurst NSW said we need a bulb replaced in the screen as it won't light up. Computer functions via TV. R there any local repairers for...


The monitor screen on your laptop is an LCD screen.

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

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

LCD screens are a composite of layers. The layers are held together by a metal frame, much like a picture frame.
The Backlight is usually located on one side, accessed after removing one side of the metal frame.

As stated, a Backlight is a very small type of Fluorescent lamp, (Tube)
Very fragile, easily breakable, and not usually approached by one who has very little, or no experience in replacing.
More common the entire LCD screen is replaced, which includes the Backlight already installed.

A laptop also needs an Inverter to provide power, both for the LCD screen, and the Backlight.

90 percent of the time the fault is the Inverter.
I repeat, 90 percent of the time the fault is a bad Inverter.

An Inverter is cheaper than an LCD screen, and MUCH easier to replace than a Backlight.

Allow me to show you replacing an Inverter on an HP Pavilion dv6000 series laptop.
Granted, it isn't an HP Compaq Presario V6500 series, but the principles still apply the same,

http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/

I can also provide a free link, to the Service Manual for an HP Compaq Presario V6500 laptop, direct from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=3369429&

In the list click on;
Compaq Presario V6500, V6600, and V6700 Notebook PCs-Maintenance and Service Guide

This is a PDF file.
Allow up to 30 seconds to see the first page, and an additional time may be needed to fully download.

In the Bookmarks menu on the left click on the + sign next to;
1) Removal and replacement procedures
2) Component and replacement procedures
3) Display assembly

And/or go directly to Page 61 to view the Inverter location.

One example of an Inverter for an HP Compaq Presario V6500,

http://www.sparepartswarehouse.com/Compaq,Presario,V6500,Laptop,Inverters.aspx

Granted this is not what you asked for.
My premise is to teach, and hopefully save people money.

If you have additional questions please state in a Comment.
Regards,
joecoolvette

Mar 06, 2011 | Compaq 449901-001 - HP Presario V6500...

1 Answer

Compaq cq60 - screen black - laptop on


Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then 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 08, 2010 | Compaq Presario CQ60-220US PC Laptop

1 Answer

No video on Compaq presario C306


When the backlight is black ie. the CCFL lamp is not illuminated that means the CCFL lamp is dead (it is basically a very small fluro tube) or the inverter is faulty and it is unable to supply high voltage to the CCFL lamp.
make sure the inverter is firmly seated and connected.
Check the wires to the CCFL lamp, there is a couple of wires from the inverter to each end of the CCFL tube.
Check the CCFL lamp voltage on the inverter it should be 100 - 150 volts.

May 05, 2009 | HP Compaq Presario C306US Notebook

1 Answer

LCD Screen is black


It could be either, if you can get another LCD screen (same make/model) you can swap to ckeck it out.
You could check the inverter by touching its output and if you get a bit of an electrical shock then you know the inverter is working or check it with a multimeter if you don't like electric shocks.

Dec 27, 2008 | HP Compaq Presario V2000 Notebook

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