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Hp 6735s works on external monitor but not screen

Laptop was ok, then nothing on screen, tried new inverter, still nothing,bought another connector cable, still nothing. A friend connected it to an external monitor and it worked great. Is there a switch that cuts the screen on this model? when lid is closed please help as this is a good laptop.

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This model of HP has had some problems with the video card operating correctly with the os. here is a link to follow to help resolve your issue.

The process will help idenify if your system has issues and will gguide you with the correct step to resolve this.

Good Luck

Posted on Feb 09, 2012


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Posted on Jan 02, 2017

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SOURCE: My screen is dark and i've changed the inverter

Look at your key board and you should see a monitor simble.
Most of the time, you will need to push the function key and the ?? maybe F-4 key at the same time.

Posted on Oct 05, 2009

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SOURCE: D800 laptop will not display on external monitor

Most laptops go into standby mode when the lid is closed. To stop this, (Windows XP) click Start, Control Panel, Performance and Maintenance, Power Options, then click on the Advanced tab, select "Do nothing" in the drop-down for "When I close the lid of my portable computer"

Posted on Feb 12, 2009

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SOURCE: LCD screen is faint XPS M140

You backlight is failing. That is the bulb that provides the brightness to the screen. You need to replace bulb which is very tricky to do unlesss you have experience or replace the screen.

Please rate this if helpful.


Posted on May 05, 2009

  • 5568 Answers

SOURCE: LCD cutting out

In the absence of any flickering, I think it is the inverter for the backlight that has developed a heat problem.
Experiment with this; tilt the laptop, raising it in the rear with anything that does not appreciably block air flow, then use a fan placed behind it aimed at the underside of the case.
If the time before death (blackout) is extended, then it is as described above. If it makes no difference, then it is likely only the fluorescent backlight lamp itself.   

Posted on Dec 15, 2008

  • 179 Answers

SOURCE: There are multi colored vertical

Unfortunately, you're not going to be able to get a new cable as Toshiba will not sell OEM replacement parts to anyone but an authorized repair center.

This may just as likely be a problem with the sockets/plugs as with the cable itself, as they are rather fragile. It may be worth spending a few bucks for a used cable just to see if it will solve your problem. Also be sure that the thin plastic shim found on the top of most of these cable ends is still there, as they can come off rather easily, and the lack of it will cause a poor connection.

Your other alternatives are (1) Toshiba repair center, or (2) using the external monitor.

Hope that's helpful.

Posted on Dec 31, 2010

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1 Answer

Blank screen/white screen

Plug in a monitor to the VGA connector on the side. The white screen usually indicates a failed inverter. By using an external monitor you will cut down the likely causes.

Apr 30, 2013 | HP Compaq for Presario V3000 Motherboard

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My laptop when I turn on the power it appear a hp screen and then it turn black and it appear a dash blinking fast and after that the keyboard cant function when I press any button.

Try this on an external computer monitor. If it works ok there, the inverter on the screen of the laptop is failing and needs replacing, or the screen backlight may also be going ( new screen needed)
If it does not work on an extyernal monitor, its the usual HP problem of a graphics chip unsoldering itself. You will need a new motherboard or a reball carried out.

You can also check that you can hear the fan working, if it is not, and the laptop is getting hot, or if the fan is always on, you have an overheating problem, a dead cpu fan or connector. This will necessitate opening up the laptop and inspecting the fan / cleaning the heatsink.

Jun 12, 2011 | HP Computers & Internet

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Anprguru@hotmail.comProblem with a HP 6735s, when booted the screen displays as if the horizontal hold is defective. However I have tried attaching an external monitor and the problem is NOT reproduced. I...

The sync. processor within the display is faulty and unfortunately an integral part of the screen.
New screen I'm sorry to say.
Ebay have a selection of prices.

Jan 01, 2011 | HP Compaq 6735s Notebook

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My laptop is hp compaq 6735s when i press power button the fan will roll but my screen is black what can i do?

1) First check the Display to make sure this isn't the problem.

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

Do you have a VGA monitor available? (Also referred to as a CRT. Resembles a small TV)
If so, laptop off plug the VGA monitor into the VGA connector on the Left side of the laptop.
(Typical VGA connector, )

Turn the VGA monitor on, and let it power up. Once the VGA monitor is powered up turn the laptop on.
Is there a display on the VGA monitor?

If not press and hold down on the Fn key, then tap the F4 key.
This action should toggle your display over to an external monitor.

Yes? You have a display on the external (VGA) monitor?

Then you have a problem with the Backlight, or the Inverter.

An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is used as an 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.
(Typical size is 3 to 5 inches long, and half the diameter of a No.2 pencil.
A Backlight is located within the metal framework holding the LCD layers together, and is on one edge of those layers. {An LCD screen is composed of layers)

An Inverter is used to provide power from the laptop for the LCD screen, and the Backlight.
90 percent of the time the problem is the Inverter.

An Inverter is a small circuit board located within the Display Assembly. Behind the Bezel of the Display Assembly, and located usually at the bottom of the LCD screen.
(The Bezel is the thin plastic frame that surrounds the LCD screen in the front)

Typical example of an Inverter for an HP Compaq 6735S,

The Display Assembly needs to be removed from the laptop, in order to remove the Bezel, and gain access to the Inverter.
Pictorial guide of how to remove the Display Assembly,

Follow Steps 1 through 7.

This pictorial guide shows how to remove the Bezel. The guide is for replacing a webcam module.
Disregard removing the webcam module, and follow the other steps.

2) If NO display is shown on the external monitor you have a graphic chipset problem.
This requires replacement of the motherboard.

Chip and Chipset are slang terms to mean I.C.
Integrated Circuit.

The graphics chip is mounted to the motherboard with a BGA surface mount. (Ball Grid Array)
Having the chip removed and replaced is more expensive than replacing the motherboard.

This is the download page for the Service Manual (Free) from HP Support,

Under the heading > Service and maintenance information, click on the file name,

HP Compaq 6730S and 6735S Notebook PC - Maintenance and Service Guide.

This is a PDF file.
Usually takes 2 to 5 seconds to see the first page come up, and additional time for the file to fully download.
Suggest you let the file download all the way before looking through it.


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Black screen when turn on the computer

The problem could be a loose video cable/connector.
Reseat the video cable or the connector that connects to the motherboard.
To check if the video card is faulty, connect an external monitor to the video port on the HP, power up the external monitor first, then bootup the laptop. The video will automatically switch to the external monitor and if you see a normal image then the video card is OK and the fault is the LCD screen/video connector.
If you see a faint image when you view the LCD screen at a sharp angle, then the fault could be the CCFL lamp or the inverter that supplies high voltage to the CCFL lamp.

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Hp pavilion ze5500 display monitor still doesn't work

IT could be a motherboard problem with the function key that controls the switching of the video infomation between the LCD screen and the external video connector.
It could be the function key circuitry on the motherboard that controls the back lighting levels on the LCD.

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1 Answer

Hp pavilion ze4930us notebook pc is dead

Hi danielb59,

Let do troubleshooting together.

First) if possible, connect a external monitor to your laptop. If you get a picture on the external monitor, then this means your pc is ok but the monitor screen on the laptop has gone bad.

Second) if the monitor screen on the laptop has gone bad, most likely the inverter component on the screen went bad (inverter provide back light). The inverter is replaceable but I do not know what they run. If your laptop is still under warranty, then please allow the manufacturer to fix it.

Those are your choices. Hopefully it helps and good luck.

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2 Answers

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The problem is with the inverter or screen. Since you changed the inverter, the screen is the only thing left. The cable will not cause this, it will cause the screen to blank out completely. You need to replace the screen.

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