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Damage to internal leads from screen to keyboard

The internal leads inside any laptop or notebook which connect the keyboard to the screen board are made up of tiny strings of electric wires, constant bending of wire causes it to eventually snap. So if at all possible keep the opening and closing of your laptop or notebook to a minimum.

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fix black screen


Computer got you stressed?....................Life getting you down?...

Feel like if one more tiny problem comes up, you're just going to end it all?

.........GET OVER IT!

"$^&%^*&& HELP ME PLEASE #@%^&&^%^&*"

Don't ever come to this website, and post that again

Help me please?..................Yes

Moving on................

An external monitor works
Good. This way you know the problem is either the Video Cable, or inside the Display Assembly.

Video Cable:

With the Compaq Presario C700 series of Notebook PC's, the Video Cable connects to the motherboard; in an area under the Keyboard, and Switch Cover.
(Above the F4 key)

It then leads under the left Hinge, and up into the Display Assembly.
From there a small cable branches off, and connects to one side of the Screen Inverter.
The main part of the Video Cable, goes on to connect to the back of the LCD screen.

Example of Video Cable,

http://www.amazon.com/G7000-Compaq-presario-Video-cable/dp/B005NEPKTE

The large connector on the Right side, connects to the back of the LCD screen.
The smaller connector shown at Bottom connects to the motherboard.
The small cable leading up to the Top/Left, connects to the screen Inverter.

http://www.ebay.com/itm/New-COMPAQ-Presario-CQ50-CQ60-HP-Pavilion-G50-G60-G70-LCD-INVERTER-486556-001-US-/281024427508?pt=LH_DefaultDomain_0&hash=item416e5c75f4

Just from repeated normal opening, and closing of the laptop; the Video Cable may become pinched, and pulled on. Sheath of Video Cable also hardens over time, and this also adds to the equation.

However, this laptop has been dropped. There's a real good chance of a problem with the Video Cable.

Pulling on it can lead to the connections coming loose.
Motherboard side, screen Inverter cable, and LCD screen side.

Procedure is to go through the various connections, and PHYSICALLY check them. Try to plug them in tighter.

Motherboard connection:
1) Remove ALL power. Remove the AC adapter (Charger), and Battery.

2) Disconnect the Keyboard, HOWEVER do not disconnect the Keyboard Cable from the motherboard.

Once Keyboard is removed from Palm Rest Cover, take the LCD screen side, and roll the Keyboard over.
Bottom side up, lay on Palm Rest Cover.

3) Now remove the Switch Cover.
The Switch Cover is the wide strip of plastic, above the Keyboard, and below the Display Assembly.

The Switch Cover is just that........a Cover.
No wires attached.

Physically check motherboard connection.
Reinstall power. Turn laptop on.
No change?
Remove ALL power again.

LCD screen side connection and screen Inverter connection:
4) The plastic frame in front of the LCD screen, is the Display Bezel.
Remove it.

Right behind the Display Bezel, and mounted on the bottom/middle of the Screen Frame; is the screen Inverter.
Just physically check the screen Inverter connection, but go on to the LCD screen side connection.

The LCD screen is an assembly of layers. These layers are held in the factory set position, by a metal Screen Frame.
Resembles a picture frame.

Attached on either side of the Screen Frame, are Brackets.
The brackets are attached to the Hinges, and the whole assembly is just referred to as a Hinge.

There are screws that hold the Hinge brackets to the Screen Frame. There are also screws that hold the Screen Frame together.
Be SURE as to which screws you remove. You do not want to remove the Screen Frame screws.

Remove the screw that hold the Hinges to the Screen Frame.
Tilt the Top of the LCD screen forward towards you, and physically check the LCD screen side connection; of the Video Cable.

Lay the LCD screen back, put a screw in on each side, to temporarily hold the LCD screen in place.
Reinstall all power. Turn the laptop on.
Still no joy?

Remove the Video Cable.
The Video Cable needs to have a continuity test performed, with a multimeter set to OHM's. (1K)
Every wire in the Video Cable is checked.
No reading on a wire indicates a stretched/broken wire.

An assistant should also be used, to gently wiggle the Video Cable while checking.
An intermittent reading on the multimeter indicates a stretched/broken wire.

Or take the Video Cable down to the nearest small computer repair shop, and have the resident tech check it for continuity.
Should only be a coupla' bucks.

The Video Cable MUST be ruled out, before going on........

5) Video Cable checks out OK, or a replacement is used; and still no display on laptop's internal monitor, the screen Inverter is next in the diagnosis.

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

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

Due to this, the ease of accessing to replace, and the usually low cost; the screen Inverter is just replaced.

6) If the new replacement screen Inverter brings no joy, then the problem is the LCD screen.

HP Support > Compaq Presario C700 series of Notebook PC > Manuals > Service Manual,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3559331&

Scroll down, and click on -
HP G7000 Notebook PC and Compaq Presario C700 Notebook PC - Maintenance and Service Guide

At the top is the Adobe Reader page number box
Page 21 is the start of the Illustrated Parts Catalog.
The next page shows you an exploded drawing of the laptop.

Page 58 - Keyboard
Page 61 - Switch Cover
Page 63 - Display Assembly

http://armbrust.dyndns.org/tips/presario700/

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

The F700 HAS wires to the Switch Cover. The C700 does not.
Just posting to give you a hands on look, instead of just a Service Manual.

02:59 - Here you can see how I described LEAVING, the Keyboard Cable attached to the motherboard, and just rolling the Keyboard over onto the Palm Rest Cover.

In Spanish, but a 'Picture is worth a thousand words', they say,

http://www.youtube.com/watch?v=55Wcej_K3ag

Not the Presario C700, but shows in better detail on releasing the Lock Clips (Detents), at the Top of the Keyboard,

http://www.insidemylaptop.com/hp-2000-laptop-disassembly/

Specifically photos in Steps 9 through 11.

Regards,
joecoolvette

(You won't need an ESD wrist strap for this procedure. However if you have one, wear it by all means.

IF, you remove the Palm Rest Cover, then you better be wearing an ESD wrist strap; and have it's alligator clip attached to a good ground source )

Apr 06, 2013 | Compaq Presario 700 470024-192 Notebook

1 Answer

Need to replace keyboard on toshiba laptop Att300


Laptops are a great line of computers that offer their users portability. However, one drawback of laptops being so portable is that all of their components are internally attached. Replacing things on a desktop computer can be as easy as unplugging a cord. With laptops, simple things like changing a laptop's keyboard becomes slightly more complicated.

Unplug the laptop's power cord from the wall outlet and remove the internal battery pack. To remove the internal battery pack, simply locate the release button on the bottom of the laptop. This button needs to be held in while the battery pack is slid free from the computer. This button locks the battery in place, so if it is not held in the battery pack will not be able to be removed. Unscrew all of the screws from the bottom of the laptop. All laptops have different amounts of screws holding the external case together; however, there is usually one screw at each corner, and then one or two screws in the center of the laptop. Once all the screws are removed, slide the laptop's hard drive from the computer. The computer's hard drive will generally be located on the left or right side of the laptop; there will be a small symbol engraved into the laptop to denote its location. Remove the screen from the body of the laptop. To do this, remove the two screws from the back of the computer that hold the screen's hinges in place. Once the screws are removed, pull up gently on the screen until the two pegs that held the screen up have cleared the holes in the laptop's body from which they rested. There will be two wires that lead away from the laptop screen so make sure not to pull up so far that they become disconnected. Separate the two plastic halves of the laptop's external case to expose the computer's internal components. Lift up on the keyboard pad and flip it on its face. You will notice a film-like strip that leads away from the keyboard and into the heart of the laptop. Before you can remove the keyboard, you must unscrew the metal piece that covers the computer's motherboard. This piece takes up the majority of the inside of the computer, so it will be very obvious to you when you are looking inside the laptop. Disconnect the keyboard connection after the metal covering from Step 4 has been removed. To remove the keyboard, follow the film-like strip back to where it connects to the computer's motherboard. The end of the connection will be held down by a small plastic tab. Pull up on this tab to release the keyboard connector and simply lift the old keyboard out of the laptop. Connect the new keyboard to the laptop. To do this, simply stick the end of the new keyboard's film-like connector inside the plastic tab that you released to remove the old keyboard. Push the tab back down so that it holds the end of the new keyboard's connector in place. Reassemble the computer by putting the components back in the exact spot you removed them from.
http://www.laptop-repair.info/laptop_keyboard_repair.html

Jan 20, 2013 | Computers & Internet

1 Answer

keyboard replacement


Unplug the laptop's power cord from the wall outlet and remove the internal battery pack. To remove the internal battery pack, simply locate the release button on the bottom of the laptop. This button needs to be held in while the battery pack is slid free from the computer. This button locks the battery in place, so if it is not held in the battery pack will not be able to be removed. Unscrew all of the screws from the bottom of the laptop. All laptops have different amounts of screws holding the external case together; however, there is usually one screw at each corner, and then one or two screws in the center of the laptop. Once all the screws are removed, slide the laptop's hard drive from the computer. The computer's hard drive will generally be located on the left or right side of the laptop; there will be a small symbol engraved into the laptop to denote its location. Remove the screen from the body of the laptop. To do this, remove the two screws from the back of the computer that hold the screen's hinges in place. Once the screws are removed, pull up gently on the screen until the two pegs that held the screen up have cleared the holes in the laptop's body from which they rested. There will be two wires that lead away from the laptop screen so make sure not to pull up so far that they become disconnected. Step 4 Separate the two plastic halves of the laptop's external case to expose the computer's internal components. Lift up on the keyboard pad and flip it on its face. You will notice a film-like strip that leads away from the keyboard and into the heart of the laptop. Before you can remove the keyboard, you must unscrew the metal piece that covers the computer's motherboard. This piece takes up the majority of the inside of the computer, so it will be very obvious to you when you are looking inside the laptop. Disconnect the keyboard connection after the metal covering from Step 4 has been removed. To remove the keyboard, follow the film-like strip back to where it connects to the computer's motherboard. The end of the connection will be held down by a small plastic tab. Pull up on this tab to release the keyboard connector and simply lift the old keyboard out of the laptop. Connect the new keyboard to the laptop. To do this, simply stick the end of the new keyboard's film-like connector inside the plastic tab that you released to remove the old keyboard. Push the tab back down so that it holds the end of the new keyboard's connector in place. Reassemble the computer by putting the components back in the exact spot you removed them from.
http://www.laptop-repair.info/laptop_keyboard_repair.html

Jan 20, 2013 | Computers & Internet

1 Answer

fix my broken acer aspire 9805wkhi display


Horizontal lines going down the screen, generally indicate a problem with the Video Cable, or screen Inverter.

The Acer Aspire uses a screen Inverter, because the Backlight is a CCFL. (One)

Primer before I go on;
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 two of them), or a series of LED's.
(Light Emitting Diode)

As stated previously; the Aspire 9805wkhi Notebook PC, uses a single CCFL for a Backlight.

http://www.screentekinc.com/Acer_Aspire_9800_Series_9805WKHi--20.1-inch--1680x1050-wsxgaplus-laptop-lcd-screen.shtml

http://www.laptop-power.co.uk/laptop-screens/acer/aspire/series-9800/model-9805wkhi.html

http://www.screenaid.com/acer-aspire-9805wkhi-laptop-lcd-screen-17-wxga-glossy-ccfl-backlight-p-8646.html

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.

Basic example of a CCFL,

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

View the last 8 photos.

A screen Inverter is used to convert the power (Electricity), from the laptop; for the LCD screen, and Backlight.
Note* Laptops that use a series of LED's for a Backlight, do not use a screen Inverter.

Primer over.
A) An external display device, such as a VGA monitor for example; should be connected to the laptop ->First; to make sure the graphics chipset is OK.

I believe it is OK, but this is a diagnostic flowchart, and the graphics chipset HAS to be eliminated as the problem; Before going on.

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

The VGA port is right in the middle, on the back of the laptop. Here is an example of a VGA port,

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

(Scroll down for example of 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.

With this laptop you can also plug a DVI connector, from a flat LCD screen monitor (Usual connector for digital flat screen), and use it instead. It's the white(?) port right next to the VGA port. (Closer to Left side, than VGA port)
Example of a DVI port, and DVI cable,

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

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

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

Press the Fn key, hold it down; and tap once on the F5 key.
(The F5 key is the Display Toggle-Over key)
Still no graphics on external display device?
Hold the Fn key down again, and tap once more on the F5 key.

Good graphics on external monitor = Go on.
Bad graphics on external monitor = Problem with the mounting of the graphics chipset; to motherboard. Or bad graphics chipset. (Not very common)

B) Video Cable:
The Video Cable connects to the motherboard, up under the Keyboard. (And Top Cover's metal Static Shield) From there it routes up under the left Hinge, and up into the Display Assembly.

The main part of the Video Cable, then connects to the back of the LCD screen. There is also a separate cable coming from the Video Cable, that connects to one side of the screen Inverter.

The thin plastic 'frame' in front of the LCD screen, is the Display Bezel.
The screen Inverter is a small long circuit board; located behind the Display Bezel, and mounted down towards the bottom of the Screen Frame.
Basic example,

http://www.amazon.com/Inverter-Aspire-6930G-8920G-8930G/dp/B005GCD446

{The LCD screen is an assembly. It is composed of layers held in a specific pattern, by the Screen Frame. A thin metal 'picture frame', if you will.

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

Click on the monitor icon }

Due to just normal repeated opening, and closing of the laptop; the Video Cable can become pinched, then pulled on.
This can lead to a loose connection at the motherboard side; and/or back of LCD screen. (Also check screen Inverter connection)

Can also cause damage to the tiny wires inside the Video Cable.
(Stretched/Broken)
If there is obvious signs of damage to the sheath of the Video cable, there may be damage to the tiny wires inside.

To add; with age the insulation of the tiny wires inside the Video Cable, can deteriorate.
This can lead to exposed wires inside the sheath of the Video Cable, and lead to their touching each other.

It is best to perform a continuity check, with a multimeter set to OHM's. (1K)
Check each wire. Also have an assistant gently wiggle the Video Cable, as you check it. (Fluctuation of reading of multimeter, indicates a broken wire)
If you do not have access to a multimeter, perhaps take the cable down to the nearest small computer repair shop; and see if they will run a continuity test for you. (Few bucks)

The Video Cable's condition, and connections; HAVE to be checked before going on.
You MUST rule the Video Cable out as the problem.


Problem here is there is no Service Manual; nor guides in how to disassemble, that I have found; nor has one come into the shop.
(Made in what? 2006? Hmmm?)

Looking at the reviews of it, to see what it looks like; the laptop looks to be the type of model that the Keyboard is removed, then the Top Cover (Upper Case); THEN access to the motherboard side of the Video Cable, can be gained.

Fun stuff, huh?

ALL power is removed. Remove the AC adapter (Charger), and Battery.
Use a multi-compartment container for the various screws you will remove. Label each compartment for the area the screw/s come out of.
SOME screws look VERY similar to other screws.
Advise DO NOT mix them up.

Basically follow what this gentleman is doing. Screw locations may not be the same for the inside area on the bottom; but will have screws that go around the perimeter of the Base Enclosure.
(Bottom Cover)

http://www.youtube.com/watch?v=6k-FnZze3c0

Also on yours, look down in the Battery Compartment for screws to remove, and when the DVD drive is removed, see if any screws are along the 'lip'. The outside edge of the laptop; where the outside edge of the DVD drive was.
(Going from bottom view towards the Top Cover, there may be screws in that 'lip')

Look along the compartment opening edges, too. (Along the lines of the one's he found )
Ram Memory compartment, etc.

The Keyboard has Tabs on the bottom edge. The edge that faces you, not LCD screen side.

http://www.amazon.com/Acer-Aspire-9805WKHI-Replacement-Keyboard/dp/B006T0V8VA

(Click on photo to enlarge)
When the Keyboard is removed, it is slightly tilted up on the LCD screen side; and then moved forward a little. (LCD screen side)
If you lift the Keyboard straight up, you may break the Keyboard tabs, and/or Top Cover.

The top of the Keyboard has Detents.
May be 3 to 4. (Maybe 5)
The Detents are small (Very) rectangular shaped, and right above the Keyboard. Once depressed with a flat tipped Jeweler's screwdriver, the Keyboard can be slightly lifted in that area. (LCD screen side)
Then go to the next one, and slightly lift the Keyboard, and so on.

The Keyboard Cable STAYS attached to the Keyboard. It has NO connector on the motherboard end. (No plug connector)
It is a Flat Flex Cable.

After all screws are removed, the Top Cover pops loose.
The Top Cover has Tabs, and the Base Enclosure (Bottom Cover), has matching Latches.

http://www.youtube.com/watch?v=3AxVE6__kEY

You have to PHYSICALLY check the motherboard connection side of the Video Cable, AND LCD screen side. Visual inspection will NOT do.

http://www.insidemylaptop.com/replace-screen-on-acer-aspire-5830tg-6782-laptop/

Look for screw covers going around the perimeter, of the Display Bezel. These are usually plastic, or synthetic rubber. I just gently pry up on one side of the cover, and then pry it up, and off.

The screw covers are attached with a type of rubber cement.
If carefully pried off, the screw cover, and it's glue may be reused.
[ Most of the time. I stick them (L-I-G-H-T-L-Y) to the Display Bezel, for safekeeping ]

Now remove the Philips head screws.
The Display Bezel is gently pried off, by flexing one side; and sliding your fingertips under it.
(On LCD screen side. I wear computer gloves. You may wish to cut a cereal box, or similar cardboard; to fit the inside edges of the Display Bezel; and protect the LCD screen from your fingernails )

Work along heading towards the Top, and around.
Once the Display Bezel has popped about halfway, or more off; the Display Bezel should come the rest of the way off all at once.

Remove the screws which hold the LCD screen to Display Cover.
Tilt the top of the LCD screen towards you; so you can access the Video Cable connection; to LCD screen.

Continuity check reveals the Video cable to be OK? Connections were tight?
Replace the screen Inverter.

Testing a screen Inverter = using a Sensitive multimeter.
Read fairly expensive,

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

Due to this; the low cost, and ease of access to replace; the screen Inverter is usually just replaced. Have to work with what you've got.

Screen Inverter replacement doesn't do the trick; replace the LCD screen.

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

Dec 20, 2012 | Acer Aspire 9805WKHi Notebook

1 Answer

laptop all whit screen


Dell Inspiron 1420 Notebook PC?

The white screen can be fixed. How?

Connect a VGA monitor to the laptop. Connect to the VGA port on the right rear. Example of a VGA Cable, and VGA connector,

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

You can use a CRT type monitor, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable.
By default the display should show on the external VGA monitor.

No?
Press, and hold the Fn key down, and at the same time tap the F8 key ONCE.
Still no?
There are 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 again, and tap once more on the F8 key.

No display on the external VGA monitor, means you have a bad graphics chipset. Replace motherboard.
Display does show on the external VGA monitor, means you have a problem with;

1) Video Cable
or
2) Screen Inverter
or
3) LCD screen

Video Cable:
The Display Panel Cable (Video Cable for Dell), connects to the motherboard by the left Hinge.
Goes under the left Hinge, and up into the Display Assembly.
It then connects to the Screen Inverter, and to the back of the Display Panel. (LCD screen for Dell)

From normal opening, and closing of the laptop, the Display Panel Cable may become pinched in the left Hinge.
This can cause;
A) The connection at the motherboard to come loose
B) The connection at the back of the Display Panel to come loose
C) Stretch the wires inside the Display Panel Cable's sheath, and damage the wires. (Break)

If you are lucky just the connection at the motherboard, and/or connection at the back of the Display panel, may have come loose.

Diagnoses is to NOT just look at the connections, but physically push the connectors of the Display Panel Cable, into the connector at the motherboard, AND back of the Display Panel.

Visually inspect the Display Panel Cable's sheath. Do you see any outward appearance of damage? This means the tiny wires inside may be damaged.
Replace the Display Panel Cable.

Remove ALL power. Remove the AC adapter (Charger), and Battery.
Remove the Keyboard Cover.

Unfasten the Keyboard, LEAVING the Keyboard Cable ATTACHED to the motherboard. Roll the Keyboard over, and lay it upside down on the Palm Rest Cover,

http://support.dell.com/support/edocs/systems/ins1420/en/SM/display.htm#wp1129771

[ NOTE*
Two Philips head screws at top of Keyboard. After removing, lift the top of the Keyboard up a little, slide it a LITTLE towards the Display Panel.
DO NOT lift it straight up at first.
There are 3 plastic tabs on the bottom of the Keyboard, that slide into the Palm Rest Cover. If you pick it straight up you will break those tabs off ]

In Removing the Display Assembly, note where number 1 points to.
This is the Display Panel Cable's connection, TO the motherboard.

Note where number 2 points to. Those cables going to the Mini-Card Antenna, HAVE to be reconnected, right back to the SAME terminals on the Mini-Card. Make a mark on the cables, and matching marks on the Mini-Card.

Use the instructions in Removing the Display Bezel.
Use the instructions in Removing the Display Panel.

View the last illustration in Removing the Display Panel.
Note how the Display Panel Cable attaches to the Display Panel, and Screen Inverter

Number 2 points to the connection at the back of the Display Panel
Number 6 points to the connection to the Screen Inverter
The Black connector that is not numbered at the bottom, is the motherboard connector of the Display Panel Cable.

This is a better view of the screen Inverter,

http://www.ebay.com/itm/Dell-Inspiron-1420-1421-LCD-Inverter-Backlight-Combo-/370274752470

Display Panel Cable checks out? Look at the screen Inverter. This small circuit board is located at the bottom of the Display Panel, and behind the Display Bezel. Closer look at link listed above.

Is the cable coming from the Display Panel Cable, plugged in tightly to it?
Does the screen Inverter look damaged?

Post back in a Comment, and we will go from there.
Regards,
joecoolvette

Jun 09, 2012 | Dell Inspiron 1420 Laptop

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