Where is LCD cable - Compaq Presario CQ56-115DX Laptop

1) Wrong LCD screen

2) Video Cable (LCD Cable) is not connected tightly.
Motherboard side, or LCD screen side; or both.

3) IF, a screen Inverter is used, the small cable from the Video Cable, that connects to the screen Inverter; is not connected, or has a loose connection to it. (screen Inverter)

4) An LCD screen, and a screen Inverter are a Matched unit.
If it's the wrong LCD screen......................?

5) IF, a screen Inverter is used; the diagnosis was wrong, and the LCD screen was replaced.
90 PERCENT of the time, the fault is a bad screen Inverter.

A) Laptop's LCD screen uses a CCFL, (Or more than one), for a Backlight; the laptop uses a screen Inverter.

Diagnostic flowchart leads from Graphics Chipset, to Video Cable, to screen Inverter, THEN, LCD screen.
Expensive LCD screen was replaced, instead of the actual part that needed replacing;
Video Cable: $9 to $22
Screen Inverter: $9 to $22

LCD screen: $60 to $245

B) Laptop's LCD screen uses LED backlighting, and does NOT use a screen Inverter:

Diagnostic flowchart is;
A) Video Cable;
A Video Cable should have it's connections PHYSICALLY checked.
You have to try to push the connectors in tighter.
Visual inspection alone will NOT do.

Making sure the Video Cable connections are tight, and this does not fix the problem, then the Video Cable needs to be removed; and every wire in the Video Cable checked for Continuity with a multimeter set to OHM's. (1K)

Not feasible, then take the Video Cable down to the nearest small computer shop; and have the resident tech check it for Continuity.
Should only be a few bucks.

Or just replace the Video Cable.
(Parts changing I know, but...........?)

Primer:
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 more than one), or a series of LED's.
(Light Emitting Diode)

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

Average thickness is 2mm. That is a little large than 1/16th of an Inch.
Average thickness is almost as long, as the LCD screen is in height.
View the last 8 photos,

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

A screen Inverter is used to convert the power, (Electricity), from the laptop; for the LCD screen, and Backlight.

As previously stated, Backlighting that uses CCFL, uses a screen Inverter.
LED backlighting MAY, or MAY NOT use a screen Inverter.
When the LED backlight technology first came out, it seems some did use a screen Inverter.
It also seems as the technology advanced, LED backlighting does Not use a screen Inverter.

Regards,
joecoolvette

Well, you're not going to fix this without opening up the camera.

The LCD screen should have to wires going to it. One is for the light that illuminates the LCD. That one is obviously working. The other is for the LCD itself - it sounds like that isn't. Either the LCD needs replaced, or that cable is loose or damaged. I'd suggest opening up the camera, finding that cable (it will likely be a thinner cable than the other), and checking for loose connections, or an obvious break or sharp bend in the cable.

Unfortunately, even if you find the cable is damaged, I'm not sure you can get it replaced. If you're not confident you can take this apart and put it back together properly, I'd suggest either taking it to a repair shop, or just using it as is. I'd hate to see you damage it further. If you are confident, however, check that cable. If it's good, contact Samsung about a replacement LCD.

-Dyllan

I would have the old Video Cable (LCD cable), AND the new Video Cable; checked with a multimeter set to OHM's (1K), for Continuity.

An inexpensive multimeter is about $5 to $12 bucks.
Suggest, take both Video Cables down to the nearest small computer repair shop, and have the resident tech check it for Continuity.
Should only be a couple of bucks.

"But it's a new LCD cable"

So?

New LCD cable checks fine, the problem is;
A) You are not getting the LCD screen side of the LCD Cable, plugged in correctly.
It may seem like it is.

Motherboard side connector isn't the usual male plug connector.
Looks simple to connect, but also in the same instance looks like it may be a problem child to connect.
The LCD screen side connector of the LCD Cable, can be tricky to get plugged in correctly.

It can be loose enough at that connection, that it will not make full contact; and your little peepers will not see it.

(Also needs to be re-taped after connecting to LCD screen)

2) LCD screen replacement could be the wrong one, or is a faulty unit.

3) http://www.ebay.com/itm/New-Dell-Inspiron-N5010-M5010-15R-LCD-video-flex-cable-4K7TX-04K7TX-50-4HH01-101-/400479996437?pt=LH_DefaultDomain_0&hash=item5d3e77ca15

With this LCD Cable it looks as though it may be easy, to Not get the motherboard side of the LCD Cable; plugged in tightly, and correctly.

Post back in a Comment, or Reply; at the end of this solution.

Regards,
joecoolvette

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It only means that either the Inverter Cable/LCD cable or the LCD itself is defective, because if you still see the contents of the laptop to an external monitor, then it means that the rest of the computer's components are working.
You can have the Inverter Cable reseated or have the LCD screen replaced. Have it tested by a local technician.

Hi,
Samsung SyncMaster 2233BW does not support TV / Cable input (RF Connector).
If you wish to connect Cable to the LCD, you have to buy a TV Box and connect Cable with your LCD through TV Box. (Cable TV to TV BOX and from TV BOX to LCD)

Hope it helps! Good Luck! Thanks for using Fixya!
CreativeTECH

it isnt that difficult actually , a how to for removing the lcd is shown here

Remove the four screw caps and screws from the LCD Bezel.
NOTE: The two center screw caps at the top of the bezel are for protection only.


Starting from the inside top edge, pry the bezel away from the panel. Continue moving down the sides until the bezel is removed. If necessary, use a plastic pry to release the corners of the bezel.
4. Lift up the bezel and remove it from the LCD Module.
IMPORTANT: If the LCD Bezel is replaced, remove the lid sensor magnet from the bezel, and attach it to the replacement bezel.

1. Disconnect the cable from the Camera Board as shown.

Remove the Camera Board from the LCD Module.

Remove the two securing screws from the LCD Panel.

1. Remove the four securing screws (two each side) from the LCD Panel brackets.

Turn the LCD panel over on a clean surface. Remove the adhesive strips securing the LCD cable.Carefully lift the adhesive tape securing the cable connector to the LCD Panel.
5. Hold the adhesive tape clear of the LCD Panel and disconnect the LCD cable as shown.

1. Remove the adhesive strips holding the MIC cable in place.

3. Remove the MIC Board from the LCD Module.

1. Remove the adhesive strips holding the Camera cable in place.
2. Remove the Camera cable from the LCD Module.

1. Remove the adhesive strips holding the Antenna cables in place.

Carefully pry up the Antenna pads, as shown, and remove the pads from the LCD Module. IMPORTANT: A strong adhesive is used to secure the Antenna pads in place. Take care not to bend the pads during removal.



to fit a new one do the steps in reverse

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This is due to some loose contact of your LCD Cable connection or LCD Panel cable malfunction. Reinsert LCD panel cable in proper way and check else you need to replace the LCD Panel Cable.

the inverter only control the back light this is the bright or dim in the lcd the blurry or funny images would be the lcd or lcd cable the only other thing is the 1 in 100 shot of it being a motherboard issue (video on the motherboard). the best thing to do is take the lcd out and try a lcd from another laptop maybe a friends laptop that uses alike lcd this does not have to be the matching size just matching lcd cable connection. be careful the cable should go on with ease no force if you have to force the cable on to the try out lcd then it will not work.

I am no expert on this issue, but i am not sure you can install a SXGA resolution screen into a formally XGA laptop. Never tried that before. I don't believe that it will work CORRECTLY. As you have stated. Is there anyway you can send it back and get a XGA one instead and solve your problem? Keep me posted.. I am curious about this... THANK YOU ...GURU JAY

Check LCD ribbon cable. 99% LCD ribbon cable is defective. Replace LCD ribbon cable.