Question about HP Pavilion dv2500t Notebook

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HP Pavilion dv2500 no display when power lights not blinking

I tried to use my HP Pavilion dv2500 S-Video socket with the included s-video cable from my desktop's video card. at first when i plug it in i was not using any power adapter and nothing happens. We use 220V input here but I found out that my notebook supports power inputs ranging from 100-240V so it is really not a problem. Since nothing happens when I tried to plug my S-Video Cable to my notebook and there is no display in my TV, I decided to plug the power adapter and suddenly my S-video cable burned to i quickly pull the power adapter and s-video cable. After that, I tried to check my notebook and there is no display and its power lights, etc. are just still and not blinking. Hope you can tell me how to solve it or help me find what has been broken. Thanks!

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Hello

To get the display on the TV . Please press Fn + F4 after connected TV to the Notebook using Svideo cable and the cable should be connected to the Svideo port of the Notebook.

If there is not display on the Notebook after the Svideo cable burns.
Then please perform the following steps.

= Power Drain =

1. Disconnect the AC Adapter.
2. Remove the Battery.
3. Hold the Power button down for 30 seconds to 1 minute.
4. Reconnect the AC adapter and Battery.
5. Turn on the Notebook power.

If the issue persists then check whether the display is same on the external monitor.

I hope this will work.

Thanks

Posted on Aug 24, 2008

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1 Answer

Pavilion DV4 screen wont turn on.(Overnight problem)


Since you have graphics on an external monitor, the problem is the Video Cable, or inside the Display Assembly.

http://h10025.www1.hp.com/ewfrf/wc/product?product=3860431&lc=en&cc=us&dlc=en&lang=en&cc=us

This is a general example of a Video Cable, (Display Cable - HP), for an HP Pavilion DV4 series of Notebook PC,

http://www.ebay.com/itm/NEW-ORIGINAL-HP-PAVILION-DV4-LAPTOP-LCD-VIDEO-CABLE-DC02000IO00-486878-001-14-1-/281038275215?pt=US_Laptop_Screens_LCD_Panels&hash=item416f2fc28f

Mouse over to enlarge

The Video Cable connects to the motherboard in an area under the Keyboard, (About where the Fn key is), routes up along the motherboard, then routes up through the left Hinge, and into the Display Assembly.

From there it connects to the screen Inverter (Display Inverter -HP), and back of LCD screen.
It also connects to the LED backlight.

Either connections are loose, or the Video Cable (Display Cable) is damaged.
If the sheath of the cable shows apparent visual damage, so may be the tiny wires inside. (Stretched/Broken)

Connections CANNOT just be visually determined if they are loose.
You MUST physically check EACH connection.

Tightening connections does no good?
Perform a continuity test with a multimeter set to OHM's, on every wire in that Video Cable.

Have an assistant gently wiggle the cable in the middle, and check for an intermittent reading on the multimeter. Indicates broken wire if intermittent reading shows.

OR,

Take Video Cable to the nearest small computer store, and have the resident tech check it for continuity. Should just be a couple of bucks.

Use an ESD wrist strap, and connect it's alligator clip to a good ground source. (Electro Static Discharge)
Average cost is around $3 to $6.

Here is the download page for the free Service Manual, from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3860431&

Scroll down, click on -
HP Pavilion dv4 Entertainment PC - Maintenance and Service Guide

Page 92 (PDF page at Top) for motherboard side of Video Cable (Display Cable - HP)

Page 80 for LCD screen, and Screen Inverter (Display Inverter - HP), and LED backlight.

Page 82 has false statements.

Remove the display assembly:

1. Locate the wireless antenna cable (1), and remove from path (2)

Should be;
Locate the DISPLAY CABLE (1), and remove from path (2)

2. Disconnect the wireless antenna cable from the system board (3)

Should be;
2. Disconnect the DISPLAY CABLE from the system board (3)

Somebody was on crack that day.

The wireless antenna cable information that follows, is correct.

Video Cable (Display Cable) is on the Left side.
Wireless Antenna wires are on the Right side.

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

Jan 13, 2013 | HP NB199UA Pavilion Notebook

1 Answer

Why does laptop screen flicker and sometimes screen goes black?


If it were I, I or a friend with basic skills, would open the laptop, and check it out myself. Save $$$$$$$$$

JMHO

HP Support > Pavilion dv2910us Notebook PC > Main Support page,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=3747188

Click on Manuals in the right side list.
Scroll down, click on -
HP Pavilion dv2500 and dv2700 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 file name it may take up to 30 seconds, before the first page comes up.
(Took 10 seconds just now using a medium speed DSL connection )

Primer:
An LCD screen cannot produce light by itself. It needs an addtional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.
The HP Pavilion dv2910us Notebook PC uses a CCFL.

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

(Usually 2mm Wide, by, close to the height of the LCD screen)

A screen Inverter converts the power (Electricity) from the laptop, for the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.

The screen Inverter is located behind the Display Bezel, and mounted to the bottom area of the LCD screen.

{The Display Bezel is the thin piece of plastic in Front of the LCD screen, and surrounds the LCD screen, in front }

Example of a Pavilion dv2910us screen Inverter,

http://www.batterycentury.com/hp-pavilion-dv2910us-inverter-p-177051.html

Wires in a cable with a connector on the end, plug into the screen Inverter, and come out of the screen Inverter.
The connectors are different so there is no mixing them up.

A) Remove ALL power. Remove the AC adapter (Charger) and Battery.

B) Follow Anti-Static Precautions.
Work on a table. Not on a bed, couch, or directly on a carpet floor.
If the table is on a carpeted floor, refrain from swinging your feet across it.

If you do not have an ESD wrist strap available, (Average cost $3 to $5),
at least place a large metallic object on the table (Unpainted), and touch it before, and occasionally during working on the laptop.

Perhaps a large metal serving tray (Unpainted), or large metal knickknack. (Unpainted)

C) Now in the service manual, go to the Bookmarks menu on the left side, click on the + sign to the left of -
Removal and replacement procedures

Click on the + sign next to - Component replacement procedures
Scroll the bar down, click right ON - Display assembly

{You can reduce, or increase the view size.
The ( + ) Zoom In icon increases the view size.
The ( - ) Zoom Out icon decreases the view size }

In the instructions anything that is in blue, can be clicked on to take you to more in-depth info, on that subject.

You are looking to see for one, if the Video Cable connections have come loose.
It doesn't take much, and just viewing with the human eye may not discern if it is loose.

The procedure is to physically check, to make sure the connections are tight.
The Video Cable plugs into the motherboard, then routes under the left Hinge, and up into the Display Assembly.
There it connects to the Back of the LCD screen.

{HP:
Video Cable = Display Panel Cable.
LCD screen = Display Panel }

You have to remove;
1) All power,
2) Switch Cover (Page 79 in the page number box, at the top of the PDF file)
3) Keyboard (Page 75)

,and then you have access to the Video Cable connector, on the motherboard side.

You have to remove:
1) All power
2) Switch Cover
3) Keyboard
4) Display Assembly,

and remove the Display Panel far enough from the Display Enclosure, to physically make sure the Display Panel Cable is plugged in tightly.

Opening, and closing the laptop may have pinched the Display Panel Cable (Video Cable), and pulled one, or both connections loose.

Since the Display Panel Cable is also routed under the left Hinge, it can be pinched enough to damage it.
See if there are obvious signs of damage to the sheath of the cable.

Have someone with a multimeter set to Ohms, check the continuity of the wires, in the Display Panel Cable.

{Average cost for an inexpensive multimeter to perform this test, is around $8 to $12.
Available in a multitude of stores. An auto parts store is but one example. Analog or digital is fine. I prefer Analog }

Have an assistant gently wiggle the cable while checking for continuity, to see if there is an intermittent break.
Indicates a broken wire in the Display Panel Cable.

http://www.pelltechnology.com/HP/Laptop/HP-Pavilion-dv2000-Series/dv2900-dv2910us/HP-Pavilion-dv2910us-LCD-VGA-Video-Cable.html

Cable checks out replace the screen Inverter.

[ The test for a screen Inverter uses a sensitive multimeter. Not something everyone has laying around. Most consumers who do not have this tool, replace the screen Inverter,

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

The low cost, and ease of access also helps ]

Display Panel Cable, and screen Inverter check out?
Problem is CCFL, or LCD screen.

http://www.pelltechnology.com/HP/Laptop/HP-Pavilion-dv2000-Series/dv2900-dv2910us/HP-Pavilion-dv2910us-CCFL-Backlight-Bulb-for-LCD.html

http://www.ccfldirect.com/lcdtutorial.html

Continued in Comment.

Feb 19, 2012 | PC Laptops

1 Answer

Hello,I am surya..I have HP dv2500 notebook.I am unable to start my notebook.when i am conecting it by charger..a blue light blinks..but no indicator is blinking..that is no power in the system.Can u...


My friend,

Seems to be there is some problem with the battery .
What you can do is take the battery out and connect the power cable to the computer.
If this works on the ac power this means that the laptop is good and you need to replace the battery of this laptop.



Regards:-

Amit Awasthi

Dec 09, 2010 | HP Pavilion dv2500t Notebook

1 Answer

Hi, I have hp pavilion dv2500 laptop. I have display problem.pls help how to rectify it. If i connect exteranl CRT monitor Display is coming . Pls tell me how to disassemble the laptop.


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.

In this service manual, you will find an illustration of how to disassemble the laptop & replace either the LCD cable or screen inverter board:
http://h10032.www1.hp.com/ctg/Manual/c01295820.pdf

Sep 17, 2010 | HP Pavilion dv2500t Notebook

1 Answer

The screen on my laptop doesn't work. I'm able to


best advice would be to replace the screen it appears that the back light has failed you could probably find one on www.ebay.co.uk reasonbly cheap

Jul 20, 2010 | HP Pavilion dv2500t Notebook

1 Answer

Blank screen,pwr sup appears to ok, fans runs, pwr light on


The issue seems to be due to defective video card on the notebook. Connect and external monitor to the PC and check if it works fine or not. You can follow the steps listed below to connect an external monitor.

1. Turn off the notebook.
2. Connect the monitor cable from the external monitor to the monitor port on the rear/side of the computer.
3. Connect the monitor to a power source and turn it on.
4. Press the Power button to turn on the computer.

At this time, please follow the instructions mentioned below for switching the display to the external monitor:

The notebook's video card supports three modes. Built-in screen only; external video only; and both on simultaneously (mirrored). If you're not seeing the image on the desired device(s), the notebook's video card is probably in another mode. Press FN + F4 to cycle through the display options: Notebook display, External monitor, both.

If you press FN + F4 once, the external monitor will display & there will be no Notebook LCD display.
If you press FN + F4 twice, the external monitor will display & there will be some shading on the Notebook LCD.
If you press FN + F4 thrice, both Notebook LCD & external monitor will display.

If the issue persists on the external monitor, then this could be due to defective video card on the notebook. However, if the display on the external monitor is fine, then the issue is with the LCD display panel of the notebook. In either cases, the notebook requires a detailed onsite diagnosis by a service technician.

If your PC is under warranty, contact HP to get available options to get the notebook repaired under warranty.

May 26, 2010 | HP Pavilion DV2500T 14.1" NOTEBOOK LAPTOP...

1 Answer

Changed the display now the laptop will not turn


Please visit http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01087277&lc=en&cc=us and follow the steps. Contact HP and see if you model is on the affected list, as it could be eligible for a free motherboard replacement to resolve the defective video card issue. If they say no, check out www.hplies.com for other useful information regarding this Globally known issue with nVidia and HP.

Oct 23, 2009 | HP Pavilion dv2500t Notebook

1 Answer

Hp dv2500 wont turn on


does the laptop plug in tightly to the power socket

if not the pavilion part to get the system power needs replacement

contact a local technician and state the power adapter plug-in on the motherboard needs replaced

these commonly go bad on pavilions

it should cost you less than 100usd to repair

or rma the laptop if you have warranty coverage left on the hp dv2500

good luck

Sep 28, 2009 | HP Pavilion dv2000t 14.1" Notebook Laptop...

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