09-13-2016 05:59 PM
DV4 2170US Laptop
Goes through boot sequence, but screeen never comes on, or even flickers. It can't be the video crd, since an evternal HDMI monitor works just fine.
I already tried removing the battery and cord, and draining residual power.
The laptop crashed during a Microsoft update on Feb 10, 2012, and I am trying to resurrect it for an online course, since the specs are pretty respectable.
Do I need to use my USB Flash Restore drive, reset the system (I backed everything up while connected to the external screen) and see if that fixes it?
Is it just a video driver I am missing?
Is the cable delivering data to the screen bad?
The screen looks like it did when I first bought it, no chips, cracks or scratches, so I doubt it is physically damaged, but...
09-14-2016 09:56 AM
Thank you for visiting the HP Forums.
I have check on the HP Pavilion dv42170us Notebook having an issue with the LCD screen. Yes, you are right it is not the graphics card. This could be the inverter cable on the LCD screen. This is easier to replace and the least expensive. Here is a link to your service manual page 4-40 that shows parts and how to.
Let me know how this goes.
To show appreciation for my efforts kindly click the Thumbs Up below.
09-14-2016 10:43 AM
You need to check page 4-26 of the service manual.
09-14-2016 11:13 AM
Your Display starts at 4-27 it shows the components for removal.
09-14-2016 11:19 AM
Your first message said this was "easy to replace". It seems I have to remove at least half a dozen other components to get to the cable!!
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first disconnecting the power cord from the AC outlet and then disconnecting the AC adapter from the computer.
4. Remove the battery (see “Battery” on page 4-7).
5. Disconnect the wireless antenna cables from the WLAN module (see “WLAN module” on page 4-15).
6. Remove the following components:
a. Hard Drive cover (see “Hard Drive” on page 4-8)
b. Mini Card compartment cover (see “RTC battery” on page 4-12)
c. Optical drive (see “Optical drive” on page 4-19)
d. Keyboard (see “Keyboard” on page 4-20)
e. Keyboard cover (see “Keyboard cover” on page 4-23)
f. Speaker assembly (see “Speaker assembly” on page 4-26)
1. Turn the computer display-side up, with the front toward you.
2. Open the display as far as possible.
3. Remove the wireless antenna cable from the routing channels and clips and disconnect it from the base enclosure
09-14-2016 11:32 AM
09-14-2016 11:36 AM
I just posted the steps that give basic access to the signal cable.
This seems like I have to remove a LOT of stuff to get to the (possible) problem, and then if I do not put it all back properly, I will have ANOTHER problem.
I have changed out RAM, hard drives, and optical drives on laptops, but mainly work on desktops.
09-14-2016 11:43 AM
I would take the Notebook to a repair center for help.