Latitude D630 - Blank screen (but backlight on)

Hi iLap,

I request you to connect an external monitor and check if there is display on it.

I also recommend you to shut the system down and press and hold the ‘Fn’ key on the keyboard and press the power button.  This will launch Diagnostics on the system, Please reply to this post with the status to assist you further.  

Hi Sujatha,

I have tried an external monitor but it doesn't receive any input. I believe the laptop would need to post and then boot before the external monitor would receive any input? I don't think the laptop is getting past the posting stage?

I have pressed and held down the "FN" key and powered the laptop on. Firstly, all three status lights flash three times and then the middle light (A) keeps flashing while the other two lights stay off. What does this error light sequence mean?

Thanks.

Hi iLap,

I request you to check once again for the LED indicators if they follow any of the patterns given in the below list. As mentioned in the post that ‘Caps Lock’ key is flashing while the ‘Num Lock’ and ‘Scroll lock’ is off does not indicate any faulty part. Please reply for further assistance. 

Hi Sujatha,

The LED indicators do not match any of those patterns? However, I have had all 3 LED's flashing.

When I hold down the "FN" button and power the laptop on, all three LED's flash to begin with before it changes to only the "Caps Lock" key flashing.

Based on the fact that I've tested the other components (HDD, Memory and Display). I believe the fault must lie with the system board?

After doing some online research, I believe that this is a common fault caused by the Nvidia chip on the system board?

Thanks

Hi iLap,

Thank you for all the trouble shooting steps tried. This looks like a motherboard failure.  

Is there an image on an external monitor?

I am also having the same issue.  Back light comes on with no picture.  I ran the diagnostics (Hold the "Fn" Key when powering up)  and I replaced the memory cards  cards and this did not resolve the issue based on the code.  This did not resolve the issue..   Is there anything else that I should try to resolve the issue?

The original Diagnostics indicated NO RAM. I replaced these memory cards and I am still receiving the same error code.

Is it possible that these Memory Ram Cards were faulty? Is that common?

Hi mbart01,

The RAM's might not be faulty here. Try single RAM on each of the slot on the motherboard separately. Also clean the RAM and the RAM slots on the motherboard.

Mohsen,

Try replacing the inverter.

Hi,

I also have a D630 that is a few years old now, and am experiencing the same issue.  Machine boots up, but screen is blank with only backlight on.  I did connect to the external monitor and I do get a normal working experience, so output to the VGA port seems fine and Windows boots up and everything is working fine.  

So, I thought that it must be an issue with the LCD screen.  I ordered a replacement screen from Dell, placed it into the machine, and still same thing, i.e. nothing on the LCD monitor but the backlight.  Am I experiencing an issue with the replaced screen part or could it be something else that is at fault on the motherboard?

One question, is the VGA output to an external monitor circuit completely different than the output to the internal monitor?  Since I am getting good video on the external port, does that mean the onboard graphics module is ok?

Thanks,

Mohsen

I can try that, but that implies the replacement screen was also bad then....???

It also showed me the test running page and then the screen slowly glitches until it went black. Then it made the loud beeping noises. And the cap locks kept flashing is there any advice on this?