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iLap
Copper

Latitude D630 - Blank screen (but backlight on)

Looking for a second opinion on a fault with my laptop.

When I switch it on, all I get is a blank screen with the backlight on. The HDD, Bluetooth and Caps Lock lights all come on and the I can hear the CD/DVD powering on and the fan spinning but nothing happens. I get nothing onscreen as if its not posting/booting.

I have tried powering the laptop on with the battery, HDD and memory DIMMs removed but made no difference. I have also reseated those components as well as the display cable but that made no difference.

If I power on the laptop while holding down the "D" key, the screen turns various colours so I believe the screen/inverter isn't at fault.

I think this fault points towards the system board being at fault? Does anyone else think this?

One thing I recall is that before I turned it off, the laptop froze briefly and the display had faint thick pink lines going down it? Is that relevant?

Any guidance is much appreciated!

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30 Replies

Re: 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.  

Thanks and Regards,
DELL-Sujatha K
Dell Social Media and Community Professional
#iwork4Dell
Order Status
Download Drivers

iLap
Copper

Re: Latitude D630 - Blank screen (but backlight on)

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.

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Re: Latitude D630 - Blank screen (but backlight on)

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. 

Thanks and Regards,
DELL-Sujatha K
Dell Social Media and Community Professional
#iwork4Dell
Order Status
Download Drivers

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iLap
Copper

Re: Latitude D630 - Blank screen (but backlight on)

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

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Re: Latitude D630 - Blank screen (but backlight on)

Hi iLap,

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

Thanks and Regards,
DELL-Sujatha K
Dell Social Media and Community Professional
#iwork4Dell
Order Status
Download Drivers

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mbart01
Copper

Re: Latitude D630 - Blank screen (but backlight on)

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?

 

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ejn63
Diamond

Re: Latitude D630 - Blank screen (but backlight on)

Is there an image on an external monitor?

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mbart01
Copper

Re: Latitude D630 - Blank screen (but backlight on)

No,  That screen is also blank..

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mbart01
Copper

Re: Latitude D630 - Blank screen (but backlight on)

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?

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