Dell Latitude 620 no video display

I have a Dell Latitude 620 with no video display. I can attach an external monitor and I can see the display on the external monitor with vertical lines and some distortion on the display.  If I reboot on safe mode I the video will be clear with horizontal lines running up and down.  I replaced the LCD Inverter and that did not correct the problem.
Because of the horizontal lines on the exertal monitor I'm suspecting a problem on the video on the motherboard. How can I find out if the problem is on the LCD display or the video chip on the motherboard?
armandocgAsked:
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Raymond PengSystems EngineerCommented:
Run the onboard Dell Diagnostics or from a Dell Boot CD.  This will test the hardware.  If sounds like the video controller so in this case, you'll need to replace the mobo.  If outputting to monitor has issues, most likely it's a controller issue.
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jamietonerCommented:
Where the issue occurs on an external monitor the video chip on the motherboard is most likely the cause.
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Grant1842Commented:
Please see my article here on EE on how to diagnose your video.
http://www.experts-exchange.com/Hardware/Laptops_Notebooks/A_3546-Diagnose-your-video-problem-on-your-laptop.html

It seems like an on board video chip problem.
I have re flowed the video chips on laptops with these symptoms you describe and it has fixed the problem with out having to replace the MB.
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nobusCommented:
i agree with Jamietoner, since you posted " I can see the display on the external monitor with vertical lines and some distortion on the display"
so this shows it is not the LCD
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CallandorCommented:
If you have an nVidia video chipset, you probably have the infamous defect that prompted a recall: http://en.community.dell.com/blogs/direct2dell/archive/2008/08/18/nvidia-gpu-update-dell-to-offer-warranty-enhancement-to-all-affected-customers-worldwide.aspx

This requires a motherboard replacement, or if you are handy, a reflow of the solder joints on the graphics card, as Grant1842 mentioned.  You can do this with an oven http://www.computerrepairtips.net/how-to-reflow-a-laptop-motherboard/ or with a heat gun http://hackaday.com/2011/02/24/heat-gun-gpu-reflow-fixes-laptop/
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armandocgAuthor Commented:
I reflow  the video chip using a heat gun and to my surprise it worked.
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