troubleshooting Question

Display screen faint on HP Pavilion dv4-1220 entertainer laptop

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CaptGR asked on
Laptops Notebooks
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Am working on customer's HP Pavilion dv4.  Works fine except no backlight.  I saw it was difficult to replace backlight on this model and instead changed entire screen assembly for a new one.
To be safe I changed the inverter board as well.
    NOW, I get exactly the same problem as before!  NEW screen w/backlight, NEW inverter and still only a faint image using flashlight.  Display is perfect on external monitor!
     Lighted HP logo on outside of lid flashed on and off erratically both before and now.
I've ordered a new main video cable, but doubt this will have any effect.  Any ideas on this?
Someone else on another forum suggested the main video cable change.  Frustating!
Thanks for you help.
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