Dell Inspiron E1505/6400 LCD flicker

A few days back a thick pink band started appearing on my dell lcd. This caused my pictures to appear bad, but i was still using the laptop. A few days later the laptop screen started displaying poor artifacts, flickering and blanked out after a while. All through when connected to an external montor the display was perfect.

Today i replaced the LCD, inverter and video cable with those i pulled from another working inspiron e1505 (my friend's).

While the pink band is gone on my e1505, the poor display artifact, flicker and blanking out continues.
When i boot up the Dell logo will appear some times and the display will flicker all the way till i land on log on page. Once i select the user and land in the desktop screen will blank out after a while. All through the picture i seen on the lcd is of poor quality.

The display is perfect on external monitor even now.

Here are some details about my laptop.

Windows 7 Home Premum -Version 6.1.7600 Build 7600 (about a year back upgraded from xp professsional)
Processor Genuine Intel(R) CPU T2080 @ 1.73GHz, 1733 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Dell Inc. A14, 4/2/2007
SMBIOS Version 2.4
NVidia GeForce Go 7300 display adapter

The old LCD was an AU OPTRONICS B154EW01 15.4 LCD
The new LCD is a Samsung taken from my friends e1505.

I have checked the connections multiple times. Please let me know what could be causing the poor lcd display.

Should i be using the old inverter connected to the faulty lcd instead of the one that come attached with the working lcd ?
Should i reinstall my OS from an old image ?
Should i change my NVidia graphics card ? (Does the good external display rule out this)

As mentioned the LCD, inverter and video cables are from a perfectly working laptop running XP media center os.

Any advice in debugging this through to identify the cause is very much appreciated.

 

Try change the nVidia graphics card.

edit: you mentioned that output to external monitor was not affected...

 

Yes. The external display is very good. Does that rule out a problematic graphics card. Do you still think Graphics card could some how be faulty.

I do not have a replacement card readily available, else i would i have tried it. If something strongly points to GC i will goahead and buy it. Please let me know.

I assume this configuration does not have a integrated video out put. Some one please confirm.

 

If no problems are seen on an external display from system power up to shut down, then the graphics card is probably not at fault. Your troubleshooting points to a problem with the video connector on the motherboard (or the motherboard itself).

Does your LCD assembly work fine in the other laptop?

 

I will check if the LCD assembly works in the other laptop. Thanks for your input.

 

Yes the lcd assembly works great with the other laptop..any suggestions on where to go from here ?? anyone ??

 

It's probably the motherboard then, more specifically, the LCD cable connector. I don't know if you'll be able to see any damage with it, but it's probably not repairable.

 

I replaced my nVidia 7300 graphics adapter with ATI X1300. This fixed the flicker issue. Now the laptop works great !

Thank you !!