Display Data cable or connector or LCD problem?

My MBP (Model A1150) boots fine and external display (DVI) works fine all the time, if the DIsplay Data Cable or inverter cable is disconnected from the logic board. Of course, nothing on internal LCD screen (since cable is removed).

My MBP boots fine 10-20% of the times, if both Display Data cable and inverter cable stay connected. In this scenario, the LCD screen display stays almost blank and viewable only if I shine light on it. External display works fine too. Again, MBP does not always boot up fine in this case (I hear half-broken boot chimes 4-5 times)

Could it be the Display Data cable or connector on logic board or on LCD screen or the screen itself? Should I open the LCD screen to check the connectors?

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Background -

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I got this MBP ~4 yrs ago. At the time, it would display fine on 1/3 of LCD screen, while the remaining would show grey/green linings. ~1.5 yrs ago, our IT personnel suggested replacing the LCD screen and did so (as a favor), however, he never got the new screen to display anything and suspected logic board. Not sure what else he troubleshot, but he said that I was better off getting a new one. After running to apple store and not getting any help (out of warranty and not supported), I put this MBP in the closet until last week, when I saw ifixit.com website and started troubleshooting and here we are...

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Result = --- Good news ------ It turned out to be a pinched inverter cable connection (or loose connections) inside the LCD panel. I rerouted the cable a bit carefully and removed/reconnected the connections to the inverter, and voila, LCD panel started getting enough power and it started working. Thanks a lot.

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Connect to an external monitor if there are no video problems it eliminates the VGC (VPU) and logic board as potential problems. If the problems also appear on the external display you'll need a replacement logic board.

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Yes, External monitor works fine (100% when the display data cable stays disconnected).

If the display data cable stays connected (and independent of whether the external monitor is connected or not), powering up the MBP mostly gives half-startup chime (and the chime gets cut off) as soon as a flicker on the right bottom of the LCD panel comes on and both LCD panel and external monitor go blank. I can hear the HDD and fan spinning as usual though.

Only few times (10-20%), MBP would boot fine - full startup chime (instead of half), no flicker etc. The LCD panel would show the screen only if I shined light on it (and at that time, the external monitor works fine too).

Could it be a cabling issue? Which one?

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Someone said they see more bad inverter boards than cables (makes sense the cable is pretty simple connector). As to symptoms and purpose of inverter see this

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Thanks for your response and suggestions. I will try it out.

I wonder if the bad inverter board could cause intermittent booting.

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machead3, Good news - It turned out to be a pinched inverter cable connection (or loose connections) inside the LCD panel. I rerouted the cable a bit carefully and removed/reconnected the connections to the inverter, and voila, LCD panel started getting enough power and it started working. Thanks a lot.

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Raj will be eternally grateful.
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