LCD monitor, white screen with vertical lines

daft question is it the same one as you shipped to him??

Did you disassemble the display all the way down to inspect the connections onto the display itself? or the display driver board? I just worked on a Compaq laptop with LCD problems and the flex cable had just popped off the display driver board in a number of places. It was a soldering problem because I tested some of the components on that same board and stopped because they would just pop off under the slightest pressure. Richard

Yes, same unit. Sorry if I confused everyone.

I stopped just short of removing the panel from it's metal frame. I could see the back sides of the FFCs, where they attach to the pcb, but not where they connect to the panel. They looked prestine on the back so I didn't go any further. Time for more disassembly. Thanks,

-Mac

Okay, complete disassembly. FFCs look okay, at least with visual inspection, on both ends (panel and controller board). Visual inspection of controller board looks okay, not that just looking at it will tell me anything. All ribbon cables, etc, are tight and look good. Okay, I think the conclusion here is that one of the boards got fried. How could this happen during shipping? I don't see any cracks in any of the boards and the housing looks fine. Could the buyer have hooked it up wrong or trashed the unit with the wrong refresh rate or something along those lines? Thanks again

I'm not sure if you get what he's saying, so my apologies for mentioning it again- is it possible the buyer had an identical bad monitor and ripped you off by keeping your good one and sending his duff one back? This unfortunately happens on eBay- people look for someone selling a good item identical to a faulty item they have, then try to return their own garbage to the seller and demand a refund.

They might even go as far as to swap out the insides so on the exterior you're getting the right monitor back with the correct serial number, but the wrong innards- there's just no way of knowing now.

The only way to deal with this is the note the serial number of any electrical items you send out, and if possible make the item tamperproof so you know if they've opened it, ie by getting some labels made up to stick over the screw holes, or filling one of the screw holes with wax.

It seems very suspicious to me that it worked when it went out, and came back faulty. I doubt it could have been damaged in transit- the glass is the most fragile part and that is intact so I have a feeling you've been 'had'.

Dave

No, the wrong refresh rate won't damage a TFT monitor.

Dave

Man, I never would have thought of that! I guess my mind just doesn't work that way. Actually though, I did get the same one back. It has a tiny spot on the screen in the lower right hand corner that looked as if someone had tried to clean it and was a little too aggresive. It's only noticable when the unit is off and the light is just right, but it's there. So unless he swapped the anti-glare... Well, short of having a donor for swapping parts, this ones a gonner. Oh well, live and learn. I do agree though, doesn't seem like a board could go bad in shipping, unless they stacked it on an operating Tesla Coil! Thanks for the help,

-Mac