Purchased a large number of these laptops and I am having several problems with the touchscreen not working. The laptop doesn't even see the hardware. I reloaded the OS, re-seated all connections and it still does not fix it. With the screens on back order, can anyone tell me if they have had this issue? Out of the 10 I repair a week, 8 are touchscreens not working. Is this a known issue?

I am in the exact situation you described. 1200 of these model laptops purchased recently and am seeing quite a few with this issue. Reloaded OS, reseated connections. Just now replaced a screen on one and still not working! Was hoping to find an answer here but I see no takers yet.

We have the same issue with the srews falling off on about 250 student PCs. We will tomorrow attend a class to note some of the service-tags and then report it to Dells support. We take it for granted that Dell then will fix the problem locally at the school.

Yes! I found this issue too and also escalated it to Dell. A representative sent this to the engineer team as a design flaw. I've changed around 50 of these so far and it has been %100 of my touch screen issues.

The part number to this cable is V2TDT, also, the LED cable is being cut. That part number is XP1JD.

I hope this helps. It has caused me a huge headache.

I kept all the bad cables to give Dell. Also, the rep made me ship 4 laptops with touchscreen issues back to them so the engineers could take a look.

Thanks for the reply.

I raised hell about the screws. Finally, I just told them to send me 2000 and I would change them myself. Dell offered to send someone, but I didn't feel like baby sitting.

Thanks for the part numbers, our tech dept. is making a sharepoint document to note all the part numbers so we can have a better shot at getting the right parts from Dell. Even when using the actual part numbers, it's hit and miss with what you actually get from them. That's another headache though.

We're in a similar situation, purchased 1200 of these laptops and now in negotiations with Dell on the resolution. They've sent us screws but, for them to fix it themselves, they required that all 1200 laptops be brought back to the same place and they'd have some techs fix them all at once. That's just not possible with us so we're hopefully negotiating a deal of sorts with them on some other issues. 

Heard this from my boss but apparently Dell said there was a manufacturing issue and the 3340s were sent with the wrong size screws in the 2 hinge areas on the back cover. they were sent with m2.5x5 size screws but it should be something like m2.5x8 (not sure of exact size but that's my approximation). which explains why so many were missing the hinge screws, if not more.

That's great! We've got confirmation that we will recieve 5 screws per computer, thats 1215 srews for 243 computers. We're right now discussing who should do the service, we think it should be Dell and they are considering who they think should do it.

This was interesting news! They did not say anything about that to us. I don't want us to correct the problem now and then be forced to do it contiually when other screws come loose. If what you've heard is correct that means that these screws has to be replaced!

I feel your pain. We ordered 2400 of these laptops and the majority of repairs have been to design flaws. When I order the touchscreen cable from their support site I just say "Touchscreen cable cut due to design flaw" and select "other" from the parts list and put the part number in. they seem to approve 19/20 times.