» Was haltet Ihr vom Dell XPS 15 (L521X)

Zitat

Well the engineer has gone away now.

We tested the following:

1. Removed the bottom cover and the DIMM on the bottom
   - No improvements
2. Removed the bottom cover and placed DIMM back, exchanged 6235 card for a 6300
   - Worked, but nu improvements
3. Removed the bottom cover and removed also DIMM, exchanged 6235 card for a 6300
   - No improvements
4. All the above with webcam cable disconnected
   - No improvements
5. Replacement 6235 card with all above scenario's
   - No improvements
   
   And now comes the weird part:
6. New screen + antenna placed aside the laptop, so cables not guided through the notebook
   - Totally different and great performance!!! Like it supposed to be
7. Fitted new screen + antenna part on the notebook and guided cables through the housing
   - Same as points 1 till 5, so back to old...
   
   All test were without the bottom cover. And with the bottom cover fitted on the laptop it just get's worse...
   
   So it seems that the housing is the problem, I think something with RF interference or something? The Dell technician was totally frustrated about this problem and ( lucky ) he wanted to find out the problem. He escalated the problem now to his contact at Dell and gave also all this information.

Zitat

To make it more clear I made some pictures of the testing today.Location of the WiFi card:


As you can see, on this pic I removed the SO-DIMM and you as you can see the antenna cable goes to the back and from there it runs against the housing to the other side of the laptop to go to the hinge.

Test with the new part ( new screen with antenna ):


As you can see we placed the new screen/antenna next to the notebook. Cables run directly from the hinge of the screen to the WiFi card. This is how everything worked well!

Detailed pic of the testsetup with 'external antenna':


Complete teardown of the laptop to place the antenna cable on the right place, the motherboard also needs to be removed otherwise the cable cannot be placed correctly:


Antenna cable is on the right side of the laptop, this was just before the placing of the cable to the left ( bottom perspective ).

Zitat

Giving up.

Engineer was here for over an hour, we tested the following:

• Cable with a bow out the housing
• Shielded cable with aluminium foil
• Ferrite coil around the cable ( as it supposed to be )
• External display connected, laptop lcd disconnected, including webcam
  
  NOTHING HELPED!
  
  So there is somekind of interference when the lcd/antenna is mounted to the base, but I don't have any more idea left.

Mach mit!