I've added more related information in the previous post, as the link to the 5v schematic.

Your motherboard is just a regular board, so all the dm800hd schematics should be usable.

I have some doubts about the cap you have used, it has nothing to do with your issue but it may give scart problems.
Better is to use a cap with a lower loading voltage than the 50v you now use.
Same value as the others.

Thank you very much Jonny,
I got the dreambox with the cap, and had thought about putting another cap
I have seen the schematic, but I'm a newbie and do not know that I have to measure or check, you can detail me clearer.
http://i57.tinypic.com/igc13b.png

Thank you

This is it?

http://i61.tinypic.com/28t95b9.jpg

Result is 3.32

Tha last picture is the u6 3.3v output side, and that's correct.
On the previous picture, http://oi57.tinypic.com/igc13b.jpg
you can see the 0 ohm resistor R109, the black small resistor with zero mark on it.
This must give on both sides 5v dc.

What is a 0 ohm resistor?
0 ohm resistors are just as fuses, they use them as a bridge and mostly on low voltage outputs.
Anyways, it must give the same value on both sides same as a fuse.

Thanks again. I measured the 0 ohm resistor on both sides and still gives me 0.53v values ...

http://i59.tinypic.com/2mnm5qv.png

I have to change the 0 ohm resistor?

Wait until you have measured it also on these places.
Black is ground spot, other two are the red pen places.
Set your multimeter on vdc mode.
Measure the two red spots.

See image,
http://postimg.org/image/rsez38plz/

Because you had said in your previous measurements that you only missing the 5v.



And this is strange, because with a u6 5v failure you should also not have the 1.3v pin 1 and the 3.3v from the U20 voltage.

Hello Johnny, the two points marked in red the value is 0.5

In that case, assuming you measure it correctly, and based on your information it should be a U6 5v side failure.
This can happen when...

One heavy load on the 5v circuit due a defective part on this circuit.
Or a defective U6 chip.

But could also be caused by a defective part on the U6 section, the 5v side.

The schematic of the u6 you can see by this picture,
http://jb8a8f8.com/support/index.php?attachments/u6-2012-jpg.28/

I advice to check all connection on the 5v side, se if there is no interruption.

Also, check the two (green) F1 and F2 fuses, check if they have the 5v, and on both sides.

Another thing you can do is to remove the R109 0 ohm resistor and see if you get the 5v back on the output from the U6 5v side.
If so, then you have a issue with another part what is connected to this 5v circuit.
But to be sure, remove the sim card if you do this.

But still, it's illogical if you have the pin 1 / 1.2v and pin 4 / 3.3v, while you don't have the 5v.
Normally, these two voltages are also not present by a 5v defect.
This makes the measurements doubtful.
http://jb8a8f8.com/support/index.php?attachments/dm800hd-fault-finder-pinout-2013-jpg.21

Hi Johnny, I think I have not been able to interpret the values ... I tried with another dreambox 800 single network card fails and the values are the same or very similar.
Attached photos

PIN 1,2,3,4
http://i59.tinypic.com/2yweq6d.jpg
PIN 5,6
http://i62.tinypic.com/1z56bgy.jpg

I SEE PERFECTLY 05. not 0,5

Okay, so if I understand correctly, these measurements are from another 800hd receiver, and do provide all voltages.
And it has a network problem.

And, the previous measurements, with a missing 5v measurement is another motherboard.
Visual problems such as what this receiver still does, is not mentioned yet.

Is this correct?

*Box with network problem, see here for any solution.
http://jb8a8f8.com/support/index.php?threads/network-issues.25/

*The box with 5v problem, if it is really true that you miss only the 5v from the U6..
See the previous message, the removal of the 5v 0 ohm resistor.