mmmichi

Your VU+ Duo 2 suffered from capacitors problem, replace the capacitors and it will back to live.

Got it back from "Repair". They flashed the Original VU+ Image and tested the box and found no errors at all. To be sure they even changed the Sat-Tuner to a new one.

At my home, this piece of #$!§% doesn't work at all now, even HDMI now only works when connected directly to the TV. Through the Yamaha AVR there's no picture anymore.

Yesterday I tried to connect a cable from the Tuner plug's shield to the ground connector on my AVR, and the VU+ worked for several hours.

I thought that I found the problem (insufficient grounding of the satellite cables could irritate diseqc).

Today: Nothing again. I checked the tuner plugs with a voltmeter: 13.x / 18.x Volts if You are switching through the channels.

Finally I bought a new receiver (Edision OS Mega) and it worked out of the box with no problems. It shows even more dB signal strength than the VU+. OK, this is not a calibrated measuring instrument, but there were no block artefacts in the cable channels nor in some of the weaker 28°E channels. 

I will do some tests with the VU+ at other people's dishes and perhaps send it to a repair service for checking.

Thank You for Your help!

OK, I disconnected the HDD and started the box.

Tune OK. After 30 minutes I zapped again through the list, Tune Failed again.

I zapped in Satfinder plugin through transponders and sats until a channel locked again.

Then I started a manual service scan on each satellite. Some channels are gone, e.g. on 19.2E no "ZDF*" channels, but e.g. on 28.8E "3sat" or "1-2-3tv" which is found normally on 19.2E.

The faulty receiver is a Duo2, the working receiver is a Solo2.