When Intelpenny's LNBF was sent in under the RMA, it was obvious that the LNBF had been exposed to an electrical event and had sustained damage to the PCB and several components. An IC was melted, light gauge (fuseable link) wire connecting the probe to the PCB replaced and flash marks inside the cavity.
I believe that there was two separate problems that happened in that thread. The first was resolved when a fitting was replaced and the second was later with an electrical event. It was impossible to determine the exact sequence of damage as Intelpenny had attempted repairs to the PCB.
Well, it appears that my two different sat receivers are
coupling lnb voltage
THROUGH my powered Blue Jeans Cable 5x1 HDMI switch I bought through Amazon years ago, which is how I've been switching them into the HDMI port #3 on my LG tv set. MicroHD is on port 5, and the Amiko H.265 is on port 1 of that switch. The switch is powered with it's own power brick, that's plugged into the same 3-way outlet that the Amiko is plugged into. Ultimately, they all go back into a 1500watt UPS.
If I pull the HDMI video cables on each receiver, I no longer get spurious voltages where they shouldn't be.
Based on Brian's test in post #41 of Intelpennys thread here's what I got. The first numbers before the "---" I used as spacers are what Brian got at his test bench. Mine follow the multiple "---"'s. The middle set of numbers are MINE with BOTH hdmi cables CONNECTED to the back of each receiver. The last right-hand set of numbers are MINE, with both HDMI cables REMOVED from the back of each receiver. All other parameters are set as Brian lays out. In my case, these are the receivers. This also explains why the MicroHD was fine by itself originally yesterday morning, until the hour or so later when I turned ON the Amiko receiver (which had been OFF for several days, so probably drained off any spurious voltage by then, as this issue isn't new, but has been extremely intermittent. In fact I sent a PM to Brian on this past Monday, when I first noticed it after trying an unpowered switch out at the dish. But I had to wait more than a day to do the voltage tests, and by then it all was working fine again...:
Amiko H.265 is STB1
SatAv MicroHD is STB2
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#1 Test: Two STBs set to vertical polarity with switching power supplies connected to the same power strip (no ground on power supply AC/DC transformers). Two 3' coax cables each connected to one STB. Multi-meter voltage test between unloaded coax cables. Ground source is the plate cover screw.
STB 1: Center1 to Braid1 - 13.77Vdc ------------- 13.88Vdc --------- 13.86Vdc
STB 2: Center2 to Braid2 - 13.81Vdc ------------- 13.98Vdc --------- 13.99Vdc
Center1 to Center2 - 0Vdc ---------------------------- 0Vdc -------------- 0Vdc
Center1 to Braid2 - 0Vdc ---------------------------- 13.89Vdc --------- 0Vdc
Center2 to Braid1 - 0Vdc ---------------------------- 13.96Vdc --------- 0Vdc
Center1 to Ground - 27.5Vac ------------------------ 29.9Vac ----------- 29.8Vac
Center2 to Ground - 27.6Vac ------------------------ 29.9Vac ----------- 29.9Vac
Braid1 to Ground - 27.5Vac ------------------------- 0Vac---------------- 0Vac
Braid2 to Ground - 27.6Vac -------------------------- 0Vac---------------- 0Vac
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I do have another HDMI switch I've never used, that's a different brand that might not have this issue. As for the C2W-PLL LNBF, I'm not yet sure if that second port is now blown forever or not, but it may be. Once I get the spurious voltage issue between the receivers sorted out, I'll test that LNBF individually with each receiver.