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Hello Guys,
I'm new here. I didn't read all the 78 pages...to much, but get the same problem discussed on page 78 - different core voltage.
I'm using a Raspberry Pi3 with Raspbian Stretch. Installed succesfully cgminer (vthoang) and driver, as described in the Gekko 2Pac manual. I have 2 Gekkoscience 2Pac available.
Regarding the power consumption, I'm using an older frontpanel 10xUSB2.0-hub, which I customized to connect it directly to a external power supply. Data connection is soldered to connect to Raspberry USB. I checked every USB-connector of the Hub via Memorystick to the Raspberry, every connector works (data connection is present).
Additionally, I soldered separate power wires on the USB-Jack of the 2Pac's (on the solder pins on the 2Pac-Board). So I can connect the 2Pacs directly to the power supply - no bad connection resistances over the USB-Hub and so on. The power supply is at the moment a laboratory power supply, which can support 3.3A maximum.
I'm starting cgminer with plugged off 2Pac's. After the start, I plug in one 2Pac (hotplug, but first plug in connection to power supply). 2Pac gets recognized and starts working, for example at 200MHz (LED flashes). When I measure the vcore on the two capacitances, I have 2x0.67V (symmetric, only small diffenerence of 0.02V). Single miner works stable during the night with no hardware errors.
When connect the second 2Pac only on the power supply, I can measure also a vcore of 2x0.67V (symmetric). Then I plug in the USB-connector to the hub (data connection). 2Pac gets recognized, but after some minutes he is named as ZOMBIE. When I measure then the vcore, I measure 0.52V and 0.88V for example, a total asymmetric behaviour. Why? Is there a problem with the voltage regulator or some single items on the board (capacitance, resistor, diode)?
When I plug off this stick from the Hub and from the power supply and connect it only to the power supply (after some minutes), the vcore is still asymmetric. Only after a longer time, vcore is symmetric again.
I marked the 2Pacs with numbers - #1 and #2. I tested it in different sets. When #1 is plugged in and works, #2 gets into Zombie with asymmetric voltage. When #2 is plugged in and works, #1 gets into Zombie with asymmetric voltage. Seems to be no hardware issue on the sticks... some kind of software failure.... I will also test a more powerful power supply - but current limit was not detected yet (2.98A with two sticks at start).
Read a lot of this issue here in the forum and the internet, but there seems to be no solution, yet.
I'm new here. I didn't read all the 78 pages...to much, but get the same problem discussed on page 78 - different core voltage.
I'm using a Raspberry Pi3 with Raspbian Stretch. Installed succesfully cgminer (vthoang) and driver, as described in the Gekko 2Pac manual. I have 2 Gekkoscience 2Pac available.
Regarding the power consumption, I'm using an older frontpanel 10xUSB2.0-hub, which I customized to connect it directly to a external power supply. Data connection is soldered to connect to Raspberry USB. I checked every USB-connector of the Hub via Memorystick to the Raspberry, every connector works (data connection is present).
Additionally, I soldered separate power wires on the USB-Jack of the 2Pac's (on the solder pins on the 2Pac-Board). So I can connect the 2Pacs directly to the power supply - no bad connection resistances over the USB-Hub and so on. The power supply is at the moment a laboratory power supply, which can support 3.3A maximum.
I'm starting cgminer with plugged off 2Pac's. After the start, I plug in one 2Pac (hotplug, but first plug in connection to power supply). 2Pac gets recognized and starts working, for example at 200MHz (LED flashes). When I measure the vcore on the two capacitances, I have 2x0.67V (symmetric, only small diffenerence of 0.02V). Single miner works stable during the night with no hardware errors.
When connect the second 2Pac only on the power supply, I can measure also a vcore of 2x0.67V (symmetric). Then I plug in the USB-connector to the hub (data connection). 2Pac gets recognized, but after some minutes he is named as ZOMBIE. When I measure then the vcore, I measure 0.52V and 0.88V for example, a total asymmetric behaviour. Why? Is there a problem with the voltage regulator or some single items on the board (capacitance, resistor, diode)?
When I plug off this stick from the Hub and from the power supply and connect it only to the power supply (after some minutes), the vcore is still asymmetric. Only after a longer time, vcore is symmetric again.
I marked the 2Pacs with numbers - #1 and #2. I tested it in different sets. When #1 is plugged in and works, #2 gets into Zombie with asymmetric voltage. When #2 is plugged in and works, #1 gets into Zombie with asymmetric voltage. Seems to be no hardware issue on the sticks... some kind of software failure.... I will also test a more powerful power supply - but current limit was not detected yet (2.98A with two sticks at start).
Read a lot of this issue here in the forum and the internet, but there seems to be no solution, yet.
I had this problem (one stick going zombie when I plugged the next in) with the 12 port hub i built and was able to solve it by adding caps just before power gets to the 2 pac to combat the voltage drop from plugging them in. This also reduced my hardware error rate as well.
I now have 12 2pacs running for a week at 350 mhz.
