Sure, that would be great, I'll PM you with shipping details.
Been working on the A6 boards, they're weird: If the controller board in the box becomes unplugged from the boards they go into thermal overdrive, you can see at least one chip on each side going low resistance and heating up a *LOT*. The problem with the A6's at the core is that they built the boards without any sort of compensators. For example on the Antminers (with one exception) the boards have a set of FETs, a choke, and a programmed voltage of between 9.6 (Antminer S9) to 10.5 (Antminer S7) then they run the chips off that. Stable, and can handle chips that might go slightly off in terms of resistance.
On the weird S7's with lots of chips, and the Avalon A6's they run them straight off the power supply, 20 chips per string on the A6. Thus each chip normally gets .6 volts, but if a chip gets warmer than its neighbors, the resistance on that chip goes down and very bad things happen. Bad means the chip has a lower resistance meaning it gets more volts+current=more watts=more heat which means more current. Thus they can get hot enough to melt the solder, make balls, and short out/shut down. Bitch.
Moral: Ensure your chips are ballasted.
Topic: AVALON 6 CURRENTLY (Read 4141 times)
Hey C,
Interested in a broken Avalon A6?
Control board and one hashing board definitely burned, the other hashing board i can't say.
I'll sell it to you for the cost of shipping if interested.
I like your repair attempts, i feel like eating popcorns waiting for updates
Interested in a broken Avalon A6?
Control board and one hashing board definitely burned, the other hashing board i can't say.
I'll sell it to you for the cost of shipping if interested.
I like your repair attempts, i feel like eating popcorns waiting for updates
Reflow oven is a bitch on wheels. I have been reflowing old broken Titan and Neptune boards, problem is the soft components (caps and plugs) melt. Working on ways to fix that.
Meantime I have something equally cool, predator vision. I'll post a pic in a bit.
C
Meantime I have something equally cool, predator vision. I'll post a pic in a bit.
C
Yeah it should be interesting to get this set up. Should be here by next weekend.
The big problem with these A6 boards is that there are a lot of parts on the underside of the board, thus it is very difficult to pre-heat them enough to use hot air to reflow the chips without having components fall off. An oven will allow me to reflow far more evenly with the chips down and the various heavier components on the top.
We'll see how it works.
C
The big problem with these A6 boards is that there are a lot of parts on the underside of the board, thus it is very difficult to pre-heat them enough to use hot air to reflow the chips without having components fall off. An oven will allow me to reflow far more evenly with the chips down and the various heavier components on the top.
We'll see how it works.
C
lmfaooooo
bigger the better
bigger the better
However that doesn't mean I give up: I just bought a reflow oven before the end of the year, will use that to try and re-seat all of the hashing chips before throwing in the beer when it arrives.
Just an excuse to buy bigger tools.
Just an excuse to buy bigger tools.
Nothing works and I had to put it aside for a bit to fix some titan boards. And enjoy Christmas. And eggnog. And stuff like that.....
find any more bad news? LOL
I did buy a new fan for one of em, do you need that? I'd assume thats not an issue right?
No it's not a fan issue. The chips have just been baked.C
I did buy a new fan for one of em, do you need that? I'd assume thats not an issue right?
https://plus.google.com/u/0/photos/116111157305357625600/album/6497260299740327761/6497260300394056018?authkey=CP-r_7PD_vP3swE https://plus.google.com/u/0/photos/116111157305357625600/album/6497260299740327761/6497260300394056018?authkey=CP-r_7PD_vP3swE
Thank you,
I lower frequency to 400 and I will check in one hour how is running.
I hope my attached pictures work
Thank you,
I lower frequency to 400 and I will check in one hour how is running.
I hope my attached pictures work
Hi lightfoot,
I have similar problem I have 2 AVALON6 one is running steady at 3495GHs, another (purchased from another saler) fluctuate between 19xx and 38xx with avg about 26xx. Any idea or sugestion?
Thank you,
First check the temps. In the advanced tabs under CGMiner_Status, the first temp is inlet and the second and third are temps on each side of the unit. Are temps on sides 2 and 3 about the same?I have similar problem I have 2 AVALON6 one is running steady at 3495GHs, another (purchased from another saler) fluctuate between 19xx and 38xx with avg about 26xx. Any idea or sugestion?
Thank you,
Check for power supply issues, maybe one side is running with an undersized supply. What is your 12v input voltage?
Try throttling down the max frequency to 100. What do you see performance-wise, is it stable?
Set the max frequency speed to 400. You should get around 3.2th or so. See if that is stable.
Hi lightfoot,
I have similar problem I have 2 AVALON6 one is running steady at 3495GHs, another (purchased from another saler) fluctuate between 19xx and 38xx with avg about 26xx. Any idea or sugestion?
Thank you,
I have similar problem I have 2 AVALON6 one is running steady at 3495GHs, another (purchased from another saler) fluctuate between 19xx and 38xx with avg about 26xx. Any idea or sugestion?
Thank you,
question is: does it have you pulling your hair out just yet?
LOL
No not at all, this is fascinating. I'm just putting it in between other paying work, it's good research. LOL
question is: does it have you pulling your hair out just yet? LOL
LOL
lmfaoooo Sure glad I set my pride aside enough and realized I should not tackle this one myself LOL
ohhh wowwww.
I surely sent you 2 beauties huh??? LOL
Duds. Let's look at some pictures....I surely sent you 2 beauties huh??? LOL
This is bad....
This is worse....
Not the only chip either, others were on the way out....
C
ohhh wowwww.
I surely sent you 2 beauties huh??? LOL
I surely sent you 2 beauties huh??? LOL
More bad news on the second one. I took the board apart from side 0 (the one that didn't have the plug ripped out); it has a um... well let's say one chip is burned and several others show signs of the chips delaminating from the carriers....
That would definitely shut down the loop.
Next up will be to try and remove the ribbon cable socket from this board (it's never going anywhere again) and hard-wire it into the one that had the socket ripped off....
C
That would definitely shut down the loop.
Next up will be to try and remove the ribbon cable socket from this board (it's never going anywhere again) and hard-wire it into the one that had the socket ripped off....
C
oregonmines.com (people that sold me the fist one I sent you) simply will NOT respond so it's time for the scam report
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