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1  Bitcoin / Hardware / Re: Dragon Miner A1 module hashing at unusual amounts on: October 02, 2015, 03:33:05 AM
I might pm him but yeah at this point I'm kinda tired of messing with it. I may just run it with 3. Thanks for the help though.
2  Bitcoin / Hardware / Re: Dragon Miner A1 module hashing at unusual amounts on: September 29, 2015, 08:46:24 PM
UPDATE: Tested the LDOs, they were outputting the right amount of voltage on both of them. Is one of the ASIC chips bad then?
3  Bitcoin / Hardware / Re: Dragon Miner A1 module hashing at unusual amounts on: September 27, 2015, 09:24:53 PM
Quote from: J4bberwock on September 27, 2015, 09:22:01 PM
Quote from: dako44 on September 27, 2015, 08:44:55 PM
Quote from: J4bberwock on September 27, 2015, 08:28:11 PM




here is the datasheet of the LDO chips:

http://www.advanced-monolithic.com/pdf/ds1117.pdf

I didn't check the pinout, but it's very likely that they are compatible with ncp1117, ncv1117, and many other "1117" LDOs, all outputting 1A.
But first, you'll need to check if the Vout is out of specs.
Center pin is the vout.
Most of the time, you can use almost any screw from the heatsink as a ground reference (or simply use pin 1 of the LDO).

I'm not too familiar with the dragon units, but I'm not sure the LDOs are at fault, maybe just the asics that went bad.
from what I remember (but I may be wrong), the I/O are all chained together. I don't know what will happen if one chip in the chain fails.

So to clarify, test the chips to make sure they are outputting 1.8 and 3.3 volts respectively, then go from there.

And it shouldn't matter on the model as long as it is 1.8V and 1A or 3.3V and 1A?

you need to check pinout of the part you plan to buy:
pin1 = gnd
pin2=Vout
pin3=Vin

NCP1117, NCV1117, LD1117A, LT1117 are compatible if yours are sot223 package

but first, check voltage output


Alrighty! Thanks for the help. Smiley
4  Bitcoin / Hardware / Re: Dragon Miner A1 module hashing at unusual amounts on: September 27, 2015, 08:44:55 PM
Quote from: J4bberwock on September 27, 2015, 08:28:11 PM




here is the datasheet of the LDO chips:

http://www.advanced-monolithic.com/pdf/ds1117.pdf

I didn't check the pinout, but it's very likely that they are compatible with ncp1117, ncv1117, and many other "1117" LDOs, all outputting 1A.
But first, you'll need to check if the Vout is out of specs.
Center pin is the vout.
Most of the time, you can use almost any screw from the heatsink as a ground reference (or simply use pin 1 of the LDO).

I'm not too familiar with the dragon units, but I'm not sure the LDOs are at fault, maybe just the asics that went bad.
from what I remember (but I may be wrong), the I/O are all chained together. I don't know what will happen if one chip in the chain fails.

So to clarify, test the chips to make sure they are outputting 1.8 and 3.3 volts respectively, then go from there.

And it shouldn't matter on the model as long as it is 1.8V and 1A or 3.3V and 1A?
5  Bitcoin / Bitcoin Technical Support / MOVED: Dragon Miner A1 module hashing at unusual amounts on: September 27, 2015, 07:51:47 PM
This topic has been moved to Mining Hardware.
6  Bitcoin / Hardware / Dragon Miner A1 module hashing at unusual amounts on: September 27, 2015, 07:11:38 PM
To make a long story short, I've got this Dragon Miner A1. One of the modules says it hashes at 750gh, but in reality it just isn't working. So, I did some research and found out that one of the VRM chips is probably bad (If my theory is wrong please correct me) and needs replacing. So the module apart today and discovered 2 VRM chips, one is a 1.8V and the other is a 3.3V. They have writing on them and I searched it up and found some, but the last string of numbers is different on all of them. Does the last string of numbers matter? I am also not currently sure of the amperage on the original chips. So if anyone knows that info please share that with me.

The 1.8V one is as follows: AMS1117 1.8V H418KE
The 3.3V one is as follows: AMS1117 3.3V H421PE

If the last set of numbers matters could someone tell me what they mean?

Thanks,
dako44
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