DISCLAIMER: BOTH THE 20 AND 35 HAVE DIED.
Overhauling Spondoolies Bit Coin Miners
I own both the SP-20 and an SP-35. Recently they started getting intermittent,
so I decided to clean them up and do new thermal grease (since that’s about all
you can do when the OEM goes out of business).
These are the steps I took … didn’t use ESD precautions, but I know how
to handle parts, so I was not too worried.
Your mileage may vary.
Make sure you have thermal paste on hand … ArcticSilver is
what I use.
The SP-20 is the hardest to do from the perspective of “how
to take apart” while the SP-35 takes a lot of hours.
The SP-20
For orientation, when the unit is lying on a table, the RJ-45
is at the top edge. So, take out the three
screws at the top of each side and remove the top. Now, you will see two ribbon cables running
into the controller card … slide those off … there are no clips … just pressure
holds them on.
Now with the cables off, take out the next three screws (from
each side) and the sub-assembly that holds the controller card with the RJ-45
connector is now loose … but ... be careful to ensure that the ribbon cables
don’t get in the way as your removing it, and “hinge” it towards the rear as
the rear fans are wired to the controller card.
Once removed, you’ll see the two miner cards in there,
loose. Look at the stamped metal you
removed … there are guides there that the two miner cards go into during
re-assembly … remember them. Now, remove each miner card and set them aside.
Now blow out the chassis metal that’s left … blow off the
controller card assembly, and blow off the miner cards.
For each miner card, remove the heat sinks (2 screws each)
and blow the dust off. Clean the old
thermal grease off the heat sinks with 99% isopropyl alcohol (70% will do, but
99% is best). Then, clean the old grease
off the chips … properly cleaned, the chip tops should look like little mirrors. Never touch either the chip or heat sink with
bare hands … and remember that all surfaces are only clean via an alcohol wipe
down. I used Nitrile gloves to ensure
that no skin oils got on any surfaces.
Apply a small dab of new grease on each chip, and using a
razor blade, spread it out over the entire surface. It goes far so you only need a tiny
amount. Once you spread the compound out
via the razor blade and the top is fully covered, re-install the heat sinks
onto each chip … first screw is turned a few turns to set it, and then the
other screw is fully screwed in. Once the
second screw is screwed all the way in, finish the first. These screws should NOT be tight … just turn
until it stops.
Once both boards are done, re-seat the boards back in place,
in their guides and all way back so their power connectors stick out the
back. Then, put the controller card back
into place, making sure the ribbon cables are routed through their cut outs and
re-connect them.
Now you need to move the boards about a bit so that they
boards are into their proper position.
The controller assembly metal needs a little bit of force to get the
screw holes lined up … the pressure is to ensure that the boards stay in place
during movement. Get each of the 3
screws of each side in … and don’t tighten any until ALL SIX are installed …
and THEN tighten them. Now, put the top
back on and put the last 6 screws back in.
SP-35
Pull the power supplies out and blow them out.
Remove the top via 3 screws in the rear. Once the screws are out, you slide the top
back about ½ inch and remove it.
You have two platters of miner chips … there is a top and a
bottom.
But first, by the power supplies you will see two metal
plates with 4 screws in each. Those
connect (or link) the power supplies to the processor boards. Remove all 8 screws (2x4) and remove the
links.
For the top miner platter, remove the heat sinks (2 screws
each) and blow the dust off the heat sinks.
Clean the old thermal grease off the heat sinks with 99% isopropyl
alcohol (70% will do, but 99% is best).
Then, clean the old grease off the chips … properly cleaned, the chip
tops should look like little mirrors.
Never touch either the chip or heat sink with bare hands … and remember
that all surfaces are only clean via an alcohol wipe down. I used Nitrile gloves to ensure that no skin
oils got on any surfaces.
Now, you will see screws holding that platter down … should
be about 10 of them. Remove those, and
notice that by the power supply is a shielded ribbon cable … remove it … no
clips … pressure fit only. Lift out the
platter and sit it aside.
Same instructions on the bottom platter … remove heat sinks
and blow the dust off. Then clean the
old grease off the chips and sinks. You
can remove the bottom platter if you want … I didn’t.
At this point, you want to blow out the chassis and blow all
the dust off the platters … then wipe the chips off in case any dust got on
them.
Apply a small dab of new grease on each chip, and using a
razor blade, spread it out over the entire surface. It goes far so you only need a tiny
amount. Once you spread the compound out
via the razor blade and the top is fully covered, re-install the heat sinks
onto each chip … first screw is turned a few turns to set it, and then the
other screw is fully screwed in. Once the
second screw is screwed all the way in, finish the first. These screws should NOT be tight … just turn
until it stops. Do this to both
platters.
Re-install the top platter and reconnect the ribbon cable
and the power links. Screw the platter
back in place. NOTE: I found two of the stand offs that the top
platter sit on were stripped out from (I assume) poor production processes … so
I just left 2 screws out as I didn’t want to disassemble and tap the threads.
Install the top and power supplies and you’re ready to rock,
er, mine.
