Antminer S15 Maintenance Manual

Doc. Version: 2019.07.02
Doc. Category: Maintenance Guide
Content of This Doc.: mainly about the fault checking and hashboard tester pinpointing of Antminer S15.
※ The copyright of this article belongs to Bitmain. The article shall solely be reprinted, extracted or used in any other ways with the permission of
the copyright owner. Please contact Bitmain official customer service if there is any need of reprinting or quoting.
I. Maintenance Platform Requirements
1. Thermostat soldering iron at 300-350 degrees Celsius, pointed solder tip for small patches like r-c.
2. Heat gun for chip disassembly and soldering, no long-time heating in case of PCB blistering (the soldering temperature shall be 260± 2 degrees Celsius).
3. APW8 power source with 16.32V-20.04V output to test the hashboard.
4. Multimeter, tweezer, V9-1.2 hashboard tester (oscilloscope preferred).
5. Scaling powder, cleaning water and anhydrous alcohol; cleaning water is used to clean the residue and appearance after maintenance.
6. Tin grinder, tin stencils, and tin cream (low temperature OM550); implant tin for chips upon renewals.
7. Heat-conducting Glue, black (6223), to glue cooling fin after maintenance.
II.
Maintenance Requirements:
1. Maintenance technician in possession of good electronics knowledge, 1 year+ experience and sound mastery of QFN encapsulation and soldering
techniques.
2. Check more than two times after maintenance and the result of each time is OK!
3. Watch out for the techniques used, make sure of no obvious PCB deformation after changing any fittings, check for missing/open circuit/short circuit on
parts.
4. Check the maintenance target and corresponding test software parameter and hashboard tester.
5. Check whether tools and testers can work properly.
III. Principle and Structure
● Principle Introduction
1.S15 has 12 voltage domains connected in series, each domain has 5 BM1391, and the entire board has 60 BM1391 chips.
2.BM1391 chip has 3 built-in small voltage domains which are connected in series.
3.BM1391 has 12 voltage domains; S15 has 25M monocrystal oscillator on the clock, connecting in series and passing on from the 1st chip to the last chip.
4.S15 has independent small cooling fins on the front and back of each chip. The cooling fin on the front is SMT paster and the cooling fin on the back is
fixed on the back of IC by heat-conducting glue after initial test. Upon completion of every maintenance, it has to be fixed by black heat-conducting glue
(evenly distributed) on the back of IC.
5.Power supply of S15 is APW8, the output of it is regulated by the control panel. The normal voltage is 220V, there will be no output of APW8 without a
control panel to regulate the voltage.
Note:
In the process of maintenance, when changing board fittings or chip, in order to avoid the damage to PCB and chip caused by the heat from the blower gun,
cooling fins near the malfunctioning part and the cooling fin on the back of PCB need to be removed firstly before conducting fitting changes.
PCB has test points on both sides, use the front one during maintenance in production before fitting cooling fin on the front; in product maintenance (after-
sales maintenance), cooling fins are on both sides of PCB, locate fault through test points of PCB, and use specially made long and thin pen-shape meter to
probe into the gaps of cooling fin for test; because the SMT small cooling fins connect the ground of each voltage domain, watch out the insulation of pen-
shape meter, to avoid short circuit caused by pen-shape meter.
S15 Maintenance Guide
1
S15 Maintenance Guide