SGI Fuel Capacitor Replacement Guide
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The capacitors most likely to need replacing in a Silicon Graphics Fuel are in its power supply. SGI's Hardware User's Guide does not list the supply among the parts an owner may service, and SGI published no component values for it or for the system board.[1] The one published capacitor list for a Fuel supply is megaimg's order for his recap of a Sparkle FSP460-60PFN in 2021, given below. It is one owner's list for one of the four supply models, not an SGI parts list.[2]
Warning: the supply rectifies the mains and its primary filter capacitors hold a dangerous charge after the plug is pulled. Discharge them and check with a meter before touching the primary side. See also Capacitor Failure Symptoms.
Signs of failure
[edit | edit source]- The L1 reports the 12 V rail below its limit and shuts the system down. megaimg saw the rail fall to 10.2 V, mostly after the system had been off for a long time, and it would run after a few attempts.[2]
- Bulging capacitors: about half of those in megaimg's Sparkle unit, which used TEPO capacitors, had bulged, and some measured low on a tester.[2]
- weblacky warns that capacitors in supplies of this age often fail without any visible sign.[2]
- Owners connect supplies drifting out of regulation with failures of the DS1780 environmental monitoring chips on the system board, processor module and graphics board, which are much harder to repair than the supply.[3]
Which supply is fitted
[edit | edit source]Four supplies are known in Fuels. The SGI part number is on the supply's label:[2]
| SGI part number | Model | Maker | Rating | Capacitor list |
|---|---|---|---|---|
| 060-0140-004 | GM430WTXW01SSV | NMB | 430 W | None published |
| 060-0140-005 | GM430WTXW01SSV | NMB | 430 W | None published |
| 060-0140-007 | HP-W460GC33 | Hipro | 460 W | None published |
| 060-0202-001 | FSP460-60PFN | Sparkle | 460 W | megaimg's order, below |
jwhat opened an NMB unit (060-0140-004 rev B) and found its circuitry on two stacked boards, with a two-wire fan; he photographed both boards but listed no capacitor values.[2] The SGI version of the Sparkle supply differs from the retail one by a small extra board that produces the fan signal for the L1, and a three-wire Nidec fan.[2]
Sparkle FSP460-60PFN (SGI 060-0202-001)
[edit | edit source]megaimg replaced every capacitor in his supply. These are the parts he ordered, with the values decoded from the Nichicon and Kemet part numbers. Check each against the capacitor it replaces before ordering.[2]
| Order code as posted | Quantity | Value decoded from the part number |
|---|---|---|
| Mouser 647-UVY1C332MHD | 6 | 3300 µF 16 V, Nichicon VY |
| Mouser 647-UVY1A472MHD | 1 | 4700 µF 10 V, Nichicon VY |
| Mouser 647-UVY1A102MPD | 1 | 1000 µF 10 V, Nichicon VY |
| Mouser 647-UBT1C222MHD1TN | 2 | 2200 µF 16 V, Nichicon BT |
| Mouser 647-UPW1A681MPD6TD | 1 | 680 µF 10 V, Nichicon PW |
| Mouser 647-UVZ1V331MPD1TD | 1 | 330 µF 35 V, Nichicon VZ |
| Mouser 647-UVZ1C101MDD1TA | 2 | 100 µF 16 V, Nichicon VZ |
| Mouser 647-URZ1H470MDD1TA | 3 | 47 µF 50 V, Nichicon RZ |
| Mouser 80-ESS476M016AC2AA | 1 | 47 µF 16 V, Kemet ESS |
| Mouser 647-UKA1V330MDD1TD | 2 | 33 µF 35 V, Nichicon KA |
| Mouser 647-ULD1H220MDD1TD | 1 | 22 µF 50 V, Nichicon LD |
| Mouser 647-UMA1C220MDD1TP | 5 | 22 µF 16 V, Nichicon MA |
| Mouser 647-UPM1H100MDD1TA | 3 | 10 µF 50 V, Nichicon PM |
| Mouser 647-UMV1E4R7MFD1TP | 1 | 4.7 µF 25 V, Nichicon MV |
| Mouser 647-ULD1H2R2MDD1TD | 1 | 2.2 µF 50 V, Nichicon LD |
| Mouser 710-860020672001 | 2 | Würth Elektronik part; value not decoded |
| DigiKey 565-2789-ND | 2 | Value not decoded |
The list has 35 parts, with positions not given. After the recap megaimg reported all rails correct and the system back in service.[2]
Other supplies
[edit | edit source]No capacitor values have been published for the NMB or Hipro supplies. Before removing anything from one of these, record each capacitor's capacitance, voltage, temperature rating, diameter, height and lead pitch, and photograph both sides of the boards so that polarity can be checked on reassembly. weblacky's advice for the large snap-in filter capacitors is to measure them with calipers and match the size, and to take photographs before starting.[2]
System board and other boards
[edit | edit source]SGI published no capacitor values for the IP34 system board, the PIMM or the VPro graphics board.[1] Rules666's photograph shows radial electrolytic capacitors along the top edge of the system board and beside the DIMM sockets.[4] No owner's report on the IRIXNet threads used for these pages describes a failed capacitor on these boards.
Replacement procedure
[edit | edit source]SGI provides no procedure for opening the supply.[1]
- Remove the supply from the Fuel and unplug it. Let the primary capacitors discharge, then confirm with a meter.
- Photograph both sides of each board and record every capacitor's value, voltage, size and polarity.
- Desolder the capacitors. weblacky warns that large snap-in filter capacitors need a powerful iron or soldering gun and should be rocked out slowly so the through-hole plating is not pulled from the board.[2]
- Fit 105 °C low-ESR capacitors of the same capacitance and at least the same voltage, observing polarity.
- Reassemble, then check the outputs with the L1
envcommand before relying on the system. If the supply has been replaced by an ATX adapter arrangement instead, the adapter's instructions as weblacky relays them are to connect the 3.3 V and 5 V leads first and check them with the L1 before connecting the 12 V processor lead.[5]
Owners who would rather not rebuild the original fit a standard ATX supply through an adapter board; see SGI Fuel General Maintenance#Power supply.[2]
Related pages
[edit | edit source]- SGI Fuel
- SGI Fuel General Maintenance
- SGI Fuel Troubleshooting Guide
- Capacitor Failure Symptoms
- Recommended Tools
References
[edit | edit source]- ↑ 1.0 1.1 1.2 Silicon Graphics, Silicon Graphics Fuel Visual Workstation Hardware User's Guide, 007-4480-001, February 2002, chapter 4, Table 4-1, and appendix A, Table A-2 (File:SGI Fuel Visual Workstation Hardware User's Guide (007-4480-001).pdf). Customer-replaceable parts (the supply is not among them) and supply output ratings; no component lists.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 megaimg, jwhat, weblacky and others, "SGI Fuel PSU Replacement Options or Service the Original", IRIXNet forums, November 2021 to August 2022, forums.irixnet.org/thread-3233.html. Supply part numbers (from the SGI Depot site), 12 V sag, bulged TEPO capacitors, megaimg's Mouser and DigiKey order, NMB and Sparkle internals, removing snap-in capacitors.
- ↑ Raion and weblacky, "Dead Fuel", IRIXNet forums, October 2021, forums.irixnet.org/thread-3175.html. Supplies out of regulation damaging the DS1780 monitoring chips.
- ↑ Rules666, "SGI Fuel open", Wikimedia Commons, 2017 (File:SGI Fuel with side panel removed (Rules666).jpg).
- ↑ weblacky, "The start of a LONG Fuel repair thread...", IRIXNet forums, October 2021, forums.irixnet.org/thread-3185.html. ATX adapter connection order.