Simpson SWT954

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Simpson SWT954
Preliminary Information
Release Year 2010
Leak Risk Low
Batteries None
Mounting Technology Through Hole, SMD
Capacitor Types Aluminum Electrolytic, Ceramic, Film
Destructive Entry No

The Simpson SWT954 is a 9.5 kg top load washing machine (Electrolux design rebranded as Simpson with minor changes).

Known Issues

Unit turns off after being powered on for a couple minutes

Causes

  • Off-line SMPS IC has partially failed and is tripping it's internal over-temperature cut-off

Solutions

  • Replace SMPS U9 TNY278PN

Unit will shake excessively during cycle and stop with error code 'E17' and four beeps

Causes & solutions

  • Unit is overloaded: ensure weight of load is less than your model's limit
  • Load is imbalanced: redistribute load to be more balanced
  • Bowl springs have failed or become loose: replace or re-tighten
  • Out of balance detection switch is not aligned correctly: replace or re-align

Disassembly Notes

warning WARNING This device contains a non-isolated mains voltage buck switch mode power supply. Low voltage circuity still poses a shock hazard.
  • This device is designed well with service and repair in mind
  • The manufacturer has published exploded assembly diagrams showing all fasteners and components (See 'EX. VIEW DRAWING 7696' for SWT954)
  • The front control panel bezel is held on with two screws at the back of the unit
  • The power supply and motor drive PCB is removed with two screws and unclipped from the plastic holder

Original Parts

Power supply and motor drive PCB

HT-PCB-140-08058A-P-V06

warning WARNING Capacitor C22 is 400 V 470 µF (37.6 J), it does not have a bleed resistor.

ICs
RefDes Qty Part Number Brand Series Mount Footprint Failure Mode
U8 1 TNY278PN Power Integrations TinySwitch-III THT 8-PDIP-C Silicon damage causes IC to overheat and go into thermal shutdown

Replacement Parts

Power supply and motor drive PCB

ICs
RefDes Qty Compatible Part Number Order Links
U8 1 TNY278PN DigiKey Mouser

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search

Related Links

References