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
-
Macro thermal image of over-temperature U8 (TNY278PN)
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 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
-
Top -
Bottom
WARNING Capacitor C22 is 400 V 470 µF (37.6 J), it does not have a bleed resistor.
| 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
| RefDes | Qty | Compatible Part Number | Order Links |
|---|---|---|---|
| U8 | 1 | TNY278PN | DigiKey Mouser LCSC |
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