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• DA92-00089A is the original Samsung/Daewoo BLDC-compressor inverter board used in refrigerators such as Daewoo FRN-X22F3CSI and several Samsung side-by-side models.
• The part is end-of-life at Samsung, so genuine stock is scarce; look first at authorised appliance-parts distributors, then global marketplaces (eBay, Amazon, AliExpress) under all equivalent numbers:
– DA92-00089A (marketing number)
– DA41-00523B / DA41-00523C (PCB silkscreen)
– Service replacements occasionally shipped as DA92-00459A, ‑00889A or complete “module-assy-inverter”.
• If no new board is available, board-level repair (LNK304GN power-supply section) or a salvaged/refurbished unit is the most practical alternative.
Functional role
• Converts 200–325 V DC (rectified mains) to a three-phase, variable-frequency output (20–120 Hz typ.) for the refrigerator’s hermetic BLDC compressor.
• Integrates a non-isolated fly-back SMPS (U201 = LNK304GN) that generates 12 V/5 V for the MCU and gate-drive circuitry, Hall feedback conditioning, and serial communication to the main control board.
Typical failure modes
• Primary SMPS: shorted LNK304GN → open fusible resistor (4R7–33 Ω) + burnt metal-film resistor network, sometimes cracked safety Y-capacitor.
• Aged bulk electrolytic capacitors (400 V, 150–220 µF) elevating ripple and over-stress on IGBTs.
• Gate-driver IC insulation breakdown after surge or lightning.
Confirming inverter failure before purchase
• Mains present at board, but no 12 V on CN-PWR pin 1 → SMPS dead.
• Main board sends RUN line (5 V or open-collector) but compressor draws <100 mA → inverter not generating 3-phase.
• Compressor windings measure equal resistance (6–15 Ω) and no short to shell → motor healthy.
Cross-compatibility matrix (field experience / Samsung service bulletins)
```
┌───────────────┬────────────────────┬───────────────────────┐
│ Refrigerator │ Factory board │ Service substitute │
├───────────────┼────────────────────┼───────────────────────┤
│ FRN-X22F3CSI │ DA92-00089A │ DA92-00459A / ‑00889A │
│ RSG5 │ DA41-00523B │ DA92-00486A │
│ RS21 │ DA92-00089A │ DA92-00459A │
└───────────────┴────────────────────┴───────────────────────┘
Always verify connector count (8-pin PWR, 2-pin COMM, 3-pin Hall, 3-phase output lug spacing) before substitution.Repair feasibility
• Cost: LNK304GN (≈ 2 €), fusible resistor, 6 × low-ESR electrolytics → <10 €.
• Success rate: ~80 % if SMPS only, drops sharply if MCU or IGBTs have failed.
• Requires hot-air or rework station; board is coated with silicone varnish—pre-heat to 120 °C to avoid pad lift.
• Market availability (Q2 2024)
– New-old-stock listings on Desertcart, Amazon (ASIN B0F21RPQH7, B0FMQPSJNC) and eBay UK/DE (~90–130 €).
– Choukapieces and several EU spare-parts portals flag item “indisponibil” → officially discontinued.
• Rise of fully integrated compressor+drive assemblies (e.g., LG IMD, Samsung DIGM) means future boards will not be stocked separately; whole compressor module will be replaced instead.
• After-market clones from Chinese vendors show acceptable build quality but use lower-grade electrolytics—expect shorter MTBF.
Schematic fragment of SMPS (simplified):
\[
\text{HVDC} \; (\approx 325\text{ V}) \xrightarrow{R{fus},C{snub}} \text{LNK304GN} \rightarrow L\,{\sim}\,1\text{ mH} \rightarrow D_{fast} \rightarrow C_{low} (16 V) \rightarrow 7805
\]
If R_fus is open and C_low ESR > 2 Ω, the MCU loses 5 V and inverter is silent. Replacing only LNK304GN without renewing C_low often results in repeat failure within months.
Analogy: Think of the board as a three-phase variable-frequency drive (VFD) shrunk to postcard size and potted for moisture resistance.
• Mains-side work exposes >325 V DC; repairs must comply with IEC 60335-1 and local electrical safety regulations.
• Counterfeit ICs and electrolytics are common—sourcing through authorised distributors (Mouser, Farnell) mitigates risk.
• If selling the fridge after a third-party board repair, inform the buyer to avoid liability.
• Using a universal HVAC inverter is theoretically possible but rarely cost-effective and may void compressor warranty.
• Firmware differences between revisions can alter defrost algorithm; mixing boards may slightly shift temperature calibration.
• Download Samsung service manuals for models RS21/RSH1 – their inverter diagnosis flowchart applies 1:1.
• Read Power Integrations application note AN-37 for deeper insight into LNK304-based auxiliary supplies.
• Investigate upgraded drop-in IC (LinkSwitch-TN2) with higher surge tolerance for long-term reliability.
DA92-00089A is the legacy Samsung/Daewoo inverter PCB that drives the refrigerator’s BLDC compressor. Genuine boards are out of production, so combine part-number cross-referencing (DA41-00523B/C, DA92-00459A/-00889A) with global marketplace searches, or consider board-level repair—typically replacing the failed LNK304GN power-supply section. Ensure electrical compatibility, observe high-voltage safety, and test compressor function after installation to confirm a successful fix.