Sony Sony KD-43X85K 43-Inch 4K LED Smart TV 4 BLINKS Error Fix: Standby LED Blinks 4 Times — Power Supply / Temperature Protection

Error code 4 BLINKS on the Sony Sony KD-43X85K 43-Inch 4K LED Smart TV means: Standby LED Blinks 4 Times — Power Supply / Temperature Protection. The standby LED blinks 4 times, pauses, then repeats. Four blinks commonly indicates a power supply (APS — Active Power Supply) board error or that the internal temperature protection circuit has activated. The power supply board may have detected an abnormal voltage condition on one of its output rails, or the temperature inside the TV has exceeded the safe operating threshold. Verified common causes include swollen or leaking electrolytic capacitors on the power supply board, blocked ventilation causing heat buildup, and failed voltage regulation circuits. The TV may power on briefly and display a picture before shutting down, or may not power on at all.

The most successful fix is "Replace Power Supply Board and Inspect Capacitors" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Yes — the top-ranked community fix ("Replace Power Supply Board and Inspect Capacitors") is rated hard difficulty and takes about 90 minutes. Tools needed: Phillips #2 screwdriver, Multimeter, Soldering iron (optional).

DIY cost: $10-$20. Professional repair typically costs $150-$300. Many homeowners save money by trying the top-ranked community fix first.

The Sony Sony KD-43X85K 43-Inch 4K LED Smart TV has 8 other known error codes, including: 2 BLINKS (Standby LED Blinks 2 Times — Main Board / System Error), 3 BLINKS (Standby LED Blinks 3 Times — Backlight / DC Voltage Error), 5 BLINKS (Standby LED Blinks 5 Times — T-Con / Panel Communication Error), 6 BLINKS (Standby LED Blinks 6 Times — Backlight / LED Strip Failure), 7 BLINKS (Standby LED Blinks 7 Times — Thermal Protection Shutdown), and 3 more.

Error code 4 BLINKS also appears on 3 other Sony models: Sony XBR-65X950H 65-Inch 4K Full Array LED Smart TV, Sony XR-55X90K 55-Inch 4K Full Array LED BRAVIA XR Smart TV, Sony XR-65A80K 65-Inch 4K OLED BRAVIA XR Smart TV. The fix may vary by model, so check each model's specific page for tailored repair steps.