Sony TV 4 Blinking Red Lights – Meaning, Causes & Fix
When a Sony Bravia TV blinks its red standby light four times in a repeating pattern and refuses to turn on, it is communicating a specific internal fault code. Sony TVs use a blink code system: the number of blinks before a pause identifies the type of hardware fault detected during the self-diagnostic cycle. Four blinks on a Sony TV points to a problem with the TV's power supply or backlight circuit. This guide explains precisely what 4 blinking red lights mean, what causes the fault, and what you can do — from simple resets to knowing when a repair technician is needed.
What it means
Sony TV self-diagnostic fault code indicating a power supply or backlight inverter failure. The TV has detected an internal hardware fault and will not start.
Severity
HighCan you fix it yourself?
Partial — a reset may clear a temporary fault, but a confirmed backlight or PSU fault requires a technician.
Call a technician when
If the 4-blink code returns after a full reset, professional repair is recommended.
What Does 4 Blinking Red Lights Mean?
Sony Bravia TVs use a standardized LED blink code system to communicate fault codes without needing an on-screen display. When the TV detects a critical fault during its startup self-test, it shuts down to protect the components and then blinks the standby LED a specific number of times in a repeating loop. The number of blinks before the pause is the fault code.
Blink code reference for Sony Bravia TVs:
| Blinks | Meaning |
|---|---|
| 2 blinks | Power supply or general power fault |
| 3 blinks | Backlight (inverter) issue or panel power fault |
| 4 blinks | Power supply voltage fault or backlight failure |
| 5 blinks | Main board or system fault |
| 6 blinks | Backlight inverter / LED driver fault |
| 7 blinks | Overheating or temperature sensor fault |
| 8 blinks | Panel or T-Con board fault |
4 blinks specifically indicates a fault in the power delivery chain — either the power supply board is not delivering the correct voltages, or the backlight LED driver is detecting a failure in the LED strips. On Sony's LED Bravia models, the backlight system and power supply are closely linked: if any LED strip has a failed LED, the driver detects the circuit break and shuts the system down, triggering the 4-blink code.
The TV is not broken beyond repair in all 4-blink cases. A temporary power glitch, a capacitor charging issue, or a minor firmware fault can also produce 4 blinks without permanent hardware damage.
What Causes This Error?
- Failed LED backlight strip(s) — one or more LEDs have burned out, breaking the circuit
- Power supply board fault — capacitors degraded or voltage rail failure
- Backlight LED driver circuit fault
- Power surge or voltage spike damaging the power supply board
- Temporary power glitch causing incorrect voltage reading on startup
- Overheating triggering the protection circuit — dust buildup in vents causes thermal shutdown
- Damaged or loose internal cable connecting the power board to the main board or panel
- Firmware-related startup fault in some Bravia Android TV models
How to Fix 4 Blinking Red Lights
- 1
Perform a full cold power cycle. Turn the TV off using the power button on the TV itself (not just the remote). Unplug the power cable from the wall. Wait 3 full minutes — this allows all capacitors on the power board to fully discharge, which can clear a temporary voltage fault that triggered the 4-blink protection. Plug back in and try powering on. If it starts normally, monitor for recurrence.
- 2
Count the blinks precisely. Watch the standby LED carefully and count the number of blinks before the pause. If you count 4 blinks, this guide applies. If you count a different number, the fault category is different — refer to the blink count chart above. Some users miscount due to the speed of the blink pattern; use a phone camera to record the blink sequence and count from the playback.
- 3
Check for overheating. Feel the back of the TV for excessive heat. Check that all ventilation slots on the back and sides of the TV are unobstructed — do not mount the TV flush against a wall with no gap, and do not store items on top of the TV. Use a vacuum with a brush attachment to clear dust from the ventilation slots. If the TV was running for many hours before showing 4 blinks, allow it to cool for 30 minutes before attempting a restart.
- 4
Perform a Sony TV reset using the remote while the TV is in the 4-blink state. With the TV plugged in and showing the blink code, press and hold the Power button on the TV itself for 10–15 seconds. On some Bravia models this triggers a full hardware reset that clears stored fault flags. Alternatively, on older Bravia models: unplug the TV, hold the Power button on the TV body for 30 seconds while unplugged, then release and plug back in.
- 5
Update or reinstall the firmware via USB if the TV briefly turns on before blinking. If the TV shows a picture for a few seconds before shutting down with 4 blinks, the fault may be firmware-related. Download the latest Bravia firmware for your exact model number from sony.com/en/articles/updating-your-tv-firmware. Copy it to a FAT32 USB drive, plug it in, and follow the on-screen update procedure.
- 6
If none of the above steps resolve the 4-blink code, the fault is most likely a failed LED backlight strip or a failing power supply board. These are repairable by a qualified technician. Before calling a service center, check whether your TV is still under Sony's warranty (typically 1–2 years) by registering at sony.com/mysony or contacting Sony Support. Out-of-warranty LED backlight replacement is a common repair with parts available for most popular Bravia models.
When to Call a Professional
A persistent 4-blink code after a full reset and cooling check points to a hardware fault — most commonly failed LED backlight strips or a degraded power supply board. Contact Sony Support at sony.com/support or an authorized Sony service center. Provide the full model number (found on the back label or Settings → Device Preferences → About). Backlight repairs are cost-effective on mid-range and premium Bravia models. For budget models over 5 years old, repair cost may approach replacement cost.
Can You Still Use the Device?
A Sony TV showing 4 blinking red lights will not power on in its normal state. The TV is in a protective shutdown mode and no features are accessible. Do not leave the TV plugged in and continuously attempting to restart while the fault is unresolved, as this can stress the power supply further.
See Also
Official Resources
Related Error Codes
Disclaimer: This article is for informational purposes only and does not constitute professional repair advice. CodeExplain is not affiliated with Sony or any other brand mentioned. Always consult a qualified technician for complex repairs.