Sony TV Error 4012 is officially described as a “device failure” message, which means the TV has detected a problem with its internal hardware or critical system state and may need repair. Nonetheless, a structured sequence of resets and diagnostics can sometimes clear the error, especially if it stems from firmware glitches or temporary hardware confusion. If the error persists after these steps, the issue is likely deeper hardware‑related and best handled by a Sony‑authorized service center.
Step 1: Confirm the error and perform a basic power‑off
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Write down the exact error screen (e.g., “Error 4012: Device failure may require repair”).
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Switch the TV off at the wall outlet, unplug the power cord, and leave it unplugged for 2–5 minutes to let internal capacitors discharge.
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Plug the TV back in and power it on normally with the remote or front‑panel button.
If the error disappears and the TV behaves normally, the fault was likely temporary; if it reappears immediately, move to the next step.
Step 2: Soft reset using the remote
Sony’s general troubleshooting guide recommends a soft reset as the first software‑level step.
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Ensure the TV is on.
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Press and hold the power button on the supplied remote for about 5–7 seconds; the TV should restart automatically.
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Wait approximately 1 minute for the TV to reboot and check whether Error 4012 reappears.
If the soft reset doesn’t clear the code, try a full‑system reset after the next step.
Step 3: Power cycle the TV normally (no‑remote)
If the remote is not working or the TV is locked up, use a manual power cycle.
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Unplug the TV.
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If accessible, press and hold the physical power button on the TV for about 10–15 seconds to fully discharge it.
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Reconnect the power, switch on, and see if the TV boots past the error message.
If the error persists, the issue is likely beyond a simple transient hang.
Step 4: Factory reset (if the screen is accessible)
If the TV can reach the home screen or a menu even intermittently, a factory reset can clear firmware‑related corruption that may be triggering the device‑failure code.
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Press the HOME button on the remote.
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Go to Settings → Customer Support (or System/General) → Factory Settings / Factory reset and confirm.
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Wait for the reset to complete; the TV will reboot and prompt you to set it up again.
If the TV immediately returns Error 4012 after a factory reset, this strongly suggests an internal hardware fault rather than a user‑settings or app‑level problem.
Step 5: Check for software updates (if the TV is usable)
If the TV is operational between error occurrences, ensure the system‑software is up‑to‑date.
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Press HOME → Settings → Customer Support → Software Update.
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Choose Network or USB, then follow the on‑screen guide to install the latest firmware (if available).
A failed or incomplete update can contribute to device‑failure‑type errors, so finishing or re‑running an update can sometimes clear 4012.
Step 6: When to seek professional repair
Sony explicitly states that Error 4012 can occur when an internal part of the TV fails and recommends contacting Product Repair or customer support. At this point, one of the following is usually true:
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The TV repeatedly shows Error 4012 after a factory reset and fresh power‑cycle.
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The TV hangs, freezes, or restarts unpredictably, indicating a hardware problem (mainboard, memory, storage, or power‑related).
In such cases, the safest step is to:
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Book a technician visit or drop off the TV at a Sony‑authorized service center.
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Provide the exact model and a description of the sequence leading up to the error (crashes, restarts, failed updates, etc.) so the technician can focus on the likely internal subsystem.
Overall, Error 4012 cannot always be fixed by the user: basic power‑cycle, soft reset, factory reset, and software‑update steps can resolve some cases, but if the code returns immediately or the TV is unstable even after those actions, the correct move is professional repair.