中文
含义
创维电视检测到音频功放电路故障，E9 代码表示音频放大器（Audio Amplifier，通常为 Class-D 功放 IC）工作异常。功放 IC 负责将音频信号放大后驱动扬声器发声。此故障出现时电视画面正常，但完全没有声音，或声音失真、有杂音或音量异常。功放 IC 检测到输出过流、过热或直流偏移时会触发保护并报告此错误。
常见原因
- 功放 IC 芯片（如 TAS5707、TPA3110 等）损坏——内部功率管击穿或驱动电路失效。
- 扬声器阻抗异常——喇叭音圈短路（阻抗过低）或开路（阻抗无穷大），导致功放输出异常。
- 功放供电电压异常——功放通常需要 12V-24V 供电，供电缺失或纹波过大会导致失真或无声。
- 功放 IC 散热不良，芯片过热触发热保护（OTP）关闭输出。
- 主板上音频处理芯片或 DAC 输出异常，无有效音频信号送到功放输入端。
- 音频输出端耦合电容或电感虚焊，隔断了音频信号通路。
自助排查
- 检查电视是否被设为静音状态，按遥控器上的静音键取消静音，调高音量确认。
- 检查设置菜单中的音频输出模式——确认扬声器输出未设为”外部音响”或”SPDIF 独占”模式。
- 通过耳机接口或蓝牙音箱测试音频输出——如果耳机有声音而扬声器无声，问题聚焦在功放电路。
- 在电视菜单中将音频设置恢复为默认值，并重新启动电视。
- 用手背触摸功放 IC 散热面检查温度——过烫（手无法保持 5 秒）可能为功放损坏短路，完全不发热可能为供电或芯片本身故障。
English
Meaning
The Skyworth TV has detected an audio amplifier circuit fault. Code E9 indicates that the audio amplifier (typically a Class-D amplifier IC) is operating abnormally. The amplifier IC is responsible for amplifying the audio signal to drive the speakers. When this fault occurs, the TV picture is normal but there is no sound at all, or the sound is distorted, contains noise, or the volume is abnormal. The amplifier IC triggers this error when it detects output over-current, over-temperature, or DC offset.
Common Causes
- The amplifier IC (e.g., TAS5707, TPA3110, etc.) is damaged — the internal power transistors have shorted or the driver circuit has failed.
- Abnormal speaker impedance — the voice coil is shorted (impedance too low) or open (infinite impedance), causing abnormal amplifier output.
- The amplifier supply voltage is abnormal — the amplifier typically requires 12V-24V; missing supply or excessive ripple causes distortion or no sound.
- The amplifier IC has poor heat dissipation, causing it to overheat and trigger thermal protection (OTP), shutting down output.
- The audio processing chip or DAC output on the main board is abnormal, with no valid audio signal reaching the amplifier input.
- The coupling capacitor or inductor at the audio output has a cold solder joint, blocking the audio signal path.
Self-Check Steps
- Check whether the TV is muted — press the mute button on the remote to unmute, and increase the volume to confirm.
- Check the audio output mode in the settings menu — ensure the speaker output is not set to “external audio” or “SPDIF exclusive” mode.
- Test audio output through the headphone jack or Bluetooth speaker — if headphones produce sound but speakers do not, the issue is localized to the amplifier circuit.
- Reset audio settings to defaults in the TV menu and restart the TV.
- Touch the amplifier IC heatsink with the back of your hand to check temperature — if it is too hot to hold for 5 seconds, the amplifier may be shorted; if it is cold, power or the chip itself may be faulty.