中文
含义
创维电视检测到电源供电系统严重故障，E8 代码表示电源板（PSU）主要输出电压异常或电源保护电路已触发。电源板负责将交流市电转换为电视各部所需的直流电压（12V、24V、5VSB、3.3V 等）。此故障通常导致电视完全无法开机——指示灯不亮、无任何响应，或开机后立即自动关机。
常见原因
- 电源板主电解电容老化鼓包、容量下降或漏液，导致输出电压纹波过大或电压偏低。
- 开关管（MOSFET）或整流桥堆击穿短路，烧毁保险管导致整机不通电。
- 待机辅助电源（5VSB）故障，主板无法获得待机供电导致无法唤醒开机。
- PFC（功率因数校正）电路失效，导致主电容电压不足（正常约380V），开关电源无法正常工作。
- 光耦反馈或 TL431 电压基准损坏，导致输出电压失控升高触发了过压保护（OVP）。
- 电源板输出端存在短路负载（主板或背光驱动短路），电源进入打嗝保护模式。
自助排查
- 检查电源线是否完好插入，尝试其他已知正常的电源线，排除线材故障。
- 观察电源指示灯——完全不亮通常为电源板问题，亮红灯但不开机可能为待机电压正常但主电压异常。
- 断电后打开后盖（需有经验），目测电源板上是否有电容鼓包、顶部爆裂、保险管烧黑发黄、PCB 烧焦痕迹。
- 使用万用表检测电源板输出端各电压是否正常（特别是 5VSB、12V、24V），注意务必在安全断电放电后操作。
- 电源板内部有高压大电容（380V 直流），断电后仍可能存有危险电压——无专业经验不建议自行拆机维修，请联系创维售后。
English
Meaning
The Skyworth TV has detected a serious power supply system fault. Code E8 indicates that the power supply board (PSU) main output voltage is abnormal or the power protection circuit has been triggered. The PSU converts mains AC power to the various DC voltages required by the TV subsystems (12V, 24V, 5VSB, 3.3V, etc.). This fault typically results in the TV being completely dead — no power indicator, no response at all, or powering on briefly before immediately shutting down.
Common Causes
- Main electrolytic capacitors on the PSU have aged, bulged, lost capacitance, or leaked, causing excessive ripple or low output voltage.
- The switching MOSFET or bridge rectifier has shorted, blowing the fuse and leaving the TV completely unpowered.
- The standby auxiliary power supply (5VSB) has failed, preventing the main board from receiving standby power to wake up.
- The PFC (Power Factor Correction) circuit has failed, leaving the main capacitor voltage too low (normal ~380V DC) and preventing the switching supply from operating.
- The optocoupler feedback or TL431 voltage reference is damaged, causing the output voltage to rise out of control and trigger over-voltage protection (OVP).
- A short circuit on the PSU output (main board or backlight driver short) causes the PSU to enter hiccup protection mode.
Self-Check Steps
- Check that the power cord is fully inserted and try a different known-good power cord to rule out cable failure.
- Observe the power indicator — if it does not light at all, this typically points to a PSU issue; if the red light is on but the TV will not boot, standby voltage may be present but main voltages may be abnormal.
- After disconnecting power, open the back cover (experience required) and visually inspect the PSU for bulging capacitors, burst tops, blackened or yellowed fuses, or burn marks on the PCB.
- Using a multimeter, check the PSU output voltages (especially 5VSB, 12V, 24V). Always ensure the PSU is fully discharged before handling.
- The PSU contains high-voltage capacitors (380V DC) that retain dangerous voltage even after power is disconnected. Do not attempt DIY repair without professional experience — contact Skyworth after-sales service.