中文
含义
背光系统故障。电视开机后屏幕无显示或背光闪烁，但指示灯和声音正常，表明背光驱动电路或LED灯条异常。
常见原因
- LED背光灯条老化或单颗LED开路损坏
- 背光驱动板（Boost板）输出电压异常或MOS管击穿
- 背光恒流控制IC损坏或虚焊
- 主板上背光使能信号丢失或PWM调光信号异常
- 灯条连接排线接触不良或插座氧化
自助排查
- 在暗光环境中开机观察屏幕是否有极微弱图像，若有则背光故障确认
- 检查电视电源指示灯是否正常亮起，排除整机供电问题
- 轻拍或按压屏幕边框中部，若背光短暂恢复考虑灯条排线接触问题
- 联系售后专业人员更换背光灯条或驱动板，不建议自行拆解
English
Meaning
Backlight system failure. The TV powers on with sound and indicator lights normal, but the screen remains dark or flickers, indicating LED backlight driver or LED strip issues.
Common Causes
- Aged LED backlight strips with one or more open-circuit LEDs
- Failed boost converter (backlight driver board) with abnormal output voltage
- Damaged or dry-soldered backlight constant-current controller IC
- Missing backlight enable signal or abnormal PWM dimming from main board
- Loose or oxidized wiring harness between driver board and LED strips
Self-Check Steps
- In a dark room, look closely for a very faint image on screen — if present, backlight failure is confirmed
- Verify the power LED lights normally to rule out main power supply issues
- Gently tap the middle of the bezel — if backlight briefly recovers, suspect loose LED strip connectors
- Contact authorized service for backlight strip or driver board replacement; DIY disassembly not recommended