中文
含义
LED指示灯闪烁3次，表示背光驱动电路故障。与1次闪烁不同，3次闪烁通常指向背光LED驱动板（LED Driver Board）本身而非LED灯条，说明驱动板的升压转换器或恒流控制电路异常。
常见原因
- 背光驱动板上的升压转换器（Boost Converter）芯片损坏
- 驱动板输出电流检测电阻开路或阻值漂移，导致恒流控制失效
- 背光使能信号（BL_EN）或PWM调光信号未从主板正常送达
- 驱动板电解电容老化导致输出纹波过大
- 驱动板与LED灯条之间的连接器接触不良
自助排查
- 检查主板到背光驱动板的排线是否插紧，针脚有无氧化
- 测量背光驱动板输入电压（通常12V或24V）是否正常
- 使用示波器检查升压转换器输出波形是否规整
- 如驱动板明显损坏，需更换同型号背光驱动板
English
Meaning
The LED indicator blinks three times, indicating a backlight driver circuit failure. Unlike the 1-blink code which points to the LED strips or panel, 3 blinks specifically indicate an issue with the backlight LED driver board itself — the boost converter or constant-current control circuit is abnormal.
Common Causes
- Boost converter IC on the driver board damaged
- Output current sensing resistor open or drifted, causing constant-current control failure
- Backlight enable signal (BL_EN) or PWM dimming signal not reaching the driver board from the main board
- Electrolytic capacitors on the driver board aged, causing excessive output ripple
- Poor contact at the connector between driver board and LED strips
Self-Check Steps
- Verify the ribbon cable between main board and backlight driver board is fully seated and pins are clean
- Measure the driver board input voltage (typically 12V or 24V) for correctness
- Use an oscilloscope to check the boost converter output waveform for regularity
- If the driver board is clearly damaged, replace it with an equivalent model