中文
含义
主板故障。电视开机后电源指示灯亮但无法正常启动系统，指示灯闪烁异常或屏幕完全无响应。
常见原因
- 主板DC-DC供电电路稳压器损坏导致核心电压缺失
- eMMC/NAND闪存芯片老化或坏块过多导致系统无法加载
- DDR内存颗粒虚焊或损坏
- 主芯片（SoC）过热或BGA焊点开裂
- 固件损坏或升级中断导致Bootloader丢失
自助排查
- 断电后按住电视机身物理电源键30秒释放残余电荷，重新上电
- 检查主板上的指示灯状态——常亮/闪烁频率是否符合正常模式
- 尝试通过USB端口强制刷写固件（工程模式）
- 测量主板各关键测试点电压（3.3V、1.8V、1.2V、Vcore）
- 主板损坏建议更换同型号主板总成
English
Meaning
Main board failure. The TV powers on (indicator lit) but fails to boot the operating system, with abnormal LED blinking or no on-screen response.
Common Causes
- Faulty DC-DC regulator on the main board causing missing core voltages
- Worn-out eMMC/NAND flash memory with excessive bad blocks preventing system load
- Loose solder joints or failed DDR RAM chips
- Overheated SoC (System on Chip) with cracked BGA balls
- Corrupted firmware caused by interrupted update or bootloader loss
Self-Check Steps
- Unplug the TV, press and hold the physical power button for 30 seconds to drain residual charge, then reconnect
- Observe the main board LED indicator — note the flash pattern to identify fault type
- Attempt a forced firmware update via USB port (engineering recovery mode)
- Measure key voltage test points on the main board (3.3V, 1.8V, 1.2V, Vcore)
- If the main board is confirmed faulty, replace with a compatible assembly