中文
含义
电源板故障。电视机完全不通电、开机后自动关机、或使用中频繁重启。
常见原因
- 电源板主保险丝熔断——多为后级短路导致
- 初级侧大电解电容鼓包或漏液失去滤波能力
- PWM电源管理IC损坏导致待机电压异常
- 开关管或整流二极管击穿短路
- 次级侧输出电容老化导致电压纹波过大触发保护
自助排查
- 确认电源线两端插紧,测试墙插是否有电
- 检查电源板上保险丝是否熔断(目视熔丝断开或发黑)
- 观察电源板电容顶部是否鼓包或漏液
- 测量待机电压(通常为3.3VSB或5VSB)是否正常
- 若保险丝熔断或电容鼓包,更换同规格配件并检查后级短路
English
Meaning
Power supply failure. The TV has no power at all, shuts down shortly after turning on, or reboots repeatedly during use.
Common Causes
- Blown main fuse on the PSU board — usually caused by a short circuit downstream
- Bulging or leaking primary-side electrolytic capacitors losing filtering capacity
- Failed PWM power management IC causing abnormal standby voltage
- Short-circuited switching MOSFET or rectifier diode
- Aging secondary-side output capacitors producing excessive ripple that triggers protection
Self-Check Steps
- Ensure the power cord is fully inserted at both ends and test the wall outlet with another device
- Visually inspect the PSU fuse — a blown fuse appears broken or blackened
- Check the tops of electrolytic capacitors for bulging or leakage
- Measure the standby voltage (typically 3.3VSB or 5VSB) with a multimeter
- If the fuse is blown or capacitors are bulging, replace with matching specs and check for downstream shorts