中文
含义
创维电视检测到液晶面板供电异常，E2 代码表示面板所需的 VGH（栅极开启电压，通常约 25-32V）或 VGL（栅极关闭电压，通常约 -5V 至 -8V）超出正常范围。面板驱动 IC 因供电异常无法正常工作，导致屏幕显示异常——可能出现花屏、横纹、灰屏或完全不显示。
常见原因
- 逻辑板（T-Con）上的 DC-DC 转换器故障，无法生成 VGH 或 VGL 电压。
- 主板到逻辑板的供电线路或连接排线接触不良，导致供电电压跌落。
- 面板内部的栅极驱动 IC（GOA 电路）短路，拉低 VGH 或 VGL 电压。
- 逻辑板上的 VGH/VGL 升压电容老化漏液或容量下降，无法稳压。
- 电源板向逻辑板提供的 VCC（3.3V/12V）供电异常，导致 DC-DC 转换器无法正常工作。
自助排查
- 断开电源等待 5 分钟后重新开机，观察故障是否自行恢复。
- 检查屏幕显示的具体异常表现——全屏灰白且无图像可能是 VGH 缺失，出现横线或部分区域花屏可能与 VGL 有关。
- 轻轻按压逻辑板与面板连接的排线（COF 排线），观察屏幕是否有短暂变化——有时排线松动可以暂时改善接触判断故障位置。
- 使用万用表检测逻辑板上的 VGH 和 VGL 测试点电压（需有电路基础），对比标称值判断是否异常。
- VGH/VGL 故障通常涉及逻辑板或液晶面板本身，建议联系创维售后进行专业检测。
English
Meaning
The Skyworth TV has detected an abnormal LCD panel power supply. Code E2 indicates that VGH (gate turn-on voltage, typically 25-32V) or VGL (gate turn-off voltage, typically -5V to -8V) is outside the normal range. The panel driver IC cannot operate correctly due to abnormal power supply, resulting in display issues — distorted picture, horizontal lines, gray screen, or no display at all.
Common Causes
- The DC-DC converter on the T-Con board has failed and cannot generate the required VGH or VGL voltage.
- Poor contact in the wiring or ribbon cable between the main board and the T-Con board causes voltage drop.
- The gate driver IC or GOA (Gate on Array) circuit inside the panel is shorted, pulling VGH or VGL out of spec.
- The boost capacitors for VGH/VGL on the T-Con board have aged, leaked electrolyte, or lost capacitance.
- The VCC supply (3.3V/12V) from the power board to the T-Con board is abnormal, preventing the DC-DC converter from functioning.
Self-Check Steps
- Disconnect power for 5 minutes, then restart to see if the fault clears spontaneously.
- Observe the screen symptoms — a completely gray/white screen with no image often indicates missing VGH, while horizontal lines or partial distortion may relate to VGL.
- Gently press on the COF (Chip on Film) ribbon cables connecting the T-Con to the panel and watch for any change on screen — a loose connection may temporarily improve contact.
- If you have basic circuit knowledge, use a multimeter to measure VGH and VGL at the test points on the T-Con board and compare with the rated values.
- VGH/VGL faults typically involve the T-Con board or the LCD panel itself. Contact Skyworth after-sales service for professional diagnosis.