E2 - 创维 电视

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

1. 逻辑板（T-Con）上的 DC-DC 转换器故障，无法生成 VGH 或 VGL 电压。
2. 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。
3. 面板内部的栅极驱动 IC（GOA 电路）短路，拉低 VGH 或 VGL 电压。
4. 逻辑板上的 VGH/VGL 升压电容老化漏液或容量下降，无法稳压。
5. 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

1. 断开电源等待 5 分钟后重新开机，观察故障是否自行恢复。
2. 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。
3. 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。
4. 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。
5. 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

1. The DC-DC converter on the T-Con board has failed and cannot generate the required VGH or VGL voltage.
2. Poor contact in the wiring or ribbon cable between the main board and the T-Con board causes voltage drop.
3. The gate driver IC or GOA (Gate on Array) circuit inside the panel is shorted, pulling VGH or VGL out of spec.
4. The boost capacitors for VGH/VGL on the T-Con board have aged, leaked electrolyte, or lost capacitance.
5. 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

1. Disconnect power for 5 minutes, then restart to see if the fault clears spontaneously.
2. 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.
3. 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.
4. 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.
5. VGH/VGL faults typically involve the T-Con board or the LCD panel itself. Contact Skyworth after-sales service for professional diagnosis.