卡塔尔采购需求：触摸屏显示器，液晶触摸屏，液晶触摸显示面板，液晶屏模块，无线彩色温控器，智能房间温控器

I'm reaching out regarding a device we're currently using. We've encountered an issue where the numeric keys aren't appearing on the screen, making it impossible to enter values. Although we hear a beep sound when we press the keys, nothing is displayed, which is causing disruption in our operations. I'd appreciate your assistance in diagnosing the problem. Please let me know if there are any troubleshooting steps we should follow or if a repair is necessary. Additionally, it would be helpful to understand the lead time for any parts or replacements needed to resolve this. We're keen to get this sorted out as soon as possible to minimize downtime. Thank you!