デジタル液晶の欠け修理　大抵ここが原因です

If even one part of a digital LCD is chipped, you think, "It's broken!" Many people probably don't hesitate to buy a new timer from a 100-yen shop. However, if you understand the display principle, it's easy to repair, so if you don't mind putting in a little effort, you can avoid spending money. *Some content corrections (pointed out by viewers) 4:30 KURE5-56 and S.T. WD-40 contain solid matter, so it is better not to use them on electrical contacts. Also, some people don't use contact cleaners because they contain adhesive ingredients. There is a section on removing verdigris in the video, but if you're interested, you can watch it here. ⇒   • 緑青が吹いた どうやって除去する？