Core Viewpoint - The article discusses the consumer rights issues arising from the "green line" problem in smartphone screens, affecting major brands like OPPO, Vivo, Samsung, Xiaomi, and Huawei, highlighting the inconsistent after-sales service and warranty policies among these manufacturers [1][9]. Group 1: After-Sales Service Policies - OPPO and Vivo offer a warranty period of around four years, while Xiaomi, Huawei, and Honor typically provide one year of warranty service [3]. - OPPO announced free screen replacement for devices with green line issues within four years of purchase, while users with devices older than four years can receive discounted repair services [3]. - There are significant discrepancies in after-sales service experiences among OPPO users, with some receiving free replacements while others are denied service due to lack of purchase receipts [4][5]. Group 2: Consumer Complaints and Experiences - Many consumers report unreasonable demands for proof of purchase, such as requiring original receipts and packaging, which complicates the warranty claim process [4][8]. - Some users have successfully obtained free screen replacements after escalating complaints through various channels, despite being initially denied service [4][5]. - The article notes that even within the same brand, different service centers may apply different policies regarding the green line issue, leading to confusion and frustration among consumers [7][8]. Group 3: Technical Background of the Issue - The green line issue is a common fault in OLED displays, potentially caused by various factors such as chip failure or circuit issues [9][11]. - The problem has been linked to specific batches of screens supplied by Samsung, affecting multiple smartphone models [11]. - High temperatures and humidity are noted as conditions that can exacerbate the green line problem, with summer months being particularly problematic [12]. Group 4: Industry Response and Consumer Trust - There is a growing consumer expectation for a transparent and fair after-sales service system, especially in light of the marketing claims of high-quality products [13]. - The article emphasizes that the lack of a unified standard in after-sales service undermines consumer trust, as users feel that the service does not match the promised product quality [13].