4-inch Round LED Brake/Tail Light (Universal for Vehicles)

Customer *** inspected the 8th batch of 5,000 sets of truck trailer LED tail lights and found through sampling that about 12% (600 sets) had severe lumen depreciation, LED chips not lighting, or short circuits causing complete light failure; poor film sealing and sealant on the same batch also caused water ingress in some lamps. The customer demands full replacement or compensation and has suspended production and shipment of the next batch.

1) Immediately initiate the after-sales process with customer *** and request the customer to provide the defective samples (100 sets) and photos, videos, production batch numbers and delivery notes of the problematic fixtures for traceability; 2) Our side will organize an engineering team to perform remote analysis within 48 hours and dispatch an inspector to the customer's warehouse to perform on-site sampling inspection to confirm the scope of the problem within 72 hours; 3) Based on the on-site inspection results (confirmed to be caused by batch soldering defects, potting process deviation, and abnormal parameters in some batches of LED chips), we propose three options for the customer to choose from: A. Return the entire batch for a full refund; B. We arrange rework/refurbishment of 600 defective sets at our factory and bear the rework transportation and labor costs, and after rework we will additionally provide replacement free of charge for a 5% spare/damage rate; C. Compensate in full at unit price for the confirmed damaged quantity and fully inspect the remaining inventory and rework or replace any defective items found free of charge; 4) We promise to complete and ship the first batch of 100 replacement samples to the customer for reinspection within 7 working days; if the reinspection passes, the full handling will be carried out according to the customer's selected option; 5) To prevent recurrence, we will provide focused inspection free of charge on the next three batches (total 15,000 sets) and provide inspection reports, optimize potting and soldering processes, replace the related defective LED chip supplier and provide process tracking reports; 6) Both parties will sign a written after-sales agreement that specifies the schedule for returns/exchanges, shipping responsibilities, quality acceptance standards and subsequent compensation terms, and the customer's information will be redacted as *** in the agreement to protect privacy.

The customer (***) reported that after receiving a shipment of 2,400 sets of truck trailer LED combination lights, products from multiple containers exhibited module flickering, instability, and some lamps not lighting during power-on tests. The issue is concentrated on LED strips and combination lights from the same batch. The customer stated this affects the upcoming vehicle assembly line delivery and requested localization and a remote solution within 48 hours to avoid production stoppage.

1) Remote information collection: Request the customer to upload via encrypted email/FTP the serial numbers of representative faulty products, production batch numbers, factory firmware versions, bulk shipment lists, and fault videos (including power-on waveforms, short videos showing flicker frequency and non-illuminated positions). 2) Remote diagnosis process: a. Guide the customer’s on-site engineer to obtain fault logs using the diagnostic firmware tool we provide (including power voltage curves, drive current, CAN/wiring harness communication logs), and share the screen in a remote meeting to view the data in real time; b. Require the customer to perform voltage-stability tests on the power supply (vehicle 12V/24V) and use an oscilloscope to capture power noise and transient drops; c. Guide the customer to replace suspected faulty wiring terminals and quick connectors (we suspect poor contact or plating issues) and observe changes; d. If firmware incompatibility is found, remotely push a patch firmware for that batch (via our secure remote upgrade package) and guide on-site personnel step-by-step to complete OTA or wired upgrades. 3) Risk control and return-to-factory process: If remote repair cannot cover the issue or hardware defects are confirmed, guide the customer to isolate the faulty batches by priority and arrange expedited return-to-factory or on-site replacement services, providing and coordinating emergency air shipment of replacement lamps (costs borne according to contract terms). 4) Subsequent preventive measures: Based on diagnostic results, we will simultaneously modify the factory test process (add power transient tests and connector durability tests), and provide the customer with batch tracking sheets and installation precaution documents.