Frequently Asked Questions

Our products fall into four groups: ① Automotive testers (ECU EOL testers and inline program writers such as RG3, RG3PE, MQ4PE, DL3PE, SX2 LDM EOL, AU38XPA EOL, JG CDM, Adapter FCT); ② LED module testers (DIV testers, inline photometric testers, Ford room-lamp tester, illuminance and light-distribution testers, BLU high-temperature testers, and LED lighting vision/AC/photometric testers); ③ Other measuring instruments (LDM-XX60 precision meter, BLDC PWM/CAN Controller); and ④ OEM/ODM development services.

We serve four main industries: (1) Automotive electronics — ECU EOL, CPU Writer, room-lamp and photometric testers; (2) LED lighting/BLU — Samsung BLU, lighting modules, DIV/photometric/AC/MURA inspection; (3) Display and precision metrology — TV/monitor BLU high-temp inline, OLED aging, MINI LED DIV; and (4) New mobility — EV charging connector (NACS/CCS1) TCO testing, 48V BLDC motor PWM/CAN testing.

We have direct and indirect supply records with global OEMs including Hyundai, KIA, Ford and Audi. Representative mass-production cases include the Genesis G80 3rd-generation EOL, MQ4-PE / DL3-PE / AU38XPA production testers, the FORD room-lamp tester, and automotive headlamp aging testers. Detailed delivery references can be provided separately upon a quotation request.

We have held two international certifications — ISO 9001 (Quality Management System) and ISO 14001 (Environmental Management System) — since 2010. Under both systems we manage the entire process of design, manufacturing, validation and delivery in-house. Copies of accredited test reports and certificates are provided together with a quotation.

We hold six patents registered since 2006, in the fields of LED module inspection, aging inverters and precision measurement. Key registered patents include the Integrated LED Module Inspection Apparatus (2022, reg. 10-2350618), the LED Module Inspection Method and Apparatus (2018, reg. 10-1865363), the Beam-Angle Adjustable LED Streetlight (2011, reg. 10-1050242), and the Aging Inverter for CCFL/EEFL Fluorescent Lamps (2006, reg. 10-0660169). The full patent list is available on the Certifications & Patents page.

Yes. We carry out OEM / ODM development in automotive electronics, LED inspection and precision measurement. We handle the four stages — requirement definition → in-house design → prototype/production → line stabilization — consistently with our own staff. The dedicated information page is currently being updated; specific specifications can be discussed via a quotation request or by phone.

We accept inquiries through three channels: (1) the online quote request form — /en/p/quote; (2) email — info@yoowonlds.com; and (3) phone — +82-32-229-4990. A responsible engineer provides a first reply within one business day. Email and KakaoTalk are received 24 hours a day, with replies on the next business day.

We operate weekdays 09:00–18:00 (Korea Standard Time, KST, UTC+9). Lunch is 12:00–13:00. We are closed on Saturdays, Sundays and public holidays; inquiries received on holidays are answered on the next business day.

Our engineering team responds directly. General A/S inquiries receive a first reply within one business day, and for urgent cases involving a production-line stoppage we dispatch to the site the next day as a rule. The scope and detailed conditions of on-site support follow the maintenance agreement signed at the time of delivery.

You can download product catalogs, datasheets and certificate copies from the PDF catalog page (/en/board/download). If you need confidential specifications or test reports, please request them separately with your quotation and we will reply after review.

We are located at #306, Bldg. 302, Ssangyong 3rd Tech Park, 397 Seokcheon-ro, Ojeong-gu, Bucheon-si, Gyeonggi-do (ZIP 14441). By car it is about 10 minutes from Ojeong IC or Bucheon IC; by public transport it is accessible from Bucheon Stadium Station on Seoul Subway Line 7 / Bucheon Line 1. Visits are by prior appointment — please arrange a schedule by phone (+82-32-229-4990) or email before visiting.

The website is provided in four languages — Korean, English, Japanese and Chinese (Simplified). Email and quotation inquiries can also be handled in the same four languages. For overseas sales or technical inquiries, please contact info@yoowonlds.com or +82-32-229-4990.

2006 Yoowon LDS founded (CCFL aging inverter development) → 2010 ISO 9001 / 14001 certified → 2014 incorporation and mass production of LED PKG vision inspection → 2017 mass production of the FORD room-lamp tester and automotive headlamp aging → 2022 mass production of Genesis G80 3rd-gen, MQ4-PE / DL3-PE / AU38XPA → currently developing JG CDM, Adapter FCT and LED lighting photometric (C-7000). As of 2026 we mark our 20th anniversary.