HI Nicopachon, We are sorry to hear about your experience with the TU7000 TV having wi-fi connectivity issues and a green line on the screen. Please know we are here to help you. First, let's ensure your Firmware is up to date. Go to Settings> Support> Software Update. Next, to address the green line on your screen, please follow the below steps: 1. Check all input cable connections if any external devices are connected. 2. If the issue persists, define exactly what is wrong with the display. For example, mosaics and blocks, multiple lines or white dots, and fixed horizontal or vertical lines. 3. Try changing channels using the remote control. Is the issue the same on all media? 4. Press the Home button (which looks like a house), select Source, and choose another input source. Is the issue the same on all sources? 5. If the same problem persists, run a diagnostic test. (Home > Settings > Support > Device Care > Self Diagnosis > Picture Test). 6. If the problem disappears during the test, check your TV signal (Home > Settings > Support > Device Care > Self Diagnosis > Signal Information) to check the signal strength. For stable signal reception, the signal strength must be more than 20 dB (more than 4 bars on the icon). To address your wi-fi connectivity issue, please try the following: 1. Use 5Ghz wi-fi if possible 2. Try wired LAN if available 3. Try repositioning the router, so there are no obstacles between your TV and the router Should your issue persist, please get in touch with Samsung Customer Support. You can contact us at 1-800-SAMSUNG, 8 AM - 12 AM EST, seven days a week. LiveChat with an agent, as well as manuals, software, and warranty info, can be found at the ‘Support’ link on our Samsung website. ~ Samsung Advisor

MALAV MISTRY: If your TV is flickering or dimming sporadically, you may need to disable some of the energy efficiency features. Disable Ambient Light Detection, Power Saving Mode, Motion Lighting, or Contrast Enhancer. Settings > General> Eco Solution> Ambient Light Detection Settings > General> Eco Solution> Power Saving Mode Settings > General> Eco Solution> Motion Lighting Settings > Picture > Expert Settings > Contrast Enhancer Run Picture Test. When the tested image quality is normal, check the signal of the connected device. Settings > Support > Device Care > Self Diagnosis > Picture Test I hope this helps. If your issue persists, please contact Samsung TV Support at 1-800-SAMSUNG (available 8AM -12AM EST, 7 days a week) Or visit us on the Samsung website and click on the SUPPORT link in the upper right corner for: 1) Contact Us Options (LiveChat, Remote Support, Facebook, Twitter) 2) Product Support 3) Manuals and Downloads 4) Warranty Info 5) Product Registration: Registering your product gives you access to easy warranty support, convenient opt-in to special promos and offers, faster troubleshooting and service, and quick notification of system updates 6) Samsung Community: A great resource for getting help from Samsung moderators and customers and more 7) …and more product, repair, order, and care options Again, thank you for taking the time to share your thoughts on this product. Your feedback helps us continuously deliver best-in-class products and service. ~ Samsung Solutions