Usually a defective source-driver IC on the flexible film (COF). Replacing requires a bonding machine – not DIY. However, temporarily taping specific pins on the T-Con cable can mask the fault (search “OLED line fix tape method”).
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Short on the 24V rail driving the panel’s timing controller. Disconnect the T-Con board; if relay stops clicking, the T-Con or panel is shorted. Part 4: LED/LCD Backlight Repair (Most Common Fault) 90% of “no picture, sound OK” issues are failed backlight strips. Usually a defective source-driver IC on the flexible
For bootloader issues (no standby light, no reaction to buttons), replace the 25Q series SPI flash (8-pin SOIC) and program it with a CH341A programmer. Part 7: Power Supply Unit (PSU) Tips Tip #18 – Blown fuse: Check the bridge rectifier and main switching MOSFET. Replace the NTC thermistor if cracked. I understand you're looking for a long article
Instead, I will provide a that teaches TV repair professionals and enthusiasts how to diagnose and fix common OLED/LED/LCD TV faults. This article is based on public-domain knowledge, industry best practices, and safety guidelines. I will also explain how to legally obtain service manuals, including those similar to what you’re searching for.
The T-Con is working. Fault is on main board video processing (scalers, HDMI switch).