According to the schematic, U3's pin 2 (EN) must be above 1.5V. Measure it – you see 0V.
Replace FB3. Now U5 gets 3.3V, GPIO17 goes high, U3 turns on, and the 6V rail appears. The display works. y320an01s4lv06 circuit diagram pdf new
Bookmark this page, gather your multimeter and oscilloscope, and download the authentic PDF from the trusted repositories mentioned in Section 3. Good luck with your repair. Have you successfully repaired a Y320AN01S4LV06 board? Share your experience in the comments below. If you found an even newer revision of the circuit diagram, please post the link (ensure it is safe). According to the schematic, U3's pin 2 (EN) must be above 1