This TV has a standby light but wouldn’t turn on or respond to the on/off button on the remote or side buttons. I was able to get it turn on randomly however.
Typically the suspect in these cases is the main board. I froze the EEPROM with an upside down can of duster and was able to get it turn on a few times. The part number for UF1 was W25Q16BSIG (16Mbit flash). I was able to read the contents with my CH341 programmer and I experimented by programming it into W25Q64BV (64Mbit) flashes I had. With new and larger flash installed, there was no standby light. I erased the original flash, reprogrammed it, and reinstalled it and it does appear fixed.
I have ordered the 16Mbit ICs in case the TV comes back with the same problem. I also turned down the backlight in the service menu to level 60. In this model, it needs to be done on all inputs and is saved under the User picture mode.