This TV turned on with no backlight. Since there was no backlight flash, there was possibly an open LED in the string. Westinghouse uses the same white label Chinese TVs as RCA, Proscan, Haier and many other brands. The firmware in these sets do not give the user the ability to adjust the backlight level.
This TV was difficult to open up. The outer bezel was held in place by screws and metal tabs that had to be released by sliding a black plastic tab. It was also double sided taped to the panel. In this scenario, I leave the bezel attached to the panel when removing it.
Once open, I found one open LED which I replaced with a Samsung-compatible 3V module. All the LEDs were a bit brown showing signs of both heat and wear. The backlights were wired as one long string with 4 rows of LEDs. Once assembled, I tried the usual combination for RCA TVs to get into the service menu to turn down the backlight level but was unsuccessful. Googling found a working code. With the TV on, press menu-0-0-0-0 on the remote. To get to the backlight setting, go to Other -> Panel Settings. The default value setting for Energy Savings was very high at 90. I reduced to 55 which saved it under User picture mode. This step needs to be done on all inputs.