Vizio e400i-b2 turns on backlights flash

[budm]

Re: Vizio e400i-b2 turns on backlights flash

One thing I do not know about the ACDET signal on this board if it it is LOW (<1vdc) ACV feeding the TV is GOOD (within the ac opersting range for the TV) and goes HIGH if the AC LEVEL is out of range, or if it is HIGH (>2.5vdc) when the AC feeding the TV is good and it goes LOW when AC is bad.
But I would expect the PS-ON to go low to shutdown the power supply if the ACDET detects problem.
So if you indicate that the PS-ON is present (>2.5VDC) but you do not have the switched 12VDC or the switched 24VDC, then you have power supply problem.

[budm]

Re: Vizio e400i-b2 turns on backlights flash

BTW, I notice that there are cables between the LED driver board and the main board, so there may be some error signal from the LED driver to the main board.
But if there is any error then I do not expect the PS-ON to be present when error occurs.
CN2 on the LED driver board does not have any labels to show the pin functions.

[nwcs]

Re: Vizio e400i-b2 turns on backlights flash

Replaced the led driver board with one from shop jimmy and still same issue. I am wondering if it could be a led problem even though I verified all of them firing.