Look for broken connections on all the connectors for each strip that doesn't light.
Have you tried to swap strips (one that lights for one that doesn't)? You might be able to zero in on a possible bad connection/strip. The circuit for these backlights actually goes from one to another - one break in a connection will kill the whole circuit.
Thanx for the reply.. Yea, I swapped around the LED strips and also used my LED tester and confirmed that all 5 of the strips are fully functional...
So this CORRECT power supply board picture was also installed in ANOTHER VIZIO E420i and it works?
But no matter what, this board also has two LED driver circuits so the Voltage (V out1, V out2) at the Anode of each string should be > 100V, but per your measurement, one does not really have any output at all.
I swap the boards and there are minor discrepancies. On the full working unit, the voltages are about 1 volt off... On the unit with the outer LED strips off, the voltage on #2 is about 64-67 volts instead of 92-98 volts...
I got in a 3rd E420i that had a LED Strip issue.. Turns out it was a simple replace the strip fix... Replaced 3 strips that had bad LEDs and it was golden..
But, since I had it broke down, I decided to test some different parts on the one that was giving me nosebleeds.....
I replaced the green power strip... No difference.... Wracking my brain and looking over it all, the *ONLY* part I haven't swapped out is the small connector that goes from the Power PCB to the green LED Power Strip...
Yea, it's weird.. I cleaned the connections on that bad cable and plugged it in and it worked.. But then I tried it again a few mins later and it didn't..
Thinking I'll either rewire the thing or just order a new one...
But it's really kewl.. THREE working VIZIO 42" LED SMART TVs...
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