1 VIZIO D50U-D1 Backlight starts up but then turns off and TV restarts
I have the VIZIO D50U-D1 and anytime I power off and on the the TV the vizio logo comes up then everything goes black. If i use a flash light I can see images. Also I have noticed that tv is restarting itself. I have tried some diagnostics, verifiying I am getting 3V at the ON/OFF pin of the power supply board. I have also measured the voltage going to the driver board and the voltage going to the led strips. The voltage supplied to the driver board stays constant, I believe it was 24V. Monitoring the voltage going to the LED strips I was getting 35V when the backlights worked, but the voltage dropped as the backlights fades out. I replaced the driver board with no luck. Any suggestions as far as should I look at the LED backlights? Or is there any other way to check if the main board is functioning correctly?
I have attached images of the power supply, main board, and led driver board. I drew red boxes around the pins I was measuring the ~35V. But my main question is what could be the problem that the backlights work when I power the tv on, but after the vizio logo they stop working?
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Allen Locke this "I was getting 35V when the backlights worked" does not sound right. That voltage is pretty low. Post some good pictures of your boards with your QUESTION. Let's see if we can assist you. AS you probably already found out, schematics are not available so we will have to see what we can come up with.
Adding images to an existing question
из oldturkey03