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New Power Supply Failure

I have a Vizio V655-G9 that wouldn’t turn on after a suspected lightning surge. I ordered a new power supply thinking this was the logical culprit. After installing the new power supply board I plugged the tv in to test it and I immediately heard a pop from the new board. Tv still won’t turn on. What would cause this?

Image 1: Original Power Supply

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Image 2: New Power Supply

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Image 3: Main Board

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Image 4: Fuse Voltage

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Image 5: Line Voltage

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Image 6: Pin Diagram

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Image 7: Old PS Bottom

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Image 8: New PS Bottom

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@brahn85 don’t know because we do not know what popped. Let’s find out what is going on with your TV. Instead of just replacing the board you should always check the power supply on the connector where the main board connects to. It is actually the main board that tells the power supply to turn on. On the flip side of this since this was a power surge, it could be both boards that went on the fritz. I would suggest that you get your camera out. take some really good pictures of your boards and post those with your QUESTION. That way we can see what you see. After that use your multimeter and check the output of the board. You must have standby (STBY) power. If you have that it is not your power board that has failed. Ajout d'images à une question existante

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@oldturkey03, thank you for your response. I have added a picture of the original PS, new PS and main board. I have inspected pretty closely and none of the boards show any sign of physical damage (ie burnt circuits/bulging capacitors/etc.) I'm happy to test whatever you suggest but if both boards were indeed bad to begin with, could the bad main board caused my new PS board to fail as soon as I plugged it in? In which case I wouldn't actually be able to properly test the new PS? Thanks again for any and all help.

par

@brahn85 the main board should be doing this. Unplug your set and test the fuse F100 for continuity. I am not sure what it is with your images but they are a bit small so it is hard to see. BTW that power supply is identical to the one you removed? There are a few different versions so just making sure. Commonly it is the main board which generates the PS-ON. Vizio main boards have common problems with the voltage regulator IC's. with your TV connected check the voltage on PS-ON pin when you press the power button. Does that voltage go up or stay low (off). Set your meter to something like 20VDC Black probe to good ground and red probe to pin PS_ON. Keep your hands of the power supply board since that could lead to a shocking experience.

par

@oldturkey03, tested the F100 fuse on both the old and the new PS and both have continuity. Additionally, if it matters, with the PS plugged in, I get 65ACV at the fuse.

I am confident that the two PS boards are the same. They have the exact same part number and are visually the same.

I tested all 16 pins at the main board with my auto meter set to ACV and DCV and tested them without touching anything as well as tested them while pushing the power button and all tests resulted in 0V. Does this mean the main board is bad? One of the pins should have standby voltage without even touching the power button, correct?

par

@brahn85 yes, you should have some standby voltage. You get 65VAC on the fuse? That is odd. I am assuming you are in a place where household voltage is 110V.

Check the voltage going into your TV and take a good picture from the bottom side of the power supply. Something is wrong here ;-)

par

@oldturkey03, I'm not entirely confident I know how to test for standby voltage but I believe that I should have (12?) voltage on one of the pins coming from the main cable that connects the PS board and main board. As stated previously, I have 0V on all pins with the PS plugged in.

Yes, I get around 65-66V on either side of the fuse when the PS is plugged in. (See picture above)

Yes, I have 120V at my house and you can see that I am getting that voltage when just testing the power cable (picture attached above).

par

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Bryan Rahn sera éternellement reconnaissant.
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