Thursday, July 11, 2013

Vizio VO370M Power Supply/Backlight Inverter Replacement

Typically, I write blog posts about books I've written or will release. I'll also write about things that interest me.

Today, I try to help out the community with a technical issue I ran into. It was very hard for me to find a clear, definitive answer to the problem I had, so I'm making this post to help others out there find the answer.

Someone I know had a Vizio TV that stopped working. He bought a new one and I asked if I could have the broken one to try and fix it. It's possible that the symptoms and resolution I list below apply to other brands and models of televisions that have a similar problem.

The TV is model number VO370M.
After receiving the TV, here are the symptoms of the broken television:
  1. The TV powers on, with the orange Vizio logo turning white.
  2. The monitor turns on, showing a black screen, for one to two seconds, then quickly shuts off.
  3. There is still sound coming through the speakers even when the monitor shuts off.
  4. The white Vizio logo stays on through all of this.
After doing a thorough search of this problem on the Internet, I came to the conclusion that the reason the screen shut off was because the Backlight Inverter was bad. There are a few ways to check this, but I don't have soldering irons or voltage meter checkers to see if the connections are bad anywhere. So instead, I replaced the Backlight Inverter completely.

Part 0500-0405-0900 Power Supply/Inverter
On this TV, the Backlight Inverter is part of the Power Supply board. It's a fairly large piece that you can get to by taking the back off the TV. When open, the Power Supply is on the left side (where the electrical plug connects).

For my TV, the part number to replace was 0500-0405-0900. The part number is listed on the Power Supply. It's the white sticker on the left middle area in the picture above. Be mindful to check this, because this same model of TV could have a different type of Power Supply.

To remove the Power Supply, simply disconnect the two wires that go into it. Then remove all the screws that secure it to the TV set. It will then slide out. At the end of this post is a video showing the process.

I went on eBay and set up a search for this part number. Within a few days, eBay notified me that someone was selling the part for $69. Searches for the part at online TV parts stores that specialize is this showed that the item was backordered everywhere. I'm guessing they don't make it anymore. I bought it on eBay, put it in, and presto! The TV once again shows a working screen.

Vizio VO370M - Working and waiting for a signal after replacing Power Supply/Inverter
While I can't guarantee this will fix your TV if you have the problem, the chances are good if you see all the symptons I list above.

Hope this helps someone out there trying to save a few bucks on buying a new TV or salvaging a used one.

If you would like to show your appreciation for my efforts in helping you, all you have to do is buy one of my books. There's plenty to choose from by clicking Books Available In Print & Digital or The Permanent Man Episode.