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I was given a free Samsung Television model LNT4669FX-XAA that wouldn't power on that I found on offerup.com.

I've found other free TV's on craigslist.org, letgo.com and other online sites. These are good sources of electronics to practice on if you are a student, hobbyist or whatever compels you to save some electronics from going into the junk yard. Enough of the electronics restore, repair, re-use and recycling advocacy.

The gentleman that gave me the TV noted that his father had tried to repair the TV before and it worked for a day. He wasn't sure what his father had worked on.

When I brought the TV home and plugged in, I found it did nothing.

I took off the back cover and found a blown fuse and an assortment of new capacitors that I wasn't sure were even in specification.

I decided for the price of a new board, I'd buy a new board (found for ~$20) off eBay and try repairing the old board later with a Shopjimmy.com board repair kit.

I replaced the power supply board and the TV is performing up to specification from what I can tell now.

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    • Be sure to unplug the TV from the main wall outlet.

    • Carefully lay the TV screen down on a clean flat table with the back side facing you.

    • Using a #3 Phillips head screwdriver, remove the screws holding the back cover on.

    • Thoroughly clean the cover and boards using a damp towel (I like to use 91% isopropyl alcohol) and if heavily soiled use a vacuum with a brush.

    • Using the #3 Phillips head screwdriver, remove the screws holding the power supply board on.

    • Unplug the connectors connected to the board setting aside and carefully noting placement for later connection to the new board.

    • Insert the new power supply board into the location where the old board was located.

    • Follow the previous steps to connect the cables and screw in the screws.

    • Follow the first step in reverse to install the back cover.

    • Plug the power cord into a wall outlet and power on the TV to verify performance.

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To reassemble your device, follow these instructions in reverse order.

You can also repair your Power Supply Board potentially by using the BN44-00166C repair kit.

See the Attached Documents schematic for further Power Supply Board details.

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James Finch

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