Introduction
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.
Tools
Parts
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Be sure to unplug the TV from the main wall outlet.
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Carefully lay the TV screen down on a clean flat table with the back side facing you.
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Using a #3 Phillips head screwdriver, remove the screws holding the back cover on.
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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.
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Using the #3 Phillips head screwdriver, remove the screws holding the power supply board on.
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Unplug the connectors connected to the board setting aside and carefully noting placement for later connection to the new board.
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Insert the new power supply board into the location where the old board was located.
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Follow the previous steps to connect the cables and screw in the screws.
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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.
One comment
Power supra wod
Sajeev G -