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I have a Samsung LCD TV and it won't turn on - Samsung LN52A550 LCD TV

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A common problem with samsung flat panel tv's is that the capacitors on the power supply fail.
You will need to remove the back and check the power supply pcb for puffed caps. To do this you will need to lay the tv face down on a cushioned surface and remove all the screws that secure the back of the tv. You will need a surface large enough to support the whole tv. This is to protect the panel. DO NOT place tv on surface where the front of the tv is not supported by the frame.

Remove the back of the tv and check for puffed caps on the power supply pcb. This is the board that the power cord is attached to.

If there are any puffed caps, you will need to replace them with equal or slightly higher valued caps.The value ratings are printed on the capacitors in mfd and voltage.

You will need a soldering iron to remove and replace them.

After reinstalling the power supply and before you put the back on, hook up a power cord to the tv and try turning it on. If you see a backlight come on, the tv is working. Try hitting the meny button and see if you have an on screen display. If you do put the back cover back on.

If tv doesn't power up, then the power supply pcb is probably bad. Try checking the voltage outputs from the connectors on the side of the pcb. Use a digital multimeter, connecting black lead to chassis ground and read lead to check voltage on the pins of the connectors. There should be voltage levels printed next to the connector on the pcb. Let me know if this helps you.

Posted on Apr 04, 2011

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