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Samsung 52" ln52a650a1fxza Turns on and backlight goes off after 10 seconds

TV turns on and then after 10 seconds the backlight goes off. If I turn the TV back on, the backlight goes off quicker than before. I've replaced all the capacitors on the power supply board with no change.

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  • John W Nov 08, 2012

    Bad inverter? or bad lamp somewhere?

  • John W Nov 15, 2012

    Replaced the inverters and was able to get the set to now stay powered on. If the brightness of a picture is too bright, it will flicker and eventually the backlight will go off. I was able to turn down the backlight and brightness in the settings and it stays on, but it's too dark. Also, AV1 and AV2 don't work, only the cable input works.

  • John W Nov 15, 2012

    I can see what appears to be a faint darker line near the bottom. I think I have a bad bulb in this unit. The bulb transformer near that section does make a huming noise. Should I remove the transformer and do the jumper trick?

  • John W Feb 15, 2013

    It was a bad bulb. Found a replacement bulb online, replaced it and now it works fine. Was a real pain though to get inside the panel. Had to take the whole TV apart!

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SOURCE: Samsung model LNT5271f excessive relay cycling before full power

Howdy,
Yes, it is very easy to repair. Solder iron wattage should be at least 300 w.

The PSB is the center Board (towards left) after you remove the back off the TV. Remove the shield that covers the Boards and remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.

Good Luck, big IRISH.

Posted on Dec 28, 2009

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SOURCE: Which Replacement Power Board for LNT4665F Samsung LCD TV?

Howdy,
It would be a lot cheaper if you just replace the two caps that have gone bad. Just get a cheap solder pencil from the store and about an inch of solder and you are in business.
The Power Supply Board is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.

Thaks for using FIXYA, BIG IRISH.

Posted on Jan 02, 2010

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