TV will not power up, just keeps clicking - Samsung UN55B8000 55 in. LCD HDTV

TV won't turn on - Forums - CNET

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CNETJun 11, 2015 - I have the Samsung FP-T5084 50" Plasma tv. I went to turn it on the other day, and it wouldn't turn on. No clicking. No red power indicator light. Nothing. Samsung TV LN52A650A1FXZA won't turn on, keeps clicking
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How do you fix a television that won't turn on? - Ask.com

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I would have the power supply filter capacitors checked, especially the 24vdc circuit

Does the set just click on and then right back off? Do you have Flashing power Light on Front or is TV playing with Loud Clicking?

Nothing to do with connecting the TV to the stereo, more likely you are having power supply failing, the clicking sound is from power relay, the power supply may have unstable DC due to bad DC filter caps, bad solder joints or loose connections.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Please post back what you find.

The tv power supply board is dead.That the board where the power a/c cord go into it.That the power supply board it dead.Tries websites like Shopjimmy.com Ebay.com to buy a refurbish power supply board for the replacement

the power supply section of ur tv is not correct....
u have to change some capacitors in power supply section in circuit board in ur tv.

Check for leaky capacitor in the switching relay area

The power board ic coverter it dead.
U need to replace the power board.
U can go the web and buy this board changes
or get the tv repair man replace part and labor $575.

First the main bd controls the "Turn on" sequences". When you press the Power on button the Main bd sends a "Turn on" signal to the Power supply. The clicking you hear is the Power on relay ativating. If the tv does not turn on and the relay keeps clicking then you might have a bad Main bd or there is s shorted board somewhere else in the set. The Power supply can also be bad. Have a trained Samsung tech troubleshoot the set.

ur relay keep try hard to turn tv on that u hear clicking noise.
+5VDC is leaking! open back cover,check power supply board.
1000uF or 2200uF capacitor is popped open or leaky.replace with known top quality capacitor.do it ur self repair will save u $200.