MY SAMSUNG LNS4051 LCD TV WIN'T TURN ON (CLICKS AND 4 RED BLINKS)I HAVE READ ALL THE POSTS ON THIS AND REPLACED THE CAPS ON THE IP BOARD.STILL SAME PROBLEM.JUST BOUGHT A BRAND NEW IP BOARD FROM THE PARTS STORE FOR 175 DOLLARS AND STILL WON'T TURN ON .I READ A POST SOMEWHERE THAT YOU HAVE TO SHORT THE EPROM SOME TIMES .DOES ANYONE HAVE ANY KNOWLEDGE ABOUT THIS ?

SOURCE: Power wont come on... red light blinks... hear clicks but no pix

There are many reasons as to why the tv can default to service mode (blink codes) and may have nothing to do with the power supply board. Flat panel tv technology incorporate intuitive interrupt circuits designed to prevent catastrophic failure regardless of the boards functionality.

Some root causes to this condition may be:

1 Bad inverter board (step-up hi-voltage CCFL)

2 faulty regulator control board (data timing)

3 faulty interface processing board(s) (signal switching)

4 faulty power supply board (main voltage)

5 Bad LCD driver circuit, or faulty LCD panel its self.

6 faulty scan circuits.
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To diagnose and solve these particular circuit scenarios require a professional service technician. Any of the problems above would take around 35 minutes and 100 bucks to repair at a service center.

But if you insist on fixing it yourself I can try to help you determine which board is possibly defective. I do have schematics for this chassis. If you have a multi-meter and 5mhz oscilloscope we can get started. These are the 2 instruments needed to check for critical waveforms and voltages according to the schematic data. It could be any circuit in the tv causing this condition.

The components on the circuit boards that could be defective are as follows:

Diodes
Transistors
Inductors
Resistors
Transformers
Crystal oscillators
Filters
Relays
Transducers
Capacitors
IC chip arrays
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Modular causes to this condition may be:

poor resistance too ground
high current too ground
over voltage
under voltage
over current
under current
shorted switch actuation

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Software related blink intervals:

Parental locks
Sleep mode
Hidden key commands (test mode servicing)

"though if in this blink category the tv should come on requiring password. So this is unlikely....

SOURCE: I replaced the 4 capcitors on the panel and the TV

Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.Put the old IP board back.Tries it again should work,if u didn't not burn anything in the Tuner signal board. Keep me in touch how it turn out!

SOURCE: Samsung TV won't turn on- trying to fix it. A challenging problem

People if you can fix your tvs thats great! However please understand there is a incredible amount of HIGH VOLTAGE running through any television and if you do not know what your doing it can be fatal. please be careful.