Samsung PN60F5500AF Won't Turn On

[TVTyler]

So I got this TV in hopes of repairing it. I was trying to figure it out on my own, but haven't really gotten anywhere. At first I thought it was the power board because when plugged in it would only flash the stand-by light five times, stop for a few seconds and then do it again.

However, after replacing the power board it still does the same thing. It will flash the red light five times and makes a slight humming beep noise if that makes sense. Also, the screen does light up, it just doesn't display anything. It just lights up black.

Another thing I noticed is that on the main board the green indicator light does flash on and off repeatedly. I tried disconnecting the T-Con board but with that disconnected it still does the same thing.

Would this be a main board issue, or it could it be something else entirely?

Any help would be appreciated, and I can also post pictures up if need be.

Thank you!

[TVTyler]

Re: Samsung PN60F5500AF Won't Turn On

I figured I would go ahead and take some photos of it and attach them here.

[dick_barton]

Re: Samsung PN60F5500AF Won't Turn On

What voltages do you have on each connector shown?
VS=
VA=
etc

[TVTyler]

Re: Samsung PN60F5500AF Won't Turn On

The readings I am getting fluctuate all over the place, they range from okay to nothing. The TV appears to cycle on and flash a back-light and then it cycles off again after maybe five seconds. Then it comes back on and repeats the cycle.

I did however use my other Samsung's remote and the TV does respond to it when I press the power button. It just causes it to turn on and display the same symptoms. Not sure if that is relevant or not.

And when I disconnect any of the boards from receiving power it just appears to run the same symptoms. Only one I can't disconnect and see is the main board since it is linked directly to the power button and the receiver for the remote.

When I disconnect the Y-Main board it just stops the screen from lighting up is all. So I don't know if it could be related to that.

[AGorowski]

Re: Samsung PN60F5500AF Won't Turn On

I'm currently working on the same model. Have you tried forcing a colour test? On the main logic board near the top are four holes numbered 1 to 4. With the power off jumper holes 3 and 4 with a bent piece of copper wire. Once the jumpers in place power on the tv and see if it cycles through the colours.