Samsung Plasma PN50B400P3D Won't Power Up.

[photoeye]

When I power the TV on I hear the standard double click, followed by a faint 'tic tic tic' noise from the PSB and then double click and power off. Nothing shows up on the screen. Red light on front of TV lights during power up attempt as well as the green light on the control board.

All boards appear to be very clean with no visual signs of trouble that I can find so far. Caps look great. Back of boards look good as well (haven't pulled out x main yet).

After doing some reading, tried powering up the TV without the Y and X main connected. Like many others, I got the samsung chime and TV appeared to stay powered on even though there was no picture. Hitting the power button triggered another chime and TV powers down. Tried the same test with just Y Main attached and get same original result (couple clicks then gives up).

Because of this test I thought I had narrowed the problem down to the Y Main. Not sure if that is the case or not. I used my multimeter to test the 'things' (sorry, It's getting late) attached to the heat sinks and got some crazy results. I'll attach my chart below. The diagram represents the two heatsinks on the board and the readings I'm getting across all leads.

Not sure what it all means. Would love some advise. I'm new to this.

Thanks in advance.

-Jason

https://www.dropbox.com/s/ot3kihpo0pl7sqx/Ymaintest.jpg

[capkid]

Re: Samsung Plasma PN50B400P3D Won't Power Up.

Your results seem a little odd. I've found that these parts usually fail completely short (0.000). I'd figure on a replacement Y-main. Personally, I'd replace the Y-buffer, also. Be sure to check the X-main.

[photoeye]

Re: Samsung Plasma PN50B400P3D Won't Power Up.

Your results seem a little odd. I've found that these parts usually fail completely short (0.000). I'd figure on a replacement Y-main. Personally, I'd replace the Y-buffer, also. Be sure to check the X-main.

Thanks Capkid. There is another active thread for the exact same TV with nearly identical symptoms. The OP has replaced the Y-main, X-main, then control board and finally PSB with no change in behavior to the set. Hoping to pinpoint the problem before throwing parts at it. The thread has now gone completely cold.

I'm going to get my hands on a better MultiMeter and test the board again.

[capkid]

Re: Samsung Plasma PN50B400P3D Won't Power Up.

I think it's wise to try a different meter, because the readings look strange to me.

[Samsungtv]

Re: Samsung Plasma PN50B400P3D Won't Power Up.

I too have the same issue with my Samsung pn50b400p3dxsa. Has anyone found a solution. If I unplug the power supply to the Y-Main the tv turns on and off, with no picture.