Re: Samsung pn50b550t2f clicking and sound with no picture
Hey, I just changed out my power supply and it fixed the tv. Just wanted to let ya know what I did on my plasma. Good luck to you! Got the part off shop jimmy
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Re: Samsung plasma pn50b550t2f power on/off
UPDATE! received new PCB from shop jimmy, installed new board, hooked up everything (of course 1 at a time) and wouldnt you know it tv works! So after all this, the PCB was faulty. I don't know what is faulty on it but something is. I might work on my soldering skills and change all the caps. Thank you for everyone for your help, first TV repair completed!!!!! Couldn't be happier!
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Re: Samsung plasma pn50b550t2f power on/off
Thanks for the reply, yes I tested ve, vscan, va, and vs for short to ground by putting the red meter lead on the test point and black lead on chassis ground. All fuses checked good for continuity. I wish it was just a bulged cap and I could be done already lol. We will see if the new pcb fixes the problem. If I had a short to ground I would have just replaced the affected board right? I've been looking for ways to test the logic board but having problems finding procedures. I've tested the logic board pins coming from the PCB for resistance...
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Re: Samsung plasma pn50b550t2f power on/off
I'm ordering a power supply, I tested the y buffer for shorts. And from everything I've read it's the most common cause for a tv just shutting down while you watch it. With no audio or picture. I hate shot gun maint. Unless some thinks differently I'm going PCB
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Re: Samsung plasma pn50b550t2f power on/off
Thanks, I reviewed a few different versions and got some ideas of testing for a short to grind through the vs. the main problem is the tv is only on about 3 seconds so reading my test points doesn't really help, unless I was getting a 0. So I'm going to test for a short to ground, test the y buffer for faulty chips. If that all checks good I'm going to just replace the pcb and go on from there if I need to. Input or ideas??
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Re: Samsung plasma pn50b550t2f power on/off
With everything connected the readings before the tv shuts down:
VS 30 VDC
VA 33 VDC
VE 12 VDC
VSCAN -113 VDC
I'm in over my head, thanks guys for your guidance.
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Re: Samsung plasma pn50b550t2f power on/off
My tv was built in 2009. Does that change the way the tv shuts down if your sus boards are disconnected? First time trouble shooter here. Also if I get 0vdc with everything connected then it's likely the Y sus? Which I also should change the y Buffer correct?
Thank you
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Re: Samsung plasma pn50b550t2f power on/off
Thanks for the reply, so with both x and y sus disconnected I get a va of 25 VDC before the tv shuts off. VS measured 79 VDC. I noticed on the pcb it will click on and before it shuts down there is a faint tick tick tick tick tick then it clicks off. Don't know if that's normal or not. So does that reveal any light on the situation? Thanks again
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Re: Samsung plasma pn50b550t2f power on/off
With both x and y sus disconnected it has the exact same issue, it will click on then a couple seconds later power off. So I think the x and y sus are good. Thoughts??
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Re: Samsung plasma pn50b550t2f power on/off
Thanks for your reply. Ok so I disconnected the logic board from the pcb. VA was 0 VDC and VS was 7.5 VDC. Bad pcb? I don't know the whole function of the logic board. I know it controls pretty much everything though. I thank you for your assistance.Last edited by bsickler; 08-23-2016, 04:38 PM.
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Re: Samsung plasma pn50b550t2f power on/off
As requested pictures of the boards. I appreciate you reply. its possible the gold colored cap on the PCB has a slight swelling, but it feels flat. This is my first time inside a tv, so my learning curve is high. ive learned a lot and im happy there are people out there who know what they are talking about. As a quick recap i disconnected the y sus, x sus and the same issue with the tv (ruling out those boards), if i try to start the auto gen test by bypassing the main board and jumping pins 3 and 4 of the logic board i have the same problem...
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Re: Samsung plasma pn50b550t2f power on/off
I totally forgot to load pictures! Hope this helps the chain. Thanks in advance...Last edited by bsickler; 08-20-2016, 08:26 PM.
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Re: Samsung plasma pn50b550t2f power on/off
Hey guys, looking into a new power supply, I can't think of anything else so I'm totally open to ideas from the pros on here. Any recommendations on a trusted company so indoor waste my time ordering a bad board? If anyone has any further troubleshooting ideas in game. Thank you
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Re: Samsung plasma pn50b550t2f power on/off
Ok I just jumped PSon and disconnected the ribbon cable from the logic board and jumped pins 3 and 4 of the logic board. Powered it on and it still clicks on then off. So that tells me my main board is good. Is it fair to say at this point the power supply board requires replacement? Thank you for your help. I greatly appreciate it
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Samsung plasma pn50b550t2f power on/off
Hello, i have a 50 in samsung pn50b550t2f. when i power it on it clicks to turn on, then clicks off. if i leave it plugged in it will continue to try to turn on then power off. I have unplugged my x sus and y sus and problem still remains. If i unplug the t-con board (aka logic board) it will power on but still no picture.
on my pcb i have all the proper voltage at the pins, stand by voltage ect. the only problem with voltages is the VA test point gets to 36 volts before the tv will power off, should be 58 volts. VS is 3 volts, ve 3 volts and vscan is 0, granted tv only powers up...
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