I've got a Samsung 50" plasma model PN50A550S1F that I've owned for about 4 years and have put alot of hours on it. For a few months now it's been having issues when I first turn it on. It will come on and then shut down after a few seconds and repeat this until it will finally stay on. Then I have to wait a bit before sending a signal to it or it will start power cycling again. Today it would turn on but no picture and then a few seconds later it would turn off and then back on again (relaying clicking) and just keep repeating this.
After reading some very useful information on this forum, it sounded like my power supply or main board could be the culprit. So I started with the power supply board. No blown fuses or smoked components. There was one cap that was bulging a bit at the top but when I checked it with my ESR meter it wasn't too bad (I've measured brand new caps with the same uF that showed the same level of ESR as this one). I will probably replace it anyways for good measure.
In between shut downs, I measured the voltages at Va and Vs and both were right where they should be (57v and 204v respectively). So I unplugged everything from the power supply except the incoming AC and connected a 220ohm resistor from PS-On to GND and another one from VS-On to 5.3v. When I did that, the power supply fired up and the relay clicked and it stayed running without shutting down. Va and Vs voltages were good as well. From what I can tell the power supply is fine.
So, does this sound like the problem is with my main board? Seems to be a common issue with this set. If so, any recommendations on a reputable place to buy one?
Thanks!
After reading some very useful information on this forum, it sounded like my power supply or main board could be the culprit. So I started with the power supply board. No blown fuses or smoked components. There was one cap that was bulging a bit at the top but when I checked it with my ESR meter it wasn't too bad (I've measured brand new caps with the same uF that showed the same level of ESR as this one). I will probably replace it anyways for good measure.
In between shut downs, I measured the voltages at Va and Vs and both were right where they should be (57v and 204v respectively). So I unplugged everything from the power supply except the incoming AC and connected a 220ohm resistor from PS-On to GND and another one from VS-On to 5.3v. When I did that, the power supply fired up and the relay clicked and it stayed running without shutting down. Va and Vs voltages were good as well. From what I can tell the power supply is fine.
So, does this sound like the problem is with my main board? Seems to be a common issue with this set. If so, any recommendations on a reputable place to buy one?
Thanks!
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