Hi!
I am working on a Samsung PN60E530A3FXZA and had some questions. The power supply looked pretty bad. There where heavy burn marks on the two thermistors and all the traces on the cold side from the larger transformer. For the larger transformer, there was discoluration on some of the traces for the hot side as well.
I have seen other SMPS's for this panel that looked similar and replacing the thermistors did not fix the issue. The thermistors readed short circuit.
Anyway, replacing the SMPS wasn't too expensive and I did along with the Y-Sustain board, which had bubbling on the board there in one spot.
This brought life back into the plasma. I adjusted the various voltages, and these are what they are supposed to be, what they where and what I adjusted them to:
I only have a couple questions here. I have only repaired one other plasma and that turned out to be a guessing game mostly at what board was causing what problems. I have tried to learn much more about plasmas since I received this one to repair.
I want some clarification on what effects these voltages have on a Plasma Display Panel. I have searched the net, and so far, the best explanation I could find comes from Tom66, here at BadCaps.net
It is my understanding,
Va means Voltage Address for the X-Sustain and is for the address boards, is that correct? Incorrect voltage could mess up the picture on the panel, because the addresses are wrong, is that correct?
Ve is Voltage Erase and is what "erases" the cell(s). So, if Ve was not correct, we could receive Image Retention. Is that correct?
VScan = Vertical Scan (?) and has something to do with Y-Sustain. I am not exactly sure if I measured this correctly, because I see some places on the net says it should be measured across a resistor or capacitor because it's floating.
VS = Voltage Sustain and powers up the Y-Sustain (?)
I believe I was supposed to let the TV "warm-up" powered on for about 15-20 mins before adjusting the various voltages, and I did not do that. Now there is image retention on the panel. It goes away real quick if the white bars display on the screen. However, I feel they shouldn't stay like they do, and I'm going to have to remove the cover to adjust them again. I just wanted a better understanding of what the voltages did, and what the symptoms would be if they were off.
I am working on a Samsung PN60E530A3FXZA and had some questions. The power supply looked pretty bad. There where heavy burn marks on the two thermistors and all the traces on the cold side from the larger transformer. For the larger transformer, there was discoluration on some of the traces for the hot side as well.
I have seen other SMPS's for this panel that looked similar and replacing the thermistors did not fix the issue. The thermistors readed short circuit.
Anyway, replacing the SMPS wasn't too expensive and I did along with the Y-Sustain board, which had bubbling on the board there in one spot.
This brought life back into the plasma. I adjusted the various voltages, and these are what they are supposed to be, what they where and what I adjusted them to:
Code:
VScan: -194VDC, was -204.6VDC, adjusted to -194.0VDC Vs: 211VDC, was 208.7VDC, adjusted to 211.0VDC Va: 57VDC, was 56.7VDC, adjusted to 57.0VDC Ve: 98VDC, was 94.6VDC, adjusted to 97.9VDC
I want some clarification on what effects these voltages have on a Plasma Display Panel. I have searched the net, and so far, the best explanation I could find comes from Tom66, here at BadCaps.net
The Va is determined by the panel technology including the spacing between the address and sustain electrodes and is typically fixed for any given panel technology. Excessively high Va can damage the plasma panel TCPs rendering the panel dead. The Ve is also determined by the panel gas pressure and is much more variable, it determines the erase/initialise bias energy for the common electrode side of the panel.
Va means Voltage Address for the X-Sustain and is for the address boards, is that correct? Incorrect voltage could mess up the picture on the panel, because the addresses are wrong, is that correct?
Ve is Voltage Erase and is what "erases" the cell(s). So, if Ve was not correct, we could receive Image Retention. Is that correct?
VScan = Vertical Scan (?) and has something to do with Y-Sustain. I am not exactly sure if I measured this correctly, because I see some places on the net says it should be measured across a resistor or capacitor because it's floating.
VS = Voltage Sustain and powers up the Y-Sustain (?)
I believe I was supposed to let the TV "warm-up" powered on for about 15-20 mins before adjusting the various voltages, and I did not do that. Now there is image retention on the panel. It goes away real quick if the white bars display on the screen. However, I feel they shouldn't stay like they do, and I'm going to have to remove the cover to adjust them again. I just wanted a better understanding of what the voltages did, and what the symptoms would be if they were off.
