I have always liked this set and the picture has been great. However, a couple of weeks back (during the football 
) we had a small power cut, a few seconds at best. The TV turned off and on and was fine. For the next few days it turned itself off and on a couple of times until eventually it turned off and stayed that way with just sound coming back briefly for around a minute. When unplugged at the mains and re connected it turned on but no standby light, the led just flashed 5 or six times so something was on but no picture.
The result is I now have a 55 inch lg (not oled) which is nice but I do not think the tv is as good for films so I want to fix my plasma.
I removed the back panel and noticed that the green led on the logic board was not flashing at all, not even lighting. I tested a few voltages as per threads here but was not getting the readings expected. I bought a replacement logic board, I now have standby, the set turns on and off with the remote and the green light flashes every second. However still no form of screen activity.
I have the set in a separate room now with no input source which does not help but I expected to be able to see something on the screen, even the Samsung test screens do not show when I short the logic board clips as per their video.
I have taken readings and some appear very wrong.
They are as follows,
In standby I have a 5.2v reading on the standby plug
PS on also has 3.28v so all good there.
When I check PS on at switch on it goes from 3.28 to 168v, according to the Sammy video this is wrong and should be 0?
VS on at turn on give 3.29v so that is fine.
VA should be 58 and reads 58
VSC should be -187 and reads -186.2
VS shold be 207 and reads 207
BUT VE should be 80 and reads 191.3. How did this happen?
So as far as I can see I have two incorrect readings and thought it was best to get help at this time before going any further.
This is a view of the set as it stands. I cannot see any problem capacitors or problem areas.
"y" side
"X" and main.
Power supply
) we had a small power cut, a few seconds at best. The TV turned off and on and was fine. For the next few days it turned itself off and on a couple of times until eventually it turned off and stayed that way with just sound coming back briefly for around a minute. When unplugged at the mains and re connected it turned on but no standby light, the led just flashed 5 or six times so something was on but no picture.The result is I now have a 55 inch lg (not oled) which is nice but I do not think the tv is as good for films so I want to fix my plasma.
I removed the back panel and noticed that the green led on the logic board was not flashing at all, not even lighting. I tested a few voltages as per threads here but was not getting the readings expected. I bought a replacement logic board, I now have standby, the set turns on and off with the remote and the green light flashes every second. However still no form of screen activity.
I have the set in a separate room now with no input source which does not help but I expected to be able to see something on the screen, even the Samsung test screens do not show when I short the logic board clips as per their video.
I have taken readings and some appear very wrong.
They are as follows,
In standby I have a 5.2v reading on the standby plug
PS on also has 3.28v so all good there.
When I check PS on at switch on it goes from 3.28 to 168v, according to the Sammy video this is wrong and should be 0?
VS on at turn on give 3.29v so that is fine.
VA should be 58 and reads 58
VSC should be -187 and reads -186.2
VS shold be 207 and reads 207
BUT VE should be 80 and reads 191.3. How did this happen?
So as far as I can see I have two incorrect readings and thought it was best to get help at this time before going any further.
This is a view of the set as it stands. I cannot see any problem capacitors or problem areas.
"y" side
"X" and main.
Power supply
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