Re: Samsung PS50 plasma TV crackling noise
I have exchanged the diode and the crackling did not appeared so far. I will follow it for some time.
mvata10
Member
Last Activity: 08-30-2012, 03:36 PM
Joined: 08-26-2012
Location: Prague
-
Re: Samsung PS50 plasma TV crackling noise
I have used 220 uF caps as the mains. I will try exchange the diode and see although I dont really think this will solve the problem. I would exchange also the trasformer however it seems to be impossible to get the right type. I have ordered a new board anyways.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
TV ran normally as far as I could see. I did not wanted anything to burn out so I ran it only a short time, however, I did not notice any significant change. 100Hz noise would not be visible by the eye anyway, I think.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
I have changed the main caps and this did not resolved the crackling. Then I changed the 2J105J and again it did not helped. Then I removed the transformer left to 2J105 and the diode right to it and try to power the board and no problem - no noise - TV running normally. Then I put the transformer back and powered the board again - again no problem. When I put back the diode, noise again started. The diode is 1N40078 and is at the the input of VCC_PFC circuit. I will try to change it and if it does not work I go for a new or used working...Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
Thanks a lot. I will try it and write the result.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
450V 150uFLeave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
I do not have another battery of that kind. The meter reads 233 V at my AC outlet.
I also tried to simply test the caps with my simple multimeter on the resistance scale, the 3 caps charges at both polarities, the 2J105 only at one polarity. Don´t know it it means anything.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
First, I measured the main caps when the noise was present, there was 425 V in all of them. I did it once again when the noise was not there, and there was only 315 V in all of them. When the crackling started again, there was again 425 V.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
I think it is the 2J105J, I have used a tube for listening when searching for the source of the noise. I have also changed the power cord. The other possibility is that the failure is in the AC noise filter attached to the AC plug as the noise comes simultaneously also from it (and only simultanously). I can´t imagine how these two phenomenons could be interconnected. However, I used another cable to connect wires directly to the PSB bypassing thus the noise filter and the crackling was still present.Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
1. I had to wait for 8-10 minutes for the noise to start after switching on the TV. Loudspeakers are disconnected.
2. There is no noise or almost none if a free channel with no signal is selected.
3. If there is a white or brighter area on the screen, the noise appears. I.e. simply going to menu increases the noise. The area may be small.
4. The noise if louder if the screen is white in VGA mode and cracling has higher frequency.
5. The biggest difference makes the switching off the energy saving and chosing...Leave a comment:
-
Re: Samsung PS50 plasma TV crackling noise
Yes, the intensity of noise varies with the scene change, however, I would not say it depends only on the brightness.
I have only a simple multimetr, can you tell me how to test the capacitors?
Thanks
MartinLeave a comment:
-
Samsung PS50 plasma TV crackling noise
Hi,
I have plasma TV Samsung PS50. From time to time it makes loud noise, now it is almost permanent and very annoying. I sent it for warranty service but they returned it I think without any repair. Now the warranty is gone and I decided to try to repair it myself.
1. the sound comes from power supply board BN44-00274B and is caused probably by the capacitor CP801 which is marked 2J 105J SIC 460S (see pictures 1 and 2)
2. a similar sound comes also from noise filter located in the power cord plug IF2-NO6AEW (see picture 3)
3. the noise filter is quiet while unplugged...
No activity results to display
Leave a comment: