Joined: 12 Oct 2012
|Posted: Fri Oct 12, 2012 8:42 am Post subject: Samsung pn50a550s1fxza plasma on off power
I have a Samsung pn50a550s1fxza.
That has the power board bn44-00222a
My Tv takes about 15-30 minutes to turn on. It will cycle on and off on its own when attempting to start. When it does start it will stay on untill I shut it off. I can leave it all day and it wont shut off. I have read that caps may be an issue. I took a look and all of mine look fine. I repaced all the 1000uf and 2200uf for good measure but did nothing. I did see that I had one cap that was blown apart and that was one labeled 4700 j 400mkt. It was the top one out of the two. I replaced it with a .0047 500v that I found at a shop near me.
I can get power to the tv when all the plugs are taken off the power supply board except the one cluster of wires that has 12 pins on top and bottom. So 24 wires total. This is the wire harness that goes to the imputs board where you connect the hdmi,svid and such. When I take this wire off I get 0 power at the main wires or vs, anywhere.
I have checked the volts on every pin against the specks on the board and everything is where it needs to be even the vg, and vs voltage. This is when tv is up and running and when it is doing its on off cycle. I notice the top right transformer is buzzing a little.
The two wire plug that comes from the power supply has 58-61 volts on both sides of the wire "one blue one brown" when I use the chassis as a ground. The fuse that is close to the two wire connector has 64v the other two fuses have 120-130v