42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

[rich-t]

the problem,,,if I turn off the tv using the remote it will not come back on, screen stays black, blue power light is on and a couple of quick white flashes on the screen almost too fast to be noted. what I have to do to get it working again is to unplug it from wall, wait for about 5 min. then plug it back in and try turning it on with the remote. Sometines I have to do this 5 or 6 times to get it to come back on. when I plug it in I hear the 2 relays on the board click but if I don't hear another click followed by a quick whoop as the HV building up I know I'll have to try again.I ended up leaving it on 24-7 but the electricity cost was too much. So I bought a used 50" LG plasma, works great but I still want to see if I can get this oldie working.
Sorry for the long tale of woe, longest e-mail I've ever sent. Hope you can help me out.
PS. I forgot to mention that when I plug the tv back in the red power light comes on (standby) then I hit the remote power button and the relays click and the blue light comes on and the remote does nothing to the tv (e.g.turn it off) nor will the power button on the tv. Don't know if this helps.

[jondoe]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Get the back off it, take some good pictures of the front and back of the boards for group inspection.

Here is a thread relating to this model > https://www.badcaps.net/forum/showthread.php?t=38739

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Thread rated 1 start for poor diagnoses and no informaton to help us help you. We need voltages of all boards and pictures.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Sorry, new to the forum so I didn't know how far I'd have to get into it (I'm a retired Auto Tech ) and only know enough to be dangerous, but I have a good fluke meter and a willingness to learn. First I have to get gas for the snow blower and clean 2 double wide driveways so it may be awhile before I get to it.
Thanks for the replys.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Here are some pic's of the boards,I've removed the cover from the left X? board and the I/O board, I think the logic/control is the 1 that's underneath it.







I'm going to try to get the voltages listed on the sticker.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Here are the voltages as read from the ps board and sticker values.
Va-54, actual=54,Vs-207,actual=206,Vso-190,actual=191, Ve-95, actual=15 x
It looks like Ve is the problem but I don't know how to fix it..

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Ok seems there is a problem on the Xmain as Ve only 15v. Have you tested the pcb for short circuits L

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Ok seems there is a problem on the Xmain as Ve only 15v. Have you tested the pcb for short circuits L

Don't know which pcb to test or how to test it for shorts. Help??

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

OOPS! My bad, read Vg as Ve as it was upside down, rechecked and readings are correct. Now should I be looking for bad solder joints? cracks?, all caps look good, but??

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Lol vg is 15v so Ve is good at 94v or so ? If so as Vs is good as well does the screen light up grey in a dark room ?

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Yes Ve is 94V. Haven't noticed any change in screen color.
What I find strange is that it would come on sometimes after being unpluged for 5-10 min but not if unpluged for a long time. Haven't had it come on now but haven't tried very hard.

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Well seems like your mainboard is the fault, have you ran the Samsung test patterns ?

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Well seems like your mainboard is the fault, have you ran the Samsung test patterns ?

No, I saw on the net it being done on a different tv but don't know how to do it to this one. I guess I would need a step by step instruction as much as I hate being spoon fed, my 76 year old brain ain't as sharp as it was.

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Ahh dont worry, also remove the mainboard tray out of the Tv and there should be a board under that if so can you get us a picture of it please ?

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Ahh dont worry, also remove the mainboard tray out of the Tv and there should be a board under that if so can you get us a picture of it please ?

this is logic/control board ??
It's got a green flashing light, about 1 per sec.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Bump.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

hello Reeceyburger123, I think this is the board where I jump a couple of terminals to get the test patterns, can you tell me how it goes?? Thanks.

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Jump the pins that say Pal 1-2 and or 4-5 apply power to the Tv. Not got time to reply quick atm sorry.

[rich-t]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Jump the pins that say Pal 1-2 and or 4-5 apply power to the Tv. Not got time to reply quick atm sorry.

Hey I'm surprised but happy you have time at all on christmas eve. I'll try this and get to later. Go and enjoy . Merry Christmas.

[ReeceyBurger123]

Re: 42"Fluid plasma tv Mod#(Samsung)pn50b550t2f

Ok cheers have a good one as well