Samsung Plasma PN50C550G1F : no image, but sound is ok

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Sometimes loose screws can cause the boards to fail.

Check your new buffer board for shorts. Shorts in same area or different area?

Thanks for the advice...
Not sure if I will continue this route.
<
I might simpluy go get a new sceen with warranty.
Time is missing with 3 kids.

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Sometimes loose screws can cause the boards to fail.

Check your new buffer board for shorts. Shorts in same area or different area?

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Did you fully secure all screws for the Y-main & Y-buffer board?

Yes, all the screws were put back in place and properly thighten. Why do you ask?

As for a scope, what's your budget? $50-60 can pick up a decent analog scope. $400 buys a new Rigol DS1054Z, one of the best value-for-money scopes currently available.

Thanks for the scop hint...

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Did you fully secure all screws for the Y-main & Y-buffer board?

As for a scope, what's your budget? $50-60 can pick up a decent analog scope. $400 buys a new Rigol DS1054Z, one of the best value-for-money scopes currently available.

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Well pleasure didn't last ...

Tonight, for the first time since the TV is repaired, my boy plays is new game he received for christmas ... After about an hour of ply ... PAF...
No image again.

Same problem as last time.

Any idea what could cause this kind of recurrent problem?

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

The top connector seems loose, so IO tried my old Ybuffer, but back to blank screen.

Then I reinstalled the new Ybuffer and again had trouble to secure the top connector ... but then "click!!!"

Turned On the TV ... et voila!

Back to life!!!

Yeah, 40CAD$ isn't too bad to fix that not so old plasma!

Thanks for your help everyone!

BTW Tom66, would you have a recommendation for a good, but cheap$$ scope?
This is a piece of equipment I'm missing and that could be usefull from time to time.

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

I have replace the connectors.
The bottom section is now fine.
The top still have some lines.
When I play with it they "disapear" (lines are displayed properly).
The top connector is a bit loose and I can't get a good connection now.
Any ways to secure it?

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Well, I have installed the new Y-main (Y-sustain) and the new Y-buffer, and the screen is alive, but now I have some horizontal lines on the top portion of the screen (about 1/6 of the height).

Is that kind of problem typically related to one of the 6 connector of the Y buffer, or to the X-buffer?

If I install my old Y-sustain, do I risk damaging the "new" Y buffer?

Any recommendation?

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

superbigjay, if the new boards you order from ebay do not work out for you let me know
i have the same exact tv and i was never able to repair it
the only board i didn't replace on mine was the main board

Will do... I just picked up my boards for 40$CAD. (roughly 32USD).

Will replace them tonight and post any success / failure.

I'll check your thread too when I got some spare time.

Jay

[jose6326]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

superbigjay, if the new boards you order from ebay do not work out for you let me know

i have the same exact tv and i was never able to repair it

the only board i didn't replace on mine was the main board

https://www.badcaps.net/forum/showthread.php?t=28943


thanks

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Test the new Y-buffer too. I'd swap both Y-buffer and Y-sustain at the same time just in case.

Yep, this is what I had in mind...
Thanks Tom66 for all your advice!
It is appreciated.

Even if it doesn't work, at least I will have learned a few stuff on plasmas

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Test the new Y-buffer too. I'd swap both Y-buffer and Y-sustain at the same time just in case.

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

I can confirm that there no visible cracks on the screen...
The shorts were found on almost all connectors and at various locations.
Some had many shorts and other only a few.
I tried the 3rd and 4th pin from the left as shown in the video, but almost all pin had at least a short somewhere.

I'll give it a try with the y-buf/y-sustain replacement boards I talk about previously. They are sold by a small repair shop not too far from my place and are supposed to be garanteed to work (tested).

Probably worth the shot to try.

Thanks a lot for your support.

Jay

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

As long as there are no cracks (it can be a really tiny one, like just a few pixels, or on the very edge of the panel) you should be able to fix this TV by replacing the Y-buffer. Where were the shorts found, in various positions or just around a few connectors?

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

The screen/glass seems flawless : no sign of crack/hailine/dent anywhere

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

I removed the y-buffer and tested for shorts like shown in the video...
There're many detected by my multimeter, so I guess this isn't a good sign.

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Ok, it would be a good idea to check the Y- buffer board.
https://www.youtube.com/watch?v=51SZsfH60EY

Also, there are no cracks on the screen at all, right? Including really small ones. Any one can stop it working.

Ok, I will check the video and test the y buffer.

Screen look pristine ... So I doubt this would be the cause.
It would be visible from the front of the tv right?
Like if the glass would be broken?

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

Ok, it would be a good idea to check the Y- buffer board.
https://www.youtube.com/watch?v=51SZsfH60EY

Also, there are no cracks on the screen at all, right? Including really small ones. Any one can stop it working.

[superbigjay]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

No, unfortunatly, I only have a good old multimeter ...

[tom66]

Re: Samsung Plasma PN50C550G1F : no image, but sound is ok

No, no need right now to check X-main.

Do you have an oscilloscope spare?