help with samsung pn58b550 plasma

[mattstolte]

Re: help with samsung pn58b550 plasma

That marks the adjustment point, but we're still looking for a place to test it. Since 3-4 jumper did not work, it is unlikely to be a main board fault.

Think I should just go with gettn a new y main?

[tom66]

Re: help with samsung pn58b550 plasma

It's your money, could still be bad control board or bad buffer.

[mattstolte]

Re: help with samsung pn58b550 plasma

It's your money, could still be bad control board or bad buffer.

well im stuck here, and I don't know what to do, if it was a bad buffer wouldn't I have gotten some sort of picture as I was disconnecting buffers and scan drives?

[tom66]

Re: help with samsung pn58b550 plasma

Not always. Depends on the TV. I have some which do and some which don't. Hence why I wanted you to get all those readings I asked for. The readings so far indicate a good part of the Y-main board is working.

[mattstolte]

Re: help with samsung pn58b550 plasma

Not always. Depends on the TV. I have some which do and some which don't. Hence why I wanted you to get all those readings I asked for. The readings so far indicate a good part of the Y-main board is working.

Ok what other readings do u want?

[tom66]

Re: help with samsung pn58b550 plasma

They are in the photo I linked previously, between those pins on the buffer board, and at the tab of that SMD transistor....

[mattstolte]

Re: help with samsung pn58b550 plasma

They are in the photo I linked previously, between those pins on the buffer board, and at the tab of that SMD transistor....

sorry tom I didn't even see that smd transistor in the picture yesterday, and whats crazy is that area where that is I took a picture of just now cause that's where I smelled something hot burning yesterday, how do I test that thing? what mode etc?

[tom66]

Re: help with samsung pn58b550 plasma

Red probe on point indicated, black on chassis, DC volts, board installed & TV running.

[mattstolte]

Re: help with samsung pn58b550 plasma

Red probe on point indicated, black on chassis, DC volts, board installed & TV running.

tom the voltages bounce from high to low, goes to 14, to 60, 10, 50, 100, 14, constantly just bouncing, and while I was down there, something is real hot burning smell, seems like it comes from that blackish resistor but this smd

[tom66]

Re: help with samsung pn58b550 plasma

OK, now pull the buffers out. Does the voltage stabilise?
Seems like bad buffer might be pulling down Vscan voltage.

[mattstolte]

Re: help with samsung pn58b550 plasma

I disconnected buffers and scan drive below it, and it still does that, this resistor is so hot my probe touched it and it started to melt and this was about 2 secs after I turned tv on

[mattstolte]

Re: help with samsung pn58b550 plasma

im not trying to be on a component repair for the board, I just wanna replace the board, im just trying to narrow the bad board down

[tom66]

Re: help with samsung pn58b550 plasma

Could you highlight this resistor for me on an image of the board... need to see if it might be damaged by a bad buffer board hence causing your fault.

[mattstolte]

Re: help with samsung pn58b550 plasma

Could you highlight this resistor for me on an image of the board... need to see if it might be damaged by a bad buffer board hence causing your fault.

its that blackish grey one

[tom66]

Re: help with samsung pn58b550 plasma

OK those do feed the buffers. Since you indicate you want a board swap I'd advise swapping both boards.

[mattstolte]

Re: help with samsung pn58b550 plasma

OK those do feed the buffers. Since you indicate you want a board swap I'd advise swapping both boards.

well tom as I said the y sus still does this without the buffers and scan drives

[mattstolte]

Re: help with samsung pn58b550 plasma

well tom as I said the y sus still does this without the buffers and scan drives

are u saying change the y sus and y buffers?

[tom66]

Re: help with samsung pn58b550 plasma

Yes, both. Buffer failure might have damaged Y-main.