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.

But what we just tested is the main logic control the tcon correct? And I don't even think it connects to the main after u disconnect the lvds cable so how did we check the main? Or it woulda turned on if the main was bad huh?

[mattstolte]

Re: help with samsung pn58b550 plasma

also what place do u want me to check it at? I checked all voltages on them and there correct? So I don't know what to do now. Could the main logic control be bad? By unplugging all the buffers and scan drive y sus,zsus shouldn't I have gotten a picture somewhere?

[mattstolte]

Re: help with samsung pn58b550 plasma

But what we just tested is the main logic control the tcon correct? And I don't even think it connects to the main after u disconnect the lvds cable so how did we check the main? Or it woulda turned on if the main was bad huh?

So tom what should I do next? I'm lost now

[tom66]

Re: help with samsung pn58b550 plasma

If the main board (with HDMI etc on it) was bad you would have got some test patterns on the screen with that 3-4 jumper.

Yes you could have a bad logic board (or "main logic" if you like) but as you have a flashing light (meaning its processor is running and trying to control the plasma panel), it's unlikely, so for now, I'm suggesting checking elsewhere and that is why I want you to find Vscan or Vsc test point and check it. It will be on there somewhere!

If Vscan/Vsc is missing it points towards a bad Y-buffer or Y-main board.

Don't shot-gun replace stuff UNTIL you've found the problem, or you'll be hundreds of dollars in and it still won't work.

[mattstolte]

Re: help with samsung pn58b550 plasma

If the main board (with HDMI etc on it) was bad you would have got some test patterns on the screen with that 3-4 jumper.

Yes you could have a bad logic board (or "main logic" if you like) but as you have a flashing light (meaning its processor is running and trying to control the plasma panel), it's unlikely, so for now, I'm suggesting checking elsewhere and that is why I want you to find Vscan or Vsc test point and check it. It will be on there somewhere!

If Vscan/Vsc is missing it points towards a bad Y-buffer or Y-main board.

Don't shot-gun replace stuff UNTIL you've found the problem, or you'll be hundreds of dollars in and it still won't work.

Tom I'm sorry I'm dragging this out but I have no idea where these test points are??? All them pictures I added on page 1 is not it? I don't even know what it looks like if u could show me an example picture maybe? Thanks for all ur help

[mattstolte]

Re: help with samsung pn58b550 plasma

Tom im at my shop now can u tell me what to look for on this plasma?

[tom66]

Re: help with samsung pn58b550 plasma

not sure, I just recalled this thread and we couldn't find it either, see this image for some quick checks
https://www.badcaps.net/forum/attach...1&d=1390928806

[mattstolte]

Re: help with samsung pn58b550 plasma











tom is this anything you wanted to see?

[tom66]

Re: help with samsung pn58b550 plasma

I have a feeling Vscan might be indicated by that arrow... but that could also be the DIP flow direction, so.... not sure. Nice of Samsung to make it so very clear as mud.

[mattstolte]

Re: help with samsung pn58b550 plasma

so in that picture am I putting my probes on each side of that coil?

[mattstolte]

Re: help with samsung pn58b550 plasma

and on the connector am I putting my negative probe on lead 3 and positive on lead 11?

[tom66]

Re: help with samsung pn58b550 plasma

the red capacitor, not the coil.
red lead on red, black lead on black.

[mattstolte]

Re: help with samsung pn58b550 plasma

the red capacitor, not the coil.
red lead on red, black lead on black.

what about in the picture of the connector?

[tom66]

Re: help with samsung pn58b550 plasma

As you said. Do that.

[mattstolte]

Re: help with samsung pn58b550 plasma

As you said. Do that.

on the cap im getting -110 on my meter??? on the connector im getting nothing.. and while I was testing it I smelled something really hot on that board burning

[mattstolte]

Re: help with samsung pn58b550 plasma

also how can I discharge that board with out getting shocked? or am I ok? im gonna take it off and look at the bottom

[mattstolte]

Re: help with samsung pn58b550 plasma

tom you think I should get new y main?

[tom66]

Re: help with samsung pn58b550 plasma

I haven't made my mind up yet because I don't have all the requested information...
Negative reading for the caps is fine, depends on which way you put the probes & which way I've indicated it... 110V does indicate that part of Y-main is fully functional. If you listen carefully you might be able to hear a slight buzz from the board. This is OK.

[mattstolte]

Re: help with samsung pn58b550 plasma

I haven't made my mind up yet because I don't have all the requested information...
Negative reading for the caps is fine, depends on which way you put the probes & which way I've indicated it... 110V does indicate that part of Y-main is fully functional. If you listen carefully you might be able to hear a slight buzz from the board. This is OK.

I hear slight buzz from y and z sus's. what other info do you need? remember I am new to this so all this is new to me, thanks

[tom66]

Re: help with samsung pn58b550 plasma

The Vsch I highlighted across those pins for one...