Samsung PN50B430P2DXZA

[ned1]

Re: Samsung PN50B430P2DXZA

Y-main scope reading

[ned1]

Re: Samsung PN50B430P2DXZA

Where do I connect scope probe on X-main

[ned1]

Re: Samsung PN50B430P2DXZA

Also is 5V standby power supposed to be there with tv on and tv in standby mode.

[tom66]

Re: Samsung PN50B430P2DXZA

Nice scope! Y'know, it has a USB port, for exporting an image, it's a lot easier.
Y-main looks OK.
X-main waveform, see picture.

Yes, 5V standby should always be present.

[ned1]

Re: Samsung PN50B430P2DXZA

Nice scope, operator sucks.
See the X-main scope picture.

[ned1]

Re: Samsung PN50B430P2DXZA

Here is the one that matters fromX-main

[tom66]

Re: Samsung PN50B430P2DXZA

That's more or less correct for X-main waveform. Can you try turning off the dual-timebase zoom (zoom factor should be off) and use a timebase of 10us/div?

[ned1]

Re: Samsung PN50B430P2DXZA

Here you go X-main

[ned1]

Re: Samsung PN50B430P2DXZA

Y-main with new settings looks suspicious

[tom66]

Re: Samsung PN50B430P2DXZA

I can't find fault with either of those waveforms.
Does Ve of 88V match the rating printed on the panel? What happens when you increase it? I have to say, 88V is quite low, a modern panel is closer to 130~150V, though it is one of the most variable voltages for a plasma.

[ned1]

Re: Samsung PN50B430P2DXZA

Did you see the picture of new Y-main waferorm I send. 88V matches panel sticker, maximum increase is close to 120V no difference in picture quality

[Glitcher]

Re: Samsung PN50B430P2DXZA

88V is the correct spec for this panel, its also the same spec for the PN50B450 model I worked on.
This is starting to look like the same problem I was going through, all the voltages are on the correct spec too.

[tom66]

Re: Samsung PN50B430P2DXZA

The Y-main reading looks OK. I'm at a loss to explain the poor image - everything is working right. Any change in image noticed when you adjust the Yrr or Yfr on the Y-main? You should also see a change in the Y-main waveform.

[ned1]

Re: Samsung PN50B430P2DXZA

No change

[tom66]

Re: Samsung PN50B430P2DXZA

Only suggestion I've got left is a bad control board.

[ned1]

Re: Samsung PN50B430P2DXZA

I thought same but the replacement I got have same problem. It still can be bad replacement from eBay

[tom66]

Re: Samsung PN50B430P2DXZA

I never thought of it before, but how sure are you the X-main is connected properly to the panel? Are all ribbons installed? Is the connector well seated, no cracked solder joints etc,?

[ned1]

Re: Samsung PN50B430P2DXZA

I will compare x- main I ordered and the replacement. Maybe the one I repaired damaged control board I ordered as replacement. What bugs me is there are 4 RJH3044 gets and 2 Fairchild fets and Fairchild fets are supposed to be replacement for RJH3044. I installed Fairchild so ended up with 6 same Fairchild parts. If they are replacement why would every x and y main had both of them? I guess something is different.

[ned1]

Re: Samsung PN50B430P2DXZA

X main is connected properly. I removed few times and reconnected. I don't see nothing wrong with cable or connection. There is a way to check main and logic board pattern in service mode also. I just need to get remote for Samsung

[ned1]

Re: Samsung PN50B430P2DXZA

.