Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

[Michale32086]

Want to confirm that it's a panel issue..

Things I have checked...

The buffer board connection cleaned and reseated.... The tab bonds off the X-SUS cleaned and reseated.. The connector off the Control board and the LVDS connector between Main Video & Control board cleaned and reseated..

Missing any other possibility???

[dick_barton]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Have you checked the last buffer chip for any problems. It does look like either those lines are not being driven or you may still have a ribbon connection problem. Just a thought.

[Michale32086]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Have you checked the last buffer chip for any problems. It does look like either those lines are not being driven or you may still have a ribbon connection problem. Just a thought.

Thanx for the reply...

Attached is a pic of the last 2 buffer chips.. They look OK, but I don't have the expertise (and likely, the equipment) to check them beyond the visual..

As far as the ribbon connection, do you mean the LVDS cable??

Thanx again...

[R_J]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Like dick said, check the buffer ic's, I doubt its a bad connection since the ribbon plugs into a socket on the buffer board. Also in your last picture, having that ribbon on the Z-sus side unpluged will have no real effect, all those ribbons on that side of the panel are connected together.
All that is required to check the buffer ic is a meter with diode test

[dick_barton]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Hopefully the youtube video will help and its the bottom socket your interested in checking.

[Michale32086]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Youtube video helped a lot.. I get no continuity when, as I understand it is a good thing.. I didn't do the diode test because I think I found the issue..

Although it's hard to make out from the pics, it looks like the metal contacts have worn down and are obscured by the plastic housing...

When the TV is powered up, I can't make all the lines disappear, but I can get it down to 1 thin line or a bunch more lines, by rocking the connector slightly to/fro...

Dunno if I have the dexterity to clean/scrape the plastic residue from the contacts.. Barring that, it's likely a buffer board replacement will fix the problem..

[Michale32086]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

Final dispo on this..

Ordered a replacement buffer board.. Still have the same 3 lines..

I guess the bear got me this time...

Thanx to all for the input..

[budwich]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

did you check the "other end" (ie. the connector that plugs into those connectors on the board. It is likely that those connectors have an issue.

[Michale32086]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

did you check the "other end" (ie. the connector that plugs into those connectors on the board. It is likely that those connectors have an issue.

Yea, and I even crimped them a bit to make sure they were making good contact..

I can only assume that the issue is where the tab bonds (for lack of better term) mold into the panel...

[Davi.p]

Re: Sammy PN50B650. Excellent display cept for 3 thin horizontal lines

There's a rich literature about that around 2010 Samsung plasmas that often has a problem like yours, the lines are not fixable, there's an electrical problem in the buffer board driving, sometimes is broken the buffer sometimes also the y-sus but i suspect the fault comes from a high ripple psu, so if you want to save some money selling the tv with the lines, you can maybe stop the appearing of further lines by checking the el.co., if it worth the pain..