ps-50q96HD Black Horizontal line

[comptek]

hi folks i have a ps-50q96HD it had a clicking power supply which is now resolved hence finding a solid Vertical (edited) black bar.
stripped down assembly to check ribbons to re-seat them and came across a burnt connector on the buffer (E)

on inspection there is still the track there on the ribbon just maybe needs a clean ? (see picture)

also on the board there a 2 resistors labeled 470 have bubbled ? its not lacquer

i have looked for a replacement buffer and can only find a
LJ41-04733A REV R1.1 <<<<< replacement
LJ41-04733A REV R1.0 <<<<< original
would the replacement work or am i wasting my time and the screen has failed any comments or suggestions are welcome
thank you
Gary[/URL][/IMG]

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[tw2005]

Re: ps-50q96HD Black Horizontal line

As long as that E buffer looks the same and has the same connectors I'd say it'll be fine. Not so optimistic of that ribbon though. Any evidence of moisture, looks very grotty. I think the issue there is since this has burnt, then ribbon looks burnt which may lead to tracking between those pads. Does look black. If any of those embedded ICs on ribbon are damaged then that's panel damage , non repairable.
Interesting that would cause a horizontal bar, I would have expected bad y-buffer and these do have a common PSU fault and upper buffers / ymain failures.

The AA2 is probably the REV to search for when looking

[comptek]

Re: ps-50q96HD Black Horizontal line

*****AMENDMENT***** its a vertical bar not horizontal apologies

[comptek]

Re: ps-50q96HD Black Horizontal line

Many thanks for the input its a "vertical" bar not horizontal sorry for misleading you
and it is very dusty there no sign of liquid though :/

As long as that E buffer looks the same and has the same connectors I'd say it'll be fine. Not so optimistic of that ribbon though. Any evidence of moisture, looks very grotty. I think the issue there is since this has burnt, then ribbon looks burnt which may lead to tracking between those pads. Does look black. If any of those embedded ICs on ribbon are damaged then that's panel damage , non repairable.
Interesting that would cause a horizontal bar, I would have expected bad y-buffer and these do have a common PSU fault and upper buffers / ymain failures.

The AA2 is probably the REV to search for when looking

[tw2005]

Re: ps-50q96HD Black Horizontal line

I'm going to say chances are slim then because it may very well be excess current draw due to the IC failure / shorted out IC potentially on that ribbon that caused the meltdown.
. If you found a buffer dirt cheap it may be worth a gamble. The ymain and upper/lower buffer set would have reasonable value to sell or good chance you may pickup a another with good panel cheap? same boards used in the 50Q91 or C91 if you had that model

you have not run this without that long alloy strip bolted across those lower address buffer boards, have you? instant death for those ICs. I did that once, destroyed a TV I just fixed the y section on.

[comptek]

Re: ps-50q96HD Black Horizontal line

Hi TW no i have not run it at all without the strip in place
i found the board with a different rev number for £15 or best offer on ebay so like you said its worth a gamble can i test the ribbon and note measurements with the others if you know what i mean ?
would that narrow things down?

I'm going to say chances are slim then because it may very well be excess current draw due to the IC failure / shorted out IC potentially on that ribbon that caused the meltdown.
. If you found a buffer dirt cheap it may be worth a gamble. The ymain and upper/lower buffer set would have reasonable value to sell or good chance you may pickup a another with good panel cheap? same boards used in the 50Q91 or C91 if you had that model

you have not run this without that long alloy strip bolted across those lower address buffer boards, have you? instant death for those ICs. I did that once, destroyed a TV I just fixed the y section on.

[tw2005]

Re: ps-50q96HD Black Horizontal line

Hi TW no i have not run it at all without the strip in place
i found the board with a different rev number for £15 or best offer on ebay so like you said its worth a gamble can i test the ribbon and note measurements with the others if you know what i mean ?
would that narrow things down?

I got no idea but I'm thinking more towards panel damage the more I think about it. maybe wait for other opinions first. Comparing other resistance readings may prove useful. If it turns out to be shorted there I would think game over

[comptek]

Re: ps-50q96HD Black Horizontal line

ok thanks TW i will try measuring and see if theres anymore helpful and handy pointers much appreciated tw

I got no idea but I'm thinking more towards panel damage the more I think about it. maybe wait for other opinions first. Comparing other resistance readings may prove useful. If it turns out to be shorted there I would think game over

[comptek]

Re: ps-50q96HD Black Horizontal line

just a quick update !
part finally cost £14 and i cleaned up burnt ribbon and tadah!
many thanks for advice and possible bad news about the screen it was worth a gamble
50" Samsung plasma up and running for 5 hours now no problems

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[ReeceyBurger123]

Re: ps-50q96HD Black Horizontal line

Wow well done mate I would have wrote that off as panel ! Very well done hope you make a great profit

[tom66]

Re: ps-50q96HD Black Horizontal line

Nice - would have thought panel too having seen too many Samsungs go the same way.
You probably got lucky and it was just moisture damage.

[comptek]

Re: ps-50q96HD Black Horizontal line

Wow well done mate I would have wrote that off as panel ! Very well done hope you make a great profit

thanks mate

[comptek]

Re: ps-50q96HD Black Horizontal line

Nice - would have thought panel too having seen too many Samsungs go the same way.
You probably got lucky and it was just moisture damage.

thanks tom

[ReeceyBurger123]

Re: ps-50q96HD Black Horizontal line

Honestly well done for not giving up I have seen it as welk on a few of these q96's

[comptek]

Re: ps-50q96HD Black Horizontal line

i too started to think the worse but hey
thanks again all

[tw2005]

Re: ps-50q96HD Black Horizontal line

yeah, I would have thought no way the panel would be ok. Very surprised. If this thing shuts down randomly these get cracked joints on the PSU around the heatsinked FETs especially Va and Vs ccts.

[ReeceyBurger123]

Re: ps-50q96HD Black Horizontal line

He has repaired the psu I think I told him what to do. Another very common fault is the shitty Y main failing then killing the buffer.