Bad picture samsung UE46D5005

[lime3003]

Hey everyone, I like to fix things or try at least.
My latest buy was a Samsung lcd tv with a broken screen.
So I opened it up and suspect that it could the capacitors but none was bulging uppwards.
Any ideas on where I should start measure or what I should start with.

Appreciate all the help I could get.


Picture of the screen:



Back of the tv:

[mmartell]

Re: Bad picture samsung UE46D5005

Umm what's wrong with the screen or the picture again ?

[lime3003]

Re: Bad picture samsung UE46D5005

Umm what's wrong with the screen or the picture again ?

If you look closer to the tv picture it allmost looks like horizontal lines in it and it distort the picture.
Doesn't have that clear picture that it should have.

[Alastair E]

Re: Bad picture samsung UE46D5005

Yes--I see the pic fault--Its like a displaced vertical image, a 'ghosting' effect,--strangely on this one--the whole picture.

Seen it many times, where only half or less is displaced, It was the T-Con in those cases messing round.
Also had the ribbon-cables mess around causing similar effects--Worth re-seating and carefully cleaning them anyway....
In one case I had, It was the actual display-panel itself, not sure what caused that fault on the panel though, I scrapped it....

(Horrible to think--That set was prob best part of £700--and there's 'Nothing' inside it!)

[Ltank]

Re: Bad picture samsung UE46D5005

Less to go wrong. Look inside a early or a 4 year old 60" LG Plasma TV.
They are boards that take up almost every square inch inside. With Plenty
to Go Wrong!

[tom66]

Re: Bad picture samsung UE46D5005

I would disagree. Now all the major electronics are on the panel. When they go wrong, the panel and TV is scrap. In those older TVs you could narrow it down to a board, usually, by tracing signals and voltages, and parts could be replaced individually, at lower costs.

[lime3003]

Re: Bad picture samsung UE46D5005

Yes--I see the pic fault--Its like a displaced vertical image, a 'ghosting' effect,--strangely on this one--the whole picture.

Seen it many times, where only half or less is displaced, It was the T-Con in those cases messing round.
Also had the ribbon-cables mess around causing similar effects--Worth re-seating and carefully cleaning them anyway....
In one case I had, It was the actual display-panel itself, not sure what caused that fault on the panel though, I scrapped it....

(Horrible to think--That set was prob best part of £700--and there's 'Nothing' inside it!)

Okej, so if it could be the T-Con board how can I decide if it´s?

[Alastair E]

Re: Bad picture samsung UE46D5005

Easiest (all-be-it not the cheapest) is by substitution with a known good T-con

[lime3003]

Re: Bad picture samsung UE46D5005

Easiest (all-be-it not the cheapest) is by substitution with a known good T-con

So i cant measure it somehow to decide if it's broken, before I buy a new t-con board?
It couldn't be caps with bad esr or current regulatorer that is leaking?

[SuperDaff]

Re: Bad picture samsung UE46D5005

I've had success changing the ribbons on a 32'' Samsung with the same problem

[lime3003]

Re: Bad picture samsung UE46D5005

Could it be the caps on it? I have measured the ESR on all on them.
Can someone link to a good page that says what is good value on them.
The measures is:
All of them is of the brand Sam young

50 V 10 μF = 46 mΩ
50 V 10 μF = 40 mΩ
50 V 47 μF = 50 mΩ
50 V 22 μF = 120 mΩ
450 V 82 μF = 470 mΩ
50 V 22 μF = 160 mΩ
50 V 47 μF = 75 mΩ

And there some of them that I can't say what voltage and Farad
but there is one that has 2 Ω in ESR could this be broken or could it have that high ESR and still work?

Also could this problem occur if a current regulator is broken?

Gratefull for all the help I could get.

Will try to clean the ribbons today aswell!

[mmartell]

Re: Bad picture samsung UE46D5005

A small cap could have 2ohm esr and still be in spec. You can look up a generic esr table for ballpark figures or check the spec sheet for a particular manufacturer. They should always be tested out of circuit unless you are sure the circuit they are in are not affecting readings.

[lime3003]

Re: Bad picture samsung UE46D5005

Is there someone who is having a service book on this modell?
Also is samsung using same ribbons on diffrent model tv and also is there any diffrent in T-con boards? Because I have one working samsung UE40D6535WSxxE that I was thinking about changing the T-con board to see if that is the problem.

[wreksta]

Re: Bad picture samsung UE46D5005

Try taking panel out of the frame there is small screws all the round the edge of the panel loosen these to see if picture improves

[lime3003]

Re: Bad picture samsung UE46D5005

Try taking panel out of the frame there is small screws all the round the edge of the panel loosen these to see if picture improves

Why would it improve the picture?
Been in contact with a shop that was selling the T-con board and they say that after watching this picture they think it´s the panel and not the T-con board what is your opinion?
If you look on the lower part of the picture, there is a slice of the picture that is good, is that meaning it´s the panel?

[tom66]

Re: Bad picture samsung UE46D5005

Yes in general if part of the picture is OK then it is almost always "panel" I'm afraid!
D-series Samsung LED/LCD are TERRIBLE for panel reliability. 4th D-series this week maybe? Not sure, but they keep on dying.