Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

[Andrew F. Ali]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

That is bad panel, more likely the TFT driver ICs (they run hot) that when they get hot and cause the problem you see on the screen.

+1...That it right there...

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

+1...That it right there...

Ok thanks. I know how to get to the top boards, I will have a look on YouTube at repair videos because there is a guy "norcal" and believe and I think I have seen him talk about replacing one of them.

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

https://youtu.be/purk_SyiT44

Hmmm guess not repearable
I'm wondering if it could be the small section of ribbon from The t-con to the top circuit board.
I will try switching the left and right cables to see if the problem follows the cables

[budm]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

TFT driver ICs.

[Diah]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

no .. also cool spray will be yours oscilloscope.

suggest you to use cool spray not to replace caps, then you can use it not only on power supply even the main board and panel Tab. !!

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

Yep, although i might spend some time online today looking if i can find the small ribbon cables that go from the IC driver boards to the t-con... because even if i lift the black tab on the t-con on the left ribbon, that side goes white and the other side picture returns...
so i think its got somthing to do with the connection between that cable and the tcon.
and because i had tried 2x t-cons in that TV, im my mind, its unlikely to be a faulty t-con connector... more the ribbon / pressure. but i agree, if i spray that cable with freeze spray while its faulting, and if it returns to working, i will be sure of that.

Is it safe to spray while the tv is operational? because like i said earlier, if i turn the tv off and back on again, its generally working for a few minutes....

Is the spray actually liquid? or just very cold air ?

[Diah]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

first ribbon cable can be inspected with magnifier to check the end cold pins not broken or they go to side. also no need to spend time searching if they are fine.

cool spray are air spray can be applied when the TV switched on. no worries .. just little on part it will frozen it to go back as its first start.

[ReeceyBurger123]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

He wont listen OP to me sounds like tab bond fault. Listen to Budm to fix your tv.

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

I am listening but I'm also trying the freeze spray because I don't want the result to be the driver IC that can't be fixed

[Diah]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

He wont listen OP to me sounds like tab bond fault. Listen to Budm to fix your tv.

Budm have rich Knowledge and experiences i do respect it allot. but what we will do with whom had always changing at at judgements

Mainboard fault, what board does it use ?

but you were right he didn't listen to all suggestion... cheers

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

Budm have rich Knowledge and experiences i do respect it allot. but what we will do with whom had always changing at at judgements
but you were right he didn't listen to all suggestion... cheers

Wait? whos's not listening to who?
At this point, i am thinking the issue is now down to
- LCD Panel bonds (the TFT driver chip)
or
- The flex cable that joins between the TFT Driver circuit board and the T-con board.

Last night, i got home turned tv on.... and of course when i want it to be faulty, it behaves itself.

I am wanting it to become faulty, then use the freeze spray just on the ribbon where it connects to the tcon to see the results.

[hifimig]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

I have the same model TV which gets random Horizontal and vertical lines making up a blurry image after a few minutes on Digital TV and HDMI (sound is fine all the time). All voltages measure fine 13V is a around 13.7 on pin 21 of Power supply board.

if power cord or LVDS cable to TCON board was quickly pulled out and put back in within 2-3 seconds i get perfect picture few more minutes. Can that still be the panel ?

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

I sold the tV because i could not get it working with everything i tried.
The panel from what everyone tells me is the most expensive part and that is where it makes it not worth repairing.
But i believe you could part the boards out and still make some money off it if its confirmed that its a panel fault.

[hifimig]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

TFT driver ICs.

budm good suggestions and thanks for your contribution. I think I isolated it down to the panel. When I had the panel running facing up without the metal frame it works perfectly. So the electronics are fine. The panel tabs are fine too because they don't interfere when touched/cooled. It seems I have a fault in the LCD itself.

[Geniee33]

Re: Samsung LA46S81BDX/XSA - Lines after 5 mins, restart... fine for another 5 mins

have you tried other ribbon cables from another set, I know its a long shot, but pretty easy to try and rule out.