Samsung forum


Both HDMI ports dead, Anything I can do? LCD LE40F71b

by maraxion / January 18, 2013 9:15 AM PST

So My old LCD has a problem with the HDMI ports.
All other ports seem to work.

Iv checked the sending device and changed resolution. It also works good on another samsung tv.
Iv booted to reset mode(Info-Menu-mute-power) and disabled and enabled HDMI ports, no go.

In the main meny the HDMI ports are grayed out. Also forced tv to HDMI 1 and HDMI 2, but no go.

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All Answers

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Try the old remove power test.
by R. Proffitt Forum moderator / January 18, 2013 10:36 AM PST

Unplug all cables, power and let it sit for hours then try again. Any component inputs?

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Component ok
by maraxion / January 18, 2013 7:48 PM PST

I ave component input yes, and those seem to work. Sometimes when I start up the tv the letters and stuff might be a bit blurry.
Also I managed to get HDMI signal to it, but its not good. It found this video and it looks like the same problem:

Does anyone know if this is the input card, power card or what I might be able to change?

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Sorry no.
by R. Proffitt Forum moderator / January 19, 2013 2:44 AM PST
In reply to: Component ok

I can not diagnose over a forum and must only guess. For this one I suspect the board that has the HDMI ports on it and then if that board connects to another board, that board. At most this has meant 2 boards to change.

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by maraxion / January 19, 2013 8:51 PM PST
In reply to: Sorry no.

I see.
I was guessing it was the output board since its only the HDMI that seems dead. All other like component and composite are working.
The other board the main board is offcource connected, but seems strange if that should be bad also?

Also, iv been looking around and found boxes that alter signals from hdmi to component. But they seem to be "expensive" about 50$ which is actualy the same as buying the board(but thats not a sure fix).

But I found these:
They cost about 5$. But I was wondering wil these cables work, because Im not that into the digital/analog signal and how the end result might be.

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AVOID that cable.
by R. Proffitt Forum moderator / January 20, 2013 12:48 AM PST
In reply to: Hm

The reason that cable is made is because folk want it (for a few dollars.) In the USA a working HDMI to component may be illegal (I will not enter into a discussion why.) I can discuss why a cable alone is not supposed to work.

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by maraxion / January 20, 2013 1:10 AM PST
In reply to: AVOID that cable.

yea iv understood the cable alone wil not work.
Ao my options is either getting a full converter(dont line in the us) or fix the tv.
I realy just wish I knew what card is broken.
Te TV have 3 main card:
Power card
A/V card
LCD controller card.

So when I set in the HDMI it seems like its trying to get the picture right, but as the video shows it shuts of an on. Mutch like when you power a new HDMI device normaly.
Iv been using the component a few hours to test it, but just as I write this it seems to fail aswel. It starts shutting of and on and show blurry vertial green and purlpe lines... Worked great so far, but not now...

So any guess what card should be the problem? I have understood that the A/V video(input)card seems to have had problems on this model.

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Thought I guessed.
by R. Proffitt Forum moderator / January 20, 2013 1:23 AM PST
In reply to: ok

I start with the board with the HDMI ports. In old designs this was just an I/O board with ESD protection and we changed that for many reasons (not listing them here.) If that didn't cure it, we moved to the next board downstream.

This is often repeated in the service manuals. As a TV Repair Tech you should be seeing that manual and the usual flow charts that cover this.

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by maraxion / January 20, 2013 1:29 AM PST
In reply to: Thought I guessed.
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Good choice.
by R. Proffitt Forum moderator / January 20, 2013 3:39 AM PST
In reply to: ok

I see the usual HDMI decoder chips there so if it's the usual ESD or other HDMI damage then this is the most likely board.

Good luck,

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by maraxion / January 20, 2013 6:05 AM PST
In reply to: Good choice.

But since I obviously also have some problems with the other inputs. Can i be the downstream card, the LCD controller card?
I just find that strange because yes it would explain the visual issues, but not that the tv shuts of and on like the hdmi is been plugged. That should be the output cards job to send to the power card I would asume.

Il try to find this BN41-00762B somewhere online. I see most stores have it sold out, but Il look and hope.

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Why would you think that?
by R. Proffitt Forum moderator / January 20, 2013 7:07 AM PST
In reply to: but?

That board looks to have it all. Sorry but here is where you let a shop fix it. They'll assume all the risk of getting the wrong board.

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