Samsung UE48H6400AW, sound but no image

[RobE]

Samsung UE48H6400AW LCD TV

Main Board: BN94-07309H
T-Con: BN95-01309A
Power Supply: BN44-00709A

A friend of mine has a Samsung UE48H6400AW TV that does not work anymore.
When the TV is plugged in the backlight is off and it shows no picture when doing the "flashlight test". The sound however does work.

When I connect my laptop to the TV via an HDMI cable the TV remains to show the same symptoms, and only sound can be heard.

Some power does go to all boards, because all boards have at least one LED that is lit, plus there is sound.

When disconnecting the Main board from the power supply, the backlight does go on and stays on till the power cable is unplugged again or the connection between the mainboard and Power supply is reestablished.

Does anyone here know what part of the TV could be broken?

[budm]

Re: Samsung UE48H6400AW, sound but no image

Can we at least get some pictures of the whole backside of the TV showing all the board so we can see what we are dealing with?

[RobE]

Re: Samsung UE48H6400AW, sound but no image

Can we at least get some pictures of the whole backside of the TV showing all the board so we can see what we are dealing with?

Thank you for replying.
I will get those pictures as soon as I am able to. This is my first experience on any forum ever, and did not expect a reply this quickly, currently its the middle of the night here.

I do happen to have one picture however, it is a picture of the T-Con module.

[budm]

Re: Samsung UE48H6400AW, sound but no image

So the power supply and backlights/backlights circuit are OK.
If you disconnect the cable from T-CON to the main board, do you get backlights to come on?

[RobE]

Re: Samsung UE48H6400AW, sound but no image

I took the pictures today.
The first image shows the whole backside of the TV. The following three pictures are the three individual boards. And the last picture answers your question:

So the power supply and backlights/backlights circuit are OK.
If you disconnect the cable from T-CON to the main board, do you get backlights to come on?

The answer is YES. The backlights do come on when the T-CON board is disconnected from the main board. Do you happen to know what this means?

[luislisalex]

Re: Samsung UE48H6400AW, sound but no image

Hi, I have exactly the same problem on the same television.
Is the t-com the one that fails or can it be the panel?
Thank you very much for your help.

P.S. I'm sorry for my English but I only speak Spanish and use a translator

[neilc6]

Re: Samsung UE48H6400AW, sound but no image

If the backlights come on with the main board disconnected on Samsung tvs, then the main board is suspect. You should check if the BL-ON signal is coming from the main board and also check the rest of the voltages on that connector.

[nomoresonys]

Re: Samsung UE48H6400AW, sound but no image

Maybe check tcon fuse, see if you have voltage on each side.