Samsung UE55H6200 Sound but no video display

[Nix125]

Good morning all hope someone can help,

One evening a week ago Our samsung TV screen suddenly went blank but audio was still working. Left for a while then turn off/on power to see it this resolved the issue but issue still persists. Input is not the issue as menu screen is not visible either. Did the flashlight test which failed also. Audio still works but no led back light or video display.

Please see attachment for picture of the tcon, power board and main board. Before I start randomly changing boards, ect. When powering up the front red LED flashes around 7 times. Can anyone advise on how and what to test next?

Kind regards

[nomoresonys]

With tv unplugged, unhook cable from powerboard to mainboard, plug tv back into power, see if backlights come on.

[Nix125]

Thanks for the response nomoresonys as soon as I get home I willteat

Thank you

[Nix125]

Ok so when I disconnect the power board from the main board I can see the LEDs light up from the holes behind. Coincidentally it seems that if I keep the power connect to the main board and disconnect the tcon board the LEDs do light up. What can you make from this?

Kind regards

[neilc6]

Disconnect ribbon cables (unplugged) one at a time and see if you get a picture.

https://www.badcaps.net/forum/showthread.php?t=50646

[Nix125]

Hi neilc6, I've tried disconnecting the ribbon cables one at a time and have the same issue. It seems that as soon as the t con board is connected the leds go out even with no ribbons connected to the LCDs. There are no lights built onto the tcon board. Could it be a faulty tcon board?

[nomoresonys]

It is looking like a faulty tcon, I would try one if they're not to expensive, tcon can be tested, how to test can be confusing tho if not clearly marked.

[Nix125]

Thanks for the reply do you have any guidence on how to test?

[nomoresonys]

To be honest I have trouble knowing what the voltages should be, haven't had to deal with them very often, well lets see which one you have, what are the first 10 letter/numbers on your white sticker? Should start with bn-96xxx.

[Nix125]

Thanks for looking nomoresonys. Take a look at my attachment you should be able to zoom up as its decent resolution?

[nomoresonys]

See the labels vgb 14, vgb13 etc, and the little round copper looking pads, there's like 28 or so, those are test points but I don't know what voltage they should be.

[nomoresonys]

One there that seems to be a match: https://www.ebay.co.uk/itm/5555T10C0...UAAOSw2QtdJ2za

[nomoresonys]

Just in case it can't be fixed, list there, the first one has a bit different numbers think I would skip that one, but from 2 down a ways look like a match, they seem to have a bunch of them, they also have a make offer option: https://www.ebay.co.uk/sch/i.html?_f...vn05.7&_sop=15

[budm]

https://www.badcaps.net/forum/attach...2&d=1566036467
Check: with and without ribbon cables between the LCD panel connected. Do not disconnect and re-connect any cables when TV is plugged into the outlet.
VGH
VCOM
V12

Does LED3_AVDD light up when TV is turned on?

[Nix125]

Hi nomoresonys thanks for the links on ebay I checked them out a few days ago hopefully tcon board will fix the issue. Dudm we tried with and without the lcd connect which made no difference. There is no led on the tcon board?

Many thanks

[nomoresonys]

Did you test those three spots in Buds post #14? VGH
VCOM
V12

[Nix125]

Hey nomoresonys I can see VGHC, VGL and VGB12 on the TCOM board is this the pads to check. I have a multimeter what am I checking for? Thanks

[nomoresonys]

Damn if I know, I was trying to learn what they should read myself.

[Nix125]

�� lol were see if the Tcom board I ordered will fix the tv should arrive late next week.

[budwich]

Originally Posted by Nix125

Hey nomoresonys I can see VGHC, VGL and VGB12 on the TCOM board is this the pads to check. I have a multimeter what am I checking for? Thanks

good question but probably not important. The reason being, is just measure and post the results. The "wrong voltage" will usually standout... low, high or otherwise. You aren't looking for an absolute value at this point.

further, the labeling isn't going to be "exact" for all set and hence look for things like "VXXX" or so as potential points of interest. As budm has indicated, those that he listed are a good "type" to look for.