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-   -   Samsung UE55H6200 Sound but no video display (https://www.badcaps.net/forum/showthread.php?t=78858)

Nix125 08-17-2019 04:10 AM

Samsung UE55H6200 Sound but no video display
 
3 Attachment(s)
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 08-17-2019 04:14 AM

Re: Samsung UE55H6200 Sound but no video display
 
With tv unplugged, unhook cable from powerboard to mainboard, plug tv back into power, see if backlights come on.

Nix125 08-17-2019 04:38 AM

Re: Samsung UE55H6200 Sound but no video display
 
Thanks for the response nomoresonys as soon as I get home I willteat

Thank you

Nix125 08-17-2019 07:32 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 08:14 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 08:29 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 08:38 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 08:42 AM

Re: Samsung UE55H6200 Sound but no video display
 
Thanks for the reply:) do you have any guidence on how to test?

nomoresonys 08-17-2019 08:56 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 09:04 AM

Re: Samsung UE55H6200 Sound but no video display
 
Thanks for looking nomoresonys. Take a look at my attachment you should be able to zoom up as its decent resolution?

nomoresonys 08-17-2019 09:33 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 10:36 AM

Re: Samsung UE55H6200 Sound but no video display
 
One there that seems to be a match: https://www.ebay.co.uk/itm/5555T10C0...UAAOSw2QtdJ2za

nomoresonys 08-17-2019 10:49 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-17-2019 03:02 PM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-18-2019 12:11 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-18-2019 06:06 AM

Re: Samsung UE55H6200 Sound but no video display
 
Did you test those three spots in Buds post #14? VGH
VCOM
V12

Nix125 08-18-2019 06:45 AM

Re: Samsung UE55H6200 Sound but no video display
 
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 08-18-2019 09:28 AM

Re: Samsung UE55H6200 Sound but no video display
 
:lolsign: Damn if I know, I was trying to learn what they should read myself.

Nix125 08-18-2019 09:39 AM

Re: Samsung UE55H6200 Sound but no video display
 
�� lol were see if the Tcom board I ordered will fix the tv should arrive late next week.

budwich 08-18-2019 10:21 AM

Re: Samsung UE55H6200 Sound but no video display
 
Quote:

Originally Posted by Nix125 (Post 910821)
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.


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