Samsung UE480H6400AK

[StephenU]

Morning all, I have a Samsung UE480H6400 which had BL failure, have replaced all faulty BL's, tested and now BL comes on.
Problem i'm seeing is when you power the TV on with TCON connected there is no picture no BL's but the TV is still powered on, You can hear it working when pressing volume up or down on remote or side Toggle.

If I disconnect either ribbon going from TCON to Panel the backlights come on Still nothing on the screen though. Could one or more of the ribbons on the panel be damaged or could the drivers in the ribbons be shorted causing this NO PICTURE NO BL fail when all connected up??

Hope this make sense, and thanks for any help in advance.



S.

[nomoresonys]

Re: Samsung UE480H6400AK

Test all pins on connector from mainboard to powerbard on powerboard side, all boards connected. Test in standby/plugged in but off, then apply power report both conditions, example: pin 1 bl-on=0 volts standby and 3.3 powered on, report results for every pin. How to video in my signature below.

[vinceroger69]

Re: Samsung UE480H6400AK

is the lcd panel pcb on the top or bottom of the screen i wonder if its water damaged from people cleaning the screen

[StephenU]

Re: Samsung UE480H6400AK

is the lcd panel pcb on the top or bottom of the screen i wonder if its water damaged from people cleaning the screen

PCBS are on the bottom of this model. Thanks

[vinceroger69]

Re: Samsung UE480H6400AK

PCBS are on the bottom of this model. Thanks

have you checked them over for any sign of liquid damage and corrosion

[StephenU]

Re: Samsung UE480H6400AK

Test all pins on connector from mainboard to powerbard on powerboard side, all boards connected. Test in standby/plugged in but off, then apply power report both conditions, example: pin 1 bl-on=0 volts standby and 3.3 powered on, report results for every pin. How to video in my signature below.

Thanks for the reply I will do this tonight when home and report back the findings.

[StephenU]

Re: Samsung UE480H6400AK

Test all pins on connector from mainboard to powerbard on powerboard side, all boards connected. Test in standby/plugged in but off, then apply power report both conditions, example: pin 1 bl-on=0 volts standby and 3.3 powered on, report results for every pin. How to video in my signature below.

Here are my findings >>

[nomoresonys]

Re: Samsung UE480H6400AK

Not sure, maybe something on tcon or panel, causing the no psu-on voltage?

[dick_barton]

Re: Samsung UE480H6400AK

Is this a 3D smart tv. Do you have any photo's of the circuit boards and the interconnections between them.

[budm]

Re: Samsung UE480H6400AK

We need to see the pictures of what we are dealing with.

[StephenU]

Re: Samsung UE480H6400AK

Is this a 3D smart tv. Do you have any photo's of the circuit boards and the interconnections between them.

Yes Dick I do believe this is the 3D smart TV - I will get pictures of all boards and upload tonight.

The pictures below are of the exact same model if any good until I get home later on tonight.

Thanks

S.

[StephenU]

Re: Samsung UE480H6400AK

We need to see the pictures of what we are dealing with.

Budm I have attached pics of the exact same boards within my set above, tonight I will upload my own and showing all interconnections etc.

TIA


S.

[budm]

Re: Samsung UE480H6400AK

"If I disconnect either ribbon going from TCON to Panel the backlights come on Still nothing on the screen though. " So if all cables in place, do you get 12V at the T-CON fuse?

[StephenU]

Re: Samsung UE480H6400AK

"If I disconnect either ribbon going from TCON to Panel the backlights come on Still nothing on the screen though. " So if all cables in place, do you get 12V at the T-CON fuse?

Hi budm I get 12v at the fuse both sides with the ribbon connected and disconnected.

S.

[gabiz_ro]

Re: Samsung UE480H6400AK

I think is same T-CON
Check other voltages.
https://www.badcaps.net/forum/showthread.php?t=73506

[budwich]

Re: Samsung UE480H6400AK

Here are my findings >>

ok... provide some more detail about these. "tcon disconnected"... what does that mean.... totally or "one side".

back up abit, you indicated, with either tcon to panel disconnected, get BL but no display... but is the display blank or white. can you provide a picture of display of these two "scenarios"?

[budm]

Re: Samsung UE480H6400AK

Yep, shows us the screenshot when having just one ribbon cable between TCON and panel connected one at a time.

[StephenU]

Re: Samsung UE480H6400AK

ok... provide some more detail about these. "tcon disconnected"... what does that mean.... totally or "one side".

back up abit, you indicated, with either tcon to panel disconnected, get BL but no display... but is the display blank or white. can you provide a picture of display of these two "scenarios"?

Tcon disconnected totally, and tcon to panel either or both side BL comes on.

The display is blank. As soon as I get a minute to get back to the TV I will grab more pics and also more voltage measurements.

TIA for your reply.

S.