samsung un40eh5000f

[stevemaho]

Hi guys hope i can get some help here with this samsung tv
I wasnt getting any voltage output and no standby light so replaced the power supply board and now i get standbt voltage on the pins and wn remove the connector from mainboard to power supply back light comes on but wn i plug back connector the standby voltage goes to 0 backlight goes off and black screen wn i test the main board side no voltage coming in
What do you think can be the prob?

[Hamie]

Re: samsung un40eh5000f

I'd guess the mainboard has a short and pulls down the standby voltage.

Plug the tv in for a few minutes, then unplug. touch a few of the components on the main board. See if anything is too hot to touch.

[stevemaho]

Re: samsung un40eh5000f

Ok did that but nothing gets got but i trace the connections and it goes to a 17-33z voltage regulato0r so gonna remove see if voltage reaches to that point

[stevemaho]

Re: samsung un40eh5000f

Ok just replaces the mainboard now the board does not draw the 5.3v away so thats good and the mainboard gets power tested a couple points but still no standby light or anything
Any help will be appreciated

[michael first]

Re: samsung un40eh5000f

Hi,I'd check the connector on the power supply and the flat cable to the main board.

Quite often you'll find the body of the connector yellowish, so the cure is to replace both

of them.

[stevemaho]

Re: samsung un40eh5000f

Cables are fine mainboard getting power now than with old main board tested on main board and i get the 5v stanby but i guess might be tcon board now need to be replaces

[diif]

Re: samsung un40eh5000f

Cables are fine mainboard getting power now than with old main board tested on main board and i get the 5v stanby but i guess might be tcon board now need to be replaces

Measure voltage both sides of the fuse on the tcon.

[stevemaho]

Re: samsung un40eh5000f

ok no voltahge o the fuse on tcon

[CapLeaker]

Re: samsung un40eh5000f

Post a high resolution pic of your main board.

[diif]

Re: samsung un40eh5000f

ok no voltahge o the fuse on tcon

You measured both sides ? Is there continuity across the fuse ?

[stevemaho]

Re: samsung un40eh5000f

Fuse is good have continuity but seems like no voltage coming across from mainboard to tcon but this is a new board i just bought off ebay and was told it was tested and working fine
Thanks in advance guys

[budm]

Re: samsung un40eh5000f

Regardless to the T-CON board, do you get the backlights to come on?
It sounds like defective new main board to me if ALL the power supplies Voltages are OK.

"Ok just replaces the mainboard now the board does not draw the 5.3v away so that's good and the mainboard gets power tested a couple points but still no standby light or anything"
The key point is that you are not even getting the Standby light with the replacement main board.

[stevemaho]

Re: samsung un40eh5000f

BUT in this case the STAND BY light comes on only when tcon gets power correct?
So the replacement board has an issue most likely cause the tcon not getting and voltage from mainboard not even by the fuse?
And what are the chances that the ribbon cable from mainboard to tcon is bad?
Anything else to chk or just return board to seller?
Thanks

[budm]

Re: samsung un40eh5000f

Standby light is for telling you the TV is not on and it is in standby mode. You will have to look up the user manual for your model to see if that light in front is for power on indicator or standby indicator.
Also you are not telling us if you ALL the Voltages from the power supply and the backlights or not with your new board when you turn on the TV with the remote or with the switch on the TV..

http://downloadcenter.samsung.com/co...0404145915256/[UE4000-5000-ZA]BN68-04499A-02-ENG-1016.pdf

[stevemaho]

Re: samsung un40eh5000f

Ok wn i press power button on remote no lights come on in front and no power drop on the standby pin 5v and no power on fuse on tcon board either.
This model has no power button the side its a touch model and all the pins on smp are correct the 13v and the 5v all are correct on the pins and wn i remove cable from mainboard to smp backlight comes on fine
Thanks

[budm]

Re: samsung un40eh5000f

Sounds like your supposedly good replacement board is no good and we already know that the power supply board is good.

[CapLeaker]

Re: samsung un40eh5000f

Sounds like your main board is bad. You can try to reflow the main IC on the main board. If that is a replacement board, send it back. It's bad.

[dick_barton]

Re: samsung un40eh5000f

What voltages do you have on Power ON/OFF Pin 14 of CNM803 and also on BLU On/Off Pin 6 of CNM803 when you in standby and when you try to come out of standby.

[stevemaho]

Re: samsung un40eh5000f

Which ic u referring to to relow?
And on pin 14 5.3v and pin 6 12.52v when i hit power button on remote voltage doesn't change
Thanks guys

[thoma]

Re: samsung un40eh5000f



WAIT UNTIL GET MANUAL APPEARS