samsung tv ue43ru7400u dark screen problem help

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

the power comes from the power cord that you plug back into the powerboard.

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

it's cnm801 connector, unhook the cable at that connector to try that test.

[dskall]

Re: samsung tv ue43ru7400u dark screen problem help

If that doesn't work, you can monitor led voltage. If voltage is stable, then it's probably not backlights.

[lotas]

Re: samsung tv ue43ru7400u dark screen problem help

Hi there is only one power lead coming from the powerboard and its going to the mainboard so when i disconnect the lead there is no power going to anythink

Why only one, you have two cables connected 1 - main, 2 - led.

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

Hi there is only one power lead coming from the powerboard and its going to the mainboard so when i disconnect the lead there is no power going to anythink

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

ok thanks i wiil give it a go

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

easy test, make sure the tv is unplugged from power, unhook cable from powerboard to mainboard, plug power cord into powerboard, plug into outlet,
see if backlights come on and stay on, always make cable connections with tv unplugged from power to avoid and errant surges that could happen.

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

Yes.

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

Hi this a edge lit Tv can i still do that test in #18 thanks for your help

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

READ READ post #18 DO TEST.

[vinceroger69]

Re: samsung tv ue43ru7400u dark screen problem help

I would say faulty backlights.

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

Hi ive just had a another look at the tv and im not to sure if it is the backlight ive made a video could some one have a look at it to see if it is the backlight https://www.youtube.com/watch?v=fJe-APbbSjE

[vinceroger69]

Re: samsung tv ue43ru7400u dark screen problem help

Hi is there a way of testing the backlight before a take it apart

yes if you have a backlight tester,
what happens if you remove the cable between mainboard and power supply do the backlights power on then?
This will give you a rough idea whats involved to change backlights but remember big risk of cracking lcd panel!
https://www.youtube.com/watch?v=HFi2slA4ZK8

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

Hi is there a way of testing the backlight before a take it apart

[vinceroger69]

Re: samsung tv ue43ru7400u dark screen problem help

thanks for your help on this im going to take it apart and have a look at it nothing to lose

This thread is worth a read
https://www.badcaps.net/forum/showth...=samsung+burnt

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

thanks for your help on this im going to take it apart and have a look at it nothing to lose

[brucetv]

Re: samsung tv ue43ru7400u dark screen problem help

Most likely you have a short in the backlight bars since this is a edge lit Tv. Alot of times is actually melts the diffuser and will leave light bleed on the bottom where the leds got too hot after you replace the led bars and you can't buy new diffusers so is it worth repairing? Not on that size Tv. You have to pull the panel just to get to the backlights and if the diffuser is melted there is no use in replacing them because they are just going to leave light bleed across the bottom of the panel which looks like crap. Samsung quality went to hell a long time ago spending more money fighting corruption charges than on engineering.

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

working blind here without pictures.

will do pictures.tomorrow

[nomoresonys]

Re: samsung tv ue43ru7400u dark screen problem help

nevermind, too much trouble trying to help, when simple instructions are not followed.

[garysnooker]

Re: samsung tv ue43ru7400u dark screen problem help

Is your screen uniformly dark?

Hi yes it is