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Old 05-13-2022, 11:46 AM   #1
garysnooker
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Default samsung tv ue43ru7400u dark screen problem help

Hi its like the brightness is trun right down ive reset the TV.help
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Old 05-13-2022, 12:01 PM   #2
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Default Re: samsung tv ue43ru7400u dark screen problem help

Some pictures of the problem would be nice.
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Old 05-13-2022, 12:18 PM   #3
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Default Re: samsung tv ue43ru7400u dark screen problem help

its to dark for pictures
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Old 05-13-2022, 01:04 PM   #4
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Default Re: samsung tv ue43ru7400u dark screen problem help

Bad backlights.
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Old 05-13-2022, 01:10 PM   #5
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Default Re: samsung tv ue43ru7400u dark screen problem help

is that a big job
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Old 05-13-2022, 01:26 PM   #6
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Default Re: samsung tv ue43ru7400u dark screen problem help

there is a Picture but it is dark
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Old 05-13-2022, 02:31 PM   #7
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Default Re: samsung tv ue43ru7400u dark screen problem help

Sorry your giving little to go on, but my tv is dark, what's wrong.
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Old 05-13-2022, 02:48 PM   #8
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Default Re: samsung tv ue43ru7400u dark screen problem help

Hi is there a way i can test the backlights.
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Old 05-13-2022, 02:51 PM   #9
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Default Re: samsung tv ue43ru7400u dark screen problem help

Is your screen uniformly dark?
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Old 05-13-2022, 02:52 PM   #10
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Default Re: samsung tv ue43ru7400u dark screen problem help

.

Last edited by nomoresonys; 05-13-2022 at 03:22 PM..
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Old 05-13-2022, 03:11 PM   #11
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Default Re: samsung tv ue43ru7400u dark screen problem help

Quote:
Originally Posted by dskall View Post
Is your screen uniformly dark?
Hi yes it is
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Old 05-13-2022, 03:17 PM   #12
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Default Re: samsung tv ue43ru7400u dark screen problem help

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

Last edited by nomoresonys; 05-13-2022 at 03:26 PM..
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Old 05-13-2022, 03:27 PM   #13
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Default Re: samsung tv ue43ru7400u dark screen problem help

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Originally Posted by nomoresonys View Post
working blind here without pictures.
will do pictures.tomorrow
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Old 05-14-2022, 05:47 AM   #14
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Default 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.
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Old 05-14-2022, 06:46 AM   #15
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Default 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
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Old 05-14-2022, 07:01 AM   #16
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Default Re: samsung tv ue43ru7400u dark screen problem help

Quote:
Originally Posted by garysnooker View Post
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
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Old 05-15-2022, 07:40 AM   #17
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Default Re: samsung tv ue43ru7400u dark screen problem help

Hi is there a way of testing the backlight before a take it apart
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Old 05-15-2022, 08:09 AM   #18
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Default Re: samsung tv ue43ru7400u dark screen problem help

Quote:
Originally Posted by garysnooker View Post
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

Last edited by vinceroger69; 05-15-2022 at 08:13 AM..
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Old 05-18-2022, 12:38 PM   #19
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Default 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
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Old 05-18-2022, 12:50 PM   #20
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Default Re: samsung tv ue43ru7400u dark screen problem help

I would say faulty backlights.
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