HI, everyone needing a little help I have a 70 inc tv that has the turning on and back off issue. changed the main board no luck, checking the power supply and JP819 is only showing 4v i have 12.90 standby voltage can i assume that the power supply needs replacing. any help will be greatly appreciated.
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Re: Samsung un70nu6900 power supply issue
You have to check that. And disconnect the cable that goes to the motherboard and plug it into a power outlet, the backlight should light up.Attached Files -
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Re: Samsung un70nu6900 power supply issue
yes, and the back light comes on and stay on as long as the cable is disconnected from main board.Comment
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Re: Samsung un70nu6900 power supply issue
Well, it means the power supply is working, or you also purchased a non-working board, or you do not have a working panel.
Now try to connect it back to the motherboard, but disconnect the cables that go to the panel and check it will turn on from the remote control.Attached FilesComment
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Re: Samsung un70nu6900 power supply issue
In the image your showing check jp821 to ground for voltage it shows 12.91.Comment
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Re: Samsung un70nu6900 power supply issue
With the cable to main board plugged in and the 2 ribbon cables unplugged tv will turn on with remote but turns off after a second or 2.Comment
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Re: Samsung un70nu6900 power supply issue
Nothing to worry about, no load (MB didn't start)Comment
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Re: Samsung un70nu6900 power supply issue
I'm not sure that I'm getting the 12v power on voltage.Last edited by yankys; 10-13-2022, 03:17 PM.Comment
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Re: Samsung un70nu6900 power supply issue
Connect one at a time (first one cable, check, disconnect the first, connect the second and also check.Comment
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Re: Samsung un70nu6900 power supply issue
yes, 12.91 at the jumper in the image you sent but not at pin 8 in the plug that go to the main board, and when I do the cables, it turns on with remote and back of with in a second unless I unplug the main power cable to the main board then it will stay on.Comment
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Re: Samsung un70nu6900 power supply issue
On 8 pin. should not be 12v, this is POWER ON (there is a signal to turn on the operating mode from the motherboard, and the jumpers are also connected to the 3-5-7-9 (12v) connector.Attached FilesComment
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Re: Samsung un70nu6900 power supply issue
If voltage is 12.91 at the jumper shown in the image does this mean power supply is good.Comment
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Re: Samsung un70nu6900 power supply issue
Yes, if the unit were not working, then these 12.91v would not exist and the backlight would not light up.Comment
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Re: Samsung un70nu6900 power supply issue
what should i check to further diagnose this issue?Comment
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Re: Samsung un70nu6900 power supply issue
Try disconnecting these cables connecting the brackets, one at a time and with different motherboards (from your own and the one you bought).Attached FilesComment
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Re: Samsung un70nu6900 power supply issue
In these models (NU series), the panels (the matrix itself) die very often.Comment
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Re: Samsung un70nu6900 power supply issue
with disconnecting these one at a time am I looking to see if the tv stays on?Comment
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Re: Samsung un70nu6900 power supply issue
Yes
Here is a video that can help determine the malfunction (and all the malfunctions of these models are panels).
https://www.youtube.com/watch?v=atNmhu7HMj0
https://www.youtube.com/watch?v=zGAVbMQrSekLast edited by lotas; 10-13-2022, 05:05 PM.Comment
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Re: Samsung un70nu6900 power supply issue
And if possible, then disable the WI-FI module to check.Comment
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Hello Everyone, this is my first post and I am excited to be a part of such a great community. I've been reading these forums for awhile and there really is some good friendly people here. No bashing and being rude like 90% of other forums Ive been to. Lets get to the good stuff.
I have two years of college in Electronics Engineering Technology. Ive been tinkering with electronics sine about 1990. I know enough just to be dangerous, so be gentle.
Make: Samsung
Model: UN60ES6500FXZA
Power Supply P/N: BN44-00525A
Symptoms: The TV was... -
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