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Old 01-28-2022, 07:59 AM   #1
mi16rs
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Default NEVIR NVR-7402-40HD-N no standy by light

Hi

i have a NEVIR NVR-7402-40HD-N whit powersuply board CQC13001103908
the tv as no stanby light and wont turn on , i find a Diode faulty and replace it but still the same , i dont have any electric schem for it , could some one help me whit this ?

Thanks
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Old 01-28-2022, 09:15 AM   #2
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Test the powerboard to see where you stand, video demo there: https://www.youtube.com/watch?v=XH9GfkGQX1I
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Old 01-28-2022, 09:17 AM   #3
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Some straight on focused pictures of the whole back and of each board would help a lot.
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Old 02-03-2022, 04:33 AM   #4
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Hi

Sorry for the late reply , in attachments are the pictures off the board

the diods mark in red one of theme was faulty so i replace it but still not work

i have meseured the voltage on the white conectors and it as no power so the problem on power suply but im not able to manage were the problem is , the main fuse is ok .

please could some one help me on this ??

Thanks
Attached Images
File Type: jpg IMG_0409.JPG (142.5 KB, 14 views)
File Type: jpg IMG_0410.JPG (104.8 KB, 8 views)
File Type: jpg IMG_0411.JPG (125.7 KB, 6 views)
File Type: jpg IMG_0413.JPG (95.1 KB, 6 views)
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Old 02-03-2022, 06:49 AM   #5
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

It usually starts with powerboard testing, you have a multimeter? did you look at the video I linked? here's another: https://www.youtube.com/watch?v=4v8DcqCNG4A
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Old 02-03-2022, 08:07 AM   #6
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Yes i have measure the voltages on the white conectro that goes to the logic board and i dont have any voltage on it
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Old 02-03-2022, 08:18 AM   #7
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Ok, unplug everything all connectors from the powerboard, plug power cord back into powerboard, see if you have the standby voltage.
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Old 02-03-2022, 08:19 AM   #8
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

i did that already and still no standby voltage
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Old 02-03-2022, 09:57 AM   #9
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Picture of powerboard isn't very clear, need standby voltage or nothing's going to work, simple things first, test power cord for continuity, make sure fuse on powerboard is ok, if ok, maybe move on to check bridge rectifier.
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Old 02-03-2022, 09:59 AM   #10
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

https://www.google.com/search?client...rB7gLLy6TwCw18
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Old 02-03-2022, 10:09 AM   #11
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Check all diodes and resistors, at least the bigger ones, the tiny ones are a pain to deal with and should make sure that it is a tiny one at fault before messing with those. If any test odd, take out of circuit and test again, can search for resistor color charts if needed.

Last edited by nomoresonys; 02-03-2022 at 10:11 AM..
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Old 02-03-2022, 11:08 AM   #12
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Yes i have done that and its all ok , this board as a ac/dc converter LNK7666E but i dont know how to check if this is ok or this is the one its faulty .
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Old 02-03-2022, 12:08 PM   #13
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Quote:
Originally Posted by mi16rs View Post
Hi

Sorry for the late reply , in attachments are the pictures off the board

the diods mark in red one of theme was faulty so i replace it but still not work

i have meseured the voltage on the white conectors and it as no power so the problem on power suply but im not able to manage were the problem is , the main fuse is ok .

please could some one help me on this ??

Thanks
Can't zoom on picture. Center white connector is 12v? What voltage do you have on main capacitor? Your mosfet on aluminum heatsink has a diode that is connected to drain of your mosfet. What is voltage across that diode?
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Last edited by dskall; 02-03-2022 at 12:20 PM..
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Old 02-03-2022, 12:20 PM   #14
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

only the blue mark conector as the stanby cable on , the red ones does not have anything conected , as for the main capacitor voltage this is a 100uf400v and i read 300v
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Old 02-03-2022, 12:24 PM   #15
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Does white connector in center of board say power upgrade? Your pictures aren't good enough to see.
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Old 02-03-2022, 12:27 PM   #16
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

its not a mosfet its a LNK7666E ac/dc converter
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Old 02-03-2022, 12:32 PM   #17
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

see iff helps
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Old 02-03-2022, 12:44 PM   #18
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

Quote:
Originally Posted by mi16rs View Post
its not a mosfet its a LNK7666E ac/dc converter
Looks like diode next to switching controller. What is voltage across it?
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Old 02-03-2022, 12:56 PM   #19
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

do you mean the one is mark in red??? puting the multimeter on it in DC does not show any voltage
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Old 02-03-2022, 01:03 PM   #20
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Default Re: NEVIR NVR-7402-40HD-N no standy by light

If one end is connected to last pin on controller and measuring across diode shows no voltage, then I would say you have bad controller.
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