Hello everyone. I have recently just lost the back lighting to my Insignia NS-37D20SNA14 and am would like to learn how I can fix it myself. The power turns on and i get audio but the screen is about 1% visible and flashes at a consistent rate to which you can see the image at about 5%. The image is their I just have no idea why its so unbelievably dim. Can anyone help of send me in the direction of someone who can?
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
How about:Can anyone help of send me in the direction of someone who can?Attached Files -
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
https://www.badcaps.net/forum/showthread.php?t=39740Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Here are a few pics of the internals. http://postimg.org/gallery/2wvigyv44/ Let me know what you think?Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
In the link budm posted I believe it tells you how to post pictures using manage attachments?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
i have tried multiple times to upload via attachments its not working. File sizes are all correct. Can you just use the link to see? Its much better resolution and size anyway.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Put simply you are not trying hard enough - Life is a lot simpler for us to just move on to another thread
Try adding pics 2,3 &4 one at a time - we also need to see that back of the power supply and the back and front of the main board (no pic at all?)Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Sorry. Appreciate the help. So i need to take the power supply board off the tv and get pics of the back as well? I will try to load them up asap. Thanks again, I have until the 15th to figure it out or my family will be without a tv.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Here are the boards.Attached FilesComment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
And here are some others.Attached FilesComment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
OK have just had a quick look but I cant work at it tonight
C525 looks a little bulged to me the way the light reflects - is it? have a look
flat across the end. What brand is it?
Also top left of the power supply there are 4 diodes looking at the back the
solder on the bottom one doesnt look great (maybe just the picture so check it out with a magnifying glass or just resolder them all.
Hopefully someone else on your side of the pond will join in and maybe spot a few other things and suggest a few tests.
I think this is an LED backlight - is it dim all over or are different sections dim?Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Thanks ill take a look when the kids go down. The whole tv is dim, like black... I can barley see any video input and I have to turn off the light in the room to even see it. Ill get back asap. Thanks again.
ps the brand of the tv is insignia. If your talking about the boards, im unsure.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
That is a LED TV. The LED driver is combined with the power supply. Measure the voltage on X602 (LED output).
selldoor has a good eye. I looked at the same cap on two pictures and it sticks out a bit compared to the others. Maybe that is indeed a bad cap.
One more pic please of the top right of the power supply, without that cable plugged in, so we can see the pinouts too.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Will do. top right of power supply with cable out of the way. Front and back?Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
just the front, that we can see the pin out. If your at it, you can make some measurements on that connector with the TV on. GND is chassis ground. Put all the cables back on the boards, turn on the TV and make DC voltage measurements on that connector with the cable attached.Last edited by CapLeaker; 01-07-2015, 06:02 PM.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
OK attached the top right power supply. So when making the measurements what setting does the voltmeter be on? Also with all power cords connected and tv on, how exactly do i measure x602? with the x602 connecting cable out?Attached FilesComment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Also c525 does look slightly bulged. Not trained in any of this but it does look swollen.Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Ok, i got a reading after pluging everything up and powering on. Reading the x602 Led power out connecter. 0 on all settings for DC, BUT i was pulsing at the rate the screen use to flash! What does this mean? Where do I go from here?Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
Should that be X601? marked at gn and 55v? Just put meter on vdc200
blackprobe on gnd and red on a 55v pin
EDIT no!! got it now - forget that.
With meter on vDC600 test cross the legs on that 250v cap C625 - care maybe high voltageLast edited by selldoor; 01-12-2015, 03:25 PM.Please upload pictures using attachment function when ask for help on the repair
http://www.badcaps.net/forum/showthread.php?t=39740Comment
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Re: Insignia NS-37D20SNA14 Backlight going out. Flickering! Help!
their was never a plug connected to x601. here is the measure at vDC500 in the attachment for C625Attached FilesComment
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Hello, I have a strange issue with a laptop that I'm working on fixing up for a friend of mine, and it appears as though the LCD backlight control is not reliable. The LCD backlight flickers sometimes with inconsistent brightness. The controls are no better.. when I go 1/3 of the way in the brightness controls it will get bright but flicker quite obviously, and when I go all the way to what SHOULD be full brightness, it becomes darker. The flickering is less severe at lower brightness, but more severe at higher. the backlight will literally flicker on and off when I set it to the lowest brightness...
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Hello All,
My Samsung LE52B620 started to have backlight flickering about a year ago, it would only last for about 10 mins and then the backlight would stay on.
about a month ago the backlight flickering is constant and does not stop.
I think it's a problem with the power supply board (BN44-00267b) or maybe the backlight is dying?
I checked and all the caps look to be fine.
I do not believe it is a problem with the mainboard, since I unplugged it from the power supply and the backlight came out but still flickers.
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unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even... -
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I have a identified the damaged R205 resistor, and connect a jump wire over it So it restores the backlight but causing strange problems
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This TV has been on the wall in our reception area for around 10 years and the other day the backlight failed. You could see a feint picture so we knew the screen was OK. I took the TV apart to get to the failed backlight and inject voltage in to each half of the LED strips to identify which ones had failed and 4 needed replacing. I ordered a set off of Amazon and they arrived the next day.
On fitting the new LED strips I plugged in the TV was blinded by the light!!
It was only when I partially put it all back together (including the screen) that...
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