Hey guys, ive got a samsung un43ru7100f that when turned on, only the backlights flash every few seconds. The guy i got the tv from said he took it to a tv repair place and said it needed a new lcd panel. What are your thoughts?
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Last edited by a460guy; 07-31-2021, 02:44 PM. -
Re: Samsung un43ru7100f no picture, flashing backlight
Flashing backlights on a Samsung is usually a sign of bad backlights. To confirm, unplug the cable between the power supply and main board and this will force the backlights on. -
Re: Samsung un43ru7100f no picture, flashing backlight
I did this and the backlights come on and stay on.Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
Second test is to only connect one side of the TV at a time and see if one side displays an image. Also see if the backlights stay on with both sides disconnected as well. Don't think this model has a tcon board so not sure what the outcome may be in models with integrated tcon boards.Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
This model does not have a tcon board. When only one ribbon is connected i get solid backlight and sound but no picture. This works with either ribbon. If only one is connected i get solid light and sound......i found a main board on ebay for 30 bucks so i will try that. But i would like to find the fault. Any ideas?Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
Could still be a bad panel. I've seen bad panels on models with integrated tcons that cause the TV not to turn on.Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
Don't buy main board, you are here to receive advices so don't take your own decisions please, this can end in board scarce availability for others. If i'm not wrong this behaviour is due to a bad capacitor on one panel's small board, you have to remove them all one at a time and test, after that you tested for short on them, it exists a C56 or C53 start with it..Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
In today's samsung models tcon is integrated with main..Last edited by Davi.p; 08-05-2021, 07:16 AM.Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
Oh great! Yes i would rather find the fault. Here is a pic of the main board. Could you show me where the common fault area is?Attached FilesComment
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Re: Samsung un43ru7100f no picture, flashing backlight
Ok on the boards with the flex ribbon going to the panel.....i see...will checkComment
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Re: Samsung un43ru7100f no picture, flashing backlight
sorry , my cellular, i rewrite last sentence.
after that you test for short on them, if exists a C56 or C53 start with it..
To remove them if you don't have hot air then take a cutter with very sharp blade, put slow pressure on the basement of them and cut them away, very slow if not them flies away. Remounting of them's very easy, dont add solder only flux and use stilus iron.Last edited by Davi.p; 08-06-2021, 02:43 AM.Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
What temp would you recommend for hot air? And thats pretty close to the ribbon cable....will that come loose if it gets hot? Also i checked all of them for short using the area in my pic marked red for ground. Is this not good enough to test? Or do i have to remove them and check there value? What should they be rated at?Comment
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Re: Samsung un43ru7100f no picture, flashing backlight
PicAttached FilesComment
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Re: Samsung un43ru7100f no picture, flashing backlight
I don't have a professional hot air station, only a portable one that i've used few times, so i don't know, if i remember rohs tin melts at around 230 degrees european measure, for the ribbon you can mask it with aluminum foil, the area for gnd is ok but remember that not always shorts are revealed by a 3v lowcurrent tester, so you must remove them mandatory, the caps are 25v minimum, much probably them are those connected in parallel to Avdd tension of tcon so start with them, that are the biggest ones. Aftet each removing do a test of tv.Last edited by Davi.p; 08-07-2021, 05:41 AM.Comment
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Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
Hello Community!
CASE DETAILS
Promblem Signs: Backlight on 1 sec off 7sec > repeat && Red standby light: 1blink, off 3 sec, 2 blinks, off 5 secs, 2 blinks, off 3 sec, restart cycle
13V present on powerboard output. Backlight continues flashing after removing cables to pannel one at a time and even with both disconnected. NOTE: backlight STOPs flashing and remains on when connector between powerboard and mainboard (note Tcon built in) is disconnected.
Tried inserting firmware on USB and left it in for a few hours, but no change
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I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged... -
Greetings fellow DYIers, the moment I discovered this community forum, nostalgia has hit me pretty hard, this early web 2.0 look and feel is close to home. I can't describe my happiness seeing active forums that survived today, and its not just yet another centralized propriety subreddit.
Before I describe my issue with this particular TV, I would like to let you know that I do have basic electronic competence, and some electronic component knowledge. I also am an electrical installation technician student, although we exclusively study alternating currents and our primary...
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