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Old 06-03-2020, 11:34 AM   #1
kgavionics
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Default lnt5265fx/xaa few vertical lines?

Hi
I have a lnt5265fx/xaa LCD , i bought it for cheap 2 years ago, because it has some colored lines in the left hand side which disappear completely after about 15 min after i turn on the TV.
Since a few days, when i turn on the TV and wait about 15 min, the lines disappear except one single green line remains.
To be honest, it's not much of a problem, because the TV is still watchable, but since i have a spare time , i though i would fix it!
I think Tcon left ribbon cable might be the culprit, but i wanted to have some input from you guys,before i go ahead with my troubleshooting!

thank you in advance

Last edited by kgavionics; 06-03-2020 at 11:52 AM..
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Old 06-03-2020, 11:39 AM   #2
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Default Re: lnt5265fx/xaa few vertical lines?

Clean them and make sure they are aligned correctly, can use isopropyl alcohol and a q-tip, not too vigorous they can be delicate, good place to start.
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1) https://www.youtube.com/watch?v=4F2J1Dkf4Is
HIGH VOLTAGE HAZARD demonstration. Video by Electronic Doberman.
2) https://www.youtube.com/watch?v=4v8DcqCNG4A
Power supply board voltage testing by shopjimmy.
BE VERY CAREFUL WITH POWERSUPPLY, VOLTAGE ON PRIMARY/HOT SIDE CAN BE DEADLY, THE CAPACITORS CAN HOLD A VERY BIG CHARGE LONG
AFTER TV HAS BEEN UNPLUGGED.
3) Test connector from mainboard to powerboard on powerboard side with all boards hooked up, test with tv plugged in but off then hit power, report both conditions here, give pin number, pin description/name and condition both off and when you hit power on. So we can see all the voltages and what they are doing.
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Last edited by nomoresonys; 06-03-2020 at 11:42 AM..
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Old 06-03-2020, 08:44 PM   #3
budm
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Default Re: lnt5265fx/xaa few vertical lines?

1) What is the brand of this TV?
2) Attach good clear pictures of the whole backside of the TV showing all the boards.
3) Attach the screenshot of the screen showing the problem.
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Basic LCD TV and Monitor troubleshooting guides.
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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

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http://www.badcaps.net/forum/showthread.php?t=24809
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Old 06-04-2020, 12:05 AM   #4
neilc6
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Default Re: lnt5265fx/xaa few vertical lines?

TV is a very old Samsung LCD. Model numbers LNS (2006) and LNT (2007). Vertical lines are panel problems and possibly bad TAB bonds. Time to retire it.
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Old 06-04-2020, 05:29 AM   #5
nomoresonys
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Default Re: lnt5265fx/xaa few vertical lines?

One way to find about tabs, strip it down to the tabs and inspect them, try light pressure from the top and see if display clears up, "shim" method may work if that's the issue, many many videos on youtube covering this issue.

Last edited by nomoresonys; 06-04-2020 at 05:31 AM..
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Old 06-30-2020, 11:08 AM   #6
kgavionics
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Default Re: lnt5265fx/xaa few vertical lines?

Sorry for the late update, I've been working on another TV.
Cleaning the tabs didn't fix the problem.I also went ahead and checked all the Aluminum caps on the main-board, found few caps with a slightly higher ESR, replaced them, but still i have the same problem.I'm running out of ideas regarding this problem!I think i'm gonna sell it as it is!
Thanks
Attached Images
File Type: jpg samsung52.jpg (62.5 KB, 8 views)

Last edited by kgavionics; 06-30-2020 at 11:18 AM..
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Old 07-02-2020, 04:29 AM   #7
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Default Re: lnt5265fx/xaa few vertical lines?

insert a metal shim under the cof chip, with a toothpick touch along the chip soldering area, when you found the critical point use the soldering iron to warm that point, at sequential step each time more prolongued, when you are doing watch the results on the image.
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Old Yesterday, 08:07 PM   #8
kgavionics
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Default Re: lnt5265fx/xaa few vertical lines?

Quote:
Originally Posted by Davi.p View Post
insert a metal shim under the cof chip, with a toothpick touch along the chip soldering area, when you found the critical point use the soldering iron to warm that point, at sequential step each time more prolongued, when you are doing watch the results on the image.
Is the cof chip, the main chip on the T-con board?
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Old Yesterday, 08:33 PM   #9
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Default Re: lnt5265fx/xaa few vertical lines?

is the chip on the tab, search the web..
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Old Yesterday, 09:14 PM   #10
kgavionics
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Default Re: lnt5265fx/xaa few vertical lines?

Quote:
Originally Posted by Davi.p View Post
is the chip on the tab, search the web..
ok thanks!
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