Just wanting some opinions, or possible main board?
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Last edited by kevinm34232; 03-31-2018, 12:56 PM. -
Re: Samsung UN55KS8000FXZA Bad Panel?
n/a mistook it for an ccfl tv, it's an led tv.Last edited by nomoresonys; 03-31-2018, 02:19 PM. -
Re: Samsung UN55KS8000FXZA Bad Panel?
Vertical, sorry that pic is upside down. Also hazy colors on the sides that come and fade away.Last edited by kevinm34232; 03-31-2018, 01:49 PM.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Maybe try heating up mainboard with a hair dryer, check for changes in picture.Last edited by nomoresonys; 03-31-2018, 02:17 PM.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Looks like some have fixed theirs by flipping the data cable that goes from powersupply to mainboard, bad or dirty connection I guess.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Bad panel due to those dark clouds on the sides.Never 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: Samsung UN55KS8000FXZA Bad Panel?
Data cable? Do you mean from the main board to the panel?Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Bad panel was my first thought, the vertical lines looked same as this video, a lot of the replies said it cleared the problem up:
https://www.youtube.com/watch?v=7-t8rOKHBw4Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Dark patches of dark clouds are the give away for bad panel.Never 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: Samsung UN55KS8000FXZA Bad Panel?
Ya not sure what they're talking about in that video...Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
It's the cable going between the two big boards.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
I understand that, but that does not carry any video data as far as I know. They had an issue with the TV cycling on and off which makes more sense though.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
https://www.youtube.com/watch?v=CKqDYCkBPJk was wrong video, meant to post this one BUT he seems to have vertical lines but no black blotches like you have which probably means a bad panel.Last edited by nomoresonys; 03-31-2018, 04:08 PM.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
https://www.youtube.com/watch?v=CKqDYCkBPJk Won't fix it but a pretty good test for bad panel.Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
I try one ribbon cable at a time that goes into the panel. Yuck
another LCD with tcon embedded.Did I leave the soldering iron on?Comment
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Re: Samsung UN55KS8000FXZA Bad Panel?
Tried that, won't stay on without both ribbons connected.Comment
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- Prior owner tried a replacement main board. No difference.
- Samsung 2x red blinking standby LED = panel fault
- Jumpered FB_TRDY_1 (pin 1 CN1300 left. main tcon->left side buffer boards) and FB_TRDY_3 (pin 95 CN1301 right. main tcon->right side buffer boards) This allows testing individual T-Con (on main board) connection to panel on this Samsung. Found fault on left side (viewing from rear of TV)
- Each side has 2 buffer boards, disconnected left side flex between 2 buffer boards. Fault is on the left most board.
- Tape masking eventually isolated to CN1300 pin 15 (CKV4_GOA) Display
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TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.
tcon is built into mainboard.
Only one cable goes to panel boards.
there is a cable from one panel board to the other that links them.
cost cutting measure that results in us having harder time to diagnose.
removing the link to the second panel board allows TV to stay on with stable backlight but no image.
used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board.... -
Well, I will be the first to admit that I screwed up...
In attempting to replace the backlight in a UN65TU8000, I made a hole through one of the ribbon cables between the board that runs along the bottom of the back of the TV and the panel. This lead to a between a 1/4 to 1/2 inch vertical stripe running the full height of the image.
I don't have the experience; personally, to solder a bridging wire for the paths that were cut. So, I have been on the hunt for other Samsung TV's of similar size.
I have 2 that I have found and have in my possession. ... -
I came across a 50inch TU8000 that wouldnt start up properly (blinking stand-by light, backlights would cycle on and off).
When i opened it up and removed the power to the mainboard the backlights powered up and everything looked uniform.
When reconnected the mainboard but disconnected the flex cable to the panel i heard the TV startup with the intro sound.
Later I checked for shorts on the panel PCB boards but could not find anything.
When I took a look with the FLIR i noticed the 2 resistors...
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