⟐ Answer accepted July 08, 2025 at 17:13 MST

⟐ Commented June 09, 2024 at 19:44 MST

We have a 4 year old UN55MU6290 Samsung TV. Last week while it was on it made a pop sound and turn off. Once I had a bit of time over the weekend I opened it up to have a look.

First I did a visual inspection and didn’t find any component damaged or burnt (neither on the power supply nor on the main board). I took a multimeter and first thing I checked the fuse: open circuite.

I thought easy enough… I ordered a package of matching fuses (T5AH250V). The fuses arrived today. I replaced the fuse reassembled the TV plugged it in and… it didn’t work.

I open up the TV again checked again the fuse I had just installed and… it had blown.

I then replaced the fuse again. This time I did not reconnect the neither main board nor the backlight to power supply board and I powered it up with the TV open.

The fuse blow again as soon as I plugged in the power. So for sure there is something wrong with the power supply board. It burns the fuse as soon as powered up even if disconnected from the rest of the TV.

Now I can order a new power supply board (BN44-00807K) for cheap. The question now is how can I check that there is nothing wrong with the backlight or the main board that cause the damage to the power supply board and will damage the new power supply board the same way?

⟐ Commented August 28, 2023 at 19:51 MST

possibly picture of the problem with connection

⟐ Answer accepted February 07, 2021 at 8:11 MST

⟐ Edited by author February 25, 2020 at 21:34 MST

⟐ Answered January 08, 2020 at 8:29 MST

update 1: Extra images of the line (same part of screen w/ different screen picture)

Bottom

Top

update 2: Added video

video 1 (static background)

video 2 (active background)

I have one wide color line on my screen. Couple times is disapiers somehow but most of time is permanent. What I did already:

• Disconnect the LCD Flex Ribbon. Clean each of the connections with a 99% isopropyl. (non-conductive alcohal) and reinstall them - didn’t help
• I switch t-con Flex Ribbon from left side to right side - didn’t help also. So probably flex ribbons is ok.

By symptomatic - what chance that this is an issue with a t-con board? Or it is most probably an issue with flex ribbon to LCD?

I could replace board myself but most probably could do nothing flex ribbon to LCD.

Thanks!

⟐ Answer accepted September 08, 2019 at 7:27 MST

⟐ Commented June 30, 2020 at 10:05 MST

Just installed it last weekend mounting it on the wall without problems.

After 4 days it started to show some vertical lines over the left side, they disappeared after some time. Next day the colored lines didn't disappear, i looked for common problems and tried hitting the TV in the bottom left side and power cycling the tv and most of the lines disappeared.

Only a 1/4" thick black line remained almost in the center of the screen. As if there were no signal. The pixels are turned off from top to bottom.

Then i checked the ribbon cables as suggested in other threads, everything looks fine.

What else can i check?

Regards

[Edit] Added some photos

I took this photo when i finished mounting the tv.

There is a phooto showing the black line

A close up to the top and bottom of the black line. The pixels are turned off, you can notice the line since the tv is turned on, they look kinda gray when all the pixels are black.

I tried exchanging the ribbon cables, and the line was still there. I removed the front bezel, but wasn't able to test applying pressure over the T connections while turned on because i had to remove the PCBs to be able to flip the panel.

⟐ Commented July 09, 2018 at 19:34 MST

i have a samsung UN55JS9000FXZA it works perfect but randomly it will cutt of and power back on and will continue to work it does this sometimes within 30 minutes other times within hours im not sure if its a power board or main board maybe? hope to hear from you soon thank you

⟐ Commented March 29, 2019 at 10:06 MST

⟐ Answered April 16, 2022 at 14:59 MST

⟐ Answered April 12, 2021 at 9:10 MST

need to know if my tv is dual voltage

purchased in Canada shipped to uk

input on tv says 110-120v 50/60hz

thanks in advance

⟐ Commented September 29, 2020 at 11:09 MST

⟐ Commented July 24, 2020 at 4:48 MST

Hi

I have Samsung Smart TV UA43KU7000K.

After the warranty been expired I had Backlight Circles spots as in the attached photo.

Can you please inform the solution, shall I change the led strips and which model of led strips shall I use?

I have opened the TV and the leds where in their places

Thank you

Regards

HADI RAWAL

It is a wave in the paper reflector.

@oldturkey03

What do u suggest?

⟐ Commented January 08, 2020 at 17:51 MST

Video of it at https://youtu.be/KJEBOaOtBtI

⟐ Answer edited January 22, 2026 at 17:17 MST

The TV will successfully connect to power and try to turn itself on but it does not fully work. It will flash a VERY fast message saying ‘component’ & ‘no time’. It will then make a noise that sounds like a start up noise and the red light blinks.

I can’t find anyone else having this issue and I don’t know what to do.

⟐ Answer accepted May 20, 2024 at 20:00 MST

⟐ Commented January 30, 2024 at 7:30 MST

While performing a repair on a Samsung TV I had torn one of the yellowish flaps as shown above from this stock image I found online. I put the TV together only for there to be a huge vertical black bar where the tear occurred. I was wondering if their was a means of repairing this issue that wouldn’t require me to throw away the TV.

⟐ Commented October 12, 2023 at 4:05 MST

When I unplug the main board from power board the Back lights WORK. There are 2 cables running from power board to main board.

I replaced the mainboard but this didn’t fix anything (might be DOA but not sure)

I have checked power on the power supply board but there is no pin that is clearly marked STANDBY to look for the 3.3 or 5v.

There are 20 pins on CNM803. The first 5 are GND. The next few are VAMP (not sure what this stands for).

Then they pin out like this:

OD_LEVEL,

FAIL_COUNT

OD_ON/OFF

BLU_ON_OFF

POWER ON/OFF - (i checked this its at 4.5v)

PINS 11-17 A13V PINS 18-20 GND

⟐ Commented January 12, 2023 at 17:39 MST