Samsung UE55MU6120K Boot loop with backlight no video

[Davi.p]

Re: Samsung UE55MU6120K Boot loop with backlight no video

no read my post about the jumper wire..

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Now that we have listen to the others would you like to follow my advice? what do you think?

to inject a voltage from 12 to 15 I need a bench power supply that I don't have, I thought I'd solve it in another way

[Davi.p]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Now that we have listen to the others would you like to follow my advice? what do you think?

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

blue color

Nothing has changed

I masked both 10 pins and 9 consecutive pins

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Hi fanaticgames,

i had the same error.
Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.

nothing changes, it always restarts, i guess the ckv lines have nothing to do with it at this point

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Hi fanaticgames,

i had the same error.
Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.

I'll try later and update the status here

[PaolinaSparks]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Hi fanaticgames,

i had the same error.
Please try to block only the CKV lines without the STVP line. So the pins 12-19 on the left cable(CN1801). You have to work very precisely, preferably with a microscope. Do not block any pins on the right cable. Connect both cables and test if there is a picture.

If there is no picture, you block the CKV lines without STVP on the right cable. So the pins 76-83 on the right cable(CN1802). Don't block anything on the left cable. Reconnect both cables and test. If an image comes up in one of the two attempts, we'll see what's next.

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

CN1802_UT (USI-T RIGHT) and CN1801_UT (USI-T LEFT)

The pinout is clear, first I covered exactly the ckv area, first right and then left but nothing has changed

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

blue color

ok, I understand, I'll try like this then, leaving the other flat free

[lotas]

Re: Samsung UE55MU6120K Boot loop with backlight no video

CN1802_UT (USI-T RIGHT) and CN1801_UT (USI-T LEFT)

[Diah]

Re: Samsung UE55MU6120K Boot loop with backlight no video

blue color

[lotas]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Sometimes it helps in some situations to reduce the VGH voltage to the panel and the reboot stops.

[Diah]

Re: Samsung UE55MU6120K Boot loop with backlight no video

you mean in this area?

NO
i linked before lotas photo... its for LVDS which are on the top of MB... and as lotas remarked... i give you other remark to count from the top 11 pins and start masking.

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...

you mean in this area?

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...

I have already covered the pins that lotas told me, can you name other pins other than his? honestly I don't think much will change since the TV keeps restarting with 2 connected flats

[Diah]

Re: Samsung UE55MU6120K Boot loop with backlight no video

mask only the LVDS on the top of MB.... from Top count 11 pins and mask 9 pins.. it can be too from top start from 10 or 9 try you will have working TV at least but not perfect

by the way we have in forum digram where to mask on NU... MU will be same way just 1.2 more or less...

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Remove the jumper and test without it. Isolated should be only on one half, on the one that does not work.
And you need to put adhesive tape on the other side where the contacts are on the cable.

The
jumper has already been removed, the wire is broken, and I tested it by covering one flat at a time

obvious that the tape is also on the side of the pins

[lotas]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Remove the jumper and test without it. Isolated should be only on one half, on the one that does not work.
And you need to put adhesive tape on the other side where the contacts are on the cable.

[fanaticgames]

Re: Samsung UE55MU6120K Boot loop with backlight no video

Here I give you a photo of each half (left and right cable) where to isolate the CKV. Maybe it will be easier for you.

I put scotch tape on both flats and the result is that it restarts anyway, tried to put first on one, then on the other and then on both, when the flats are connected the TV restarts

I positioned the tape counting pin by pin with the microscope so there is no error, covered the pins from 12 to 20 and then from 75 to 83

[Diah]

Re: Samsung UE55MU6120K Boot loop with backlight no video

lotas photo this is the cKV usual get issue at NU/MU/TU.
ESD you cant test them with DMM. only if you have Laser Temp pointer you will find one of them more warm to hot than other.