Panasonic TX48CX400B TV Issue: No Backlight, Blinking Stand LED, T-Con & Power Supply Tested

Hello, I am asking for help in identifying the fault, the TV, after connecting, behaves as follows: the red stand LED blinks, then there is a single flash of the backlight and a black screen. t-con and the power supply board checked and working, I will add that after re-twisting the image appeared for a few seconds and went out. Could the main board be the cause? Please help. best regards

Saracen_ wrote:

Panasonic TX48CX400B

Panasonic you say ... probably only the logo on the front tell us what's inside and why our favorite Vestel company

rad.srat. wrote:

How is he supposed to know? It's a lamer.

Saracen_ wrote:

t-con and power supply board checked and working

GanCegall wrote:

Saracen_ wrote:
t-con and power supply board checked and working

And that's what proves it's a lamer.

rad.srat. wrote:

And that's what proves it's a lamer.

Who is looking for help on the forum? expert?

You would have to start with the substitution of T-con from Samsung.
Currently, damage to T-con> causes no backlight
* wide recent subject of Z.Skibiński

Quote:

t-con and PSU board checked

It remains to unscrew and check the "owtch" LED strips

_______________________________
This is a new Vestel chassis, with 4k matrix and 2D-3D
- Vestel barcode: 23265775, 17MB100, for Panasonic TX-40CX400B, TX40CX400B,
* on ebay.uk around GBP 160


PSU 17IPS20 barcode: 2325353 - 27380507,
* pcb: 071114R9
* price around GBP 40


No. the barcode varies according to the equipment of the model and thus the different batches.
___________________
Ver.48 "Vestel, chassis: 17MB100 / 23265775 for PANASONIC TX-48CX400B
* or 23271153
T-con: LJ94-34140A / 14Y-J1FU13TMGC4LV0-0 / from Samsung
Matrix: VES480QNSS-3D-U01



Here on ver. 48 "there are 6 strips with 11x LEDs (Right and Left (only has 5xLED)
480DLED_SLIM_A-LEFT-TYPE_REV07_20141219
Left side below

Hello.
Has my colleague been able to identify the fault?
I have identical symptoms in the Panasonic TX48CX400E. I replaced the power supply, I still have no backlight. The previous power supply had a clearly burned-in, discolored laminate around the LED driver.
Buddy Lisek, can you give us more information on the t-con from Samsung? Do you suggest first substitute the t-con and then start disassembling the screen to the LED strips?
I am asking for hints.

There is voltage on the LED socket. Come on for a while?

Yes, it does.

Check the led strips and if you have nothing to power them, check the diodes one by one.

I have damaged 3 diodes. Is it worth fixing it? Can the LEDs themselves be replaced or the entire strips?
By the way, the manufacturer somehow did not take care of heat dissipation from them.
Do you know what diodes are and with what power a single piece works?

update:
LEDs replaced, backlight is gone.
Perhaps at the start, some fell again, but I don't want to disassemble the matrix again.
Of course, I checked the strips after replacing the diodes.
I am thinking of bypassing the LED power supply on the board and permanently replacing it, for example, with a universal LED power supply, such as 60-120V 300mA from Allegro. The stripes should light up after all. What are the disadvantages of this solution apart from the lack of brightness regulation?
I mean, for example, such a power supply: https://goo.gl/qYzwbS

I will step on the topic. Tv TX48CX400B. After turning on the TV, the image is for about 15-20 seconds and then it disappears. Sound is on all the time. From your experience, what happens most often and results in such symptoms? Vestel 17IPS20 or rather 14Y-J1FU13TMGC4LV0-0 from Samsung? I know it's a tea-leaves reading, but your experience should determine the probability. I will add that after turning on the tv, the power supply squeaks a little and when the tv turns off after 20 seconds, it squeaks a little less / quieter ... otherwise. There is about 75V on the backlight output. Please help and understanding.

michal180183 wrote:

Tv TX48CX400B

There is no such model, let's start with this.

This model is and is from the UK because I have it.
I guess they had died, but in mine it was. You should be able to see the content even if the backlight is not working
Poor plastics supporting the screen at the right height from the LEDs, which I would not touch, it crumbles.

tezewiusz wrote:

This model is and is from the UK because I have it.

Yes, it is but labeled differently:

I would also like to connect to the topic I have a problem with the same model but ended with the letter E. The MP3394 chip was damaged in the power supply, the LED driver after replacing it with a new backlight returned, but for some time. It turns off by itself when, for example, playing movies from USB, the sound and image content is missing, interestingly, if I turn off the movie and enter the MENU, for example, IMAGE and leave it in this MENU, nothing happens even for several dozen minutes, the backlight is all the time.
Has anyone encountered such a case, I would be grateful for every hint

typeky wrote:

The MP3394 chip was damaged, the LED driver came back after replacing it with a new one, but for some time.

People, some logical thinking ... what is "behind" the LED driver?

So why after entering the menu the backlight does not go out

Hello, I have exactly the same as the celine on the old power supply, the picture was for about 30 seconds, then the backlight was falling, the voice was all the time. After installing a new power supply from Allegro after turning on the screen races blinking and that's it. After reconnecting the old power supply, the red LED does not flash. Anyone found a solution? Is it worth ordering t-con? Have you already cancel the repair?

Simonmanio wrote:

Have you already cancel the repair?

You call the replacement of plates repair good, return it to the site if you have no idea about it.

Lameers and trolls are thriving. So I will ask myself: There are no moldings in nature for this model. Before I take the matrix apart, I prefer to buy new ones, so that I do not have to deal with the dilapidated equipment too long. Tell me what the slats are, how many and whether they fit something else? Are these 6 x11LED / 3V strips in two blocks? -because there are other versions. My matrix is VES480QNSS.

Well, I will also step on the topic. VES480QNSS-3D-U01 panel, where you can get a complete backlight for this crap? It's a pity to have fun with the replacement of individual LEDs because sooner or later the customer will return with a complaint and the robot for free again.

Kpl. kosztuje 50-60 funów (Lewe i Prawe)

*from Tx-48Cx350B 48" with matrix: Ves480Qnss-3D-U01 /480Dled_Slim
480Dled_Slim_A- Left -Type_Rev07_20141219
480DLED_SLIM_A-RIGHT-TYPE_REV07_20141219
*za Link

Well, only that these are rather used strips. I searched the internet and nowhere do I see new ones, even on the slant-eyed ones.

Hello. I would like to ask how many v LEDs have in this backlight?

Indyczes wrote:

I've searched the internet and can't see new ones anywhere

Nima Sir, Like in the times of the People's Republic of Poland we are also looking for new ones for a long time.

I mean, I understand that there are no new ones, also, unfortunately, I had a zero search result. And maybe you know what LEDs are there?

Dawidex310 wrote:

what diodes are there

LED lights

Ten kpl. na (ali) Link
* lub Link

Quote:

(A) RIGHT X4 480DLEDSLIM RIGHT-TYPE
(A) LEFT X 4 480DLEDSLIM LEFT-TYPE
(B) RIGHT X2 480DLEDSLIM RIGHT-TYPE
(B) LEFT X2 480DLEDSLIM LEFT-TYPE
BACK LIGHT LED STRIP FOR :
TX-48CX350B
TX-48CX400E
TX-48CX400B
48S3653DB
48U7653DB
matrix VES480QNSS-3D-U01

Model PANASONIC TX-48CX400E (na VES480QNSS-3D-U01,) to
- 1x6LED,538mm+1x5LED,391mm