Sony Bravia 65x900F BL On but not picture

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Fixed! Replaced with new T-CON and TV is alive again.
Thanks again!

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Question on the TCON part: The label on it says the following:
V40846J810M9V and LMY650FF01-A
I found a tcon board for sale with the part number:
V40846M9F04V0 and LMY650FF01-A

Are these the same boards except mine is the J version, and this one is the M version? Functionally they are the same but perhaps an improved version?

Seller indicates that they are all the same parts:

MANUFACTURER: Sony

PART NUMBER: LJ94-40846M

ALSO KNOWN AS:
40846M
LMY650FF01-A
E88441

TYPE: T-Con Board, LCD Controller, Control Board, CTRL Board, Timing Control

KNOWN MODELS:
Sony XBR-65X900F
Sony XBR65X900F

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

on the panel buffer boards, you will find on each side at the middle ribbon cable like letter U , called U ribbon,,, if you have this on the boards,,, need to disconnect only one side on each time and turn on after you put all cable of MB back in place as original..
if your screen stay as it before not image or white 3/4 screen... mean your T-CON bad

Hi Diah, screen stayed like before, only backlight on each side. So thank you for the diagnosis, and I will try to find a t-con board to replace this defective one.
Please see picture on my buffer board and the U-ribbon I disconnected.

Thanks again!

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Ok I see it I think! Those two white connectors hold the ribbon cables and the U shape is between those two connectors. Sorry for being dumb! I will check it tonight and let you know. And even if this is your last post, I really appreciate all your help!!

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Sorry, it was not that I didn't trust. It was more a question of where the U ribbon was. I was looking for the shape of the U and I coudldn't see it in the picture. I know that you have helped a lot of people in this forum, including me before, and I really appreciate your help!

How would I detach the ribbon?

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

I didn't take the metal off yet, but looked online for a video that had a picture of the buffer boards. I don't see any U ribbons in this picture. This is the left buffer board I think

are you always so in yours life??? dont have trust on yours self and other ??????

what are under his fucking hand in photo.... this is fucking u ribbon.... this is my last post.... sorry

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

I didn't take the metal off yet, but looked online for a video that had a picture of the buffer boards. I don't see any U ribbons in this picture. This is the left buffer board I think

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

yes under the metal, remove it after remove the speaker..
No, the U ribbon test in case you have them on panel boards more effective than one ribbon from t-con... because it will load the panel as 3/4 while the t-con ribbon disconnection will be 1/2

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

For my understanding, the buffer boards are under that metal shield below the t-con ribbon cables in the attached picture right? If I just disconnect one of the ribbon cables from the t-con board, would that do the same test?

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

on the panel buffer boards, you will find on each side at the middle ribbon cable like letter U , called U ribbon,,, if you have this on the boards,,, need to disconnect only one side on each time and turn on after you put all cable of MB back in place as original..
if your screen stay as it before not image or white 3/4 screen... mean your T-CON bad

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Ok thanks! That video was misleading. So I connected as you said and I could see no picture with a flash light. I then connected the BL_On to 3.3 (also Tcon-on, and Power on) with the LED board connected to the power board. I only see the backlight on and no picture. So you think it may be the buffer boards right? I will need to take the stand off and put the display flat on a table to remove the metal covering. I will do that tonight and upload the pictures

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

doesn't matter if u disconnected or not it will be out since u only connect STDBY 3.3 with power on, and also STBDY 3.3 with TCON ON

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

I need to disconnect LED driver board from Power supply board too?
Do I jumper STDBY 3.3 with power on, and also STBDY 3.3 with TCON ON?

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

led driver boards need to disconnect from the boards side to avoid any short... same to LVDS at t-con need from T-con side disconnected
u can ignore BL_ON... just use power on and T-CON on.... use torch light to inspect the pattern on screen

if there nothings... you need to show us the edge puffer boards of the panel left and right.... see if there are U ribbon installed at the middle of each side

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Yes I did exactly that. Main board was completely disconnected from all other boards. The LED driver and T-Con boards were connected to the Power Supply board.
Note to be exact: I jumpered pins 2 and 3 together (Power On and STDBY 3.3) from Header 1, and pins 1 and 13 together (BL ON and TCON_ON) from header 2.
Please see picture attached

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

main boards should be disconnected from T-CON and Power boards and LED driver boards

jumper put them in place then plug it in wall

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

I tried the jumper tests: I jumpered STBY 3.3 with Power ON, and BL ON with TCON ON as shown in this video
https://www.youtube.com/watch?v=4afrEbS5mZw

But instead of BL turning on when plug in the TV, I get the 3 Red LED Blinks on the LED driver board. Anyone knows what that means? Picuture of the LED driver board attached
Note, I jumpered the pins prior to plugging the power cord. Do I need to jumper them after the power is plugged in?

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

Ok thanks! So they way I understand it, is that the 3.3v STBY pin will turn the TV on when connected to the Power on pin. Once the TV is on, it will provide 3.3v to TCON on. Then jumpering that pin with the BL On provides 3.3V to the BL so that it can turn on?

[Diah]

Re: Sony Bravia 65x900F BL On but not picture

Should I use a 1k resistor instead of a straight jumper to test?

for people not sure or first time they do,,, will be recommend to use R 1K or less to avoid any damage if they missed with pins assignment.

[lmcancu]

Re: Sony Bravia 65x900F BL On but not picture

if this exactly true ,,, then t-con and panel and power boards are fine..... the rest MB

Should I use a 1k resistor instead of a straight jumper to test?