Re: Sony Bravia 65x900F BL On but not picture
Fixed! Replaced with new T-CON and TV is alive again.
Thanks again!
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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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...
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Re: Sony Bravia 65x900F BL On but not picture
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!...
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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!!...
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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?
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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...
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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?...
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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
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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?
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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...Last edited by lmcancu; 11-02-2023, 12:08 PM.
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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
[url]https://www.youtube.com/watch?v=4afrEbS5mZw[/url]
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?Re: Sony Bravia 65x900F BL On but no... /> <br /> I...Last edited by lmcancu; 11-02-2023, 11:12 AM.
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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?
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Re: Sony Bravia 65x900F BL On but not picture
Should I use a 1k resistor instead of a straight jumper to test?...
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Re: Sony Bravia 65x900F BL On but not picture
I was watching Nick's TV on YouTube and to determine if the main board was faulty, he disconnected it and then put jumpers between 3.3v STBY and Power on, and between tcon on and BL on. He then showed that the TV was doing a color pattern test and that indicated tcon, etc was good. Is this the right approach?
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Re: Sony Bravia 65x900F BL On but not picture
Backlight is on but no picture with or without LVDS cables connected. I get just a blue screen as shown in the one of the pictures I posted...
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Re: Sony Bravia 65x900F BL On but not picture
This fuse correct? I measured 12v on each side. And the LVDS cables are the 2 cables attached to the top right? Do I leave the third connector to the right connected as well? And how do you recommend I feed 12V from the power supply to the fuse? and which side of the fuse? Where do I get the 12v from the powe supply? I guess its from the third connector to the right?
update: I removed the 2 LVDS cables, and just verified the voltage on each side of the fuse. It was 12.65v. I don't understand how feeding 12v...
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Re: Sony Bravia 65x900F BL On but not picture
yes. The spa music after I did the factory reset...
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Re: Sony Bravia 65x900F BL On but not picture
Screen is very faint blue. I saw half the screen when the issue first appeared, after I powered off/on, I no longer had any picture just the backlight. The screen just shows a faint bluish color with the start up musinc playing.
I also tried removing the ribbon cables one at a time to see if I would get back half a screen, but no picture just the blue from the backlight...
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Re: Sony Bravia 65x900F BL On but not picture
It was a Sharp divide I think, when I first came back from the washroom, I could only see half of the youtube screen. But then it seemed like youtube was then fully only on half the screen, but I am unsure. The measurements from the connectors on the power supply board are:
12v(LD): 12.6v
NC
GL_Ctrl: 1.6V
SENSE_GND: 3.3V
VLED_GND: 2.2mv
VLED_GND: 2.2mv
VLED_GND: 2.2mv
VLED_GND: 2.2mv
NC
VLED_VCC: 38.3v
VLED_VCC: 38.3v
VLED_VCC: 38.3v
VLED_VCC: 38.3v...Last edited by lmcancu; 10-30-2023, 08:29 PM.
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Sony Bravia 65x900F BL On but not picture
I was watching youtube yesterday, when I paused it to go to the washroom. When I came back, the right side of the screen was showing half of the youtube channel and the left was black. I powered off/on the unit with the remote and now I have no picture whatsoever except for the bluish backlight. I did the factory reset (power + vol down), and now I when I power on I get the startup music, backlight but no picture.
I took the back cover off, and reseated all cables but unfortunately same issue. I took some voltage measurements on the main 2 headers from the power supply board and...
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