I picked up this TV from CL. The TV had been opened, and I was told the Sony Techs diagnosed it as needing a main board which they couldn't find. I got it home, when I first powered it on, the words BRAVIA flashes for a second and the backlights stay on for 20 seconds, but no video or OSD. The backlights then turned off. All this time, the green LED in the front stays lit. If you hit the power button again it turned off, and iif you hit again, then it turns on, except, this time there is no "BRAVIA". Just a blank screen with backlight behind it. I got rid of the old main board and bought a new main board (yes I know it really is the main board, part number A-1728-743-A). With this board in place, now all the same behaviour repeats, except, now there is no BRAVIA that flashes either. Just a lit screen initially, followed by the BL turning off followed by nothing. If u try to turn on again, no BL this time, and green LED stays lit. The voltages from the PSU are all correct, 12Vunreg, 12V reg and 15V. I measured the voltages on some of the connectors, and in particular noticed that when the BL shuts down and the TV goes into a "coma" the inverter_err pin gets set to 1.9V (normal=0). At this point I do not know what the hell is wrong with this TV. If anyone has any experience with this set please help out. I have attached a picture of the boards.
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Re: Sony KDL-40XBR9 green led no video or audio
Picture attached. Had to resize.Attached Files -
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Re: Sony KDL-40XBR9 green led no video or audio
Here is the service manual:
It is strange that you do not get any error codes either.Last edited by budm; 03-31-2014, 10:28 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Sony KDL-40XBR9 green led no video or audio
I did download the service manual, but that didn't seem to have any useful information about this problem, primarily because it doesn't throw any error codes.Comment
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Good Day.
I just replaced tcon on my sony kdl 65xg9505 and getting green amber leds blinking. all voltages are ok according to working sequence.
i downloaded firmware from sony and there is no .pkg fike.. after extracting it gives another file which contains multiple files like inf, payload.bin and 3, 4 other files. i just did that usb but did not worked. anyone knows anything how to do it..?
green amber blinking stops after while and then starts again. tv responds to remote control on off etc. before installing new tcon backlite was coming on without backlite... -
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Hello,
i have this sony bravia kdl-43w755c which boot loops. After sony logo, it shows the android animation loading then it restarts…
from what i read online it looks to be an emmc issue…
i’m not familiar with this kind of tv repairs… i’m repairing laptops and gpu’s…
i took out the board and say an samsung 16gb emmc
i don’t have an exact replacement, but i have a few 32 and 64gb emms’s from laptops…
i could try to put one instead of the 16gb one, but will it work?
where do i get the software from?
any help will be much appreciated!...03-06-2024, 12:26 PM -
Hi everyone!
Could really use some of your knowledge with some pointers to where i should start looking at.
So, as soon as i plug the mains, i get the green power light. no blinks no nothing. solid green. trying to put it in stand by is a no go... completely unresponsive, both in button panel as in remote.
Seeing im very new to this, could some one try and help me fix the darn thing?
Thanks a lot. Didnt find any schematics for it....
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