Sony KD-55X8000C - No picture, shows Sony Logo but blue screen after

[jbaranas]

Hello Everyone!

i am having trouble with my TV, my friend gave it to me and he told me he got it from somewhere so that is why I did not know the history of it.

When turning on, it shows Sony Logo, then solid blue screen after. Then nothing just stay that way.

I bought Main Board from ebay then T-Con from Aliexpress. Replaced Main board, the TV improved it is like booting up to dashboard, then I put on my chromecast and I try to play youtube videos with it but no picture. I then try remove LDVS from old t-con, then it asks for update showing green and orange LED lights, I reconnect old T-con again then I updated it using firmware I found online. After updating successfully, it only shows Logo then Blue screen again. I replaced T-con from aliexpress then same I updated it, then still blue screen. I tried Hard Reset using Power+Vol down, I do not see any pictures but I can definitely hear sounds like a playstation sounds or something maybe Setup sound(same sound when waiting for an update). I do not have remote controller so I could not verify if it is on the setup.

i know T-con is probably the issue, but can you guys help me what other issues can you think of?

thank you!

[tom66]

I think it's unlikely that if you get the Sony screen that it is a T-con fault. Does the TV switch abruptly between the logo and the blue screen or is there a delay?

[jbaranas]

I think it's unlikely that if you get the Sony screen that it is a T-con fault. Does the TV switch abruptly between the logo and the blue screen or is there a delay?

Yes, abruptly after logo then blue screen, then I tried universal remote, I confirmed that I can control the setup for first time. I can hear sound moving when clicking up or down button.

[tom66]

I suspect this is not a T-con fault but an issue with the main board then. It sounds like the 'smart' application isn't starting correctly for whatever reason, possibly corrupted firmware. If there's a way to load firmware onto the TV using USB, that can be done "blind", I'd recommend trying that first.

[jbaranas]

I suspect this is not a T-con fault but an issue with the main board then. It sounds like the 'smart' application isn't starting correctly for whatever reason, possibly corrupted firmware. If there's a way to load firmware onto the TV using USB, that can be done "blind", I'd recommend trying that first.

thanks tom66,

I am not sure if the firmware is corrupted but when I load it while changing main board or t-con, it successfully installed.

what currently happening is when I open my tv, it shows Sony Logo, then abruptly blue screen, darker blue then blue screen. Then it sounds like a playstation sound(probably the setup page, i can hear sound while using arrow buttons).

then one time around yesterday, I had some kind of a problem, diagnostic test patterns showing different colors and lines, then found out it was the LDVS not connected properly.

I do not know if the test patterns means the T-con is working properly, because it sends test patterns through the display panel when it does not receive proper data from the main board. But after replacing LDVS, now it just shows blue screen, darker blue, then blue screen.

i hope its just the firmware which is corrupted. And also, the seller notes that the main board is from brand new TV broken screen while transporting. And I think so too, i checked and its very clean.

thank you!