Sony XBR-75X800G - Android start up only and dark blue screen

[NolesFan]

So I got the board back today and I wont to give the self test another go =since I got the new jumpers in and to be sure I was doing it right.
Disconnected harness between PS and MB.
Disconnected harness from MB to Tcon on Tcon side.
5 7 9 26 all connected.
Connect PS pin 28 to Tcon fuse.
Plugged power wire into wall and I heard the "click" went around to front of TV and nothing happened, screen stayed black. LED strips never came on.
Checked voltage at the 4 connected wires = 3.52
Checked voltage at fuse = 12.57

Am I doing something wrong or what does that tell you Diah? Thank you

[NolesFan]

Here are the phots you requested Diah. I hope they are good enough to see what youre looking for.

[Diah]

Here are the phots you requested Diah. I hope they are good enough to see what youre looking for.

thx. they are in good shape...

[nomoresonys]

Maybe check all the cables, just check for continuity meter probe on each end, like you would check any wire. Post a picture of the whole back of tv as to see all the boards and how they are connected, my "guess" is a powerboard issue IF all the cables check out ok. Did you have a good look at the under side of the powerboard, obvious blown component, bad solder, might suspect a marginal/bad capacitor, electrolytic caps usually fail first.

[NolesFan]

So I got the board back today and I wont to give the self test another go =since I got the new jumpers in and to be sure I was doing it right.
Disconnected harness between PS and MB.
Disconnected harness from MB to Tcon on Tcon side.
5 7 9 26 all connected.
Connect PS pin 28 to Tcon fuse.
Plugged power wire into wall and I heard the "click" went around to front of TV and nothing happened, screen stayed black. LED strips never came on.
Checked voltage at the 4 connected wires = 3.52
Checked voltage at fuse = 12.57

Am I doing something wrong or what does that tell you Diah? Thank you

Nomoresonys, ok Ill give it a try. No I have not looked at the back of the power board. I didnt think it was an issue after getting my readings correct ( finally ). Ill check that today along with looking at the back of the Tcon. But any idea with the above quote? I mean if it sounds how I have it hooked up is correct and Im not getting the screen test with any colors, does that mean the panel is bad and I should give up?

[nomoresonys]

Sorry I'm not exactly sure what it means when that test "fails" I'll defer to Diah for that.

[nomoresonys]

Guess there isnt much left but the tcon, if all cables and powerboard are good.

[nomoresonys]

And now at this point, I can turn the TV and it will show normal picture, work for a few hours then go dark blue. I can shut off the TV for a little while, turn it back on and its a normal picture again. Leave it on a few hours and itll go back to dark blue.

I'm not sure about this particular tv, but does this exact thing happen every time, on 3 hours then shuts off? I"m pretty sure there are some tvs that WILL shut down/off when there is no communication from the user after a while, like no clicks from the remote. Maybe the sleep timer is set?

[NolesFan]

I'm not sure about this particular tv, but does this exact thing happen every time, on 3 hours then shuts off? I"m pretty sure there are some tvs that WILL shut down/off when there is no communication from the user after a while, like no clicks from the remote.

Yes correct. Currently, with functional MB installed, when I turn it on the TV clicks, back lights come on, they run thru their lighting phase as what would show on screen ( mean bright dim bright etc ) but no picture. If I leave it like that, the TV shuts off ( guessing due to no source recognized ).

[nomoresonys]

Forgot what was tried but heres a couple things. Restart your TV by pressing the power button on the remote control until a message appears, the TV will restart. Simple reset, unplug tv from power hold power button on tv down for 30 seconds, wait a minute, plug back in and try it. Maybe try a firmware update if it isnt on the latest.

[nomoresonys]

Yes correct. Currently, with functional MB installed, when I turn it on the TV clicks, back lights come on, they run thru their lighting phase as what would show on screen ( mean bright dim bright etc ) but no picture. If I leave it like that, the TV shuts off ( guessing due to no source recognized ).

Interesting, try the first 2 things in post above.

[nomoresonys]

If no joy on those 2, try
a force factory data reset, unplug the AC

power cord. Press and hold both power and –

buttons on the TV, then plug in the AC power

cord. Release both buttons when the

illumination LED blinks in green

[nomoresonys]

I suppose some of those tests might not work if you have no display.

[NolesFan]

Forgot what was tried but heres a couple things. Restart your TV by pressing the power button on the remote control until a message appears, the TV will restart. Simple reset, unplug tv from power hold power button on tv down for 30 seconds, wait a minute, plug back in and try it. Maybe try a firmware update if it isnt on the latest.

Well the screen shows me nothing ( meaning cant see any message appear ) but I did hold down the remote power, tv shut off and rebooted, LED lights cycled, but no display.
Tried the unplug and hold manual button down for 30 seconds and plugged back in, and LED lights cycled but no display.
Tried a hard reset with the power and down buttons held, green lights faded in and out on little light below the TV, then let go, little light went to white, LED lights cycled, but no display.

[NolesFan]

Oh and Nicks did send me a USB drive bac with my MB but no information with it. When I plugged into my computers and I checked the file name it was " upgrade_loader.pkg " I dont have a program on my computer to open it, but figure its something for the TV. I was going to call them today and ask about it. Bad thing is though, if its some kind of firmware updater or something, without being able to see anything on screen, I wont be able to do anything with it.

[nomoresonys]

Do you have the original remote for this tv?

[nomoresonys]

Well the screen shows me nothing ( meaning cant see any message appear ) but I did hold down the remote power, tv shut off and rebooted, LED lights cycled, but no display.
Tried the unplug and hold manual button down for 30 seconds and plugged back in, and LED lights cycled but no display.
Tried a hard reset with the power and down buttons held, green lights faded in and out on little light below the TV, then let go, little light went to white, LED lights cycled, but no display.

.

[NolesFan]

just called Nicks, they said the USB was for pairing the MB back to this TV, so they sent me instructions on how to do and will perform that now.

yes original remote

[nomoresonys]

Oh and Nicks did send me a USB drive bac with my MB but no information with it. When I plugged into my computers and I checked the file name it was " upgrade_loader.pkg " I dont have a program on my computer to open it, but figure its something for the TV. I was going to call them today and ask about it. Bad thing is though, if its some kind of firmware updater or something, without being able to see anything on screen, I wont be able to do anything with it.

I believe thats the firmware update.

[Diah]

remove the speaker and let see the panel buffer boards.. on each side you have at the middle U ribbon... try disconnect one a time and turn on the TV with signal to wake up the Soc GPU