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

[nomoresonys]

Of course not nomoresonys, dont like giving up, but when its an avenue that I dont travel much and I dont understand things or words. By nature I like to try to fix everything before i throw it away, but my skill level in electronics of this nature is not very high. Ill try to run the updates and all that and see if that helps. I was actually going to try a new Tcon board also just to see. Right now, there is no change in the screen if i unplug the Tcon or leave it plugged in with the ribbon cable coming from the MB.

In the video I linked, he has no picture so this is possibly your issue, its easy enuf to test just as he does, if the vgh is missing it IS panel problem, a new tcon will not fix that issue.

[Diah]

Sorry Diah, I assumed by the statement since I was having trouble getting the plate off ( small things ) and the doubt about the standalone test and then with the final seek help before i cause damage, I figured you were doubting me and wanted to give up. I doubt my skills haha thats why Im here. i was able to figure out how to remove that panel, after the screws removed there were 3 of 4 black things holding it in place that needed to be pushed in so the panel could be lifted and slid back. I could see the panels and all the u shaped ribbons running to the panel itself.

good you did it... disconnect the U ribbon and check the screen if you could find any white color par or image.... if nothings on both U ribbon disconnected..... try the easy way run firmware..... or hard reset.... or at end replace T-CON

[nomoresonys]

Of course not nomoresonys, dont like giving up, but when its an avenue that I dont travel much and I dont understand things or words. By nature I like to try to fix everything before i throw it away, but my skill level in electronics of this nature is not very high. Ill try to run the updates and all that and see if that helps. I was actually going to try a new Tcon board also just to see. Right now, there is no change in the screen if i unplug the Tcon or leave it plugged in with the ribbon cable coming from the MB.

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[nomoresonys]

Yeah, what the hell just try a new tcon.

[NolesFan]

In the video I linked, he has no picture so this is possibly your issue, its easy enuf to test just as he does, if the vgh is missing it IS panel problem, a new tcon will not fix that issue.

For the life of me I cant find anything labeled VGH. Ive tested what ever I can find that has a V and so far so good on the readings though. I keep looking for it though since you said if there is no VGH then its the panel, might as well till I try a new Tcon

[NolesFan]

So ok, I was able to watch a few other videos and saw where its also called VONE and VOFFE. I have found VONE on my Tcon, but it doesnt read anything ( 0.01v ). I tried the ribbons to see if I get half a screen, and no i dont and the voltage stays at 0.

[nomoresonys]

You checked it with one ribbon cable at a time connected correct? hmm, that might be a good thing, maybe just the tcon is bad and the panel isnt shorted?

[nomoresonys]

I guess you could try the taping in the video, just for fun and curiosity.

[nomoresonys]

A few other names for vgh are vgon,von,dvdg. 25-30 volts.

[nomoresonys]

For vgl its voff, veeg, vgoff -7 to -9. Another voltage to check is vdd also known as v logic, dvd 3.3 volts. Another is avdd also known as vdda, vda 12-18 volts.

[NolesFan]

You checked it with one ribbon cable at a time connected correct? hmm, that might be a good thing, maybe just the tcon is bad and the panel isnt shorted?

Yes that is correct.

[NolesFan]

I guess you could try the taping in the video, just for fun and curiosity.

I thought for this you needed to have at least one of the reading in the mid 20v ? If not, yes I will def try it, cant hurt at this point.

[NolesFan]

Thanks for all the abbrevs to look for. I took several photos so I could zoom in and what the hell everything is saying. Ill see what I can find. Hopefully get some answers.

[NolesFan]

I guess you could try the taping in the video, just for fun and curiosity.

I got a good working Tcon and was getting different readings compared to the original, and still no picture I did try the tape in several places but nothing. Everything is still the same with no pic just sound. I guess the panel went to ghost. I wish I knew more because in those videos you sent, they get very detailed in what to do, I just dont have the knowledge to know what everything is to read, or what it should or not show. Appreciate all the help.

[nomoresonys]

Can you show a detailed picture of both tcons?

[NolesFan]

Let me know if not good enough.

[nomoresonys]

Ok, so with new tcon, try same test as post #126, remember vone IS vgh, see what it is with both ribbons connected, if it isn't optimal check again with one cable at a time connected.

[CapLeaker]

what you need to do first is to check the LVDS with an oscilloscope and flick around the menus while watching each pair when it blue screens. If the LVDS pairs aren't changing while flicking around, the problem is the main board.

[lotas]

what you need to do first is to check the LVDS with an oscilloscope and flick around the menus while watching each pair when it blue screens. If the LVDS pairs aren't changing while flicking around, the problem is the main board.

V-by-One HS is an electrical digital signaling standard that can run at faster speeds over inexpensive twisted-pair copper cables than Low-voltage differential signaling, or LVDS.
Here you need a cool oscilloscope to see something.

[CapLeaker]

V-by-One HS is an electrical digital signaling standard that can run at faster speeds over inexpensive twisted-pair copper cables than Low-voltage differential signaling, or LVDS.
Here you need a cool oscilloscope to see something.

Signal is signal, lotas... o.k. maybe a standard low end oscilloscope doesn't cut it, but the same principal remains. At the end of the day it always boils down to having the right equipment to do the job. Very good observation from your side and shows you paid attention!