Sony OLED XBR65A8G no video, PSU problem?

[lotas]

don't forget the panel auto test method

This is not a simple T-CON (LG), and you can't just put it into standalone mode.

[Davi.p]

don't forget the panel auto test method

[cheebster]

Oh well, got some progress here, cutted the metal plate so i could see the caps just a bit lower where the 4 lvds cables go from tcon to the panel, and found a shorted cap! Removed it, and tv doesnt blink anymore but no display, but ive got a butchered lvds cable from main to tcon. Gonna order a cable and see if it fixes this one!

[Davi.p]

point 1 and 2, you have not understood, but, you tcon model is different from the one of Cheebster, i think one of you must leave the thread, too much confusion here!

[thetomma]

only the lower LVDS which transport the SOS fault at module to MB
you can read the print at pins of error_xxxxxxx

How to read it, by connecting jack->usb you mentioned in that post?

[thetomma]

1) have you checked or not to witch line the shorted caps belongs to?
2) with this evdd disconnected have you checked the basis supply lines if are present or shut down? Are you able to find and check them?
3) you cannot inject svdd line alone from what i remember, this is dangerous for the cof, you need first to supply the vcc line, that is 3,3v i think

1. I checked i think all caps on tcon, none seems to be shorted, also fuses seems to be ok.
2. I havent checked power supply lines yet, you mean measure voltage on lines from power source board to tcon when tcon is connected to evdd and whe in disconnected?
3. Thanks for warning, by the way evdd is the same as svdd?

By the way on old tcon i found PCB in that area has a bit different color, it looks like it was high temperature there or some liquid:

[Davi.p]

1) have you checked or not to witch line the shorted caps belongs to?
2) with this evdd disconnected have you checked the basis supply lines if are present or shut down? Are you able to find and check them?
3) you cannot inject svdd line alone from what i remember, this is dangerous for the cof, you need first to supply the vcc line, that is 3,3v i think

[Diah]

Also im not sure that is important, when everything is connected, apart one of two ribbons from main-board to tcon board, then tv tried to boot with sound, kinda strange

only the lower LVDS which transport the SOS fault at module to MB
you can read the print at pins of error_xxxxxxx

[thetomma]

Also im not sure that is important, when everything is connected, apart one of two ribbons from main-board to tcon board, then tv tried to boot with sound, kinda strange

[thetomma]

with EVDD from power board to TCON disconnected - "new" TCON, it stops blinking 4 times and i hear the android sounds, once tv boot. Does it mean definitely panel is shorted and the whole TV can be put to thrash only? Apart of selling single parts

[cheebster]

Ok. So might be an idea to cutout the panel's metal sheet at the bottom and reveal stuff under ? Or check with thermal camera/thermal injection on that line, see if i can see heat on the panel's metal sheet and cut more precisely where i see the heat ? Possible or not suggested ? This line is 12v/22v or so it seems ?

[Davi.p]

you have to check to wich supply line those caps are connected to, i guess is SVDD, in that case the short is most probably in another hide cap, not on the cofs

[cheebster]

From what i've tested tcon that isn't calibrated will still display a picture but not optimal on the lg oled panels, from my experience. So i've removed these caps and the line is still shorted. Guess that one is going to recycling.. Sad

[thetomma]

This is a good interference useful for the thread, so this means one of two things, MB needs SW compatibility with TCON, i think is not so, or the two tcon are both damaged as they behaves differently, if you had read my last post you already has the answer on what to do (at least for me).. bye..

I think i got your point, i just saw your post and it was just the first idea, that i got broken tcon from the person who sold me as working, so both can be broken. Although it was mentioned in auction as tested. TCON's seems to be the same' i'll check all details once i got home ie serial numbers etc,

[Davi.p]

This is a good interference useful for the thread, so this means one of two things, MB needs SW compatibility with TCON, i think is not so, or the two tcon are both damaged as they behaves differently, if you had read my last post you already has the answer on what to do (at least for me).. bye..

[thetomma]

Hello

I've recently bought broken kd-65a8g with no image issue. Apart of that i bought used tcon ; -). Yesterday i saw this thread but did not start measuring boards yet. TV boots on older tcon, i can hear adnroid sounds, no image, no backlight. Green spots appeares on 0.5-1 second in left and/or right corners once i press power on remote. Oh the new TCON i got only 4 red diode blinks. Any suggestions?

[Davi.p]

SVDD is Source voltage, the same as AVDD in many lcd tcon.. is around 15-17v
check again the 2 caps by disconnecting first the ribbon cables, some high capacity gives zero ohm at first touch of dmm

this discussion is nearly a trashcan, too much people possessing the same thread, also one with different issue.. i hate see this.. anyway my opinion is that most of the probabilities in all these oled discussions, is that there is a bad tcon, oleds are almost all from LG, LG has a.very.bad story of failing bga solder, i think this is a stereotype situation, the people gives the bad guy to a service shop, they say bad screen, they sells tcon as good, and all people are worry, i also suggested many times to get a tcon only if assured it comes from working tv / cracked panel.. i doubt people here undestand what i write.. bye..

[Diah]

doesn't matter the name all related to EVDD socket

[lotas]

Here is a better closeup picture of where these lines goes, to SVDD side of the Q6. What is SVDD ?

SVDD - supply voltage within 12 - 16v

[Diah]

they are related to EVDD

on the panel buffer boards 4 ribbon disconnected compare with ribbon 1. if they are different behavior lift one side of the cup carefully and check one by one.... if the short remain mean inside the panel,