Sony OLED XR-77A80J - Initially dead, now 4 Flashes

[thstuff]

A) TV initially dead
B) On a hunch of a locked up Google OS, plugged in a USB memory stick with latest FW and plugged it in. It booted into the update screen, completed the update and restarted to Home screen.
C) Was able to perform a Reset from Settings menu and completed out of box configuration.
D) Ran a 4K screen saver demo for about 6 hours, then turned it off for the day. Did not notice any stripes, dead zones or other artifacts in the image.
E) Powered back on and it now runs for a few minutes before relay clicks, screen goes blank, Main Board Red Digital Optical LED goes off, and Red Smart Core LED blinks 4 times forever. Can turn on one more time with remote and it will run for a minute before relay clicks and screen goes dark again.

After reviewing other XR-77A80J topics, checked all connections, then performed the following Diah driven tests:
1) Unplugged cables from power supply at CN6401 and CN6601
2) Powered ON and measured 3.5V @ CN6401 Pin 6 STBY
3) Jumper CN6401 Pin 6 STBY to Pin 5 POWER_ON, relay did NOT click.
4) Added jumper from CN6401 Pin 6 STBY to Pin 1 TCON_12_ON, confirmed 12.3V present on CN6401 Pins 14-20 and CN6601 Pins 1-2
5) Added jumper from CN6401 Pin 6 STBY to Pin 3 EVVD_ON, heard relay click, and confirmed 21.6V present on CN6601 Pins 19-30
6) Powered OFF
7) Reconnect cable to power supply CN6601, unplug 2 LVDS cables from right edge of T-CON
8) Left three CN6401 jumpers in place, powered ON, heard relay click, and observed NO light, flashes, or test pattern on screen. T-Con was warm and there were no hot spots around perimeter of screen.
9) Thought power sequencing might be an issue, so powered OFF, removed CN6401 jumpers, powered ON, jumpered Pin 6 STBY to Pin 5 POWER_ON, then Pin 1 TCON_12_ON, then Pin 3 EVVD_ON and relay clicked, but still no test pattern on screen.
10) Power down, reconnect CN6401 and 2 LVDS cables, power up and back behavior described in E) above.

Does this indicate a bad panel or is there some other setting required to produce the T-CON test pattern?

Thanks!

[Diah]

remove all Jumpers you did early,,, all Kabel should be in place as it should..
only disconnect the 21V EVDD socket between PSU and T-CON , turn on yours TV should turn on with black screen... your sign the optic port lit red and remain on.

leave it for period of time..... plug it out from wall only

keep evdd disconnected.., do hard reset by pressing the joystick and pull it down as you at this position plug it in wall remove the pressing only after the front LED indicator change from white to green...

it will reboot 2-3 time leave it for long time and you can hear the first install screen melody....... at this state and its on... plug in back the evdd socket... the screen will light up and hopefully remain on

[thstuff]

Diah, results...

"remove all Jumpers you did early,,, all Kabel should be in place as it should..
only disconnect the 21V EVDD socket between PSU and T-CON , turn on yours TV should turn on with black screen... your sign the optic port lit red and remain on."
-> TV did not turn on and no indicator lights
-> Waited many minutes then pressed TV power button one time, indicator flashed white one time then optic port lit Red and then indicator began to flash Red 5 times forever

"leave it for period of time..... plug it out from wall only"
-> Done

"keep evdd disconnected.., do hard reset by pressing the joystick and pull it down as you at this position plug it in wall remove the pressing only after the front LED indicator change from white to green..."
-> This TV only has a single MB power button, so held MB power button for up to 4 minutes and never saw white or red LED indicator.
-> Unplugged power, press and hold MB power button, connect power, release MB power button after 30 sec. One white indicator LED flash, then indicator flashes Red 5 times. (Probably panel power failure P_ID_ERR, right?)
-> With power still ON, connected PSU EVDD CN6601, press MB power button, TV boots to select language screen. Relay clicks and screen goes dark after about 30 sec, indicator back to 4 red flashes.
-> Press MB Power, wait for select language screen and quickly enter Self Diagnostic Function with remote buttons <Display>, <5>, <Vol ->, <Power> to capture attached photo: XR-77A08J Diagnostic Display.jpg


Note: This TCON board has an eMMC chip which explains why no test pattern was displayed during tests in Post #1.

[Diah]

the panel have one raw OLED cells .. you can see the vertical black line near the middle.
to keep watching this Sony ...yours option only disable the SOS pin between the T-CON and MB which it delivered via lower LVDS... you can find the pins easily... we do have here at Sony OLED how to

[thstuff]

Diah, you have eyes like an Eagle I am embarrassed to have missed this important panel problem A close up of the two dead pixel columns is attached.

1) Studying the interconnect shows MB CN6200 Pin 4 LD_ERR, but this connector is not stuffed.
2) Lower MB LVDS CN6800 does not have a signal labeled LD_ERR, but Pin 40 is GND/ErrorDet and it goes thru a 0 Ohm SMD near the connector. Removing the 0 Ohm SMD will leave this MB input floating.

[thstuff]

Put tape on flex to Lower LVDS MB CN6800 Pin 40 GND/ErrorDet. powered On, white LED flashes followed by 4 red flash. The relay does not click at all...
Must GND/ErrorDet line on MB side be tied to 3.3V or GND when Pin 40 is taped open?

[lotas]

There are no errors - low level (GND), There is an error - high level (3.3V).

[Diah]

Diah, you have eyes like an Eagle I am embarrassed to have missed this important panel problem A close up of the two dead pixel columns is attached.

1) Studying the interconnect shows MB CN6200 Pin 4 LD_ERR, but this connector is not stuffed.
2) Lower MB LVDS CN6800 does not have a signal labeled LD_ERR, but Pin 40 is GND/ErrorDet and it goes thru a 0 Ohm SMD near the connector. Removing the 0 Ohm SMD will leave this MB input floating.

the 2 line are the issue which t-con send the sos signal to shutting down.. as perviouse post i wrote the option of blocking the signal on T-CON side only..
the second option you have are dirty work... you need to cut the metal cover at the area you have the lines to have access to COF use tapping to see if the line went out.... or you may have shorted caps too
search here OLED thready there are many successful work.

also upload high resolution focused photo of yours T-CON with out any heat sink.

[thstuff]

Just to confirm, if Lower LVDS MB CN6800 Pin 40 GND/ErrorDet is taped, a wire must be added to MB from GND/ErrorDet to GND.

[Diah]

with yours configuration to trick MB no error there,,
i am talking to trick the T-CON that the panel no error had.... 2 different shoes

[thstuff]

So the only way to trick the TCON is to fix COF?

TCON Photos as requested...

[Diah]

which screen zise this OLED ???

follow the rail ERROR DETECTED ON sign at t-con

[thstuff]

Panel is 77"

[Diah]

Panel is 77"

strange at OLED world 77 and just 2 ribbon to panel.. however the pin 40 you were talking on ... i think it response to R76 or R77 on t-con ... if it was 4 ribbon then i do know.

[thstuff]

When I put tape on Lower LVDS MB CN6800 Pin 40 the screen did not come on and TV went directly to 4 red flash error. Is the normal of should the screen come on?

[Diah]

When I put tape on Lower LVDS MB CN6800 Pin 40 the screen did not come on and TV went directly to 4 red flash error. Is the normal of should the screen come on?

i don't know what pins you are referring too... is this 40?

[thstuff]

Yes, MB CN6800 Pin 40 = TCON CN5 Pin 12

[thstuff]

TCON CN5 Pin 12 = ERROR_DETECTION

[Diah]

TCON CN5 Pin 12 = ERROR_DETECTION

i don't think yours pins calculating are correct , for me not PIN 12 maybe 7 or 8...
heck the points with R i mentioned before then with ribbon socket which it go to panel
c

[cheebster]

Any success on this ?